[time-nuts] +12 Volts 1A (plus a bit) supply?
KD0GLS
kd0gls at mninter.net
Thu Jun 27 15:09:43 EDT 2013
I've had good luck with the Power Trends (now Texas Instruments) PT51xx series, but unfortunately they are at end-of-life. The PT5102 is a 12-volt 1-amp three-terminal switching regulator.
http://www.ti.com/product/pt5102
The PT5101 was the 5-volt version. I think there is (or used to be) a 3-amp series as well, but I don't recall the part number. Maybe with a little digging on the TI website you can find a suitable replacement that will meet your needs. Last time I browsed through the Digi-Key catalog (back when they still printed one) there were many such power modules available.
.73,
Brent, KD0GLS, Minneapolis
On 27 Jun 2013, at 13:51, Bob Stewart wrote:
> The transformer gives me about 20 volts DC out. Dropping 8 volts at 1 amp is just a lot of power to void with a resistor. I'd like to avoid having that much waste heat in the unit. I do have an old power brick, but I was hoping there was some small switching board that people had had good luck with. Maybe the brick is the best option.
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> Bob
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>> ________________________________
>> From: Chris Albertson <albertson.chris at gmail.com>
>> To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com>
>> Sent: Thursday, June 27, 2013 1:32 PM
>> Subject: Re: [time-nuts] +12 Volts 1A (plus a bit) supply?
>>
>>
>>
>>
>>
>> You mean you have to many volts for a 12V regulator to drop> That's easy to fix, use a resister in series. Make the resister par of an RC filter and cleaner power in the process.
>>
>>
>> I use a plug-in power brink from an old notebook computer. I think mine outputs 15V and then this gets dropped to 12V and 5V with a RC filter and regulators.
>>
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