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Subject: Re: Need help designing AC circuit to produce 150 watts across resitive heaters

Date: 05/31/01 at 12:52 AM
Posted by: karl Jungkind
E-mail: jungkik@ilos.net
Message Posted:

In Reply to: Re: Need help designing AC circuit to produce 150 watts across resitive heaters posted by Joe Chilleme on 04/04/01 at 8:08 PM:

Your problem is made complex by the low value of resistance and hi operating voltage. Even with all resistors in series, your maximum resistance is still only 6 ohms, resulting in a minimum RMS current of 20 amps and a resultant wattage of 2400W when connected. If you must use 120V the electronics required to limit the wattage current would be fairly complex. The potential for dangerous overheating would be high, in the event of electronic component failure. Safest method if you insist on using the 1.5ohm resistors (in series) is a step down transformer 120v:30V @5A minimum. This would give you 150W


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