Found in a Philips publication from the 1970s, this circuit uses a DO040, which is difficult to obtain today. The circuit is powered by 12 V on pins indicated in the diagram.
This receiver is from a 1967 Japanese publication. The transistors are germanium and the output...
This circuit simulates a unijunction transistor with two bipolar transistors. We found it in the...
This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V...