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Jim, I have switch 1A radio shack relays with BX24 ... typically you need one transitor and one diode for each relay ... I will try to dig up the circuit ... Search for the R/S part number on google and I bet you will find a schematic with the details that I mention (transitor and diode) ... -- Doug

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Being a software developer and not an EE I have a few design questions. Please be gentle with me. LOL I would like to make a heat controller for some heated clothing I have for my motorcycle. I'll be powering the BasicX from a regulated 1A 5V power supply I'm building. I'm planning on having at least 3 different zones. I will be using 5V relays from Radio Shack that are rated at 5A @ 125VAC to switch the 12V heated items. The items should not draw more than 2A and any time. I'll be controlling the relays with a ULN2003. The heated clothing will be powered directly from the battery and not the above power supply. I plan on using a duty cycle of 2 seconds and depending on the requested percentage of heat, I will switch the relays on and off. For example if I'm requesting a setting of 25% I will power on the relay for .5 seconds and off for 1.5 seconds. I may choose to use a longer duty cycle, but not more than 5-10 seconds. As a general design, does this seem like a good way to go? Will I burn out the contacts on the relays from turning them on and off so often? This is a "one off" design for my own personal bike, but I still want to keep the costs down. Jim Fouch FOUCH SOFTWARE <http://www.fouchsoftware.com> (814) 455-1294 [Non-text portions of this message have been removed]

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