Chunk Systems - Agent 00FUNK!  [traced]

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Re: Chunk Systems Agent 00FUNK!

Postby chicago_mike » 20 Sep 2014, 02:11

first overlay..I'll post a couple more later for referral.
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Re: Chunk Systems Agent 00FUNK!

Postby karul » 20 Sep 2014, 02:12

I've forgot to add this part in previous post.
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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 20 Sep 2014, 05:01

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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Re: Chunk Systems Agent 00FUNK!

Postby karul » 20 Sep 2014, 12:45

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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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 20 Sep 2014, 18:14

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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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 21 Sep 2014, 04:20

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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Re: Chunk Systems Agent 00FUNK!

Postby Nocentelli » 21 Sep 2014, 12:47

Does this mean you've done a vero layout, johnk?
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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 21 Sep 2014, 16:29

no. I etched a pcb for it.
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Re: Chunk Systems Agent 00FUNK!

Postby Nocentelli » 21 Sep 2014, 16:38

Dammit, i'll have to do my own.. :wink:
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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 22 Sep 2014, 16:49

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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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 22 Sep 2014, 17:03

BTW, I also tried 3 different brand new chip sets in it and all of them had the same results.
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Re: Chunk Systems Agent 00FUNK!

Postby chicago_mike » 22 Sep 2014, 17:20

I'll see if I can get a voltage chart.
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Re: Chunk Systems Agent 00FUNK!

Postby chicago_mike » 22 Sep 2014, 17:23

I made the trace side b/w. This might help??
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Re: Chunk Systems Agent 00FUNK!

Postby chicago_mike » 22 Sep 2014, 17:32

Here is the orgional Agent Funk I Schematic, for reference?
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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 22 Sep 2014, 18:34

chicago_mike wrote:I'll see if I can get a voltage chart.


that would be awesome!
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Re: Chunk Systems Agent 00FUNK!

Postby chicago_mike » 22 Sep 2014, 19:50

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

In case I cannot get the voltages..
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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 22 Sep 2014, 21:47

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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Re: Chunk Systems Agent 00FUNK!

Postby chicago_mike » 23 Sep 2014, 05:00

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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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 23 Sep 2014, 05:21

okay. that would be great.
i'll take 'em and try to post 'em later tonight.
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Re: Chunk Systems Agent 00FUNK!

Postby johnk » 23 Sep 2014, 06:43

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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