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It works! See here for the background: Plug-n-Play Buffered Electrical Bypass Using CD4053 and Momentary SPST. In short, it's a dedicated circuit and PCB that does two things: (1) always-on buffer, and (2) electrical bypass via CD4053. This is essentially how Boss pedals do buffering and...

In this case I don't want to cut the wires off the pot, at least not all of them. Two of them are actually the shield braids from the pickups. The pickups' "hot" wire is shielded. So the wire comes from the pickup cavity, and at that point it's closest to one pot. About two inches of the...

I have a Circuit Specialists CSI-Station1A, which they don't appear to sell any more. It's a 40 watt unit. I bought it in 2011. Link to the manual. The tip is probably as old as the unit itself, maybe it's time for a new tip?

Not directly a pedal question, but I know many around here have changed their electric guitar's pickups and/or pickup wiring. I went to simplify the wiring of one of my guitars (change a 5-way pickup switch to 3-way). The stock wiring basically uses the metal case of the pots as a ground bus...

Is there anything special about the MPSA13 transistors in this circuit, other than they are Darlington transistors? More specifically, could each be replaced by a pair of commodity BJT NPNs (e.g. 2n3904 or bc549) configured as a Darlington pair?

A couple weeks ago, I started a thread with the same title over at DIYstompboxes: Plug-n-Play Buffered Electrical Bypass Using CD4053 and Momentary SPST. I want to create a buffered electrical bypass scheme activated by a momentary SPST switch (similar conceptually to what is found in most Boss...

What are your thoughts on putting C1 in the opamp's feedback loop, or with a small series resistor after the opamp's output? As you say, the original function (RF filter) is nice in theory, but could have tonal effects when considering a generic use-case (e.g.. pickup loading). IOW, buffers...

I use the LP2950 as a 78L05 drop-in replacement. Not quite as nice as the AP7375, but definitely better than 78L05, and readily available in through-hole TO-92 package.

Thanks! It's such a luxury to be able to have a small, custom PCB fabricated and shipped for $5 or so. I honestly don't know, but that's certainly a reasonable guess. That's the only deliberate change from the previous Amethyst I built. But there were other random changes that shouldn't...

This is my second Aion Amethyst build. Here's my first. My wife got me the MN3005 and the CT3101 from @Cabintech for Xmas. My previous build used the (much cheaper) 3205 BBD. The main reason I was interested in the more spendy 3005 BBD chip is that it can run at a higher voltage, and I...

@Chuck D. Bones, what is the purpose of R9? In the most recent schematic it's 470k parallel with the C500k treble pot and R7/7k5, and in the earlier schematic, it's 100k parallel with the C100k treble pot and R7/1k5. Isn't the net effect of R9 to essentially half the treble pot value? IOW, in...

The build and artwork looks great! But the My Little Klony pun just takes it to the next level! Thank you everyone who comments and re-bumps this to the top of the build reports section - brings a smile to my face every time!

That's a great rock and roll sound! All the guitars were straight into the amp, no effects (other than a little delay on the leads)? Does that also mean no post-recording EQ as well? How loud do you have to turn it up to get that tone?

Would I do that by feeding the pedal a generated signal, and then looking at the output on the scope? I’ve only used the scope once, so I’m not well versed in its use. I also have a computer audio interface… there’s presumably software for measuring distortion…

I actually do own a little cheapie oscilloscope.

Thanks Dave. I went back and checked everything. Vref is indeed half vcc. I didn’t change any other parts (unless unknowingly by accident). I wasn’t able to duplicate the issue, at least not the way I remember. I did tl072 with 5532, 2x tl072, OPA and 5532… they all sounded the same. I could...

The Lollar/Cast Iron is quite literally a Timmy (v2 I think) with the active mid boost added (and the spare opamp used as a buffer at the end of the circuit). The connection between the clipping diodes is part of the Timmy mojo IMO… I’m pretty sure the consensus is that, theoretically it...

Edit: ignore my comments below. I think I imagined a difference that wasn’t there. There is some distortion, but after playing with this some more, I actually think it’s my amp’s input being overdriven. As @Chuck D. Bones says, the OPA, 5532, and TL072 should all work the same in this...

@Chuck D. Bones - what are your thoughts on BJT vs JFET for Q1? I see the Animals/Skreddy circuit, and your initial design, used BJT, but then you switched to JFET.

I'm fortunate to live on a street with several people who play instruments and like to play in bands. So every year, a few other guys and me get together as a band to play our annual neighborhood block party. I made this Paragon as a gift for my friend/neighbor (who's a great player!). He...