Next up on my list of winter pedal projects was the 401K, which I just completed. This build specified some resistor values that I didn't have (27k->22k, 56k->47k or 68k, 390k->360k, 4M7->2M), so I had to make some decision about what matters and what doesn't when subbing in other values. Also, the pcb is built for a bunch of 1u electrolytics but I managed to use 1u film by bending one leg on each. It all seems to have worked out OK as I'm very pleased with the way the pedal sounds and it seems to perform just like the Keeley 4 knob does in the many reviews online. I don't really care for the Clip function but the other controls all do useful stuff.
The offboard wiring on this one went very quickly as I'm now getting pretty good at using Blu Tack to hold stuff where it needs to be for soldering - highly recommended.
This build worked at second attempt; at first try when plugged into the Protoboard it was silent when on but ok on pass through, so a reinspection of the soldering showed the leads of two adjacent transistors connected by a solder blob when they shouldn't be, so one snip and all is well.
I put this one in a silver box - of course - but imagination failed me when naming the pedal so 401k will have to do.
The offboard wiring on this one went very quickly as I'm now getting pretty good at using Blu Tack to hold stuff where it needs to be for soldering - highly recommended.
This build worked at second attempt; at first try when plugged into the Protoboard it was silent when on but ok on pass through, so a reinspection of the soldering showed the leads of two adjacent transistors connected by a solder blob when they shouldn't be, so one snip and all is well.
I put this one in a silver box - of course - but imagination failed me when naming the pedal so 401k will have to do.
Last edited: