Found in 969 documentation, this circuit generates sweep signals from 1 Hz to 100 kHz. The components used are from the period, and equivalents can be used.
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...
Found in an old Popular Electronics, this circuit warns when a remote lighting system is not...
This generator is more complete than the previous one, being able to generate pulses as indicated...