This circuit was found in the 1992 Radio Electronics Handbook. It is used to test VCR recording heads. It can also be used for other purposes.
Found in a 1967 Electronics World, this circuit can use any modern equivalent FET. Observe the...
Found on 80's Popular Electronics this circuit operates at 455 kHz. The explorer coil is formed by...
Details of the coil of this two-transistor generative receiver were not given. We found it in a...