[Scottyyy]

Hi everyone,

I have a question about powering this amp. I'm currently using two 9v PP3 rechargable batteries so it will be powered indefinitely, but I was wondering if it would be worth getting a DC power supply to power it. How much would a 28v (I think that's the most you can use) DC power supply improve it over the batteries?

If it's worth it, could someone do me a huge favour and find a suitable one here: www.maplin.co.uk

I really don't know what I'm looking for you see. Knowing my luck I'd probably pick the wrong one and blow the poor amp up.

Thanks

 

[Scottyyy]

Also, what should I use: high gain or low gain? I'm only going to be using AD700's and Denon D2000's. Is high gain prefered for full sized headphones?

 

[koto-in]

Quote:

How much would a 28v (I think that's the most you can use) DC power supply improve it over the batteries? If it's worth it, could someone do me a huge favour and find a suitable one here: www.maplin.co.uk

A power supply will enable the amp to deliver significantly more power to the headphones than the battery. Although both your headphones are low impedance and thus easy to drive, they both have tremendous power handling capacity which means that the sound quality that they can provide should benefit by the additional available power. How much is something you will have to decide with your own ears, but the potential is there and therefore experimenting with a power supply would be recommended.

Maplin has a 15V wall wart that will work: maplin. To find a 24V or 28V supply, you'll have to do some more searching. Whatever you get, just make sure it's regulated.

 

[koto-in]

Quote:

Originally Posted by Scottyyy /img/forum/go_quote.gif Also, what should I use: high gain or low gain? I'm only going to be using AD700's and Denon D2000's. Is high gain prefered for full sized headphones?

Gain is adjusted relative to headphone sensitivity and the strength of the input signal. Start with low gain and if you end up around 12 o'clock at your normal listening level, you're good. If you're way over, switch to high gain.

 

[Scottyyy]

Thank you very much koto-in. Much appreciated.

I'll have a search for a 24v regulated power supply then and see how much they are.

Thanks again.

I found one that looks pretty good:

http://www.djmusickit.co.uk/proddetail.php?prod=P007KB

Has everything I'd need.

 

[Henry Flower]

Switching power supplies such as that one are apparently not ideal as power sources for amps - too noisy. What you really want is linear one, but 20something volt linear PSs are thin on the ground.

 

[Scottyyy]

Quote:

Originally Posted by Henry Flower /img/forum/go_quote.gif Switching power supplies such as that one are apparently not ideal as power sources for amps - too noisy. What you really want is linear one, but 20something volt linear PSs are thin on the ground.

Hmm, yeah I can't find any of that type at all.

 

[koto-in]

Here's one if you can find it: mascot 8312

 

[koto-in]

Found, but it will cost you. elfa

Stock number: 69-127-86
Product name: Batterielim.24V 0.8W stab
Manufacturer: Mascot
Type designation: 43.8312/24
Country of origin: Norway
Data sheet:
Unit: Piece
Original package: 10
Sales package: 1
Replacement: 69-880-42 (direct equivalent product)
VAT (or equivalent) rate: 25%
Minimum order quantity: 1
Dimensions (package): 105X90X60 mm
Weight (package): 239 g
Informative text:
Catalogue page / Catalogue number:
Customs number: 8504408190
UNSPSC: 30211504
RoHS information: Does not conform to the RoHS-directive

 

[Mansize_tissue]

Here's a linear, regulated 24v DC power supply. At least, i think it's linear. It does mention a linear DC output on that page, so i guess it is. Does this fit the bill?

 

[koto-in]

Quote:

Originally Posted by Mansize_tissue /img/forum/go_quote.gif Here's a linear, regulated 24v DC power supply. At least, i think it's linear. It does mention a linear DC output on that page, so i guess it is. Does this fit the bill?

Your session timed out so the link was broken, but thanks for the location.

The power supply I found there is the Mascot 2083, Product No. 400-7140. It's a desktop unit rather than a wall wart but it would work well. The output plug is interchangeable and the right one Mascot 3635 should be ordered with the power supply. I didn't find the plug at RS but maybe if you call them, you can get it.

 

[wader]

For my in-transit (used, from Scottyyy !) MkIII, I just ordered one of these Elpac wall warts. The "Catalog Page" PDF linked off that order page confirms it is linear, regulated, 24VDC, .33A, etc.

Actually, you can go to the Elpac site and search on "WM080-1950-760" to obtain a list of links for current retailers which have the unit in stock.

FYI.

- wader

 

[sugarinthegourd]

Wader, I have one of these Elpacs on the way as well, for my Porta Corda mkIII. In fact, it may be here today. It didn't look like the plug was the right size. Have you soldered the Meier-supplied plug onto the Elpac cable yet? If so, any tips?

tia,

John

 

[wader]

Hi John,
I just got my Porta Corda MkIII today and expect the Elpac to arrive soon - I'm in the same position as you, so will also report what I figure out as a viable way to go. My used model does not have a Meier-supplied plug, so I may need to locate one in the workshop or scour Radio Shack-like places.

- wader

 

[brospin]

I use a 24V/300 mA regulated power supply for my Porta Corda MkII. It's made in Taiwan and doesn't have any brand on it. I bought it in Spain for not much more than 10 Euro if I'm remembering well. It works perfectly and the amp sounds good. I had to solder the power plug that came with the amp since it is much smaller than the plugs that come stock with most wallwarts.