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foam cutter power supply

Hi Guys,
I need help to get a circuit to work. I found a triac controlled circuit on the web but I can not get it to work.
I used a dimmer switch to control the current on a 220/24VAC transformer that worked well but does not last. I replaced 3 dimmer switches before I decided there must be a more reliable way and safer way to cut foam. The circuit was used by a person that claims he has been cutting foam with it for the last 15 years. here is the link: http://www.nsrca.org/technical/tip_tricks/foam_cutter/foam_cutting_power_supply.htm.

So I think it must work but perhaps he did not include the correct circuit. I cannot get his contact details to ask him.

 

please could someone put it in multisim and simulate it for me. please note that I am using a 24vac @ 10amp 50Hz  and not 2 amp as in the circuit. I actually need between 4.5 and 5.5 amp to cut EPP foam

Thanks

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