This circuit found in a 1964 US publication reverses the signal level by providing 9 to 0 V outputs from 0 to 9 V signals. Transistors may be equivalent.
This simple two-transistor FM transmitter was found in the November 1991 issue of Radio...
This circuit was obtained in an Electronic Design from the 90s. The circuit uses transistors from the...
We found this circuit on an Elektor from the 90s. The frequency is given by capacitor C1. The...