We found this parking light circuit for automotive use in a Texas Instruments optoelectronics documentation. The Darlington transistor can be replaced by others in the TIP line.
This very simple oscillator, with only one transistor, was found in a Japanese magazine in 1967....
This simple bridge circuit can be used for impedance or resistance measurement using a high...
This circuit has the intensity of the signals controlled by the light that falls on the sensor....