Author Topic: Kompromat only works in bypass  (Read 1991 times)

jimilee

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Re: Kompromat only works in bypass
« Reply #30 on: February 08, 2022, 12:40:47 PM »
Let's give him time to make some trials and measurements and then we all will be smarter.
Im thinking it’s got to be that diode.


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matmosphere

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Re: Kompromat only works in bypass
« Reply #31 on: February 08, 2022, 01:13:17 PM »
That jack is kind of unusual. I’m wondering if it could be the problem. Since our pedals all use center negative I wonder if the metal casing, which is probably connected to the positive barrel of the power supply is causing a short.

Any link to that part?

Zerro

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Re: Kompromat only works in bypass
« Reply #32 on: February 08, 2022, 02:15:36 PM »
No problem to swap that power jack polarity. Center + and body -. Seems to me, it was always better concept.
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matmosphere

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Re: Kompromat only works in bypass
« Reply #33 on: February 08, 2022, 02:35:23 PM »
No problem to swap that power jack polarity. Center + and body -. Seems to me, it was always better concept.

Yeah, but then standard power supplies won't work

jimilee

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Re: Kompromat only works in bypass
« Reply #34 on: February 08, 2022, 02:37:10 PM »
That jack is kind of unusual. I’m wondering if it could be the problem. Since our pedals all use center negative I wonder if the metal casing, which is probably connected to the positive barrel of the power supply is causing a short.

Any link to that part?
It doesn’t look as if the jack is mounted. It won’t be a problem until it’s connected to an enclosure.


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matmosphere

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Re: Kompromat only works in bypass
« Reply #35 on: February 08, 2022, 04:03:51 PM »
That jack is kind of unusual. I’m wondering if it could be the problem. Since our pedals all use center negative I wonder if the metal casing, which is probably connected to the positive barrel of the power supply is causing a short.

Any link to that part?
It doesn’t look as if the jack is mounted. It won’t be a problem until it’s connected to an enclosure.


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I was thinking the same thing, but it looked a little like there were three wires connected to it, so I wasn’t sure.

madbean

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Re: Kompromat only works in bypass
« Reply #36 on: February 08, 2022, 07:33:40 PM »
Couple things jump out:

#1 Get rid of that DC jack. Use a proper insulated (plastic) jack. Even outside of an enclosure it's possible to cause a short between the barrel of the DC plug (which is +) and the metal casing of the jack.

#2 Ideally, you'd want to have the ICs socketed especially for a case like this. That allows you to remove the ICs and rule out any issue of a current sink on one of them. IOW, it would let you more clearly determine where the issue with the 9v supply in the circuit resides. Since it appears they are soldered directly to the PCB it may make debugging more challenging. At the very least, do step #1 then see what voltage readings you get on pin8 of the TL072. That might help us narrow down the issue :)

notanelectricalengineer

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Re: Kompromat only works in bypass
« Reply #37 on: February 09, 2022, 11:44:23 AM »
Would this jack work?

madbean

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Re: Kompromat only works in bypass
« Reply #38 on: February 09, 2022, 12:18:28 PM »
Absolutely. I may have a spare or two I can mail you. I can check.

notanelectricalengineer

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Re: Kompromat only works in bypass
« Reply #39 on: February 09, 2022, 12:43:15 PM »
That'd be great because it would probably get here sooner than any website would ship.

madbean

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Re: Kompromat only works in bypass
« Reply #40 on: February 09, 2022, 01:18:25 PM »
That'd be great because it would probably get here sooner than any website would ship.

Okay, looks like I can spare one or two. Pretty low but I have enough. I should have your address from your order. I'll get back with you.

notanelectricalengineer

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Re: Kompromat only works in bypass
« Reply #41 on: February 20, 2022, 09:03:50 AM »
Little update: With the new jack, the whole pedal works! I'm never buying a metal jack again haha. I appreciate everyone's help in the matter.

matmosphere

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Re: Kompromat only works in bypass
« Reply #42 on: February 20, 2022, 11:27:57 AM »
Little update: With the new jack, the whole pedal works! I'm never buying a metal jack again haha. I appreciate everyone's help in the matter.

Pretty sure we’ve all mad that mistake once.

jimilee

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Re: Kompromat only works in bypass
« Reply #43 on: February 20, 2022, 11:37:06 AM »
Little update: With the new jack, the whole pedal works! I'm never buying a metal jack again haha. I appreciate everyone's help in the matter.
Nice, congratulations!


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