CV Control of Looped Cassette Playback
3,136 views · Published 15 March 2017 · 5:01 · Indexed 3 October 2026
Channel: Jason Hotchkiss · 2017 · Science & Technology
http://hotchk155.blogspot.co.uk/2017/03/cassette-player-hack-cv-pitch-control.html Just a quick experiment controlling the playback speed of a cassette player by CV! I removed the erase head (allows overdubs and seamless looping) and used a answering machine endless tape loop. Just recorded some orchestral music from the radio. A PIC microcontroller reads the CV in (or voltage from control pot) and PWM's a 70Hz square wave fed to base of a TIP117 PNP transistor in series with the motor. The circuit is powered off the motor supply so is powered only during play/record. It can slow down the tape but not speed it up.. yet Korg SQ-1 used to sequence the CV, with a Vermona Filter Lancet triggered from the SQ-1 gate and a EHX Memory Boy analog delay for some feedback fun. I'll blog with the schematic soon!
