[sdiy] for those about to clone the Oberheim Minisequencer...

[aankrom]

Thinking of cloning the Oberheim Minisequencer? I am among you. I have 
almost all the parts even. I was just wondering if anyone had done it. A 
few things come to mind: can you use CA3140's in place of CA3130's? I 
have two CA3130's, but I only have two. NTE says they match, but they're 
wrong. I seem to recall reading that you could make a 3140 do what a 
3130 can do, but not necessarily the other way around, mostly do to 
power supply limitations, I think. Which in this case would be good, 
since I have plenty of CA3140's. With precautions, couldn't you use a 
4017 instead of a 4022? Both Johnson counters (always makes me laugh), 
both can count up to at least 8. You can make the 4017 reset before it 
tries to count to 10.

After much careful poring over this schematic, I must say, I am 
impressed. It won't be an easy build, but the design is very clever, 
especially the way it quantizes for two parts. I don't need super 
accuracy since I'm just going to use it as an arpeggiator and maybe a 
crazy filter controller. Maybe both at the same time!

Just wish I had 16 B50kOhm pots. The 8 coaxial pots in the original 
would be awesome. I do have enough B25kOhm pots. Is this too much of a 
difference to work?

I've had a hard time figuring out the switch configurations too...


AA