This circuit detects changes in the active cycle of the input signal. The circuit was obtained in a 1966 EEE. Transistors are general purpose types of the time.
The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by...
This battery charger is suggested by National and has a switch that turns it off when the battery is...
This circuit reinforces signals in a frequency range between 1500 and 2000 Hz for use in...