Solar Power Supply

  
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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  for a 4. 8-Vdc output. Regulator efficiency is around 70%. This should be considered when selecting suitable solar cells.
Solar Power Supply - schematic




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