This low-power circuit was found in the March 1990 issue of Radio Electronics magazine. It consists of a tone control solution for portable turntables.
This transmitter has a good output power thanks to the amplification step with two transistors. The...
We find this circuit in an 80s operational amplifier documentation. The circuit applies to any...
This circuit indicates when the voltage of a 12 V battery is low. With changes, for example, the...