power?

Author	Message
donmck Guru Joined: 09/06/2011 Location: Australia Posts: 1314	Posted: 10:11pm 12 Nov 2011         pcaffalldavis said   I tried running my SM1 Dontronics on a clean, accurate 6 volt bench power supply and it will not boot. I have to have at least 8 volts before it will start up. I'm confused to read that I should be running it on 6 volts. Could that be the original Maximite instead of the DonTronics SM1 version? I looked all over the DonTronics web site and the schamatic for the voltage information, and there does not seem to be a voltage listed. Isn't the SM1 designed to run on 9 to 12 volts? Pete in Hyder Not sure what direction you are heading Pete, but I think the standard 7805 input must be about 7.5V to about 20+ Volts. read: http://en.wikipedia.org/wiki/78xx for example. The SM1 uses a 7805 on the input. If you want 5V operation, then use the USB port for power. I am confused to read you should be running it on 6VDC, as Geoff's power schematic is almost identical to Richard's. The only difference being the SM1 uses some low voltage diodes, instead of a power selection link. Hope this helps, Cheers Don... https://www.dontronics.com