This sequential tone generator circuit was found in the July 1980 issue of Radio Electronics magazine. It uses well-known integrated circuits. The tones are generated by programming resistors.
I got this circuit from an English magazine from 1977. It can still be easily assembled, as the...
This two-phase stepper motor circuit was found in an old documentation using an operational amplifier...
This circuit can generate pulses whose width is controlled in the 100k potentiometer and the...