The frequency of each note depends on R2, which must be replaced by a keyboard. The circuit is from Radio Electronics from April 1980. The power supply is 9 V for the amplifier used.
Found in a 90s Electronic Design, this circuit produces adjustable pulses that start after an...
We found this circuit in an English documentation from 1995. The components used are common...
This short circuit protection circuit is found in an old technical documentation. The circuit can...