This circuit was found in a 1975 documentation. Current general-purpose transistors can be used, and the power is supplied with relatively high voltage. The gain is 30 dB.
No information was given on the inductor enrolled in the common core of this circuit two years 80. The...
This photoelectric circuit was found in a 70’s Ferranti's documentation. The circuit uses an...
Originally suggested by Popular Electronics to control Christmas lights, this circuit can...