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 Post subject: Spring Reverb Issues
PostPosted: Sun Jul 15, 2018 3:56 am 
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Joined: Sun Jul 15, 2018 3:48 am
Posts: 4
Hi folks!
First time poster, long time builder here.

Recently I built the Spring Reverb kit, all was fine and fully functional and I also modded it with the Moody Tone kit (inserted after the Reverb pot), also fully functional.

Then I wanted to try it together with my powersupply´s 18VDC feed to get the "increased headroom" stated in the description and after that I get no wet sound. The dry sound still passes when the pedal is engaged, and I also get a spring reverb "swishy" tail when I power the pedal up in the "engaged mode".

I´ve so far redone all the solder joints and I´ve measured that I still have +5V feeding the reverb circuit.

Has anybody else had this problem and what could a possible solution be? I´ve removed the tone pot mod, but the problem still remains so the error must be on the "main" board.

Best Regards Fredrik

edit: pictures can be seen here: https://www.dropbox.com/sh/o3aukvgr4k54 ... Sqswa?dl=0


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 Post subject: Re: Spring Reverb Issues
PostPosted: Mon Jul 23, 2018 5:48 pm 
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Joined: Sun Jan 22, 2006 1:39 pm
Posts: 5984
Location: Richland, WA
Does it still work with 9v?

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Please do not PM me. email is prefered. keith@buildyourownclone.com


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 Post subject: Re: Spring Reverb Issues
PostPosted: Tue Jul 24, 2018 11:39 pm 
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Joined: Sun Jul 15, 2018 3:48 am
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No, wet signal is all dead; can hear some faint reverbtails when turning the knobs really fast from one end to the other.

I can also hear some kind of oscillation in the background.

Took the reverb module out today and resoldered the IC sockets etc beneath it, did not help either.


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 Post subject: Re: Spring Reverb Issues
PostPosted: Wed Jul 25, 2018 8:28 am 
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Joined: Tue Jan 02, 2007 1:24 pm
Posts: 16196
Location: Albany, NY
You've switched the positions of the 100K and 1M resistors near the bottom of the board. I very much doubt that would cause your lack of wet signal, but it should be fixed.

I would suggest trimming some of those protruding component leads and wire ends (particularly those inside the I/O jack solder tabs) to minimize the chance of a signal short. Also, check closely between the reverb module pins on both sides of the PCB to make sure you don't have any solder shorts between adjacent pins.

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 Post subject: Re: Spring Reverb Issues
PostPosted: Thu Jul 26, 2018 11:25 am 
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Joined: Sun Jul 15, 2018 3:48 am
Posts: 4
Will swap the resistors, thanks for spotting that!
Have resoldered the unit yet another time now and gone through all the joints etc, the fact that it did work fine before running it on 18V makes me suspect that something is a goner, it does also smell a bit of burnt electronics.

Any suggestions on how to measure the signalpath to see where the wet signal disappears? I have no oscilloscope, but I do have a multimeter and the possibility to generate signals with my DAW.


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 Post subject: Re: Spring Reverb Issues
PostPosted: Thu Jul 26, 2018 12:06 pm 
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Location: Albany, NY
Do you have access to a multimeter and know how to measure DC voltage with one?

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“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


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 Post subject: Re: Spring Reverb Issues
PostPosted: Thu Jul 26, 2018 12:32 pm 
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Yes!


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 Post subject: Re: Spring Reverb Issues
PostPosted: Thu Jul 26, 2018 12:56 pm 
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Joined: Tue Jan 02, 2007 1:24 pm
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Location: Albany, NY
OK, let's start with the DC voltage readings at the following points:

1) Both sides of the polarity protection diode in the lower right corner of the board.
2) ALL of the pins on each of the two op amps. Pin 1 is the square solder pad, then count around in a U-shape, so that pin 8 will be the one directly across from pin 1.
3) Pin 1 of the reverb module.

Please measure those and post your readings here.

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“My favorite programming language is SOLDER” - Bob Pease (RIP)

My Website * My Musical Gear * My DIY Pedals: Pg.1 - Pg.2


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