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 circuit was found in a Popular Electronics from 1991. The transistor could be the BC548. The...
This circuit activates a relay with a frequency signal determined by the adjustment components. The...
This circuit for frequencies from 1Hz to 100 kHz was found in the June 972 Radio Electronics...