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No problem about the DMM. Now we need to figure out why the voltage is low. R101 is 4.7k and R102 is 5.6k, that’s a total of 10.3k. R102 should drop a little more voltage thanR101, 5.6/10.3=.54, .54X8=4.3. So your voltage between 101 and 102 should be 4.3V. You have 3 volts here, and since pin 3...

That's OUSTANDING! One of my favorite things is to build the classic circuits, using as many as the correct parts as possible. Let me know how this sounds. I recently came across a bunch of old caps and there was one 50n cap in the bag. Its an old ceramic cap but its built sturdy so I'm looking...

There is really no difference between 50n and 47n. The box film caps are normally 5% or 10% tolerance. So a 50n cap with a low value but still with in 5% is 47.5n. And if the 47n has a high value it could be 49.3n. If the caps are 10% then the overlap is even greater. And if you calculate the...

Either one will work for the volume pot. C17 and the pot do form a high pass filter, the A50K will move the lowest frequency from 28Hz to 14hz, not much of a change and these frequencies are below the audible range. Also the A50K will give you the same feel on the control because of the taper...

Thank You! That would do it, I figured R6 or R7. That would keep the bias voltage from Q1 base.

She better if she knows what's good for her! :ROFLMAO: :ROFLMAO: :ROFLMAO: (That is a Joke!) She is the one who got me started down this rabbit hole of a hobby, so she is pretty cool in my book!

I just checked mine, the voltages are close to what GGG says they should be. I was going to suggest looking at resistors on the feedback path from Q2 emitter to Q1 base. So what resistor was it, I'm curious.

D3 and D4 are clipping diodes, the anodes are opposite each other, if you used germanium diodes the forward voltage on them is low so they may look like a short, as long as you have them installed correctly according to the board they should be good.

No Problem!

the 1N4148 is a direct replacement for the 1N914, so no problems with that. The A250K is a different taper from the B250K. On the A250 the first 75% or so of the rotation will have a small affect on the sweep, but the last 25% or so will have a lot of effect. May make it harder to control...

Really Nice job on the pedals and the box!

@Barry , Thank You!

Built this one for my kid. She wanted a synth effect for her guitar so here it is. She really liked the EQD version and the graphics, so I pushed the envelope a little. Oh well sue me. This thing is CRAZY! I had to test it out don'tcha know. It fired up right from the get go. Sounded like a...

Looks Great!

Thanks,! It's not etched, it's a water slide decal.

Nice Fuzz circuit! I've been looking for a fuzz circuit with a little versatility and this one has it. The voice and tone knobs are nice and give a nice range of tone. Needed to work out a few graphics idea for a parallel build I did for my daughter. A friend I work with had a box of electronics...

Understandable. Trying to sub polarity sensitive caps for non-polarity caps can be tricky. One or two, easy but there's a bunch of 1uF caps in this circuit. Another thing, if your mail is anything like mine, if you order today, and also order after Jan 1st, they would arrive at same time!, so...

The op amp isn't biased correctly. You should have about 4V on all pins, except pin4 = 0V, and pin8 = 9V. This voltage is set by R101, R102 and C101. It is applied to op amp at pins 3 and 5. Check voltages on R101 both sides of resistor.

An easy way to figure the caps, but not always 100%, is to de-solder the cap, power up the circuit and measure voltage across the pads of the missing cap. One way the it will be positive and the other negative. When its positive, where the red lead is, that should be the + lead of the cap.

I was an electronics technician in the US Navy. After getting out I stayed in the field and saw it change from through hole to SMD components( I hate SMD BTW). The equipment I worked on had nothing to do with audio, so the audio side is recent. But electronics are electronics. How I got into...