The circuit shown indicates voltages from 10 to 14 V used to monitor automotive voltage. One or two LEDs light up depending on the voltage.
The sound produced by this circuit, from a 1978 publication, depends on the humidity between the...
This circuit was found in a 1977 American manual. The integrated circuit is from the time....
This small automotive NiCad battery charger uses only passive components and has the number of...