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That is an important one! My build I used paper tape, because my usual standby of foam tape would not fit. The soldering leads punched though the paper tape, and I went to two layers of black electrical tape instead and that worked. My first test had funky sound because of the shorts on the...

Fire it up and let out the magic smoke! (just kdding)

Are you running this pedal with its own supply or with other pedals?

Glad you got it doing its thing! It is one of my favorite compressor pedals and is on my 'jam night' board. Unlike those compressors which are more for a pronounced effect (Dynacomp for country and jazz, etc), this one makes a clean guitar sound natural, but bigger, without being louder.

I wanted to follow up to let everyone know that PedalPCB replaced my defective Custom EEPROM and it works great! I really appreciate their help! Here are all the effects I chose: Program 0: REV004 - Blackface Reverb Program 1: REV006 - Spatialist (Room Reverb) Program 2: REV007 -...

Like @PJS said, it isn't going to work without the clock (37.768KHZ crystal). The solder of the '+' looks wonky. in the future, socket all transistors & DIP ICs. I also tend to socket clipping diodes as well, to allow for auditioning variants. D100 looks oriented correct to the one I have...

An easy way to turn your Arachnid multi-effects pedal from an 8 program effects, to 17 effects, on the fly! The stock pedal design gets its stored program instructions from IC2 24LC32A, but the FV-1 (IC3) also has 7 internal effects that are useful and musically nice. The internal effects can...

Glad to hear you have it doing its thing! Cool graphic!

I agree with @falco_femoralis , that continuity for IC1, Pins #1 & #2 are normal. It is a buffer and that is normal for a buffer. I think the 2.3mV on IC1 Pin #3 is the DVM reading its own spurious voltage. IMHO, there is a short to ground at the junction of C1, R2 & Pin#3 -or- R2 is open...

You can increase the value of the trimpot, if the FETs are 'off' the whole travel of the current trimpot. However, that just indicates out of tolerance FETs, which could be so out of tolerance, they cannot be used.

JFET compressors are known to achieve distortion, but that typically happens with the attack and release set fast (all the way counterclockwise), then having the 'compress' (a.k.a. 'sustain' or 'ratio') up past 1 o'clock. That said, being fully clockwise on the trim pot could be causing your...

Awesome - thanks!

@Robert & @pbrommer: thanks for your prompt and informative replies! Patrick: been a while, hope all is good with you and yours! A little AGF bad news, our master electronics friend Mozz passed away. One more question, was the download of Spin CAD-Designer straight forward?

After building the Arachnid, I am finding myself wanting to expand a bit down that path. A few questions: 1.) On the Arachnid: if I install a SPDT switch and send the EV-1 pin#13 to ground via where it connects to R5, will I be able to switch between the EEPROM and the FV-1's internal...

It appears to be a resistive leak of Vref, which could be caused by the concentric gain pot's pins shorting to ground, or a defective TL072, possibly a fault in the voltage divider or leads of the Vref. If insulating the gain pot doesn't fix it, try pulling IC1 and IC2 from their sockets...

Thanks again!

Bingo! Thought I bought the Octagon EPROM and I actually ordered the Module8 (as written above, but it didn't dawn on me until your post! Yes all the programs of the Module8 function as described. The problem must be the custom EPROM I ordered from PedalPCB, which should have had 'Blackface...

Thanks for the recommendation and info. I'll check again, but I am sure I had +3.3V to the common of the decade switch and checked all continuity. I don't recall checking all the combinations, so I will check that.

I appreciate your recommendation! I performed a pin-to-pin short test and there were no sequential pin short circuits, except as designed (pins 11 & 12, pins 24 & 25). I also performed a comprehensive continuity check (gently) from the top of the pins (not the pads) to the prior / next...

I stand corrected. Reviewing the circuit, it is a rudimentary way of tightening the Q and it shifts the frequency band a bit. I am used to the 'gold standard' of parametric EQ, my Furman PQ3, which goes about it in a more effective way. Appreciate the correction!