In this 2-7V power supply circuit, for our purpose, we chose IC 723 instead of a three pin voltage regulator forwhy we find it protean and more advantageous in technical details.
Heatsinks of Tr2 and Tr3 transistors must be sufficiently large.
To achive R4,R5 and R6 values, we used some suitable resistors in parallel. For R4 and [...]
A friend of mine who runs an electronic shop wants to install an old cd-rom to be used as a stand alone cd-player in his truck. His problem was to find a suitable power supply for this purpose. A cd-rom uses 2 power supplies, 5 Volts which is used in its logic circuit and 12 [...]
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The power supply circuit is shown in Figures 1 and 2. A 7812 positive 3-terminal regulator is used for the main 13.8V 10A regulator, and this is followed by as many power emitter followers as needed for the current you require. The transistors are not critical. I used 2N3771 [...]
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