Found in a 1965 Electronic Design, this circuit produces a signal with the waveform shown in the figure from an input pulse. Components admit equivalents.
The circuit shown is suggested by National Semiconductor's Linear Applications Handbook. The base...
This circuit uses a pickup coil to take the signal from a telephone line without contacts. The circuit...
In this circuit, the transistors are NPN for general use and the phototransistors can be replaced by...