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.
This interesting idea was obtained in a 1982 documentation and can be used for special effects in...
This is another of the many circuits we have with the 8038. The circuit is from the Radio...
This LC oscillator was found in English documentation from the 1990s. JFETs may be general-purpose...