Found in a radio amateur magazine of the 1980s, this circuit uses components that can still be found easily. The circuit is for NiCad batteries.
Found in an Electronics World of 1968 this circuit has a 40 to 12 000 Hz bandwidth providing a 1.9 Vpp...
The integrated circuit used in this configuration is the 7400 and the maximum current of a few...
This circuit has a duty cycle of 50%. We found it in old English documentation. The center...