I'd like to make a standard off the shelf five dollar cassette tape player slow down to half or quarter speed.
A tape player has a 1.7 volt two wire DC motor.
It seems that feeding it 1.2 volts will run slower but no more push..so it stalls.
I was wondering if I can pulse the full 1.7 volts real fast.....maybe at a few Hz.... so the motor has enough volts to push the drive belt but missing a beat here and there to make it move slower rpms.
We had a teriffic discussion on the old list about using pulses to slow down AC
motors with solid state relays to make the rollers go slower in laminators
we were doing heat applications of printed circuit boards and laser printer schematics.
I was wondering if that same logic could be applied to make a cassette tape motor run slower...but still have enough strength to push the tape.
The end use would be to tape morse code on the radio and then play it back slower for the new guys who don't understand fast morse code yet.
Any advice about what pulse rate I should target the circuitry around?
Rob KB3BYT