I'm looking to use an LM338 to control a heater for an incubator, and I need a circuit that will allow me to vary the resistor value, adjusting the output voltage as a result. What I'm really after is a circuit that I can push a button and have it 'step' to the next resistor value. I've scoured the internet, and even attempted a few circuits myself, no luck. Anyone have any ideas?
The heating element draws 8 amps at 12 volts (pulled it from an old heated seat pad).
I've considered PWM but can't find a way to control it via pushbutton (pshbutton is required so i can control it from two locations, and also so i can have a couple of preset temps)
The heating element draws 8 amps at 12 volts (pulled it from an old heated seat pad).
I've considered PWM but can't find a way to control it via pushbutton (pshbutton is required so i can control it from two locations, and also so i can have a couple of preset temps)