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Electronics people - Transformers?

N

NuclearFusi0n

Diamond Member
"...30-0-30 transformer will give a peak power of about 100W into 8 ohms, or 90W or so continuous. This is influenced by a great many things, such as the regulation of the transformer, amount of capacitance, etc. For a pair of amps, a 300VA transformer will be enough. "

Where can I find a 300+ VA 30-0-30 transformer? circuit

I know i'm probably gonna shock myself but i don't care 😀

help me out thx.

edit: "The bridge rectifier should be a 35A type"

What's a bridge rectifier, and where can I buy a "35A" type?
 
Digikey is your friend.

A bridge rectifier is just 4 diodes in series usually shown in a diamond pattern in schematics. Look it up on google or something. You could make your own out of diodes of course making sure they all handle enough voltage and current, or just buy the part from Digikey. As for the transformer I assume 30/0/30 stands for the windings but it would be nice if they told you that. Transformers are also available at digikey.

Or you could go to radio shock where their helpful informative sales staff will stare blankly at you and say, huh? Wassat? You've got questions? We've got blank stares.
 
Here's one, $11, but it is only 120VA. You could parallel two to get 240VA.

link

Here's a 1200va, but @ $650, a bit pricey: TP-81-14414-1: 60vct @ 20amp; 120v Primary $650.00

link


Here's a 400VA 30+0+30 for $85 - 30 V + 30 V secondaries, rated for continuous operation at 400 VA (6.67 amps).



link
 
thank you yellowfiero

Does anybody have a link where i could learn what "secondaries" are? just basics of all this stuff

if you haven't figured it out yet, i'm researching building (2) 90 watt power amps

question: if i took the first link yellowfiero posted, and paralled three of them, how would it compare quality wise to the last one? it's important the power is as ripple and noise free, and as CLEAN as possible.
 
Originally posted by: NuclearFusi0n
thank you yellowfiero

Does anybody have a link where i could learn what "secondaries" are? just basics of all this stuff

if you haven't figured it out yet, i'm researching building (2) 90 watt power amps

question: if i took the first link yellowfiero posted, and paralled three of them, how would it compare quality wise to the last one?
Click to expand...

2ndaries = the "ouput" windings

any intro electronicsbooks hould have stuffon xformers

not sure about online though. i searched a bit and there's a lot of yslesslinfo
 
Originally posted by: NuclearFusi0n
thank you yellowfiero

Does anybody have a link where i could learn what "secondaries" are? just basics of all this stuff

if you haven't figured it out yet, i'm researching building (2) 90 watt power amps

question: if i took the first link yellowfiero posted, and paralled three of them, how would it compare quality wise to the last one? it's important the power is as ripple and noise free, and as CLEAN as possible.
Click to expand...

link

link2

link3

link4

hth
 
read rod's articles on power supplies on that same site.

retail you can get them from www.plitron.com or www.toroid.com

price will be ~ $60-120 or so. plitron is normally cheaper but their page isn't working right when i go to "products" so you might need to call.

 
Well, as long as we're on the topic of transformers, anyone know about the types used in VCR power supplies? I've got an old VCR with a dead PS and the crackling noises seem to be coming from the transformer. Not sure how to figure out exactly what type the transformer is though.

ZV
 
Originally posted by: Zenmervolt
Well, as long as we're on the topic of transformers, anyone know about the types used in VCR power supplies? I've got an old VCR with a dead PS and the crackling noises seem to be coming from the transformer. Not sure how to figure out exactly what type the transformer is though.

ZV
Click to expand...

Zemmer, most VCR's use a switch mode transformer in the PS, I seriously doubt the x-former itself is your problem.

Anyway most are custom x-former's and you'll have a very difficult time finding one.

Probably be best to just trash the VCR 😉
 
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