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The 7660S seems to be the cheapest option and must tie pin 1 to pin 8 to boost to 35kHz. Same for 1044S, which is 50% more expensive. Doesn't matter which 1054 you get. Those trailing letters of the part number are operating temperature range. The C version should be cheaper for 0-70C...

Not to pile on... But never use a 7660. 1054 are perfect, just use them. But, you can use the 1044S and connect pin 1 (the boost pin) to V+ to use 45kHz oscillator. I've made the mistake of using 7660 in a muzzle and, with the raw guitar line connecting to it's key... Whine. EDIT: I see the...

I'm hunting for the R2 schematic or a reasonably priced used R2 I can trace myself... Thanks.

Just want to point out there is a fundamental difference between the two over-voltage protection circuits above. Mine is just a linear regulator and will continue to send out 9V under over voltage, which is what I wanted for my embedded Muzzle because I'm feeding 18V to my combo pedal for most...

Since I've had good luck in the past with the following link for modules, I decided to test it again. This time, one board has a TPA3118 and one had a TPA3130 (half the power output of a 3118). Getting modules you can be sure are real is a crapshoot. These both seem to be real but wrong version...

The link goes to only the chip. I couldn't find any modules.

FYI, I've found building these that active pickups through various preamp pedals can cause clipping at the input of my power amp circuits. I have this circuit at the input of the power amp circuits. The original design calls for 330k at R5 but I've had to reduce this to 130k for hot pickups...

Here's the one for my buddy Joe. He was the guy that first said a combo with all the best stuff would be awesome... This one has an AMT E2 in the middle and a sherrif (bobby) as the preboost. Update: I've since swapped in an O2 instead of E2. The O2 drive channel is really articulate and great...

Cool! My buddy told me I had to name the pedal. So I did...

I think I have the final combo pedal I want on my board. Instead of an alternate drive channel, this one has reverb in the upper right corner with Mix and Delay knobs using the FV-1 internal reverb algo. The rest is the same as before... AMT M2 in the middle, Prince of Tone lower right, Spark...

Could be either lack of earth ground or a ground loop. Your rig MUST have exactly one connection from earth ground to signal ground on your pedal board. Not 0 and not 2 connections. If you only have one power supply for all your pedals, that power supply must have a 3-pring earth ground and the...

Just for completeness sake... TTL inputs are also very different. The input is much lower impedance on pull-down (must sink current on the emitters of bipolar transistors) than on pull-up, which is high impedance. CMOS is high impedance input (gates of FETs).

Also, TTL is very strictly 5VDC while CMOS is more forgiving and could run at 9V.

I doubt it will sound the same because the output section of TTL logic is very different than CMOS. CMOS has symmetrical pull-up and pull-down. TTL is very strong pull-down and much weaker pull-up. So, they may sound very different.

Cool. This is really important. Most switch mode power supplies, especially cheap ones, do not have sufficient isolation of the mains power and the output. A solid earth ground is the only thing protecting you if there is a failure in any of these power supplies that could short mains to the...

By the way, your TPA3118 board is a fake. That's not a TPA3118. Real ones have 32 pins. Yours has 28. I've gotten the same fakes and the fakes have a lot more hiss than real ones but aren't bad sounding.

You must have exactly one earth ground connection to the ground (shield) of your guitar rig. Not zero and not two, which makes choice of power supply important. If your 9V power supply is earth grounded and connects the negative rail of it's 9V output to earth ground, then the power supply to...

I just found this little coded rotary switch on mouser and ordered some. Also tweaked my PCB design to use it and need an excuse to order a batch. Is anyone interested? I've already built enough of the original boards that I don't need them with a rotary. But, it's so cheap to order 10...

One more module for now. This is a pre-boost distortion module that can implement Bobby, Cetus or John from PedalPCB. I used DIP-8 for the op amps on this one to try out alternates. I like 4580 in distortion pedals instead of TL072. At PCBWay...

OK... The mother of all the modules. The full AMT M2 board. This will actually fit in a 125B as a stand-alone but it's purpose it to serve as the foundation of a combo pedal. The board can support the M2, E2, C2, B2, and K2 (and now O2 as well). I have to figure out how to have multiple BOMs at...