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DUAL_POLARITY_LOW_CURRENT_POWER_SUPPLY

2014-11-03 12:52  
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DUAL_POLARITY_LOW_CURRENT_POWER_SUPPLY
The 555 is operating in a free-running oscillator at about 120 kHz, producing a near-9-V square-wave output at pin 3. Diodes D1 and D2, along with capacitors C4 and C5, make up the rectifier circuit for the positive supply, while D3, D4, C2, and C3 make up the rectifier for the negative supply.