[sdiy] ARP Pots / Sequencer

[Tim Parkhurst]

Hello Again,

Again I think I've proven that this is a great list. I got some great
feedback on my ideas. Thanks to all who commented. Here are the highlights:

1) Lots of response about the sequencer. Even with it's limitations and
quirks, this is a very popular piece of hardware. 

2) Only a few responses on the rotary pot adaptor. I think I'm going to go
ahead and do this one anyway because it will be a fairly simple piece and it
will find immediate use in several synths. I may also make a "double pot"
adaptor that would allow mounting two pots in the slider slot and allow
mixing both inputs (e.g., mix both saw and square from VCO 1 into the VCF).
This will require a little additional wiring, but I think it will be a nice
add on.

3) JH was very insightful and very accurate with his sequencer price
estimates. I have cobbled together a preliminary BOM for the sequencer
(including pots, switches, LEDs, trimmers, semiconductors, but NOT including
power supply parts, pcb mounted Cs and Rs, case and knobs) and so far I'm up
to about $160! I can see this getting to $200 without much effort. The
biggest cost items are pots, jacks and switches (about $100). Also, the
CA3086 transistor array ($5.18) and the MC1452 multivibrator ($3.42) are
surprisingly expensive. I think these could be replaced to save a few bucks.
Of course, these are new parts. If you could use surplus or had a good junk
box to draw from, you could save quite a few bucks. All told however, it
would be fairly easy to spend $400 by the time you got all the parts, a
power supply and a rack face panel. I still think this would be a fun PCB to
do (I'm definitely going to build mine with surplus parts) and if people are
still interested in a bare PCB with some documentation, let me know.

Thanks again

Tim Servo




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