Hi all,
The motivation for this project started some time ago when I heard a Blackstar amp equipped with reverb. The reverb was generated by a Spin FV-1 DSP IC and I was very impressed with how good it sounded.
Some research followed including the good work by Ice 9 and others here. However I was not too keen to have to program an external EPROM and there didn't seem to be much out there in the way of a really simple diy implementation of a FV1. I started wondering how simple a basic pedal could be using the internal ROM programs with minimal extra circuitry.
So after quite an amount of digging around and prototyping, I came up with this design which is about as simple as a FV1 pedal could be. It was developed with the hope that it will inspire those who have built basic PT2399 pedals to have a go - it uses less components than a Rebote for much more functionality. The simplest incarnation offers hall reverb, tremolo, pitch shift and vibrato and sounds great!
It is also easy to build, using a perfboard rather than a custom pcb.
More constructional information to come!
(https://s7.postimg.org/pjc8hpm0n/Easy_Verb_1.jpg) (https://postimg.org/image/pjc8hpm0n/)
Very nice idea gcwills, I look forward to your postings. 8)
Welcome and me too I look forward to your posts.
Any good place to buy the chip?
brewing popcorn and awaiting updates!!!
Quote from: printer2 on July 04, 2017, 12:09:52 PM
Any good place to buy the chip?
If your in the UK or Europe then profusionplc is the place to buy the FV-1
In the USA It is Experimental Noize
beer n whiskey ready... ;)
QuoteIf your in the UK or Europe then profusionplc is the place to buy the FV-1
Banzai also has them.
Thanks for the interest in my FVerb.
Here is the schematic - click on it to enlarge
(https://s23.postimg.org/5d6fu4t9z/FV1_edit_SPDT.jpg) (https://postimg.org/image/5d6fu4t9z/)
As you can see it is a minimal implementation of a FV-1 with not much more than the FV-1 and a TL072 as input buffer and dry/wet mixer.
Some economies have also been taken with only two controls - one for the FV-1 which bridges the POT0 and POT1 inputs in a similar arrangement to the EHX Holy Stain. This allows for adjusting reverb decay, tremolo speed, pitch bend and vibrato with one control. The POT2 input is pulled high to maximise the tremolo and vibrato depth. The second control adjusts the amount of wet signal in the mix. Adjusting this control also adjusts the amount of tremolo and vibrato.
To keep things simple, a SPDT centre off switch is used to switch between the internal ROM programs. I initially used a BCD switch to select all 7 programs, but found that of these 7 programs the two reverb and two pitch modes are quite similar. Also I found that the two remaining chorus and flange modes can be approximated when the pitch mode is set close to unison to create a pretty lush chorus/vibrato mode which I preferred to the chorus or flange modes. This meant that a simple mini centre off toggle switch could be used to select between hall reverb, tremolo, pitch shift and vibrato/chorus. The toggle switch was also much easier to use in operation.
A simple buffered bypass is used which works well, simplifies wiring and uses a cheap SPST switch.
To come are some comments and photos of the pedal internals and on parts availability :)
Moving on to building the FVerb.
Perhaps one reason that the FV-1 is not used in diy as much as say a PT2399 is that it is housed in a 28 pin SMD package which is difficult to use in a conventional through hole perf or vero board.
To get around this, I used a pcb adapter which converts the SOIC package to a conventional 28 pin DIL arrangement. The FV-1 can be soldered fairly easily to the adapter with a fine soldering tip and if you happen to bridge adjacent pins during soldering, the excess solder can be removed with solder wick.
Here is a photo of the adapter pcb - AU$1 including post from ebay ;D
(https://s10.postimg.org/7baavtkj9/SSop28.jpg) (https://postimg.org/image/7baavtkj9/)
By the way, thanks to Ice-9 and MetalGuy for the heads up on sourcing the FV-1 - you can also buy them from Aliexpress.
For U.S. builders, I have the chip, with or without the crystal:
http://smallbear-electronics.mybigcommerce.com/spin-semi-fv-1-with-crystal/
http://smallbear-electronics.mybigcommerce.com/ic-spin-semi-fv-1/
SOIC-To-DIP adapters are here:
http://smallbear-electronics.mybigcommerce.com/soic-to-dip-adapters/
I would be interested in seeing this built in a Bare Box#1
http://smallbear-electronics.mybigcommerce.com/the-bare-box-1/
preferably with a rotary encoder for the program switching. Maybe this one:
http://smallbear-electronics.mybigcommerce.com/rotary-encoder/
It's Alpha RE111F-41B3-15K-20P
I'm intrested. Got any demo's ?
Rich, it is difficult to list, in complete fashion, the number of pedals that use the FV-1 for reverb.
A quick peek at the datasheet/appnote for the FV-1 shows the many ways that the basic FVerb circuit could be appended to, in order to provide varying degrees of additional control. For instance a single toggle and one additional pot would add more effects and control over an additional parameter.
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It's interesting to look at the codes =)
Ok I'm gonna be cheeky and ask for the more involved version please.
I'm still not certain if it would need just an ordinary multi pole switch or an "encoded" switch.
Or much about it at all.
I've only ever done one FV1 build. Slackers awesome reverb. It has an eprom and a series or pots.
I have no wish to start programing yet.
That's why I liked the idea. It would be a shame to miss out on half the functionality of the chip by omitting a few switchs and pots maybe.
What is it going to take to access the other effects and parameters ?
Look at the datasheet. There are three program-select pins, that can be controlled via a dipswitch or a couple of SPST toggles. A rotary encoder is slicker, but is not essential unless one is pressed for panel space. A DPDT centre-on type toggle could also provide 3 settings as a sort of compromise.
As shown in the schematic here (and thanks for that, BTW), one pot input is tied to 3V3, and one pot is used to feed 0-3V3 to the other two pot pins. Just cut the line from the existing pot wiper to Pot 1, leave Pot 0 in place and install a second 50k pot whose wiper feed 0-3V3 to that pot pin.
I've read up a bit more. Thanks Mark.
Here is an internal shot of the completed FVerb:
(https://s22.postimg.org/5kpc7b65p/FVerb_2.jpg) (https://postimg.org/image/5kpc7b65p/)
After the FV-1 has been soldered to the DIP28 adapter board, the adapter board was mounted on a 24 by 12 hole perf board. The adapter board is fixed to the perf board by soldering a loop of wire through pins 1 and 2 through the perf board and soldered there. Similarly a loop is soldered through pins 12 and 13 and then another loop through pins 24 and 25. This fixes the adapter board firmly to the perf board and allows for the other connections to be made to the FV-1.
There is not a lot more to the board - the TL072 and a 3.3V voltage regulator. I have been too lazy to generate a perf board layout, but perhaps some kind soul here may oblige ::)
The FVerb was built into a standard 1590B with the two pots, mode switch and footswitch mounted on the front, the DC connector at the rear and input/output sockets at the side. I built the prototype initially with a 3 position DIP switch for program selection before the SPDT centre-off program selector switch was installed. This is not needed in a build.
I found that some care needs to be taken with grounding the controls and input and output sockets. I'll provide more details later, but suffice to say I was able to eliminate any extraneous noise with proper grounding.
More to come!
I'm in. So simple it almost calls for stacking two in a box with series/parallel option.
Here is the parts list for the FVerb:
1 X Spin FV-1 IC
1 X TL072 IC
1 X 78L33 voltage regulator
1 X 1N4001 diode
1 X 32.768 KHz watch crystal
Resistors: all 1/4W
1 X 100 ohm
4 X 1K
2 X 6K8
2 X 10K
2 X 22K
3 X 33K
3 X 100K
1 X 470K
2 X 50KB pots
Capacitors:
1 X 15pf ceramic
1 X 1nf 100V
3 X 10nf 100V
1 X 47nf 100V
2 X 220nf 100V
3 X 1uf 25V
1 X 10uf 25V
1 X 47uf 25V
SPST push button switch
SPDT centre off mini toggle switch
DC connector
1590B diecast box
2 X 1/4" sockets
28 pin SOIC to DIP adapter pcb
Most parts can be sourced from the normal suppliers with the exception of the Spin FV-1 IC.
Earlier in this thread are listed some sources for the FV-1. I purchased mine from Aliexpress.
The 32.768 watch crystal can be sourced from ebay - eg http://www.ebay.com.au/itm/5PCS-32-768-KHz-32768HZ-Tuning-Fork-Watch-Crystal-12-5PF-3mm-x-8mm-/301924837830?hash=item464c1f69c6:g:-F8AAOSwa-dWlgWv
I dont think a perf layout would be a problem. However I'd use header pins.
edit
Also why not add a 10k pot -series 33k instead of R8 then you will have control of the wet dry mix.
Do away with switch 1 2
Question.
Is C11 a smoothing cap for the crystal ?
The 15pf capacitor (C11) is to allow for reliable starting of the crystal oscillator associated with pins 9 and 10 of the FV-1.
commenting to subscribe
Quote from: gcwills on July 08, 2017, 10:44:12 PM
The 15pf capacitor (C11) is to allow for reliable starting of the crystal oscillator associated with pins 9 and 10 of the FV-1.
Oscillators from different sources sometimes have problems starting the oscillator with a 15p cap, I have found a 33p cap starts every oscillator I have used without problems. This issue has been talked about many times, one of the issues with an incorrect osc/cap combination can be a start up audio squeal or not starting at all.
For all oscillators check the datasheet for correct cap value.
Looks great, nice and simple, good work :)
Quote from: Kipper4 on July 06, 2017, 12:23:46 PM
That's why I liked the idea. It would be a shame to miss out on half the functionality of the chip by omitting a few switchs and pots maybe.
What is it going to take to access the other effects and parameters ?
Rich, on my reverb board if you ground pad "S3" that will select the internal programs so you can see what they sound like. For some of them you'll probably want the mix 100% wet as they already have the dry sound mixed in.
Interested, popcorn, etc. 8)
Quote from: tubegeek on July 09, 2017, 10:53:45 AMcommenting to subscribe
Just for everybody's FYI: I think the {
NOTIFY} button at the top of the page does that for you without fluffing the thread.
Quote from: PRR on July 09, 2017, 10:25:04 PM
Just for everybody's FYI: I think the {NOTIFY} button at the top of the page does that for you without fluffing the thread.
Yes and no. Notify gets you an email every time something is commented, but I don't remember if it makes it show up in the "replies to your posts."
Here are some soundclips of the FVerb.
Clips were recorded with a Strat on neck pickup through my Lamington Lite amp.
First clip is in hall reverb mode (mode switch position 2).
The first half of the clip was recorded with the reverb decay set to 50% and the last half set to 100%.
https://soundcloud.com/valve-heaven/fverb-reverb
Next is the the FVerb in chorus mode (mode switch position 1).
Chorus and Vibrato are selected by switching to pitch shift mode and by adjusting the pitch close to unison.
https://soundcloud.com/valve-heaven/fverb-chorus
Next is the FVerb in pitch shift mode (mode switch position 1) - some fun had with the pitch set down 4 semitones
https://soundcloud.com/valve-heaven/fverb-pitchshift
And last is the FVerb in tremolo mode (mode switch position 3) - first slower and then faster rate.
https://soundcloud.com/valve-heaven/fverb-tremolo
cool. does it do delay too?. 8)
if so what ms?
No delay Rob- I need to use your Abductor II delay for that :icon_wink:
ha ha, ok, cheers man.... 8)
The FV-1 is great for delays up to 1 second, but you'd have to program that into an external EEPROM and then you want knobs for time, feedback, level, which takes it out of the "simplest ever FV-1 pedal" zone.
An update on construction.
The perf board I used is a common 5cm X 7cm board readily available from Ebay - I bought 10 of them for AU$1.80 posted.
The perf board is a 24 X 18 hole not a 24 X 12 hole board as mentioned previously. This board fits easily in a 1590b diecast box.
I am currently attempting (very slowly!) a perf board layout for the FVerb and hope to post it here when it is done.
Construction of the FVerb is quite straightforward, however I noticed the prototype initially had some low level clock/digital hash in the output. This was due to the mix pot and input/output socket grounds being taken to a ground point near the FV-1. Moving the grounds directly to pin 4 (the ground pin) of the TL072 all but eliminated any noise. This made the FVerb a very quiet pedal indeed without any of the digital hash that can sometimes be experienced with the PT2399.
Looks like I won't get around to producing a perfboard layout for potential constructors :icon_sad:
Anyone here keen to pull one together?
Yeo
Quote from: gcwills on July 17, 2017, 01:43:34 AM
Looks like I won't get around to producing a perfboard layout for potential constructors :icon_sad:
Anyone here keen to pull one together?
What's the footprint measurement of the adapter. i.e. how many perf holes does it take in width and height ?
Quote from: DrAlx on July 18, 2017, 10:22:28 AM
Quote from: gcwills on July 17, 2017, 01:43:34 AM
Looks like I won't get around to producing a perfboard layout for potential constructors :icon_sad:
Anyone here keen to pull one together?
What's the footprint measurement of the adapter. i.e. how many perf holes does it take in width and height ?
A SOIC28 adapter will be 28 pin tall and 7 pins wide.
Thanks Mick. Did you mean 14 x 7
Luckily I have one on the bench.
I'd like a second pair of eyes to take a look at the following picture and see that I entered the schematic correctly.
https://1drv.ms/i/s!AvrH61utWEtEh1yQSwtRZmYb4btl
It is not the final layout.
It the the first stage of the layout process in my software (available here https://sourceforge.net/projects/veroroute/)
which involves doing a rough layout based on the schematic and graphically specifying the netlist.
If it all looks OK, then it's just a matter of shifting parts around. The software will autoroute and checks connectivity against the netlist.
I don't have a footprint editor at the moment, but I don't think it is needed in this case.
I might add a custom 14 x 7 footprint if I think it will allow a smaller layout.
BTW, the BOM on the first page should say 3x 220nF rather than 2 (C8, C12, C16).
If anyone want to download my software the ".vrt" file for the circuit can be downloaded from here ...
https://1drv.ms/u/s!AvrH61utWEtEh1v5UwNkIJCFMwn5
EDIT: I just spotted a mistake in my picture. Pins 1 and 2 of the FV-1 should be connected together. Have corrected it now and changed the images.
Here's the resulting perf layout. It's 18 x 22 although the pics are drawn with a perimeter of 1 perf-hole (so its drawn as 20 x 24).
Note that I have drawn the pots as trim pots. So you would just connect wires to those spots to offboard pots.
Same applies for the switches. I just drew two pads for the XTAL connections. I don't know how big those things are.
I assumed its possible to run jumpers under the converter board. If not then this layout is no good.
I emulated the converter by drawing on 28 pads surrounding the IC to give this.
https://1drv.ms/i/s!AvrH61utWEtEh2X9MNuLzoSliNrw
With the IC taken out showing just the converter pads, the layout is this.
https://1drv.ms/i/s!AvrH61utWEtEh2Qe8-pPcXkL2vhc
The vrt files are here: (You can do PCB mask, or vero layout, with just a couple of mouse clicks)
With IC: https://1drv.ms/u/s!AvrH61utWEtEh2NpcpiYYEvaKq-j
Without IC: https://1drv.ms/u/s!AvrH61utWEtEh2JCKR51VOx16bV-
Ordered my chip, slow boat from China but I can wait.
Thanks DrAlx for your good work with the layout.
A couple of comments - the adapter board spacing on the perfboard is 7 holes by 14 holes - I assume that is how you have laid it out?
Also, you could include links under the adapter board but there would need to be insulation under the board as there are tracks which could short against the links.
His adaptor is the right size already. Hard to see.
Sent from my SM-G920F using Tapatalk
Thanks for that.
DrAlx, I've checked your layout and I think it is close to verified.
By the way, your layout looks great and tidier than mine. I don't think there is an issue with the three links - a constructor can install them and cover them with some insulation tape before mounting the adapter board.
Hopefully your layout will encourage numbers of builds :icon_cool:
Quote from: Kipper4 on July 18, 2017, 11:17:51 AM
Thanks Mick. Did you mean 14 x 7
Luckily I have one on the bench.
OOPs, yeah, 14x7 . When buying the soic28 adapters it is always worth a check on the width as I have come across different widths but all the ones I have are 7 wide.
I just need to check it again, but I have an 24 x 18 perfboard layout.
I'll be using 14 header pins on the adaptor.
The chip is still not much taller than a short polarised cap.
That's a great suggestion Kipper and would eliminate any potential shorts on the underside of the adapter board.
I'm in the process of building another FVerb using DrAlx's cool layout to verify it.
Quote from: gcwills on July 19, 2017, 06:39:50 PM
That's a great suggestion Kipper and would eliminate any potential shorts on the underside of the adapter board.
I'm in the process of building another FVerb using DrAlx's cool layout to verify it.
Sorry, but I just modified the links above :icon_redface: The layout is still 18x22 but I got rid of all the underboard jumpers.
No apologies required! That's even better thanks ;)
Means you can use header pins or my more basic approach of wire links through both boards.
I managed to get it down to 17x22 holes. The zip file has all the images and vrt files...
https://1drv.ms/u/s!AvrH61utWEtEh2jXTG6EGa-DDU7R
My layout
post removed for correction Thanks Dr Alx
new links
(https://s26.postimg.org/zcossw6vp/FVerb.png) (https://postimg.org/image/zcossw6vp/)
(http://imgur.com/ljSeEye)
http://imgur.com/ljSeEye
The middle pin of the voltage regulator should be ground.
That made me go and check the pinout on my own layout against the datasheet and I realised my regulator was in back to front. I've corrected all my above links.
EDIT: I don't have a 78L33 handy so I originally assumed the pinout would match a 78L12 (which I do have) but the online datasheet for the 78L33 from ST seems to have opposite pinout to that.
So check the pinout of whatever regulator you use. Middle pin seems to be ground in both of the TO-92 packages I have seen.
I noticed that Kipper included a 1M anti-pop resistor at the input which is a good idea. I also noticed that there is no protection diode connecting the input and output of the regulator, so I have added those 2 things to this 16x23 layout here:
https://1drv.ms/i/s!AvrH61utWEtEh3Mcmy6A5zc7-d0R
Thanks for that DrAlx.I like your earlier 22 X 18 layout and am currently waiting for some parts to build another FVerb using it.
It certainly makes for a simple build in keeping with the simple circuit :icon_mrgreen:
Have just received another FV-1 so thought I'd post some images of the build.
This time I'm using DrAlx's 22 X 18 perf board layout:
(https://s28.postimg.org/r2wwpue4p/18x22_sans_IC_1.png) (https://postimg.org/image/r2wwpue4p/)
Here is the FV-1 mounted on the adapter board:
(https://s28.postimg.org/nux6v45ft/FVerb_build.jpg) (https://postimg.org/image/nux6v45ft/)
You can see that the FV-1 can be soldered to the adapter board fairly easily with a fine tipped iron. I tinned the pads on the adapter board first to make the soldering easier. If neighbouring pads are accidentally bridged when soldering, the excess solder can be removed with solder wick or a solder sucker.
I decided to use header pins between the adapter board and the perf board, but you could just use cutoff resistor leads to mount the adapter board.
I'll post some more images as the board is assembled to assist any builders of the FVerb 8)
Been a bit distracted with other projects :icon_redface:
Finally populated the new perfboard with Alex (DrAlx)'s great layout.
A big thanks to Alex for really tidying up the layout making it straightforward to build.
And by the way, as Alex mentioned, the 78L33 is shown backwards in the above layout diag.
Speaking of which, any FVerb builds in the pipeline??
Here is the populated board:
(https://s2.postimg.org/mlnyejr51/Alex_s_layout.jpg) (https://postimg.org/image/mlnyejr51/)
And the board underside:
(https://s2.postimg.org/yc1vvxjxh/Alex_underside.jpg) (https://postimg.org/image/yc1vvxjxh/)
See what I mean about using the header pins for the daptor board?
It will be just about the same height as the caps.
I'll post a pic.
No build yet I'm waiting to see what yours looks like..... :)
I agree Kipper, the header pins simplify mounting the adapter board.
BTW, I just noticed that I missed a link on the underside of the perfboard between pins 13 and 16 of the FV-1.
(https://www.bitsbox.co.uk/images/small/14wayskt_sml.jpg)
Oops :icon_redface:
Just realised there are a couple more missing links in the above photo of my perfboard.
Anyone building a FVerb please disregard that photo and stick with Alex's layout!
Well finally finished a FVerb using Alex's layout.
We can call that layout verified as long as you reverse the orientation of the 78L33.
Here is the perfboard installed in a 1590B:
(https://s26.postimg.org/3st3rby0l/FVerb_final.jpg) (https://postimg.org/image/3st3rby0l/)
Here is the layout used:
(https://s26.postimg.org/i0isfzaph/18x22_sans_IC_1.png) (https://postimg.org/image/i0isfzaph/)
Any FVerbs in the pipeline? 8)
For some reason unknown to me, all of my postimage images have disappeared from my FVerb thread.
So I am reposting them here for any prospective builders.
To view the images in detail, just click on them.
Thanks to Rob Strand for his advice :)
Quote from: gcwills on July 04, 2017, 02:55:25 AM
Hi all,
The motivation for this project started some time ago when I heard a Blackstar amp equipped with reverb. The reverb was generated by a Spin FV-1 DSP IC and I was very impressed with how good it sounded.
Some research followed including the good work by Ice 9 and others here. However I was not too keen to have to program an external EPROM and there didn't seem to be much out there in the way of a really simple diy implementation of a FV1. I started wondering how simple a basic pedal could be using the internal ROM programs with minimal extra circuitry.
So after quite an amount of digging around and prototyping, I came up with this design which is about as simple as a FV1 pedal could be. It was developed with the hope that it will inspire those who have built basic PT2399 pedals to have a go - it uses less components than a Rebote for much more functionality. The simplest incarnation offers hall reverb, tremolo, pitch shift and vibrato and sounds great!
It is also easy to build, using a perfboard rather than a custom pcb.
More constructional information to come!
(https://s7.postimg.cc/pjc8hpm0n/Easy_Verb_1.jpg) (https://postimg.cc/image/pjc8hpm0n/)
Quote from: gcwills on July 04, 2017, 08:11:40 PM
Thanks for the interest in my FVerb.
Here is the schematic - click on it to enlarge
(https://s23.postimg.cc/5d6fu4t9z/FV1_edit_SPDT.jpg) (https://postimg.cc/image/5d6fu4t9z/)
As you can see it is a minimal implementation of a FV-1 with not much more than the FV-1 and a TL072 as input buffer and dry/wet mixer.
Some economies have also been taken with only two controls - one for the FV-1 which bridges the POT0 and POT1 inputs in a similar arrangement to the EHX Holy Stain. This allows for adjusting reverb decay, tremolo speed, pitch bend and vibrato with one control. The POT2 input is pulled high to maximise the tremolo and vibrato depth. The second control adjusts the amount of wet signal in the mix. Adjusting this control also adjusts the amount of tremolo and vibrato.
To keep things simple, a SPDT centre off switch is used to switch between the internal ROM programs. I initially used a BCD switch to select all 7 programs, but found that of these 7 programs the two reverb and two pitch modes are quite similar. Also I found that the two remaining chorus and flange modes can be approximated when the pitch mode is set close to unison to create a pretty lush chorus/vibrato mode which I preferred to the chorus or flange modes. This meant that a simple mini centre off toggle switch could be used to select between hall reverb, tremolo, pitch shift and vibrato/chorus. The toggle switch was also much easier to use in operation.
A simple buffered bypass is used which works well, simplifies wiring and uses a cheap SPST switch.
To come are some comments and photos of the pedal internals and on parts availability :)
Quote from: gcwills on July 05, 2017, 09:53:43 PM
Moving on to building the FVerb.
Perhaps one reason that the FV-1 is not used in diy as much as say a PT2399 is that it is housed in a 28 pin SMD package which is difficult to use in a conventional through hole perf or vero board.
To get around this, I used a pcb adapter which converts the SOIC package to a conventional 28 pin DIL arrangement. The FV-1 can be soldered fairly easily to the adapter with a fine soldering tip and if you happen to bridge adjacent pins during soldering, the excess solder can be removed with solder wick.
Here is a photo of the adapter pcb - AU$1 including post from ebay ;D
(https://s10.postimg.cc/7baavtkj9/SSop28.jpg) (https://postimg.cc/image/7baavtkj9/)
By the way, thanks to Ice-9 and MetalGuy for the heads up on sourcing the FV-1 - you can also buy them from Aliexpress.
Quote from: gcwills on July 06, 2017, 08:43:13 PM
Here is an internal shot of the completed FVerb:
(https://s22.postimg.cc/5kpc7b65p/FVerb_2.jpg) (https://postimg.cc/image/5kpc7b65p/)
After the FV-1 has been soldered to the DIP28 adapter board, the adapter board was mounted on a 24 by 12 hole perf board. The adapter board is fixed to the perf board by soldering a loop of wire through pins 1 and 2 through the perf board and soldered there. Similarly a loop is soldered through pins 12 and 13 and then another loop through pins 24 and 25. This fixes the adapter board firmly to the perf board and allows for the other connections to be made to the FV-1.
There is not a lot more to the board - the TL072 and a 3.3V voltage regulator. I have been too lazy to generate a perf board layout, but perhaps some kind soul here may oblige ::)
The FVerb was built into a standard 1590B with the two pots, mode switch and footswitch mounted on the front, the DC connector at the rear and input/output sockets at the side. I built the prototype initially with a 3 position DIP switch for program selection before the SPDT centre-off program selector switch was installed. This is not needed in a build.
I found that some care needs to be taken with grounding the controls and input and output sockets. I'll provide more details later, but suffice to say I was able to eliminate any extraneous noise with proper grounding.
More to come!
Quote from: gcwills on August 10, 2017, 09:33:25 PM
Have just received another FV-1 so thought I'd post some images of the build.
This time I'm using DrAlx's 22 X 18 perf board layout:
(https://s28.postimg.cc/r2wwpue4p/18x22_sans_IC_1.png) (https://postimg.cc/image/r2wwpue4p/)
Here is the FV-1 mounted on the adapter board:
(https://s28.postimg.cc/nux6v45ft/FVerb_build.jpg) (https://postimg.cc/image/nux6v45ft/)
You can see that the FV-1 can be soldered to the adapter board fairly easily with a fine tipped iron. I tinned the pads on the adapter board first to make the soldering easier. If neighbouring pads are accidentally bridged when soldering, the excess solder can be removed with solder wick or a solder sucker.
I decided to use header pins between the adapter board and the perf board, but you could just use cutoff resistor leads to mount the adapter board.
I'll post some more images as the board is assembled to assist any builders of the FVerb 8)
Quote from: gcwills on August 24, 2017, 09:52:45 PM
Been a bit distracted with other projects :icon_redface:
Finally populated the new perfboard with Alex (DrAlx)'s great layout.
A big thanks to Alex for really tidying up the layout making it straightforward to build.
And by the way, as Alex mentioned, the 78L33 is shown backwards in the above layout diag.
Speaking of which, any FVerb builds in the pipeline??
Here is the populated board:
(https://s2.postimg.cc/mlnyejr51/Alex_s_layout.jpg) (https://postimg.cc/image/mlnyejr51/)
And the board underside:
(https://s2.postimg.cc/yc1vvxjxh/Alex_underside.jpg) (https://postimg.cc/image/yc1vvxjxh/)
Quote from: gcwills on September 19, 2017, 03:57:59 AM
Well finally finished a FVerb using Alex's layout.
We can call that layout verified as long as you reverse the orientation of the 78L33.
Here is the perfboard installed in a 1590B:
(https://s26.postimg.cc/3st3rby0l/FVerb_final.jpg) (https://postimg.cc/image/3st3rby0l/)
Here is the layout used:
(https://s26.postimg.cc/i0isfzaph/18x22_sans_IC_1.png) (https://postimg.cc/image/i0isfzaph/)
Any FVerbs in the pipeline? 8)
> For some reason unknown to me, all of my postimage images have disappeared
Postimg.org got in a tiff with somebody and lost control of that domain name.
Everything is (as you seem to know) on Postimg.cc, same urls except .cc in place of .org
Thanks PRR!
Updated thread title to point to reposted images ;)