We found this TTL power supply circuit in the December 1972 issue of Radio Electronics magazine. The circuit uses a 1 A transformer and the 2N3055 transistor must be equipped with a good heat sink.
This circuit uses a JFET CA3140 operational amplifier to convert a low frequency sinusoidal signal...
This commercial radio for the AM band was sold in Japan in the 1960s. The circuit has an IF of 455...
In the figure we have a simple way to produce tone in a piezoelectric transducer. The frequency depends...