OSH Park
Foam cutter circuit
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Foam cutter circuit
by
TorontoBuilder.
2
layer board of
2.09x2.40
inches
(53.01x61.01
mm).
Shared on
February 14th, 2015 21:54.
Circuit board for variable output foam cutter using either a “short” 24" or “long” 48" Nichrome Wire.
Uses a SPST switch and a 5K Pot to adjust the power output. The SPST switch bypasses the 5 Ohm resistance when using the longer 48" length of Nichrome wire.
When using the shorter 24" wire the switch directs the current through the 5 Ohm resistance to make up for the drop in resistance of the shorter Nichrome Wire.
Minimum BOM: Transformer, 25.2 VAC, 2 Amps TRIAC 400V 6A TO220 Heat Sink 5K linear Pot 10 ohm resistors, 10 watt, 2 required in parallel to make 5 ohm, 20 watt resistance 470 ohm, 1 watt resistor SPST Switches, 2 required (1 main power on, other is long/short nichrome wire switch) 1A fuse & fuse holder 2 Banana Plugs terminals or similar Nichrome Wire Enclosure
Optional: power on indicator lamp