Simple Univox Minikorg 2 Issues
2012-07-17 by r andrew
Hello! I'm trying to track down the last two lingering 'issues' on my Univox Minikorg.. 1 - There is often (30-40% of the time) an audible click (or snap) when depressing and/or releasing a key. The click sounds the same even when the filters are totally closed, so it must be happening after that stage (probably in the VCA/envelope?). 2 - Only when the SUSTAIN switch is engaged, the oscillator can still be heard (very faintly) after a note should have ended (there is a persistent ringing of the last engaged note). Changing the filter DOES affect the lingering tone. This SUSTAIN switch connects POINT 17 to either POINT 13 or POINT 15. Here are the easy-to-read schematics: <img src="http://www.cykong.com/Synths/Korg%20700S/Images/Mini-Korg-700S-Schematics-Coloured.gif"> Also, to lower the minimum VIBRATO RATE, am I correct in thinking that I need to reduce the value of the 56k resistor at POINT 51? Thank you very much! - Robert