This circuit was found in Mullard's transistor application manual from 1960. More modern transistors can be used. The zener diodes used have the indicated voltages.
The circuit shown in the figure is suggested by Maxim (www.maxim-ic.com) and makes use of the...
This 100 kHz crystal oscillator uses 7404 to generate square signals. We found it in a Popular...
We found this time base circuit in a timer project from the August 1972 Radio Electronics...