Lm4780 - Page 3 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

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
Reply
 
Thread Tools Search this Thread
Old 29th November 2006, 06:52 PM   #21
Hara is offline Hara  United States
diyAudio Member
 
Hara's Avatar
 
Join Date: Oct 2005
I bet these questions are so common we should create a gainclone wiki. Anyone think this would be a good idea?
  Reply With Quote
Old 29th November 2006, 07:49 PM   #22
diyAudio Member
 
wotsascott's Avatar
 
Join Date: Apr 2006
Location: Oxford
Send a message via MSN to wotsascott Send a message via Yahoo to wotsascott
" I also have one little question about the powersupply.

Can I use one withe these specs:

300VA, 2x24 Volt, 2x6.25A "

This is perfect in my experience, with the standard 1.4 multiplier you should give you around 36volts ish. Don't use any voltage regulators as they have a maximum tolerance of 35 volts! I popped a few with my own PSU??
I've found that you can get 60 watts plus into a 8 ohm load with this setup. Personally, I would use two, one for each PSU/Chanel.
Although my recent gainclone only used 1 PSU and I got 50 watts plus into my 4 ohm Jamo giants!
__________________
Life? It's a Gippa!!!
Scott
  Reply With Quote
Old 3rd December 2006, 08:27 PM   #23
Hara is offline Hara  United States
diyAudio Member
 
Hara's Avatar
 
Join Date: Oct 2005
Because I'll be potentially bridging a 6.6 ohm driver (apparent 3.3 ohm when bridged) I decided to go with dual 250VA 18-18.
  Reply With Quote
Old 6th December 2006, 05:17 PM   #24
flraer is offline flraer  Sweden
diyAudio Member
 
Join Date: Oct 2006
Quote:
Originally posted by wotsascott
This is perfect in my experience, with the standard 1.4 multiplier you should give you around 36volts ish. Don't use any voltage regulators as they have a maximum tolerance of 35 volts! I popped a few with my own PSU??
I've found that you can get 60 watts plus into a 8 ohm load with this setup. Personally, I would use two, one for each PSU/Chanel.
Although my recent gainclone only used 1 PSU and I got 50 watts plus into my 4 ohm Jamo giants! [/B]

I'm not really sure if I know what you mean. Should I remove some components from my rectifier bord?


/ The noob
  Reply With Quote
Old 6th December 2006, 08:56 PM   #25
diyAudio Member
 
wotsascott's Avatar
 
Join Date: Apr 2006
Location: Oxford
Send a message via MSN to wotsascott Send a message via Yahoo to wotsascott
Hi Guys,
[QUOTE]I'm not really sure if I know what you mean. Should I remove some components from my rectifier bord?[QUOTE]

What I meant is that if you are going to use any sort of voltage regulator chip then remember that most can only handle 35 volts before they are destroyed!
To be honest it is unlikely in a gainclone's PSU.
I gather the power supply you plan to use is something like this:
http://images.google.co.uk/imgres?im...lr%3D%26sa%3DN
If so then this is ideal and no components should be removed!
I built one power supply for each channel on mine and a seperate 300va 25-0, 25-0 toroid transformer for each PSU.
The PSU's supplied a steady 35 volts! <25x 1.4= 35 ish>
See what I mean?
__________________
Life? It's a Gippa!!!
Scott
  Reply With Quote
Old 6th December 2006, 10:45 PM   #26
flraer is offline flraer  Sweden
diyAudio Member
 
Join Date: Oct 2006
Now I understand!

Thank you very much for the help

It's ordered now. Can't wait for it to come.


/ Fredrik
  Reply With Quote
Old 7th December 2006, 08:49 PM   #27
diyAudio Member
 
wotsascott's Avatar
 
Join Date: Apr 2006
Location: Oxford
Send a message via MSN to wotsascott Send a message via Yahoo to wotsascott
Hi Again,
Quote:
It's ordered now. Can't wait for it to come.
Have you ordered a kit? My first gainclone was one of Rod Elliots from ESP; worked around the LM3876! I used vero board and components I could "harvest" from junk at home, sounded as sloppy as it's construction. Rod's circuit is great though and I see he's finally added a "gainclone" < we all succumb to social terminology in the end> to the ranks of his other 100+ circuits!!
After that I bought one of Brian's kits at chipamp.com. The single power supply version of the LM3886 kit; it sounds awesome.
You'll find that you can't stop at one, the buzz takes hold; it is very rewarding.
A tip is that the electronics are the easy part <for me anyway>, it's the pigging cosmetics of the chassis that frustrates!! I find myself not happy every time I build one. So try and find a stopping point and keep it simple! I have made some monumental cockups from tinkering with minor unecesary changes.
When you first turn it on <and it works> you'll be hooked for sure!!!!
I've moved on to the LM4780 chip <2 LM3886's in one package> and am playing with 2 of them in parallel! 4 glorius 3886's!
Try Rod's site out:
http://sound.westhost.com/index2.html
__________________
Life? It's a Gippa!!!
Scott
  Reply With Quote
Old 14th January 2007, 09:55 PM   #28
flraer is offline flraer  Sweden
diyAudio Member
 
Join Date: Oct 2006
Ooops, havenot been here for a while due to some personal reasons...


Yes I hav ordered a LM4780 kit from audiosector. I hope it wold work just fine when I put the pieces together.

You will probably see meny stupid questions from me from because I am a beginner att this


Edit: Since I have bought a kit from audiosector, should I ask questions about it in the thread at "Vendor's Bazaar" ?


/ Fredrik
  Reply With Quote
Old 14th January 2007, 09:59 PM   #29
Netlist is offline Netlist  Belgium
diyAudio Moderator Emeritus
 
Netlist's Avatar
 
Join Date: Jan 2003
Quote:
Originally posted by flraer
Edit: Since I have bought a kit from audiosector, should I ask questions about it in the thread at "Vendor's Bazaar" ?
A good starting point is to look at the thread starter's original post and see if you question or answer fits in the thread. Not that all threads are constantly on topic of course.

/Hugo
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
sonic differences between inverting/non-inverting LM4780 VS both non-inverting LM4780 jarthel Chip Amps 5 19th July 2007 01:37 PM
LM4780 from who? jarre Chip Amps 6 10th August 2006 08:04 AM
lm4780 p/s j9184p Power Supplies 4 28th June 2006 05:18 PM
anybody tried a LM4780? travis Chip Amps 162 23rd March 2005 09:14 PM
lm4780 odysseybmx414 Chip Amps 2 22nd February 2005 07:13 AM


New To Site? Need Help?

All times are GMT. The time now is 06:49 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2