Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Options
View
Go to last post Go to first unread
highflyin9  
#1 Posted : Thursday, July 21, 2016 2:13:23 AM(UTC)
highflyin9

Rank: Member

Groups: Member
Joined: 7/21/2016(UTC)
Posts: 2
United States
Location: Maryland

Which of these two xformers would be a better bet? I know both would work, but

Antek AN-10425 - 1000VA 25V TRANSFORMER (4x25V)

Antek AN-8420 - 800VA 20V TRANSFORMER (4x20V)

It's only a $16 difference. Chips would be using the same heatsink and won't be super far apart, but size is ample, 310mm tall by 150mm wide. Will be using a soft start circuit FWIW.



Also, unrelated question, but would using polyproplyene caps in C3/C4 be better than polyester? Have a few Wimas laying around.

TIA.
Brian Donegan  
#2 Posted : Thursday, July 21, 2016 5:25:24 PM(UTC)
Brian Donegan

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,805
Location: Massachusetts, USA

Thanks: 2 times
Was thanked: 127 time(s) in 122 post(s)
I use this one: http://www.antekinc.com/...4-600va-24v-transformer/

600VA is plenty, and 24V is the sweet spot.


Also, MKP caps will work fine in place of the MKT. I primarily use the MKTs as they are slightly smaller and allow better access to the chip mounting screws. You can always mount them under the board though.

Edited by user Thursday, July 21, 2016 5:26:36 PM(UTC)  | Reason: Not specified

highflyin9  
#3 Posted : Saturday, July 23, 2016 5:16:46 AM(UTC)
highflyin9

Rank: Member

Groups: Member
Joined: 7/21/2016(UTC)
Posts: 2
United States
Location: Maryland

Thanks Brian,

You don't think the extra headroom of the 1000VA would be worthwhile? Assuming I could toss a resistor inline for a voltage drop from each 25V output (R = V / I, R = 1 volt / 10 amp) = 0.1R resistor rated at 10W+ to get it down to 24V?

Thanks for the info re: the PP caps.
Brian Donegan  
#4 Posted : Monday, July 25, 2016 8:06:54 PM(UTC)
Brian Donegan

Rank: Administration

Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,805
Location: Massachusetts, USA

Thanks: 2 times
Was thanked: 127 time(s) in 122 post(s)
1000VA 25V would definitely work, no need to drop the voltage (assuming an 8-ohm load). If you are using lower impedance speakers (4-ohm), you probably want to look at a lower voltage (20-22V).

Rss Feed  Atom Feed
Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.