This circuit is from a 1974 publication by Motorola. The unijunction may be 2N2646 and bipolar BC558 and BC548. The pulse duration depends on the capacitor.
This circuit generates a 5.3 kHz linear ramp with the indicated components. The 7555 is the CMOS...
This circuit was obtained from an American publication from the 60's. The transistors are...
This small short-range FM transmitter was found in a 1987 documentation. It is intended for the...