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Using switching power supply....

 

I wish to use switching power supply.

because I don't have power supply yet. but I can find to buy cheap switching power supply.

I had know that the switching power supply make a lot of noise.

So I will add RFC and Capacitor to reduce noise. if I will.

Is it possible?


I didn't received my BITX yet.

But I want to finish it before getting reach my BITX.
 

People had used smps for HAM psu.
?here is a possible link.
?
by xq2fod

?the Chinese make MW and others can be tried but with a toroid based filter at the output suiting the load

sarma
?vu3zmv


On Fri, Mar 17, 2017 at 12:45 PM, Yeonghwan Jun <ds5siz@...> wrote:

I wish to use switching power supply.

because I don't have power supply yet. but I can find to buy cheap switching power supply.

I had know that the switching power supply make a lot of noise.

So I will add RFC and Capacitor to reduce noise. if I will.

Is it possible?


I didn't received my BITX yet.

But I want to finish it before getting reach my BITX.







--
Regards
Sarma
?
 

There is a switching supply called the "Megawatt" (https://www.amazon.com/MegaWatt-S-350-12-9-5-15-Adjustable-Supply/dp/B00JZBE97U) that is filtered for radio use. I have one and it does work really well. Just make sure you get the "real thing (and spend the extra cash), and NOT a Chinese clone (those aren't filtered as well).

Rich
KC8MWG


On Friday, March 17, 2017 4:25 AM, Mvs Sarma <mvssarma@...> wrote:


People had used smps for HAM psu.
?here is a possible link.
?
by xq2fod

?the Chinese make MW and others can be tried but with a toroid based filter at the output suiting the load

sarma
?vu3zmv


On Fri, Mar 17, 2017 at 12:45 PM, Yeonghwan Jun <ds5siz@...> wrote:
I wish to use switching power supply.
because I don't have power supply yet. but I can find to buy cheap switching power supply.
I had know that the switching power supply make a lot of noise.
So I will add RFC and Capacitor to reduce noise. if I will.
Is it possible?

I didn't received my BITX yet.
But I want to finish it before getting reach my BITX.






--
Regards
Sarma
?
 

开云体育

I'm using a Samlex switching supply that I use for everything in my shack. Works great. I wouldn't get a cheap supply for radio work.

RPX



On 3/17/2017 12:15 AM, Yeonghwan Jun wrote:

I wish to use switching power supply.

because I don't have power supply yet. but I can find to buy cheap switching power supply.

I had know that the switching power supply make a lot of noise.

So I will add RFC and Capacitor to reduce noise. if I will.

Is it possible?


I didn't received my BITX yet.

But I want to finish it before getting reach my BITX.
 

开云体育

I am using a switching supply and I have no noise. It is small and I put it into the
case next to the PCB. Works great.
Ed

On 3/17/2017 2:15 AM, Yeonghwan Jun wrote:

I wish to use switching power supply.

because I don't have power supply yet. but I can find to buy cheap switching power supply.

I had know that the switching power supply make a lot of noise.

So I will add RFC and Capacitor to reduce noise. if I will.

Is it possible?


I didn't received my BITX yet.

But I want to finish it before getting reach my BITX.
Michael Davis
 

That's where I put my 5ah, agm deep cycle battery. I added a charging port to the rear and a switched voltmeter to the front. Fun stuff

Sent from Mike's iPad WA1MAD
 

I have a few orphaned laptop power supplies in the junk box- would one of these be 'clean' enough to use for this radio?


--
N3DSY - Rob
 

Rob? N3DSY

Add a large capacitor (470 to 4700 mfd) across the DC output and any of them
should be acceptable.? Might also add a 0.005 across that larger capacitor to
insure that higher frequency spikes are shunted off to ground.

Arv? K7HKL
_._


On Sun, Mar 19, 2017 at 1:49 PM, <robpnelson@...> wrote:

I have a few orphaned laptop power supplies in the junk box- would one of these be 'clean' enough to use for this radio?


--
N3DSY - Rob
 

开云体育

Between the power supply and the capacitors that Arv K7HKL recommends you might also construct a common-mode choke from a junk box powdered iron toroid you might have (T-37 or T-50 material best) and some #18 insulated copper wire.? Add a couple 47 nF (0.047 MF) capacitors on either side of of the choke.? See this YouTube video.


--Larry
K7LJG
 

I am using a sony SMPS from an old laptop with my BitX40 s. there appears to be no extra noise above the band noise that I can tell using this supply. Note this supply is 19.5v and I use a small step down converter to run the board at 12v and I have 19.5 V on the final. With this I get about 12 watts output. You could use a 3 terminal voltage regulator like a LM7812 to drop the volts to 12v for the board and then wire the final up to the laptop supply direct. The current draw on the board minus the final should be handled by the LM7812 but it would need some current bypass if you wanted to connect the final as well at 12V. thus my suggestion to run the board at 12v and the final at whatever the laptop supply outputs. I have run my final with 28v without problems and got in excess of 20 watts output.

your laptop supplies should be fine just check their voltage and adjust things to suit.
--
Mike VK3XL
Trent Trent
 

I done that wit mine,well the reg part n on 12v i get 10w out


On 21 Mar 2017 4:17 PM, "vk3xl via Groups.Io" <vk3xl=[email protected]> wrote:

I am using a sony SMPS from an old laptop with my BitX40 s. there appears to be no extra noise above the band noise that I can tell using this supply. Note this supply is 19.5v and I use a small step down converter to run the board at 12v and I have 19.5 V on the final. With this I get about 12 watts output. You could use a 3 terminal voltage regulator like a LM7812 to drop the volts to 12v for the board and then wire the final up to the laptop supply direct. The current draw on the board minus the final should be handled by the LM7812 but it would need some current bypass if you wanted to connect the final as well at 12V. thus my suggestion to run the board at 12v and the final at whatever the laptop supply outputs. I have run my final with 28v without problems and got in excess of 20 watts output.

your laptop supplies should be fine just check their voltage and adjust things to suit.
--
Mike VK3XL

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