This circuit was obtained in a Popular Electronics from the 90's. The gain depends on R4 and R3. Transistors are general purpose types.
This small regulated power supply was found in a 1963 General Electric documentation. The special...
The battery charger suggested in the figure has its current limited by resistor R1. This component may...
January 2017 - Texas Instruments' new TPS7A19 Low Voltage Dropout (LDO) linear regulators are now...