This simple clock can be used to generate signals up to 100 kHz, depending on the crystal. We found it in a 1967 documentation. Note the high supply voltage.
Suggested by Mullard in an old documentation, this circuit is based on a common phototransistor and on...
This is one of the many hysteresis comparator circuits the reader may find in this section and on this...
These circuits (with some changes) are parto f the sample banl of the Multisim 11. Simulated in...