This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but the high input impedance makes it useful for radio applications.
This shield with feedback to control the direction of rotation of DC motors up to 500 mA with...
This very high voltage (VHT)generator was found in a 1995 documentation. The transistors must be...
Found in a 1967 documentation, this infrared amplifier is intended for use in a Nipkow disc camera...