Rare DIY kit components

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You can now order some rare parts for Erica Synths DIY kits!

K 140UD12 - Versatile programmable operational amplifier used in the original Polivoks VCF. 
KR 198NT1A - Matched transistor IC, used in the Polivoks VCO. 
KR 551UD1B – Operational amplifier used in the original Polivoks VCO. 
ATMEGA328-P – preprogrammed microcontroller for Erica Synths MIDI-CV module. 
AS 1100CK2- monolithic sample-and-hold (S&H) circuit, controlled by signal LOGIC, stores the instantaneous values of the input signal and for a certain time maintain a  constant  DC  voltage at the output with high accuracy.