This is a collection of stuff that I did a long time ago. It is going to take a while to fill this in, because as I found out this first night, scanning documents is not easy.
This is a circuit that I
had originally wanted to sell as a kit. Problem was, by the time
I finally got around to finalizing it, around 1983, I found out that
Paia
had discontinued the 4700 series synth, which took the wind out of my
sails
real fast. It never went beyound a breadboard test unit that I
did.
I should still have that around here someplace. If I find it, I
will
post a photo of that too.
Analysis of CA3280
Distortion comparison
3280 vs 3080
Gm as a function of
Diode Bias Current
Maximum Input Voltage
vs Id for constant distortion
Current Sources for
the CA3280
Voltage Controlled
Amplifier
Voltage Controlled
Glide
Filter Circuits
Sample and Hold
Circuit
ADSR Circuit
Multiplexor
Balanced
Modulator
This first one is a memory/IO expander. I used to sell these. It was my biggest mover (which isn't saying much, I sold about 16 of these). It has 1K of extra RAM plus two 6522 VIA's for I/O and timer functions. As of this posting, I have two blank boards left. They are up for grabs.
Memory Expander for
Paia
8700 micro computer.