Suggested by an old RCA manual, this circuit makes use of the period components. Data for the transformer is provided in the original documentation from the 1960s.
This circuit may be modulated by a very low frequency signal, for example to obtain the vibrato...
This “people detector” with pyroelectric sensor was found in the April 1991 issue of Radio...
Using a BA1404 integrated circuit this small FM stereo transmitter was found in a Radio...