Recent content by temol

The 1N4007 diodes should have different numbering. They are now D3 and D4, duplicating the LEDs.

@djathey, @keyth72 - big thanks! :)

@keyth72 - I could not find any info about function of the dipswitch. thanks!

Second interview with DG.

A friend sent me an EBS Dynaverb pedal for inspection. It's a digital (probably DSP) reverb. It worked flawlessly for a long time, until suddenly some digital noise appeared. I looked inside – there were no signs of damaged components (the capacitors looked fine), and no signs of water damage...

"From Monday, 25 August 2025, no shipments to the USA due to changes in customs regulations". Quote from German webstore (synth-parts). I wonder if this is an exception or will soon become a more common sight.

It is good practice to separate IN and OUT. Maybe not that much as on my example, but in-led-gnd-out should be enough. Why such thin tracks? Why ground pour only on the bottom?

Buy smd version of the J201 - MMBFJ201. they are cheaper and more reliable. You don't even need daughterboards for them. Chop Shop has solder pads for smd transistors. Check PPCB (3$ for 5 pieces), Mouser...

In my basement :) . 100% DIY.

How do you plan to power the opamps? You either need a symmetrical power supply or a reference voltage from a voltage divider. GND... It depends on whether you have a symmetrical power supply or a reference voltage (Vr) But... Take a proven hi-gain circuit with opamps, add a few things...

Can you show an example schematic with such a tone stack?

You need to consider two things: volts and amps. The higher the V, the higher the output power. The module supports a maximum of 24V, and then it has the highest power, assuming the lowest allowed speaker impedance. I 'm not sure what the minimum is because I've seen different values: 2 or 4...

Let's hope that oil paint won't slow down drying time.

Well, not exactly... there will be about 9V there, so if you want to try it, do it before C15. You need a DC blocking capacitor. So it should be "Mofeta preamp (starting from C15)". I didn't notice it before; it probably seemed obvious. My mistake. If you want to use it as a standalone circuit...

The paint is quite thick, and the manufacturer recommends a brush or roller. There's no mention of spraying.