Found in a 70s RCA transistor manual, this circuit is recommended for mass-positive cars of the era. The transistor is for general use.
This circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...
This circuit consists of an inverter powered by only 4.5 V. The circuit is from a 1967 Mullard...
We found this circuit in an English publication from 1969. It shows how we can implement a bridge...