Straight outta KiCad – a 4HP utility LFO based on Tom Wiltshire’s fantastic Electric Druid TAPLFO3 PIC.
I’m going to do another, larger version with more CV inputs, but a lot of the time I find I need a number of more basic LFOs – and that’s where this fits the bill nicely.
- TAPLFO specs:
- Clock sync with clock multiplier & x.5 divider
- Sixteen waveforms (two banks of eight)
- Clock out
- I added a rate LED, and +5/-5v CV control of “distort” parameter (see datasheet here) with input protection
Once I’ve got the boards back from JLCPCB and test built it and make sure it works, I intend to put the gerbers and the KiCad files online, under the same CC BY-NC-SA 4.0 licence Electric Druid release their work under.
OK, so a few mistakes crept in. I missed two junctions in the PWM filter section, left the footprint for the transistors on the surface mount version (I was initially going to make this SMD), and made a glaring error in the scaling circuit. But again, with a couple of wires here and there, it works.
I’m also going to change the pots for Song Heui tall trimmers – there’s not much room for four knobs in 4hp, and the trimmer toppers Thonk sell will work nicely here.
Off to do the revisions and order the new boards.
The new boards are built, tested and working. Going to build a number of these, as they’re so useful…
Here are the Gerbers and KiCad files, along with IBOMs for both boards.