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555 special power supply for razor

2015-01-27 09:37  
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555 special power supply for razor
As shown in Figure 9-34, the power circuit is composed of AC step-down rectifier circuit and DC voltage conversion circuit. It is used for 1.5V ~ 4.5V razors sold in general market. 555 and R1, R2, RP1, D5, C2 etc. form an astable multivibrator, the oscillation frequency is decided by the charging and discharging time constant. If the potentiometer RP1 uses 33kΩ multi-turn potentiometer, the oscillation frequency is about 800HZ, adjusting RP1 can change the output waveform duty cycle, the duty cycle is large while the output voltage of the emitter of VT1 pipe is low. The using effect is the criterion.