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.
SST LLE Series Liquid Level Sensor Switches Available through Mouser Electronics, these solid...
This simple unregulated power supply was taken from a December 1970 Radio Electronics magazine. The...
The Micro-Lock line of Molex connectors can be obtained from Mouser Electronics. These connectors...