Low Cost/Current 3-28vDC supply from 120/240v.
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Posted by logjam on October 18, 2006, 4:28 pm
Please log in for more thread options I want to switch 120/240vAC in a project with a panel mounted toggle switch. I do not want any electric shock hazard from touching the switch terminals. I've looked at the solid state relays like the D2W202F triac based relay. http://www.crydom.com/userResources/productFamilies/7/crydom_d2w.pdf They list a typical current of 3ma to turn on the relay with 5vDC. I don't know how much the current will change with 28v being used to switch the relay. What I was thinking about was a bridge connected directly to 120/240vAC and then a 5.1v zener diode/resistor regulator. Probably at the output of this small circuit board would be an additional resistor to limit the current at 5v to 10ma? So from quick math it seems like this solution would waste around 2.5-3W at 240vAC all the time? Are there any other solutions any of you could think of that would be better than this? For safety, I was imaging an input fuse of .1A and using maybe 3-4 zeners. They are cheap enough. If something were to go wrong the fuse should blow first. Thanks, Grant | ||||||||||||||||
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Posted by Homer J Simpson on October 18, 2006, 4:47 pm
Please log in for more thread options Shrink wrap them. | ||||||||||||||||
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Posted by logjam on October 18, 2006, 5:19 pm
Please log in for more thread options
Homer J Simpson wrote: >
> > I want to switch 120/240vAC in a project with a panel mounted toggle
> > switch. I do not want any electric shock hazard from touching the > > switch terminals. >
> Shrink wrap them. I've thought some more about it and I think I will do nothing. I will just run let the kit builder make their own choices. Including a PCB and parts dealing with AC and any shocks will be my fault. The kit currently has the panel mount switch soldered to a PCB (comming through the panel). The instructions are to put electrical tape over the 2 1" traces and switch terminals. Grant | ||||||||||||||||
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> switch. I do not want any electric shock hazard from touching the
> switch terminals.