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Subject: Re: Switching between power sources
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Date: 02/03/03 at 3:42 PM
Posted by: Brian Snell
In Reply to: Switching between power sources posted by Bill on 01/20/03 at 3:01 AM:
Greetings. I can send you a copy of a simple "switchless" circuit for backup powering. It uses only one transistor (TIP112) and one resistor, and is O.K. for currents up to 1 or 2 amps. It is intended to provide seamless switching between two DC sources, but there is a voltage drop across the TIP112. This would not be too much of a problem at 12v but would be significant at 5v.
Let me know if this could be helpful.
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