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555 Negative voltage source circuit

2015-02-04 06:00  
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555 Negative voltage source circuit
As shown in Figure 9-1, 555 and R1, R2, C3 form an astable multivibrator, f = 1.44 / (R1 +2 R2) C3, the frequency of the icon parameter is about 80kHz. R2 is greater than the R1, so the duty cycle closes to 50%. The output oscillation pulses is rectified by the D1, D2, C2, and it gets a negative voltage and offers tens of mA load current.