Transformer.

[Slabbefusk]

Okay so i have two transformers, one for 230V to 9V and one for 230V to 12V.

The 9V one has two 9v outpot cables and one ground. The 12V one saids its double insulated and therefore doesnt need grounding, so it only has two 12V output cables.

I thought about building a Little Gem MkI/MkII or a Ruby, and using either of these for the power supply so i could built a small ampwith out the need for adapters or batterys.

My question to you is, can i use any of these for my project and what is double insulation?

If you ask i can take pictures of them both.

[G_urr_A]

I can only help with one thing...

Double insulation ("dubbelisolering") means that the transformer has no electrified parts inside it that can come in contact with conducting pieces on the outside. Thus, you don't need to ground it (part of the reason you have a ground is to make sure that if a part comes lose and electrifies the outside of a piece of equipment, the current will go to ground, thus effectively removing the hazard).

Förresten, pratar du sån där typisk Norrköpingsdialekt?

[Slabbefusk]

Thanks for the info.

Hur visste du att jag var svensk?

Och nej jag tycker inte att jag har någon typisk norrköping dialekt, bara drag av östgötska

EDIT: Ah ser att du är medlem på metaltabs.com , cheers.

Edited October 17, 2004 by Slabbefusk

[Slabbefusk]

Okay one more question, i dissected an old pair of PC Speakers and i got two pots out of it, they both have two sets of lugs and i wonder if i could use these in a Little Gem and just use one of the two sets on each pot.

[lovekraft]

Yes, you can use half of a dual-ganged pot in place of a single pot so long as the resistance, taper and power ratings are correct.

Back to those transformers - are they wall warts, or are they raw frame transformers? A transformer produces AC current, which will not work unless you build it into a rectified power supply, but most wall warts are power supplies, and produce regulated DC power. The main thing you need to check before using either to power your Little Gem is the current rating - make sure that you have more than enough to supply the necessary current to the amp without excessive voltage drop and heating, or you'll soon be replacing something.

[Slabbefusk]

The heating aint a problem since i have a huge fan which i took from an old computer, and both of them have either AC or DC (AC/DC!! WOOHOO!!!) outputs so it shouldnt be a problem.

EDIT: Whats the taper on a lug?

Edited October 18, 2004 by Slabbefusk

[lovekraft]

...The heating aint a problem since i have a huge fan which i took from an old computer...

If you run a power amp without sufficient current available from the power supply, it won't be pretty, regardless of any fans, heat sinks or cooling systems you might attach. Ignore this at your own risk.

EDIT: Whats the taper on a lug?

RG explains this so much better than I can:

The Secret Life of Pots (RG Keen, Geofex.com)

scroll down to Which leads us to tapering.

Edited October 18, 2004 by lovekraft

[Slabbefusk]

Hmm okay but i think the current should be sufficient i mean the transformers have both been in active speakers at 5 to 10 watts, and the Little Gem aint more than 2 watts so...