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Details about  Audio power supply regulator kit 12v DC, 5 amp T-amp

Audio power supply regulator kit 12v DC, 5 amp T-amp See original listing
Audio-power-supply-regulator-kit-12v-DC-5-amp-T-amp
Item Ended
Item condition:
--not specified
Ended:
10 Aug, 2012 08:27:48 BST
Price:
US $20.00
[
History:
]
 
Approximately £11.69(including postage)
Postage:
US $12.00 (approx. £7.02) Economy Int'l Shipping | See details
See details about international postage here.  help icon for delivery - opens a layer
Item location:
hongkong, nil, Hong Kong

Description

eBay item number:
360200333379
Seller assumes all responsibility for this listing.

Item specifics

Condition:

New

 
Please check the S&H fees before you "buy it now". Thanks.
 

 
 

 
 
 
DC 12V, 5 amp
AC to DC power supply
regulator assembled kits

DESCRIPTION:
You are bidding the
DC 12V, 5 amp
AV to DC power supply
regulator assembled kits
 
> 100% Brand new.
> Made in Hong Kong
> Input : AC 15-18V
> Output : DC 12V, 5 amp
> Dimension : 74mm x 104mm x 70mm
 
Featuring MJ2955, L7812cv,
big heat sink
deliver stable DC 12V, 5 amp power
Perfect for T-amp, DAC, Pre-amp.
The best design for stable 12Vdc, 5 amp output.
 
* transformer is not included.
 
Don't miss this chance to upgrade your gear......

SHIPPING and HANDLING :
>By registered air-mail (with tracking number)
   S&H fees USD$12 to ANYWHERE.
>US winner will receive the item with 7--14 days
  after the payment is received.
>We won't take responsible for item damage without insurance.
> Please note that there is no return policy in this auction.

PAYMENT :
I accept Paypal .
>The winner need to effect the payment by PAYPAL
  within 3 working days after the auction ends.
  thanks.

CONDITION :
>Serious bidders only.
>I don't accept the negative feedback buyer's bid 
  and your bid will be cancelled.
>Also zero feedback bidder must e-mail me
  before place your bid.
>After auction ended, the winner
  please contact me within 72hrs,
  otherwise I will leave a -ve feedback
  and add you to the black list.
>Although, I am a new seller,
  please place your bid with confidence.
  I must try my best to satisfy your need.
  Feel free to e-mail me with any question.
>Thank you. Happy bidding. Good luck.
 



 
 

 Audiophile Killer :
EMI <Electromagnetic Interference, e.g AC transformer, power cable>
RFI <Radio Frequency Interference, e.g Radio broadcast, cellular phone>
 
 
 
 




On Nov-23-08 at 10:23:43 PST, seller added the following information:

 Technical Notes :


Notes:
Although the 78xx series of voltage regulators are available with different current outputs, you can boost the available current output with this circuit.
A power transistor is used to supply extra current to the load the regulator, maintaining a constant voltage.
Currents up to 650mA will flow through the regulator, above this value and the power transistor will start to conduct,
supplying the extra current to the load. This should be on an adequate heat sink as it is likely to get rather hot.
Suppose you use a 12v regulator, 7812. The input voltage should be a few volts higher to allow for voltage drops.
Assume 20 volts. Lets also assume that the load will draw 5amps. The power dissipation in the transistor will be Vce * Ic or (20-12)*8=40watt.
It may keep you warm in the Winter, but you will need a large heatsink with good thermal dissipation.
If you want to increase the output current with a negative regulator, such as the 79xx series, then the circuit is similar,
but an NPN type power transistor is used instead.

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