In the figure we have the configuration of series regulator protector suggested by Motorola in 1968 documentation. The transistors are of the time, being able to be used modern equivalents.
This circuit was obtained from an Electronics World of 1968. The transistor may be general purpose and...
This Texas Instruments circuit uses a phototransistor to fire a TTL trigger port. Other...
This circuit can generate signals in the audio range between fraction of hertz up to approximately 10 kHz...