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Those MOSFETs can drive much more current than the 555, although this may not matter much. The TQ2-9V for example draws just 15.5 mA when energized. Other than that, this whole circuit should draw overall less current than a 555 circuit, and to me it's just a cleaner approach. I think this may...

You could use a CD4013 for example like so: Q output then goes to the gate of a MOSFET. Source to ground, drain to - power pin of the relay. When Q goes high, the MOSFET will turn on and act like a switch to ground turning on the relay. You just need to be sure the threshold voltage of your...

Multiple feedback filter was my missing link. It makes sense now. Thanks!

Thanks for the reply but I'm more interested in understanding the filter by itself and why it results in the above frequency response. It just looks kind of random to me but there must be some logic behind the values and how the peaks and troughs are calculated. I can't imagine some Marshall...

Aion FX has a schematic: https://aionfx.com/app/files/schematics/king-tone-soloist-trace-schematic.pdf I guess these are the tants in the tone control circuit, so I wouldn't change them. It may not sound bad but certainly won't sound as intended. As for the 82 uF, it won't matter.

Yes. The op amp is biased to ground via R9. Op amp output impedance is negligible, so that's where the output is going to sit at as well unless you add a coupling cap before the bias resistor connected to -12V.

Yes. Your sine wave is an ideal voltage source referenced to ground. It has zero output impedance and it's connected to the same node as your bias resistor which is not zero. So that node is forced to sit at ground no matter what. Either reference your sine wave to -12V as well or add a coupling...

You need a coupling capacitor before R1, otherwise the gate will not sit at the correct voltage.

Can those germaniums actually do anything configured like in the schematic? When one is forward biased the other is reverse biased, so it's essentially an open circuit. Reverse breakdown voltage should be much too high to come into effect for them. You can swap the 100 pF for a higher value to...

The Rangemaster circuit looks sound. VOL1 is kind of superfluous because GAIN1 does pretty much the same thing, but other than that it should work. Maybe a mixup with transistor pinouts?

True. C100 is before the charge pump though, so 35V is unnecessary here.

It's only going to see the 9V from your power supply, so anything rated 16V and up is fine.

Do you have continuity between power ground and ground on the breakout board? Can you make a photo of your DC jack wiring?

Same. My drilling actually got more precise and faster once I stopped using the clamp on the drill press because it's way easier to make small adjustments on the fly.

Cool project! How about a demo? :cool: The SS-140C has been on my to-do list for a couple of months now, but unlike you I'm a lazy slob so I got nothing so far except for LTSpice simulations. I don't think the high/low input switch is correct in your pedal schematic. The switching jacks in the...

The Marshall Valvestate VS100 has a "Power Dimension" switch. It seems like the circuit is supposed to emulate some of the characteristics of a tube output section. There's a phase splitter, JFET gain stages for the two signals to simulate phase inverter and/or output tube distortion, a...

It's more to prevent the transistor from falling out of the socket. I've soldered transistors directly into their sockets before when I couldn't be arsed to remove the socket. It's fine and doesn't require much heat and solder.

I've had good experiences with Aion FX overall. The layouts are nice and the boards are high quality. Some hate the daughterboards, I personally don't mind. Give them a try :)

This was drilled by hand. Relative spacing between the potentiometer drill holes is the same as the drill template but it's vertically offset overall.

Nice, looks clean. I like the black on raw aluminum aesthetic.