|
|||||||
| Home | Forums | Rules | Articles | Store | Gallery | Blogs | Register | Donations | FAQ | Calendar | Search | Today's Posts | Mark Forums Read | Search |
| Chip Amps Amplifiers based on integrated circuits |
  |
|
|
|
Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving |
 |
|
|
Thread Tools | Search this Thread |
25th December 2005, 03:12 AM
|
#1 |
|
diyAudio Member
Join Date: Aug 2005
|
Transformer Help
I have a LM 4780 amp chip kit which is virtually complete, but I am struggling to find a transformer (torroidial preferred) that has the correct specs. Yes, I am very new at this, but I have made strides and will complete this project provided I connect it to a fitting transformer.
The kit calls for a 300 VA transformer running at 22v. I found one close on the parts express site which runs at 350 VA...but at 55 volts. http://www.partsexpress.com/pe/showd...number=129-095 QUESTION: Will this suffice the project? I know that the over rating for the VA is ok but is the 55 voltage rating ok or will I just fry all my hard work? ANY ADVICE, SUGGESTIONS, OR WEB LINKS WOULD BE VERY HELPFUL. Thanks, Dominick---I will post pics of the final project!
__________________
A real amateur enthusiast! |
|
|
25th December 2005, 03:33 AM
|
#2 |
|
diyAudio Member
Join Date: Sep 2005
Location: Melbourne Florida
|
transformer help
Is this a single LM4780 or parralled?? 300VA is fine for either one.
parts express# 122-640 will work fine, its 330VA 25+25 and will give you a rectified voltage of about 35V+- |
|
|
|
25th December 2005, 03:39 AM
|
#3 |
|
diyAudio Member
Join Date: Aug 2005
|
Thanks for the info so quickly...This is for 2 mono amp kits(each is wired in parallel) so I guess I will need to buy two of the amps you suggested? right?
Thanks, Dominick
__________________
A real amateur enthusiast! |
|
|
|
25th December 2005, 03:46 AM
|
#4 |
|
diyAudio Member
Join Date: Sep 2005
Location: Melbourne Florida
|
transformer help
No one trans should do it. You will find vary different points of view on power supply overkill in the chip amp forum, but each parelled lm4780 will produce 120 watts both chanels will consume 240watts 330VA still gives you 100 watts of power" supply head room" without the transformer sagging.
|
|
|
|
25th December 2005, 05:52 PM
|
#5 |
|
diyAudio Member
Join Date: Aug 2005
|
tiltedhalo,
Thank you so much for lending your knowledge. I ordered the transformer today so I am hoping to have it by wednesday. Maybe I will have the entire project completed by friday. Thanks again, Dominick in New Jersey (well, Ohio for now)
__________________
A real amateur enthusiast! |
|
|
|
| Thread Tools | Search this Thread |
|
|
Similar Threads
|
||||
| Thread | Thread Starter | Forum | Replies | Last Post |
| Using mains transformer as output transformer | Elias | Tubes / Valves | 176 | 11th March 2013 09:35 PM |
| Modulation transformer for a driver transformer? | ironradio | Tubes / Valves | 6 | 28th December 2008 05:05 PM |
| filament transformer vs plate transformer | contaxchen | Tubes / Valves | 10 | 14th January 2005 10:43 AM |
| toroid Transformer as power Transformer for tube | tone | Tubes / Valves | 7 | 11th February 2003 08:57 AM |
| toroid Transformer as output Transformer for tube preamp? | tone | Tubes / Valves | 15 | 2nd February 2003 04:36 AM |
| New To Site? | Need Help? |
