160VA xfrmrs for Chipamp?

[albireo13]

I am building a stereo LM3886 chipamp. I have the kits and need to order the xfrmr now. Since I will use it for modest levels, I am thinking 25-30w/ch.

I am thinking a 2x22V xfrmr will do. I am leaning towards 160VA instead of 200VA. I want the amp to be as compact, small as possible, since I will put it on my desk next to my PC. I originall was going to order from Antek but, I see they don't offer 160VA toroids.

Is their an alternate, quality source I should look at in the states?

Thx,
Rob

[AndrewT]

a two channel amplifier with a target maximum output power of 20W to 30W will operate from a 40VA to 120VA transformer.
The only disadvantage of these small transformers is the high regulation.
At very low output signals the voltage from the PSU is much higher than nominal voltages would predict. Be careful choosing capacitors that can stand the worst case voltages that may occur.

In essence, any transformer from 40VA to 200VA will allow the chipamps to work.

[mullardel34]

Originally Posted by albireo13

I am building a stereo LM3886 chipamp. I have the kits and need to order the xfrmr now. Since I will use it for modest levels, I am thinking 25-30w/ch.

I am thinking a 2x22V xfrmr will do. I am leaning towards 160VA instead of 200VA. I want the amp to be as compact, small as possible, since I will put it on my desk next to my PC. I originall was going to order from Antek but, I see they don't offer 160VA toroids.

Is their an alternate, quality source I should look at in the states?

Thx,
Rob

An excellent source is Avel Lindberg, which offers a range of 160VA toroidal power transformers. The 2x22VAC@3.64A output model Y236503 is about 4"(D)x1.7"(H). Parts Express has the unit in stock (Avel Y236503 160VA 22V+22V Toroidal Transformer | TRS transformers transformer toroidal transformer toroidal toroid mounting kits kit gauge copper avel | Parts-Express.com
Transformers and Power Converters From Avel Lindberg, Inc.)

[albireo13]

That Avel Lindberg xfrmr looks like exactly what I want. Problem is cost is a bit high ... $48 compared to a 22x2 200VA Antek unit at $29.
Will think it over.

Thx,
Rob

[albireo13]

I ended up ordering the Avel xfrmr. It's a lower profile xfrmr, which I like.

Rob

[mullardel34]

I've had great success with Avel-Lindberg, Plitron and Antek toroidal power-transformers; these manufacturers' product provide excellent long-term performance. Good luck with your project!

[jleaman]

Originally Posted by albireo13

That Avel Lindberg xfrmr looks like exactly what I want. Problem is cost is a bit high ... $48 compared to a 22x2 200VA Antek unit at $29.
Will think it over.

Thx,
Rob

I use antek's in my aleph amplifiers and they are all good