F@t> On Wed, 04 May 2005 23:36:52 +0200, Robert Heller wrote: F@t> F@t> >Does anyone happen to know how much current these things draw? I need F@t> >to know if the existing output transistors on a Chubb DOUT32 board can F@t> >handle it (2N4401's, which handle about 300ma) or if I need to build a F@t> >driver circuit. Nowhere on Kadee's site does it specify how much F@t> >current these units draw. F@t> >
F@t> >
F@t> > \/ F@t> F@t> I wouldn't count on it. Probbably better to use a power supply that can provide 50 F@t> Watts. I would use a 2N3055 as the switch from a suitable power source and use the F@t> Chubb circuit to turn on the 2N 3055. For that matter you can do it manually with a F@t> SPST momentary switch if you don't need to computer operate it. A 12V 50W or 60VA F@t> transformer can be had cheaply at most places that sell electronics hobbyist junk. F@t> You can route the Xformer output to a pre-packaged full wave bridge rectifier, hang a F@t> 3500 microfarad electrolytic capacitor across the output legs of the bridge and F@t> you're good to go with no question of reliability. The whole thing should fit in the F@t> palm of your hand.
I sort of figured that the uncoupler needed more power than the Chubb could handle, but was not sure. I've already designed a driver circuit.
F@t> F@t> F@t> Froggy, F@t> snipped-for-privacy@thepond.com F@t>
\/ Robert Heller ||InterNet: snipped-for-privacy@cs.umass.edu
formatting link
|| snipped-for-privacy@deepsoft.com
formatting link
/\FidoNet: 1:321/153