This circuit is from a Radio Electronics from March 1960. The generator works with a 22.5 V battery, generating good intensity signals determined by the LC circuit.
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...