resistor heater to heat a 10 cu/ft box to 100 degrees - Page 3 - Electronic Circuits Projects Diagrams Free

MOSFET KILLER · 2nd November 2009, 10:42 PM

You can use nichrome wire, it is inside hair dryers. Just buy a cheap hair dryer, unwind the heating element (nichrome wire). For power control you can use PWM from an LM555 to drive a large transistor. Find out how many amps the transistor needs to be rated for by looking at the wattage on the hair dryer. Also, the heating element will work just fine with rectified DC which is what you are going to need for the transistor. The thermostat will be the duty cycle control on the LM555.

cbiblis · 3rd November 2009, 03:07 AM

i got the wire off of ebay it was the biggest gauge they offered in 100'.

mneary · 5th November 2009, 09:45 AM

You could buy a hair dryer and just use the element.and fan (just take off the pretty plastic case. or not.). Get a 220V unit, it will operate at 1/4 rated power on 120. You can get cheap "travel" units for as little as $6.

I would be a little concerned about motor reliability, but at 1/2-1/4 speed it might be satisfactory.

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2nd November 2009, 10:42 PM	#31
MOSFET KILLER	You can use nichrome wire, it is inside hair dryers. Just buy a cheap hair dryer, unwind the heating element (nichrome wire). For power control you can use PWM from an LM555 to drive a large transistor. Find out how many amps the transistor needs to be rated for by looking at the wattage on the hair dryer. Also, the heating element will work just fine with rectified DC which is what you are going to need for the transistor. The thermostat will be the duty cycle control on the LM555.

3rd November 2009, 03:07 AM	#32
cbiblis	i got the wire off of ebay it was the biggest gauge they offered in 100'.

5th November 2009, 09:45 AM	#33
mneary	You could buy a hair dryer and just use the element.and fan (just take off the pretty plastic case. or not.). Get a 220V unit, it will operate at 1/4 rated power on 120. You can get cheap "travel" units for as little as $6. I would be a little concerned about motor reliability, but at 1/2-1/4 speed it might be satisfactory. __________________ de KI6RWX