Amptweaker - Tight Metal  [traced]

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Re: Amptweaker - Tight Metal

Postby jymaze » 24 May 2013, 15:52

If someone could plug it in a schematic software, it would be nice. I just don't like to do it and I think it is nice to give people the option to participate :D .
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Re: Amptweaker - Tight Metal

Postby jymaze » 24 May 2013, 16:47

Repost, the bottom of the schematic got cut-out by my scanner. This one is fine:
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Re: Amptweaker - Tight Metal

Postby coldcraft » 24 May 2013, 19:43

thanks for your hard work. does Vref not have a bypass cap to ground?
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Re: Amptweaker - Tight Metal

Postby jymaze » 24 May 2013, 20:52

Yep, did not detail the PSU too much. Basically it is like I represented, except it happens multiple times around the board, sometimes with decoupling, sometimes not, sometimes with a resistor to the opamp non-inverting input, sometimes not. It is very random as I see it. I would make one solidly decoupled Vref and use it for all needs. The main 9v is also decoupled with a big 100u cap and a smaller 100n poly cap, it feeds the opamps directly. Then there is a low pass filter (6.8k and 22u) that leads to the voltage point used for all the Vref points. It is a very oversized PSU, but whatever... I can draw it if you really want...

Also, I retraced and found an error around the tight control, so here it is again, correct for now at least:
Tight Metal - First Draft.pdf


The diodes between the inputs are a little mysterious to me... from the output to the input, fine, but across the inputs... Whatever... Not sure they ever rectify anything, but who knows...
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Bill_Mountain (27 May 2013, 15:03), Eisy (24 May 2013, 22:47), FiveseveN (25 May 2013, 11:59)
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Re: Amptweaker - Tight Metal

Postby Eisy » 24 May 2013, 22:47

jymaze wrote:The diodes between the inputs are a little mysterious to me... from the output to the input, fine, but across the inputs... Whatever... Not sure they ever rectify anything, but who knows...


I guess they are just for protection?
Anyway, thanks for tracing!
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 24 May 2013, 23:44

jymaze wrote:Repost, the bottom of the schematic got cut-out by my scanner. This one is fine:


:applause: I will try to go over it tonight against the board... May make a layout in Sprint if I get ambitious?
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 25 May 2013, 02:31

jymaze wrote:If someone could plug it in a schematic software, it would be nice. I just don't like to do it and I think it is nice to give people the option to participate :D .



I don't have any simulation software so it's gonna be freestyle for me...
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Re: Amptweaker - Tight Metal

Postby euronymous0001 » 25 May 2013, 03:58

jymaze wrote:
If someone could plug it in a schematic software, it would be nice. I just don't like to do it and I think it is nice to give people the option to participate :D .


:secret:

http://www.filedropper.com/tightmetal
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 25 May 2013, 04:14

euronymous0001 wrote:
jymaze wrote:
If someone could plug it in a schematic software, it would be nice. I just don't like to do it and I think it is nice to give people the option to participate :D .


:secret:

http://www.filedropper.com/tightmetal



won't open for me?
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Re: Amptweaker - Tight Metal

Postby bajaman » 25 May 2013, 05:28

what program opens this .sch file ? :hug:
Altium designer just shows a blank page :(
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Re: Amptweaker - Tight Metal

Postby bajaman » 25 May 2013, 05:41

tried EAGLE - got load error 292 etc. :(
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 25 May 2013, 05:58

bajaman wrote:tried EAGLE - got load error 292 etc. :(



Got the same error... opened with notepad and there is definitely code in there?
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Re: Amptweaker - Tight Metal

Postby euronymous0001 » 25 May 2013, 06:32

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Re: Amptweaker - Tight Metal

Postby bajaman » 25 May 2013, 07:32

using Eagle 6.40 light :wink:
downloaded new file :thumbsup
still getting the same error :? :( :(
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Re: Amptweaker - Tight Metal

Postby euronymous0001 » 25 May 2013, 08:02

http://www.filedropper.com/tightmetal_2

used eagle lite 6.4 this time :mrgreen:
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Re: Amptweaker - Tight Metal

Postby J0K3RX » 25 May 2013, 10:23

Here it is a little less chopped up...
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Re: Amptweaker - Tight Metal

Postby euronymous0001 » 25 May 2013, 10:43

can't decipher the component connected to lug 3 of the tone pot. can't read if its 33k or 33n :scratch:

also, the pots might be reversed wired on my eagle file :mrgreen:

and not sure diode types :slap:
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Re: Amptweaker - Tight Metal

Postby bajaman » 25 May 2013, 11:46

it would be interesting to know what the diodes are - schottky, zeners, ultrafast, general purpose :?: :hmmm: :hmmm:
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Re: Amptweaker - Tight Metal

Postby coldcraft » 25 May 2013, 13:03

I tried a noise gate like that once and was disappointed in its performance. I guess I didn't have enough gain before it.
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Re: Amptweaker - Tight Metal

Postby coldcraft » 25 May 2013, 13:09

as drawn in the eagle schematic, the Gate pot is backwards. The resistance should increase as the gain is turned up.
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