This 9 V battery eliminator was found in Radio Electronics magazine from June 1966. The transistor is of medium power and must be equipped with a small heat sink.
This RIAA equalizer preamp was found in a 1990s schematic. The transistors are an old version of...
This circuit uses two LEDs to indicate the state of a battery, the voltages at which they...
The bridge diodes of this circuit, found in a 1967 publication, are according to the motor...