This 1974 circuit uses two 555 integrated circuits in a very traditional configuration. The circuit can be powered by voltages from 9 to 12 V and for greater volume an amplifier stage can be added.
a This circuit was obtained from a 1978 Practical Wireless. It causes a low-power 1.5V lamp to...
This game consists of a variation of the Nerve-Test with the difference that errors are indicated...
This Power supply is intended to Power small loads with currents up to 30 mA. The voltage depends...