We found this circuit in the March 1980 Radio Electronics magazine. The circuit used is the HA2400 released at the time. The power supply must be symmetrical.
This circuit of a publication from the 70's uses a different type of power that we had already...
This circuit, from Motorola's 1993 Linear Interface ICs. The circuit causes a lamp to blink at a...
This frequency corresponds to musical note C3. Frequency accuracy depends on the accuracy of the...