This circuit is better than the previous one in that the control is isolated by a transformer. The transformer has 110 or 220 V primary and 6.3 to 12 V secondary with 200 to 500 mA current.
This circuit is from a very old publication, from the 60s. It uses germanium transistors from the...
This complete video game circuit was found in the May 1978 issue of Radio Electronics magazine. The...
Found in documentation from the 70s, this TTL circuit is based on optical sensors made with LEDs...