Recent content by lowpitch

That sucks. I'll have to stock up on 4305.

You're right, so is the xppower. I didn't even check that. Then question to the OP, which exact converter are you planning to use for regulated output here?

This is the correct one: https://www.mornsun-power.com/html/pdf/B1209S-2WR3.html I would avoid the xppower version. Not only lower output current capability but also much lower max. capacitive load.

The ground pour is pretty cut up, maybe enough to cause issues? Return current paths for the charge pump are pretty long and travel right next to the high impedance input jack trace.

Parameters are much closer to 5457 than J201, so they may not work well in every circuit as a sub for J201.

Possibly just foolproofing against someone doing something stupid, like plugging a tube preamp with much higher voltage swing than the TL072 can handle into the output of an effect.

Adjust the voltage divider formed by R7 and R6. I'd start with R6 = 10K and adjust up or down for less or more volume cut. R7 can stay. If you don't want to desolder R6 you can put a resistor across board output and ground. R6 will then be in parallel with this new resistor. Keep in mind the...

I'm simulating this in LTSpice as part of a larger circuit and while AC analysis shows the wanted behavior, transient analysis does not. Relevant part of the circuit, excuse the messy drawing: The capacitance multiplier around C54 is supposed to replace C27 (not connected here). At pres1 = 1...

https://www.mouser.com/PCN/TDK_Discontinuation_of_MKT_stacked_capacitors_from_the_B32520_B32521_and_B32529_series.pdf Like Kemet, TDK is now also discontinuing some of their large value film caps with pedal friendly dimensions. Their 2.2-4.7 uF caps were 7.8 x 7.8 mm for example with 5 mm lead...

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.