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I would build the power supply in the unit, so only one cable goes to the wall outlet and everything else is inside the unit. You can purchase ready made switching power supplies that weigh next to nothing and provide any voltage @ current you need. This is a lighter weight alternative to...
pwm for zilog
You could use a 555 timer, an oldie, but a goldie. See Figure 8 in the following:
**broken link removed**
If you need more sophistication Microchip's dsPIC30F2020 is a 16-bit micro designed for PWM applications.
In between are all kinds of things. Everybody from Analog Devices...
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