This circuit that converts voltages from a battery into high voltages for tube circuits was found in Radio Electronics magazine from February 1960. The transformer is of a special type.
Found in a magazine from the '90s, this circuit uses an integrated circuit from the era that is...
This circuit, found in documentation from the 1990s, uses a common 7-segment LED display. The...
This circuit provides precise signals of three frequencies, using CMOS technology. The integrated...