Found in Philips' 90s documentation, this small source can use modern transistors like the BD135 for TR4 and the BC series for the rest.
Found in a Hands On Electronics from the 90s, this circuit can be easily assembled today, as the...
I found tis circuit in na old documentation from 1958. The circuit uses germanium transistor...
This is the basic configuration of a CMOS 4027 integrated circuit as a flip-flop. The circuit can...