Power supply for analog and digital microcircuits. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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The power supply for analog and digital microcircuits consists of three stabilized rectifiers, two of which form a bipolar voltage source of 12,6 V with separate regulation.
Adjustment is made by trimming resistors R6 and R9. The lower (according to the scheme) stabilizer provides a voltage of 5 V, which can also be adjusted by resistor R10.
The unified power transformer TAN 59-127 / 220-50 can be replaced with a home-made one with a magnetic circuit Ш 12 X 20. The network winding I for 220 V should have 3000 turns of wire PEV-2 - 0,12, winding II - 180 turns PEV-2 - ODZ , winding III - 220 turns of PEV-2 - 0,38 and winding IV - 70 turns of wire PEV-2 0,41. The different number of turns in the windings II and III with the same voltage at the output of the stabilizer arms in this power supply design is explained by the fact that a current of 60 mA is consumed from the upper (according to the circuit) arm, and 350 mA from the lower arm. If, according to the operating conditions, these currents should be equal, an equal number of turns of wire of the same diameter should be wound.
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