The 555 chip constitutes a multi-vibrator with a frequency of 1 kHz, and the pulse width is mainly controlled by resistors R1, R2, R3, D1 and C2.
- When the adjustable resistor R2 is adjusted to the maximum value of R3, the resistance of the charging circuit is R3, which is 1.0kohm, and the pulse width is 5%.
- When the adjustable resistor R2 is adjusted to the middle position, the charging circuit resistance is 22kohm, and the pulse width is 50%.
- When the adjustable resistor R2 is adjusted to the minimum to R3, the resistance of the charging circuit is R1, which is 1.0kohm, and the width of the pulse at this time is 95%.
The output driver can be powered by a power transistor (such as 2N3055) or a MOSFET (such as IRF540), depending on the specifications of the DC motor used.
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