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 small transmitter with 2 transistors can reach several hundred meters using a 30 to 70 cm...
Although modern integrated versions exist, this 1995 circuit shows a discreet solution with common...
This circuit from Ferranti was released in 1969. It makes use of the company's transistors that admit...