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This circuit delivers either 4.8 or 7.2 V regulated at 15 mA with a 3-V input from a bank of photocells. Rl should be 453 kQ for a 7.2-V output and 274 Ø for a 4.8-Vdc output. Regulator efficiency is around 70%. This should be considered when selecting suitable solar cells.
Source:www.circuitos.cl.tripod.com
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