[bjarnetv]

i just got a mini 3 kit from glass jar audio, but it turns out that finding a suitable wallwart is easier said than done here in norway, so being a foolish DIY noob i was wondering how important it is to follow the specs on the amb website.

i have found several linear 12v Dc adapters but no 15-24v ones (except for one... that costs $50).

will a 12v wallwart be enough, and does it matter if it outputs more then 500ma?

thermal paste is also surprisingly expensive/difficult to find; is it essential or optional?


i will probably have som more stupid questions later, but these should be enough for now

 

[MisterX]

Try # 1217081 from Farnell Norge | Ledende distributør av elektronikkomponenter og produkter til service og vedlikehold.

But it has a 2.1mm plug....

Edit:

And the thermal paste is optional.

 

[sachu]

You could try making a treads into a wallwart.
As for thermal paste..you can buy arctic silver thermal paste used for CPUs..works great.

 

[bjarnetv]

thanks, but farnell wont sell their stuff to ordinary humans, only to other enterprises.

edit:
Quote:

Originally Posted by sachu /img/forum/go_quote.gif You could try making a treads into a wallwart. As for thermal paste..you can buy arctic silver thermal paste used for CPUs..works great.

but the only store i could find that sells non conductive thermal paste doesnt have it in stock, and buying it on the internet means added shipping costs

what do you mean by making a treads into a wallwart?

 

[sachu]

Quote:

Originally Posted by bjarnetv /img/forum/go_quote.gif thanks, but farnell wont sell their stuff to ordinary humans, only to other enterprises. edit: but the only store i could find that sells non conductive thermal paste doesnt have it in stock, and buying it on the internet means added shipping costs what do you mean by making a treads into a wallwart?

Here you go...

 

[gurusan]

Can't you just find an unregulated 12V or 15v linear adapter on ebay or something?

 

[bjarnetv]

Quote:

Originally Posted by gurusan /img/forum/go_quote.gif Can't you just find an unregulated 12V or 15v linear adapter on ebay or something?

i guess thats the only solution if 12v regulated wont work.
the only problem as that it will probably take close to two weeks for the wallwart to arrive if i buy it on ebay, and i want a working amp right now dammit!

does it matter if the wallwart is rated at something like 1A instead of 500mA?

 

[gurusan]

Well I am still waiting on my kit to be delivered...but I was going to buy this for it. Adapter 15VDC 0.8A max 12w UK 3 pin 240V input. on eBay, also Standard AC Power Supplies, Power Supplies, Laptop Accessories, Computing (end time 24-May-09 15:26:57 BST)

Maybe you can find something similar...

 

[gurusan]

I'm about to purchase the psu in my above post for my mini3. Can someone just confirm that it will work ok?

 

[bjarnetv]

according to the amb website there might be some issues with the third prong: "The AC-DC adapter should be fully isolated. That is, if it has a three-prong AC wall plug, the AC earth pin should not be internally connected to either the positive or negative outputs"

maybe this is something you could mod yourself if it turns out be be an issue?

i ended up taking my chances with one of these.
hope it works

 

[gurusan]

yeah I'm having trouble finding out if they are isolated or not

 

[MisterX]

I would be more worried about the switchmode power supply from post #10 being isolated then the linear one you picked...

 

[bjarnetv]

Quote:

Originally Posted by MisterX /img/forum/go_quote.gif I would be more worried about the switchmode power supply from post #10 being isolated then the linear one you picked...

but wont it be isolated if doesnt have a ground pin? or did i perhaps misunderstand what isolated means

i also figured that there wouldnt be any problems with it being a switching power supply, since i wasnt planning on using the amp with the power supply connected. (as far as i understood, the only issue with using switching instead of linear PS was high frequency noise when connected)

 

[gurusan]

So....I'm still at a loss as to which PSU to buy :/

**edit** I actually found the recommended 15V psu from farnell listed on the amb site

so I got that.

 

[bjarnetv]

i got the 15V "hong kong" wallwart i bought from ebay today.
it works great, with no noise when connected.

recommended if you cant find a suitable wallwart locally