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Description:
In this 2-7V power supply circuit, for our purpose, we chose IC 723 instead of a three pin voltage regulator for-why we find it protean and more advantageous in technical details.
Notes:
Heatsinks of Tr2 and Tr3 transistors must be sufficiently large.
To
archive R4,R5 and R6 values, we used some suitable resistors in
parallel. For R4 and R5 two parallel connected 0.3ohm/5W resistors for
each are used. To take 6A output, we connected two 0.22ohm/5W resistors
in parallel, and to take 8A output we connected three 0.33ohm/5W
resistors in parallel instead of R6 resistor.
If you change the marked component values
properly you can get up to 14V output. For this situation you must
disconnect R1,R2,C5,C6,C1,C2,D1,D2 components and connect the positive
terminal of D3 directly to the rectified and stabilized supply.
TIP142 is a darlington transistor so you can not change it with other normal transistors.
For
an example of the circuit operation; When a 0.68 ohm load was
connected, we desired to take 8A current at 5.5V but voltage drop was
about 0.18V. This means at 5.32V we got 7.8A and error was about %3.3.
At the same condition, ripple voltage was less than 25V(rms).
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