This circuit was found in a 1967 Delco Radio documentation. The circuit has an input voltage of 250 V and the load current is 2 A. The transistors used are from that time.
This TTL oscillator uses an old TV crystal, having been found in an American publication in 1976....
Two NAND gates are used in the configuration shown here to perform as a monostable triggered by...
This circuit trips, changing state, when the input voltage exceeds a value determined by R1 and...