Chunk Systems - Agent 00FUNK!  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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chicago_mike
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Post by chicago_mike »

first overlay..I'll post a couple more later for referral.
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karul
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Post by karul »

I've forgot to add this part in previous post.
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johnk
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Post by johnk »

I thought the same thing but pins 6&7 on the LM324N are supposed to be vref on a standard voltage divider(4.5Volts) so i'm not getting why you would ground them.

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Post by karul »

johnk wrote:I thought the same thing but pins 6&7 on the LM324N are supposed to be vref on a standard voltage divider(4.5Volts) so i'm not getting why you would ground them.
They are not grounded, they ARE - Vref.

As I've mentioned before, for some reason on the Mike's schematic they have used the earth ground symbol to indicate virtual ground points (Vref) , and -V to indicate ground.
For some reason Mike's schematic use bipolar circuit symbols +/-V and GND.
Bernard's schematic use singe supply circuit symbols V, V/2=Vref and GND.
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johnk
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Post by johnk »

okay. that's what I thought. then Bernard's schematic is actually the same as Mike's.
and if that's the case, i'll have to go over my build a lot more since something is definitely not right.

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Post by johnk »

well, i'm getting closer. I can actually hear the filter kicking in in one of the up down positions but it's not stable and very hard to dial it in.
so i'm going to stick with it and see if I a can solve it.

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Post by Nocentelli »

Does this mean you've done a vero layout, johnk?
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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Post by johnk »

no. I etched a pcb for it.

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Post by Nocentelli »

Dammit, i'll have to do my own.. :wink:
modman wrote: Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...

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Post by johnk »

I have now checked every component and trace on my layout and build and i'm 100% confident that it matches the schematic perfectly but it's still not working properly.
possibly the IC pin voltages from a working unit would help solve it?

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Post by johnk »

BTW, I also tried 3 different brand new chip sets in it and all of them had the same results.

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Post by chicago_mike »

I'll see if I can get a voltage chart.
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chicago_mike
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Post by chicago_mike »

I made the trace side b/w. This might help??
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chicago_mike
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Post by chicago_mike »

Here is the orgional Agent Funk I Schematic, for reference?
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Post by johnk »

chicago_mike wrote:I'll see if I can get a voltage chart.
that would be awesome!

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Post by chicago_mike »

Just don't give up on your end. :D

In case I cannot get the voltages..
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Post by johnk »

chicago_mike wrote:Just don't give up on your end. :D

In case I cannot get the voltages..
i'[m going to try and keep at it, but without those voltages, it's going to be really hard to solve.

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Post by chicago_mike »

Hey John, post up some voltage readings your getting.

I'll send an email off to Godlyke and see if they have any voltage charts. I got the schemas from them anyways.
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Post by johnk »

okay. that would be great.
i'll take 'em and try to post 'em later tonight.

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Post by johnk »

here are my chip voltage readings.............

power at DC jack 9.00V

LM324N:
1: 4.55V
2: 4.55V
3: 4.50V
4: 9.00V
5: 4.30V
6: 4.50V
7: 4.50V
8: 4.50V
9: 4.50V
10: 4.50V
11: 0V
12: 4.50V
13: 4.50V
14: 4.50V

TL074:
1: 4.50V
2: 4.50V
3: 4.50V
4: 9.00V
5: 4.50V
6: 4.50V
7: 4.50V
8: 4.89V
9: 4.50V
10: 4.50V
11: 0V
12: 4.50V
13: 4.24V
14: 3.07V

LM13700N:
1: 1.69V
2: 0.52V
3: 4.50V
4: 4.50V
5: 5.47V
6: 0V
7: 5.47V
8: 4.50V
9: 4.16V
10: 5.24V
11: 9.00V
12: 5.24V
13: 4.50V
14: 4.50V
15: 0.44V
16: 1.69V

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