This symmetric 30 mA x 15 V power supply was found in the Ferranti transistor manual from 1974. Transistors are common types at the time.
The critical component of this circuit is the transformer. T1 and T2 can be BD135 and T3 / T4 can...
In the figure we show the typical configuration of a shared line using a twisted pair where the...
This circuit originally came out in a Budget Electronics from 1981. The American magazine no...