A simple digital dimmer using a cheap 8-bits AVR ATtiny13, made for educational purposes.
It have been designed to be controlled by a potentiometer (externally connected via 2.54mm headers) or a analog or PWM 0-5V signal.
The speed input signal source can be either from a potenciometer or a external 0-5V signal.
The source is selected by the SWITCH_SPEED (externally connected via 2.54mm headers).
The 0-5V signal is filted by a low-pass filter defined by R1 and C1.
This circuit:
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handles AC voltage and may be dangerous;
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have not been tested yet;
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does not include fuse.