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Voltage Regulator IC question




 
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Author Topic: Voltage Regulator IC question  (Read 9504 times)
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WA1GFZ
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« Reply #25 on: June 02, 2010, 03:47:47 PM »

Don,
Put some resistance in series with the transformer primary to drop it down a bit. I found these series regulators are not happy when you get to 40 volts input and about the only way you can kill them. you only need 3 volts above the output to make them regulate.  Changing the resistor to ground will not help because it is a voltage reference. You will have output -1.25V across that resistor. Try Mouser. 
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Mike/W8BAC
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« Reply #26 on: June 02, 2010, 07:53:10 PM »

I don't know about Digikey or most of the other suppliers but I can tell you Mouser is the best supplier I have ever found. If they have what your looking for you never have to pose as a business and they are happy to sell any item with no minimum. They will even send you a phone book sized catalog now and than with everything they supply. I have never had to wait for back orders and the return policy is simple. If it don't work they replace it. No inflated shipping charges either. I agree with Frank, Try Mouser.

http://www.mouser.com/

Mike
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