Only for reference this is a circuito f a commercial receiver of the year 1958. The circuit uses coils and transformers hadr to find in our days. The circuit is destinated to receive MW stations.
Found in a Motorola documentation from the 70s, this circuit makes use of transistors of the time....
In the figure we show how to use common diodes to get a reference near 3 V in a car gearbox. The...
The transistors of this 12 V x 150 mA power source can be BC558 for PNP and BD135 for NPN. The...