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I am working through the exact same thing right now! My build modified the 'Cepheid' to a 'Cesar'. I finished it a week ago and it was distorted with the Blend on '0' (no effect) and then it quickly went silent as I blended in the effect. My LFO LED was blinking and reacting appropriately to...

My favorite chorus would be considered a sub-genre these days, as it is a Lesile unit I salvaged from a scrapped Hammond C3 (pictured below). From what everyone may consider 'chorus', my favorites are Roland JC120 (which I am currently building a PedalPCB 'Cephied' into a 'Julia,' using...

No. More like or more of your 2N5089's were out of tolerance / bad. In my experiences and due to today's various manufacturers for ICs and transistors, the chances of getting an out of tolerance or defective part are rising. Many are using copies / clones of the etching masks, which only...

Yes. I edited my prior post to correct.

I suggest you set your true bypass stomp switching up like the ones shown on PedalPCB type builds. Check their Nobelman build documentations, page 4. You'll need to use a 3PDT stomp switch. For silent switching, R26 (150k) of the Andromedia schematic. has to be well connected between the...

The 2N5089 and MPSA18 are both general purpose NPN transistors, with virtually identical 'on' and 'off' specs. Additionally, those transistors control the compression ('Ratio') for LDR1, which acts basically like a volume pot which senses the AC signal intensity and leaks the signal to...

Internet search an imige of the IC to determine orientation (pin location), referred to 'pinout'. Set your multimeter to DC volts, and set the range to 20v or higher. Send the common (black) probe to ground and the measurement lead (typically red) to the pins being measured. All DC voltages...

IC1 pin voltages?

A few things came to mind from your description: 1.) C9 isn't properly connected to ground via R11 (10K) and is storing up too much DC voltage by, instead of keeping Vref A steady. Ensure those solder joints and values (note that the cap orientation looks good). 2.) Vref A circuit (you...

Q3 buffers Q2 from being influenced by the impedance of the output circuit. It could (or might not) have an effect on the tone or reaction of the fuzz generated in Q2. If you like the result, you didn't need it.

Did you measure the values of the resistors which make up the Vref for Q3? R11, R12 & R13? Additionally the polarity and solder connection of C9? If Vref is too strong or weak, Q3 becomes an 'on-off' switch. Vref should be close to 50% of Vcc.

I appreciate you including the schematic, as it was not available on the PedalPCB website. That is a overtly complex circuit for a basic indicator LED. I personally would skip all the circuit between the R4 and pin #1 / column #2 of the 3DPT stomp switch, solder a 4K7 resistor to that lug...

Remember that the stomp switch sends the LED cathode to ground (lit) or open (not lit). I am fairly certain that PedalPCB does not utilize a switched (+) on any of their designs. In studying your pictures above, I may have found the issue. You have the LED anode (+) soldered into the...

The circuit is finding its way to ground somewhere. I'd suggest testing resistance to ground, of the 'switch' lug of the 3DPT stomp switch starting with a high DVM range, like 2M. Anything under 100K resistance continuity of cathode to ground will probably get the LED to light.

1/4" are too small. 5/16th would work. Do you have a preferred source?

I built one and used it for guitar and bass. I am currently making one for my neighbor. My build thread his here: https://forum.pedalpcb.com/threads/median-compressor-spirit-of-1776-functional-testing-update.22639/ IMHO, it is already to go for bass guitar. Its blocking R-C circuits...

I've seemed to run dry on sources for M7 internal-tooth lock washers, for use with 16mm potentiometers, commonly used on pedals. Any suggestions?

From your pin voltages, it appears that your Vref circuit has the wrong resistors in the voltage divider (R12 & R13). I am going to guess that you installed a 4k7 resistor for R13 instead of a 47K. All of your RC4558 pins, except #4 (0 volts) and #8 (near 18V), should be around half of Vcc...

Lots of good answers. Mine is simplified: it is a passive 3-band EQ which takes the full-frequency signal and passes specific frequencies to ground, via the filter cap on the Vref circuit.

I went with NOS T092 types for the same reason. The first SMDs I soldered directly, would not bias.