Author Topic: mid-fi clai(not) schematic!  (Read 161303 times)

doc_drop

Re: mid-fi clai(not) schematic!
« Reply #20 on: March 22, 2009, 10:51:37 AM »
I see. It is a pretty simple concept that was easy to understand as I read up on how people use these in a circuit.

Now practically speaking as far as my build, I saw what the box looks like in the videos. The LED is mounted like in a regular stomp box. I don't see any LDR on the exterior, so where is it? How does the light of the LED hit it? And since there are no values given, and no color for the LED, what kind of LDR should I use?

Ideas? Thanks!

doc_drop


Barcode80

Re: mid-fi clai(not) schematic!
« Reply #22 on: March 22, 2009, 01:44:35 PM »
yeah i was just going to post that the status led is not the led in the led/ldr combo. You can also make your own vactrol by getting an ldr at radioshack and heatshrinking your own led to it.

doc_drop

Re: mid-fi clai(not) schematic!
« Reply #23 on: March 23, 2009, 11:29:09 AM »
So, I ordered 3 different types of these variactors from Allied. I figure I will try all 3 to decide which works best. I actually found the part number from ROG's phasor project, via Google. I'm kind of excited about this "new" part, and the circuit snippet for it. I am wondering what else it might be used to control...

Anyway, I should have this guy bread boarded in a week, once I get all the parts. We'll see if I can get it working.

Arn C.

Re: mid-fi clai(not) schematic!
« Reply #24 on: March 23, 2009, 11:55:25 AM »
Doc_drop,
     Let us know for sure which Vactrol works the best .  I have a few left that I will use for this project.

Thanks!
Arn C.

doc_drop

Re: mid-fi clai(not) schematic!
« Reply #25 on: March 23, 2009, 12:00:57 PM »
Sure Arn. I will definately post a build report for this one.

orangetones

Re: mid-fi clai(not) schematic!
« Reply #26 on: March 23, 2009, 02:36:43 PM »
I used a homemade photocoupler for this on the breadboard and it worked just fine.  I can check the value of the LDR in that on, but I think it was around 5k-500k.  I would suspect most would work fine in this circuit.

doc_drop

Re: mid-fi clai(not) schematic!
« Reply #27 on: March 23, 2009, 02:50:50 PM »
The ones I ordered were the VTL5C1,  VTL5C2 and VTL5C4. I guess I'll see which works best once I get them and plug them into the circuit. The biggest difference I see is that the VTL5C2 has a turn off time of 500ms and the others are 35ms, so I guess that would be a big difference in how the thing tracks picking strength. I am looking forward to hearing the results.

orangetones

Re: mid-fi clai(not) schematic!
« Reply #28 on: March 23, 2009, 04:45:52 PM »
If I remember correctly, from that other site, the original uses a bright white LED and an LDR, not a commercial photocoupler.  Again, not sure of the resistance on the photocoupler.

I did notice that with this circuit you adjust the brigthness of the LED with the controls though, so having the right range might not be an issue.

I get what you are saying about the fall time of the photocoupler though.  Should produce a bit of a different sound, however, hifidelity and this circuit are not synonymous.

Do let us know what you think once you get your order.

orangetones

Re: mid-fi clai(not) schematic!
« Reply #29 on: March 23, 2009, 04:57:56 PM »
Here is a quote from the designer himself from that other forum, where you will also find perfboard and PCB layouts...
___________________________
Q: Maybe if Danelectro gets a hold of that schem they can build one cheap enough for all of us to afford.  Just kidding of course. On a serious note , what is the range of the photo cell?

A: doenst really matter, as long as it gets down under 5k or so, and goes about 200k your good.

_____________________________________________

Now that doesn't mean you need that exact range, just to be able to reach those ranges.  Cheapo Ratshack LDRs should work for this, with red, yellow, or white LEDs.

doc_drop

Re: mid-fi clai(not) schematic!
« Reply #30 on: March 23, 2009, 05:05:56 PM »
Interesting orangetones.

I'm afraid I don't know what the "other" site is, so I haven't been able to read that. Thanks for sharing.

doc_drop

Re: mid-fi clai(not) schematic!
« Reply #31 on: March 30, 2009, 12:28:10 PM »
If you guys are interested, I posted my build report here:

http://www.diystompboxes.com/smfforum/index.php?topic=75365.0

Short story: This guy RAWKS!!!

snap

Re: mid-fi clai(not) schematic!
« Reply #32 on: March 30, 2009, 01:33:33 PM »
well, since the originator is here,
why not ask himself?

frequencycentral

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Tight little Clari(not) perf layout!
« Reply #33 on: April 19, 2009, 11:05:51 AM »
I've done this perf layout, I've got all the parts, just need to get it built. I think the layout is correct. I'm planning to mount the LED/LDR and output cap onto the pots to keep wiring down to a minimum. Would some kind person check it over please?

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doug deeper

Re: mid-fi clai(not) schematic!
« Reply #34 on: April 19, 2009, 07:29:00 PM »
fyi the perf layout in the other thread is the exact one i use!
 :)

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Re: mid-fi clai(not) schematic!
« Reply #35 on: April 20, 2009, 12:18:25 PM »
fyi the perf layout in the other thread is the exact one i use!
 :)

Thanks Doug, but I wanted to do my own layout to suit the way I'm planning to box it up. By the way, which pots are LOG/LIN? The schematic isn't specific. Thanks!
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Cardboard Tube Samurai

Re: mid-fi clai(not) schematic!
« Reply #36 on: April 20, 2009, 06:58:41 PM »
I used all linear pots except for the volume. Works fine

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Re: mid-fi clai(not) schematic!
« Reply #37 on: April 20, 2009, 07:00:28 PM »
I used all linear pots except for the volume. Works fine

Thanks, that's what I figured. I just didn't want to risk putting it together with the wrong pots and have to change them later.
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cheezit

Re: mid-fi clai(not) schematic!
« Reply #38 on: April 20, 2009, 10:36:21 PM »
I'm looking at the schematic and wondering---just where is the "fuzz" coming from?  It would have to be the LM386 going full tilt, right?  I don't see clipping diodes or cascaded transistors anywhere...driven hard, the PT2399 might add some blatty grit, I suppose.

bluesdevil

Re: mid-fi clai(not) schematic!
« Reply #39 on: April 21, 2009, 01:26:51 AM »
Connecting pins 1 and 8 together on the 386 is what's doing it I believe.
"I like the box caps because when I'm done populating the board it looks like a little city....and I'm the Mayor!" - armdnrdy