Found in Popular Electronics from the 90s, this 1.5 A power supply can supply voltages selected by a switch. The splitter resistors determine the output steps.
We found this circuit in an American publication from the 1970s. The MC1555 is the version of the...
This circuit for FET was obtained from a 1977 Radio Handbook. The input impedance is 150 ohm. The...
This is the receiver circuit for the CB13978B, found in the same 1977 Elettronica Prática...