This circuit uses uncommon Texas Instruments components today. The circuit is from an American documentation. Transistors are commonly used PNP. The display is 7 segment multiplexed.
This circuit also makes use of a field effect transistor (JFET) which can be the BF245 and has an...
This Hartley oscillator can be used in tests or as a signal injector. The transformer is the type...
This circuit is from a 1981 publication. The DC supply can be made with voltages from 6 to 12 V...