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Hello, I had the same question some time ago for Q1 of the Sabbath Distortion. So I made a little transistor switcher with an on-on DPDT. The Collectors are joined in the middle on the stripboard and always connected. The DPDT switches Emitter and Base. It worked fine.

Good to know, thanks. Yesterday evening I replaced the four OPA1678 opamps in my Median with four TL072. I wanted to see if with a simple opamp-change I could reproduce the clipping noise from the recording. I tried with two different humbucker guitars, also switched the buffer on the tuner in...

The same clipping that bidurgi999 documented in the attached recording? If not probably best to open a new topic if needed.

No problem, great day to you, too!

You wrote that it doesn't matter what position the blend knob is in. Then I reckon the problem should be somewhere around the input or the output.

Could be. Or maybe a broken opamp. If you socketed the opamps that's probably easiest to try. If you have some other opamp lying around, like a TL072, just try it out if replacing any of the OPAs has a positive effect. Finding a potentially bad soldering joint is trickier. Probably best to step...

Yes, that doesn't sound good. Do you get the same when you turn the Blend knob CCW?

Does the LED light up when you turn the pedal on? I mean it sounds stupid, but I can't tell from the pics if you connected the 9V cable to the battery connector of the DC jack or the normal 9V connector (viewed clockwise the next connector after the big one for ground). There are no voltages...

Are you going directly into the compressor with your guitar, or do you run a booster or something in front of it? Active pickups or passive? Can you record the noise so we get a better idea?

Finally got mine! First impressions are good. Not the most squishy comp I have, but it does sound good and controls work fine. Very nice, compact layout! Can't hear any noise, really.

I just posted that link because I found it interesting in general, also as a showcase of how far some people are willing to go :) And I guess it's not easy to find with an internet search. For guitar pedals the MLCC caps I had mentioned one post earlier seem sufficient.

Sorry, didn't see this message until now. Honestly never tried. According to datasheet you can bring it up to 35k. That's the same as 7660S with pins 1 and 8 shorted. And you can get these to whine, too. We won't hear the 25k nor the 35k. What we hear is heterodyning, when two of these overlap...

LT1054 is still a charge pump and has ripple. I can get my Electrovibe to whine.

Here's a link from a few years ago where somebody looked into the charge pump noise and tried a lot of stuff and the extra filter caps killed the high frequency ripple: Link

Hello, if you got charge pump whine I suggest to put some 470nF MLCC caps at the input and the output(s) of the charge pump to ground. Works every time for me. Have a look at the aion Straylight and Ember. That's where I first saw people doing it.

I think I know what pedal you're referring to. I wouldn't buy it. It's bland and boring.

Alright, thanks!

Hi all, I've seen quite a few build reports on the Median, which makes me want to get one myself. Musikding has them in store, so I'm going to order one soon. I'm wondering if the original really had a trim pot or if it had a resistor instead. So, more of a question for Robert. If there was a...

Attached a pic with comments. I hope that it works out for you.

I'll have a look at the vero tomorrow. Just hold off for a day or two :)