Found in a 90s Popular Electronics, it serves both TTL and CMOS logic. The injector can provide 10 kHz or 100 Hz signals. The circuit drives a transducer and two LEDs.
Found in a magazine from the '90s, this circuit uses an integrated circuit from the era that is...
We found this circuit in Motorola's 1993 Linear Interface ICs. The power supply does not have to...
We found this sophisticated timer with several functions in a 1993 publication. The circuit can be...