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Hi Brian, I'm over the border in England - South-West Leicestershire. I would think that Maplins would be the obvious choice - although they're relatively expensive. No matter.
I found this page in a search for "variable power control in a MOSFET pwm" -...
Thank you for your input Brian. It confirmed what I voiced in my reply to Anand. The critical factor in the circuit is the wire. I would need to adjust the current across the wire to an optimum temp. high enough to cut cleanly and low enough to avoid vapourisation of the wire. This is why I...
Hi again, Anand, thanks for giving me of your time and expertise and the reference.
I looked up MOSFET. I think I understand how they work. A variable resistor would have current continually applied to it whereas a MOSFET switches off and on continously as it senses a given power level being...
Hi Anand - Thank you so much for your reply. I am unfamiliar with the terms MOSFET and PWM - although I've already encountered them in internet searches. I will investigate them more closely. If you can specify a particular variant and/or explain the theory further given the parameters I gave...
Hi,
I've built a hot-wire device for cutting polystyrene. I used a computer power module (ATX-350) drawing off from the 12v rail/line. I've use 28 gauge Nichrome wire. The arrangement works insofar as the wire heats up to orange glow. However I feel I need a fine control. I bought a Lutron...
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