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1800/- Rupees for 12 V 20 Amps? Is this possible? HOW?

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1800/- Rupees for 12 V 20 Amps? Is this possible? HOW?

Postby VU3BEP » Tue Mar 16, 2010 2:06 pm

Just guess what will be the least possible cost to constuct a 12 volt power supply with 20 amps output. its really 1800/- and some hams in Mangalore have bought it from a Mumbai based trader. Thus just wanted to know some ways or possibilities about how can construct or Homebrew 12V@20 amps at 1800/- Rupees. Is it really possible or the price i heard is a hoax?
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Postby mvs sarma » Wed Mar 17, 2010 1:05 am

when one gets material by auction , selling partial things at cheaper price is possible
the actual prices in India are being jacked up like anything.
Thus a 13.8V 20 amp power supply need not cost more than that, sir
Regards
Sarma
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Postby VU3BEP » Wed Mar 17, 2010 3:18 pm

Yes..its possible to sell for cheap if its auctioned and bought as second hand. But here it is new and the said person is manufactring and selling it. So i had another thought that it may be possible in case, a PC ATX power supply is modified at the "Power good" section and the main transformer is re-wound or replaced with a custom made one to deliver the said voltage and current. After all you'll get a PC ATX supply at 400/- in open market.
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Postby radiopatel » Wed Mar 17, 2010 5:25 pm

The power supply is SMPS and it is available for 1800/-The price is about to go up soon due to component prices. The supply is made only after some orders are accumulated. It is very good for field operations.

DE VU2DCI
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Postby mvs sarma » Wed Mar 17, 2010 6:23 pm

VU3BEP wrote:Yes..its possible to sell for cheap if its auctioned and bought as second hand. But here it is new and the said person is manufactring and selling it. So i had another thought that it may be possible in case, a PC ATX power supply is modified at the "Power good" section and the main transformer is re-wound or replaced with a custom made one to deliver the said voltage and current. After all you'll get a PC ATX supply at 400/- in open market.

As most people know, HAMs never use switching power supplies for their RIGs perhaps to prevent interference. Mostly they prefer Linear power supplies.
Regards
Sarma
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Postby VU3BEP » Wed Mar 17, 2010 8:52 pm

radiopatel wrote:The power supply is SMPS and it is available for 1800/-The price is about to go up soon due to component prices. The supply is made only after some orders are accumulated. It is very good for field operations. DE VU2DCI

It would be of great help if you can please post the address and phone number of the person delaing with that? I would surely buy two for my curiosity.
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Postby bobbyks2000 » Thu Mar 18, 2010 6:39 pm

Switching Power supplies mostly employ high frequency to increase efficiency and in the process, some of this RF energy, leaks into the output despite being converted to DC.

While this may be good enough for applications such as cell phone chargers, laptop adaptors, etc The same may not be a good choice for VHF/UHF rigs.

The reason being RF interference and instability problems particularly in the oscillator stage.

Additional filtering may be required to achieve a perfect DC output which considerably increases the cost of the product.

I Opinion that Linear Power supplies are best for High Power TX / transcievers.
------------------------------
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Bobby
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Postby vu3wjm » Sun Mar 28, 2010 10:34 pm

Hi!

My personal experience , most of the Indian SMPS have very high level of noise for HF applications. However I found a Taiwan made supply by brand name Meanwell to be satisfactory.

12v 29 amp supply costs abt Rs2800/ the quality and construction is good. It is better to chip in the extra money. 20 amp unit may be still cheaper.



73's
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Postby radiopatel » Mon May 17, 2010 11:59 am

I agree with Rahul VU2WJM

Mean well is best solution. Some of their 12V supplies can be adjusted in +or- 10% of output.

The SMPS priced at Rs 1800/- is now priced at Rs 2200/-

Dinesh
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Postby kshitijm » Tue Jul 20, 2010 9:41 am

Can some one tell the address / phone number of persons selling linear power supplies in Mumbai ?? Interssted in buying 13.8 Volt 20 Amp PS.

what budget should I keep for this Power supply??

73

Kshitij
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Postby bobbyks2000 » Sat Aug 14, 2010 11:19 pm

I have just found a shop in koti hyderabad selling the 12V 20A SMPS made by two brands. One is Meanwell and other is RuWell.

I have been told that they are priced at Rs 2200 and Rs 1600 respectively.

Shop is called Agrawal ElectroSales.
------------------------------
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Bobby
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Re: 1800/- Rupees for 12 V 20 Amps? Is this possible? HOW?

Postby VU2WSX » Sat Sep 27, 2014 1:33 pm

SMPS is possible
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S.ELANGOVAN VU2WSX
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Re: 1800/- Rupees for 12 V 20 Amps? Is this possible? HOW?

Postby radiopatel » Sat Sep 27, 2014 3:55 pm

Meanwell is advisable based on my knowledge and experience.

Dinesh Patel
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