This long interval timer was found in the September 1976 issue of Radio Electronics magazine. The output can be used to control a relay. The circuit achieves timings of up to 14 hours.
In the figure we have the circuit of a millivoltmeter with operational Amplifier using a TLC271...
This receiver was found in a Japanese publication in 1967. The circuit uses germanium transistors and...
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...