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.
In a transmitter sequencer we have a high input impedance and a low output impedance. The voltage...
This basic configuration aof a touch switch controls a relay. Power supply can be 5, 6 or 12 V...
This circuit amplifies signals from low impedance sources as microphones, transducers, etc. For...