proteus999
New Member
I am wondering if I can use a 9v dc power supply (or battery) on a piece of equiptment that requires a 9v Ac wall wart? Won't the internal rectifier pass the 9v DC input voltage thru?
Thanks
Dave
Thanks
Dave
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Another reason to make a wallwart with an AC output is to maximize the VA you can get out of a certain size wart. Without the bridge, cap, and wiring there is more room for a beefy transformer.incidental to add a bridge rectifier to the device, a secondary power supply manufacturer is going to add a markup to the rectified output as opposed to an AC one, just because they can.
Part of the problem stems from the fact that, in the capacitive input filter supply, the conduction angle of the rectifiers is really small resulting in a peak rectifier current 3-5 times the average value. This will increase the rectifier forward voltage drop much more than you would initially expect.With the 500ohm load even the signal diode model should approximately mimic a better rectifier diode under higher load. I just used the 4148 because it was the first diode on the model list, the load is only 20ma's RMS.