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.
The circuit shown in the figure can generate signals of good intensity up to a frequency of 30...
This touch sensor, found in an American documentation on transistors, has gained 8 million times...
This is a complete version of the previous circuit, with several scales and two transistors, one...