Author Topic: Pictures!  (Read 12217721 times)

KSG

Re: Pictures!
« Reply #25760 on: July 16, 2015, 10:17:31 PM »
Thanks! And now a short description:

The chain of 5 SMD diode pairs (near lower edge of board) connected to negative feedback of first opamp instead of omitted generic one.
Each pair is connected in parallel to its own resistor according a law R/2 (i.e. 220k-100k-47k-22k-10k).
This clipping method borrowed from speech handling in telecommunication system.
It is a kind of static compression and it provides a very soft clipping with a minimum of irritating grit components. 
This is a OD mode of SoulScreamer. Then level is attenuated 3:1 approx in order to equalize with level of DS mode.

In DS mode here is choice between Si and Ge limiter - Schottky diode pair or 4 different Ge (in order to equalize levels also; located at other side of board).

Next user's choice is switchable and tunable peaker (T-bridge circuit). It provides extremely bright sound!

Then there is unswitchable 8-th order LPF like a final cleaner with cut-off frequency 3 kHz (no grits anymore).

OD mode is very suitable for SRV fans and DS mode - for Blackmore ones.

My circuit is not a top secret and it is completely accessible for everyone. :-)
 
Use it or lose it.

duck_arse

Re: Pictures!
« Reply #25761 on: July 17, 2015, 10:01:18 AM »
ksg - that's a fantastic looking box. did you cnc engrave, or by hand (please say by hand)?
Last Edit: Soon at 09:27:12 by someone sensible

KSG

Re: Pictures!
« Reply #25762 on: July 17, 2015, 01:24:12 PM »
By hand, of course. The hand of artisan. It was unexpensive for me.
Use it or lose it.

KSG

Re: Pictures!
« Reply #25763 on: July 17, 2015, 01:54:38 PM »
My another monster: personal Sound Lab.

Ugly but lovely:


There are 5 devices in one box:
1) Fet Booster (Fetzer Valve de Lux R.O.G.)
2) MC33182D rail-to-rail dist followed Schottky pair
3) LPF 8-th order with cut-off 3 kHz
4) LPF 8-th order with cut-off 4,5 kHz
5) Peaker 2,8...4,2 kHz
All are true bypassed.

Lot of switches - lot of sounds!



Rat's nest? Yes, that's true...
 
Use it or lose it.

Cozybuilder

Re: Pictures!
« Reply #25764 on: July 17, 2015, 02:47:34 PM »
This just begs to be painted gold with a 999.9 stamped on it!

Some people drink from the fountain of knowledge, others just gargle.

KSG

Re: Pictures!
« Reply #25765 on: July 17, 2015, 09:21:32 PM »
My LPF sound investigations:


Use it or lose it.

KSG

Re: Pictures!
« Reply #25766 on: July 17, 2015, 09:48:10 PM »
Next girl from my harem:



inside:



Circuit:



Ferrite beads may be omitted.
Notice a little mod of Millenium Bypass: small capacitor between gate and ground gives a really magic feature "Slow-Glow" when switching on.
I love it very, very, very much and I highly recommend it!
Use it or lose it.

duck_arse

Re: Pictures!
« Reply #25767 on: July 18, 2015, 09:01:09 AM »
very nice, repurpoised box. looks like you like some of your girls more than the othere, what with no engraving for the fetzer. the ugly sister (comparitively speaking)?

and now you've shown some russian big metal can jfets, now people will be clamouring for the mojo they must contain. where did you source them from?

[edit :] spellings
« Last Edit: July 18, 2015, 09:02:44 AM by duck_arse »
Last Edit: Soon at 09:27:12 by someone sensible

KSG

Re: Pictures!
« Reply #25768 on: July 18, 2015, 02:59:15 PM »
Engraved boxes looks much better but stickered ones turn out much faster...
Concerning big can jfets - nothing special, but weird logo. They contain a pair of identical transistors with Vgs=0,35...0,4V (with letter A only).
They are accessible somewhere as NOS components. Their cost here in Russia is $1 approx.
Use it or lose it.

KSG

Re: Pictures!
« Reply #25769 on: July 18, 2015, 03:29:16 PM »
According to your request: Wampler PlexiDrive engraved.



guts:



closer:



Scheme is slightly modified (as usual):
1) Tone capacitor reconnected to taper and ground for more open sound.
2) Added 47 k in series with Q3/gate enhances sound (in my opinion).
3) Implemented my favorite slow-glow.
« Last Edit: July 18, 2015, 03:58:07 PM by KSG »
Use it or lose it.

Greenmachine

Re: Pictures!
« Reply #25770 on: July 19, 2015, 09:35:20 PM »
You have impressive skills Mr. KSG.

KSG

Re: Pictures!
« Reply #25771 on: July 19, 2015, 11:39:10 PM »
Thanks a lot!
Use it or lose it.

KSG

Re: Pictures!
« Reply #25772 on: July 20, 2015, 01:33:59 AM »
Twin brothers: FuzzFaces (mine and my mate) with bias knob, npn Ge trannies.



inside:



Guess what the insects are here beneath right corner of PCB?  ;)

Use it or lose it.

duck_arse

Re: Pictures!
« Reply #25773 on: July 20, 2015, 08:59:06 AM »
insects? I only see dead bugs. looks like they died from neatness.
Last Edit: Soon at 09:27:12 by someone sensible

storyboardist

Re: Pictures!
« Reply #25774 on: July 20, 2015, 09:39:35 AM »
Wrapped up this Heart Throb tremolo over the weekend.




Cozybuilder

Re: Pictures!
« Reply #25775 on: July 20, 2015, 09:53:26 AM »
Twin brothers: FuzzFaces (mine and my mate) with bias knob, npn Ge trannies.

inside:



Guess what the insects are here beneath right corner of PCB?  ;)

My guess is the PCB traces are too close to the edge and the bug is intermittent shorting?
Some people drink from the fountain of knowledge, others just gargle.

duck_arse

Re: Pictures!
« Reply #25776 on: July 20, 2015, 09:59:20 AM »
lightning bugs (or russian equiv)? slo-glo, of course.
Last Edit: Soon at 09:27:12 by someone sensible

Cozybuilder

Re: Pictures!
« Reply #25777 on: July 20, 2015, 10:01:15 AM »
Storyboardist-
That is an elegant graphic, I love it!
Some people drink from the fountain of knowledge, others just gargle.

stallik

Re: Pictures!
« Reply #25778 on: July 20, 2015, 11:27:23 AM »
+1 on the heartthrob.
Insanity: doing the same thing over and over again and expecting different results. Albert Einstein

ASchmalex

Re: Pictures!
« Reply #25779 on: July 20, 2015, 11:29:42 AM »
That trem looks great! Definitely something to aspire to.
Can I ask what you used for paint? Almost looks like a GM color.