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The 555 linear PWM circuit

2017-03-16 20:05  
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The 555 linear PWM circuit
See as figure 5-25, IC(555), R2, VT1 and C1 compose the controllable single steady circuit, the contemporary pulse wavelength is in backward proportion to the input modulation signal, the higher the modulation LEV is, the narrower the pulse will be. VT1 is a symmetric dual triode BT51, which composes the mirror image current source with R2 and R3, and the mirror image makes the charge current of C1 keep linear in the contemporary stable period, the linearity is ±0.2%.