DOD FX60 Schematic

[bloxstompboxes]

Hey Guys,

Here is the schem I am working from:

Alright, so I am drawing up my own layout for this pedal... yeah I know there are other and better choruses. I just thought that there are 100s of fuzzes and distortions but like 5 choruses with layouts in the DIY world and that I might try my hand at a couple that are layoutless. I like doing layouts so why not. Anyway, in this schematic, which I understand is the one they actually supplied with the pedals, there is no value for the input cap after the 470k ohm resistor. There is also a goof in the ref des for the cap to gnd on the TL022 in the center of the page. It states 120k. I assume it is a 120pf. Can anyone with this pedal advise as to what these values are?

There is another schemematic that has extra transistor buffers in the circuit and those corresponding values for those filters in are different, or I would just use them. I have read that when the FX65 came out, I think it was, they started using the same boards for both pedals and adapted the circuit of the FX60 to do so. Hence, the change in values to work with the new buffers.

Any help is appreciated!

[bloxstompboxes]

Repalced the schematic link with one that works. Sorry about that.

[PRR]

> no value for the input cap after the 470k ohm resistor.

0.01uFd against 470K gives bass-cut at 33hz which ought to be plenty for the purpose.

> There is also a goof in the ref des for the cap to gnd on the TL022 in the center of the page. It states 120k. I assume it is a 120pf.

Yes, 120pFd. -1dB at 6.4KHz, -3dB at 8.3KHz, -22dB at 20KHz, beautiful 3rd-order response.

[bloxstompboxes]

Those were my guesses PRR. Thanks for the confirmation!

[bloxstompboxes]

Wait a minute. Where is the biasing for the opamps?

Nevermind. I'm an idiot.