This circuit was found in Radio Electronics magazine from October 1964. The circuit uses two transistors of the time that require a supply voltage of 9 V. Consumption is 2.5 mA.
This circuit has an interesting application. If a device with the selector switch in the 110 V...
This simple radio circuit was obtained in a Japanese publication in 1967. The circuit uses...
This circuit was found in a Popular Electronics from the 90's. The components used are common and...