This circuit was found in a Popular Electronics of the 1980s. The microammeter may be the lowest current range of a multimeter. The antenna is telescopic.
This power source takes advantage of an old valve transformer that is no longer used and can...
This circuit was found in a National Semiconductor manual that is now a Texas group company. The...
This circuit simulates the call tone of a telephone. The transducer is a high impedance capsule, and...