This circuit was found in a 1964 Electronic Design. The components are of the time, and modern equivalents can be used. Note the multi-emitter transistor.
This circuit was found in a Popular Electronics from the 90s. The circuit uses TTL technology and...
This circuit was obtained in the manual of the used integrated circuit. Equivalents may be used...
This circuit simulates a UJT, with two bipolar transistor. Frequency is given by C1 and P1...