This circuit is from a technical documentation on the National Semiconductor LM3909. The tripping transformer has a 1:1 turn ratio and the circuit is powered with 5V.
When the input of this circuit goes to high level, the LEDs start to flash alternately. The...
This circuit already uses an integrated circuit from the time. Note the different encapsulation of the...
This power charger was found in a 1990s issue of Popular Electronics. Integrated circuits must be...