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Consumer Electronics by S. P. Bali

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POWER SUPPLY CIRCUITS FOR STEREO AMPLIFIERS

(1) Dual Supply: Fig. 21.16 is a schematic diagram for a simple split supply. The use of 1 Ω resistors on the filters keeps charging surges at a tolerable level to minimise the ripple content on the output.

 

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Fig. 21.16 Dual supply circuit for the stereo preamplifier (notice the polarities of the electrolytics and zener diodes)

 

Since each of the 220 Ω series resistors has to drop about 6 volts, it establishes a zener current of about 25 mA. The load current and zener current are additive through each source resistor, bringing each resistor's dissipation close to one-half watt. To be conservative, ...

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