This is the commercial circuit for the TRF-44 amplifier sold in Japan in the 1960s. The circuit provides a few hundred milliwatts and is intended to be used as small, battery-powered turntables.
Only the right combination of the positions of the 6 rotary switches of 1 pole x 10 positions of...
We found this circuit in a 1977 Radio Handbook. The lamp is the critical component, being 120MB at the...
This 1964 Electronic Design circuit uses a photo-FET as a sensor. The component is rare today. |...