The circuit presented was suggested by the National Semiconductor's Linear Applications Handbook of 1994. The circuit does not need a symmetrical source.
Found in an Electronic Design from the 90's, this circuit uses common components. The circuit is...
When the sensor receives light, the relay closes its contacts and remains so even after the light...
This circuit produces pulses of 90 V at intervals that can reach 5 minutes. The circuit is from a...