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Projects => General Questions => Topic started by: guile on July 01, 2016, 02:51:11 PM

Title: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: guile on July 01, 2016, 02:51:11 PM
I built the MXR 120 envelope filter (Tonepad): http://tonepad.com/getFile.asp?id=113

I have a dry guitar signal but no effect. I'm not doing any of the mods. Can anyone point out to me what I need to jumper (if any)?
Thanks in advance!
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: guile on July 01, 2016, 03:00:33 PM
Here are pics of the pcb
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: Govmnt_Lacky on July 01, 2016, 04:20:56 PM
IC3 is supposed to be a CD4066..... you have a 4069 in there  :o
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: guile on July 01, 2016, 04:33:21 PM
Thanks!  You have a sharp eye.
I will report back
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: Govmnt_Lacky on July 01, 2016, 05:18:36 PM
I also believe that you need to jumper E&F together as well as G&H together to get the stock circuit.

Good luck  ;D
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: guile on July 01, 2016, 06:46:53 PM
Thanks again
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: guile on August 01, 2016, 06:50:25 PM
Many thanks Govmnt_Lacky.
Finally got the part, works great now. Feelin 'all seventies  8)
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: guile on August 10, 2016, 02:17:29 PM
Anyone know how to cure the huge volumedrop when engaged?
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: guile on August 16, 2016, 08:05:43 AM
Can anyone please take a look at the circuit and tell me what I could do to boost the effectsignal to unity gain?
Many thanks!
Title: Re: No quack from MXR 120 envelope filter (Tonepad Agua filter)
Post by: m-Kresol on August 16, 2016, 08:35:54 AM
you could try lowering R1 or increasing R2. They form filters with C2 and C4 though, so it might be you need to adjust those too.
I'd suggest going to 360-470k with R2 first and see how it sounds. Use sockets. Desoldering can be a pain.
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