Recent content by phi1

Studying the Joyo American Sound circuit more, I realized I wasn't quite able to nail down what the first few stages were doing, but it looked like some filtering in the audible ranges. So I drew the whole Joyo in LtSpice, GAIN at 0, all the EQ/Voice knobs at noon. BLUE: -preamp - the first...

You shoudnt be losing any dry volume, basically 2 unity gain inverting op amp stages (basically 47k in line, 47k feedback = gain of 1). With treble boost on the first stage and treble cut on the 2nd stage). You could remove the 6n8 capacitors. (No filtering) to simplify and then check the...

I find the opamp clipping makes the sound more bassy and sludgy, even when followed by diode clipping at a lower threshold. This can be compared by running at 18v instead of 9v, so the op amp rails don’t clip.

If you have (or make) an audio probe, you can check for sound going in and coming out of the FV-1 (pin1 in, pin28 for out).

A friend dropped off a Frontman 15G for repair. No LED or sound on power-up. I wanted to try it, knowing full-well it's not a financially wrothwhile project. I have a lot of memories with my old frontman from middle and high school, learning to play electric guitar on it. Also, the input...

This is a miniature Class D power amp. It is comprised of a modded TPA3118 board from amazon, and an AMZ mosfet booster circuit. Powered with an old laptop charger (19.5V, 3.5A), it is quite loud and sounds pretty clean. There have been many threads on this forum about others' builds, so I...

I think my post 7 is still the cleanest implementation. You’d breake the signal path after R15 of each board and route those switches. I could draw it more clearly on the schematic. In this case, in parallel mode, IC2.2 of the lower circuit mixes the three signals at once (dry, delay1, delay2).

TL072 minimum output load is 2k ohm. So with your R6 (1k) acting as mixing resistors, I think that’s at the limit. If circuit A is at zero output, then circuit B sees 2k ohm load into GND, essentially). So we’re right on the edge of what’s allowed. I’d say bump those R6 up to 10k, and the R22s...

So if you break the delay path (switch before or after R15 or C14), the delay sound can’t get to the mixer (IC2.2), so you’ll just have analog dry. If you use a stomp to cut the delay, then you’ll have buffered bypass instead of true bypass. But I think it’d solve the oscillation feedback...

Soft switches to an ATTiny24, which controls all the logic and uses relays as the switches could work. Otherwise I think the main idea could be that instead of the stomps being try bypass, they just cut the delay signal By the way, for parallel, how are you mixing the signals? Just tying the...

Nice! Probably more effort and study than the original shamrock mod. I thought part of the point was more volume boost with the lower 27k resistor. But you got equal volume going even lower. So I guess there’s a peak volume as you adjust R16?-

In my build, the dry is all analog. It's basically identical to the seabed dry path except: -I added a non-inverting buffer stage first (the inverting boost stage doesn't have as high input impedance... may not matter since delay is usually later in the chain so you probably have a buffer...

For this build I used the FV-1 Only for generating repeats, and rebuilt the rest of the circuit (filters, feedback) in analog. https://forum.pedalpcb.com/threads/deep-blue-delay-simulation-fv-1.19627/ Not sure how much it helps, but a single Fv-1 could handle the repeats for both delay lines...

Here’s from the NOTAKLÖN page. There is a slight boost and mid bump, but I take issue with the description of the additional hard clipping. The LEDs shouldn’t clip or change the sound at all since the Ges (or Schottky) clip at a way lower threshold. Besides Robert directly tracing the...

Ah! That 100ohm resistor is dropping your voltage! Most Klon pcbs don't have that. Not sure why Robert added it, I think he re-worked the power section to protect for both reverse polarity and overvoltage (like if the user plugs in 18V, normally it would fry a klon, but in this design the Zener...