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.
The circuit shown is only for analog telephone lines. I found it in Popular Electronics (1991). It...
In this circuit from the 60s, the power supply is made with 22.5 V, which is the voltage of the...
This circuit is from 1967 General Electric documentation. It uses SUS which are not very common...