Originally Posted by
Tremorfalcon
I plan on building this PWM
http://www.rmcybernetics.com/project...controller.htm
PWMs can adjust the frequency and can adjust the pulse width and they are also used for limiting the amount of amps to the device.
What part of this PWM actually limits the amps? The schematic uses a 10Amp transistor, however I want the PWM to limit the current to 30amps. How would I go about limiting the current to 30amps? Would I have to get a 30amp transistor? Or could I get a 50amp transistor and somehow adjust it to limit the amps to 30?
These are the most common type you see on the web. The LM555 timing chip sets up a frequency that is adjustable by VR1. This frequency is fed into the LM393 comparator chip which is used to turn on and off the IRF740 MOSFET. The MOSFET is what pulses the current fed to the generator. The more the MOSFET is turned on, the more current applied to the generator.
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Some days I get the sinking feeling that Orwell was an optimist!