Do I have what I need? LM4780

littlerick · 21st November 2009, 06:24 PM

My plan is to build a dual mono amp using the great looking kit from Audiosector. This is a first time project and I just wanna make sure I got everything in place.

So a single torodial transformer of 300VA 2x22v will connect to the two amps, each amp serving one channel. I know I will have to get a control for volume and in/out connectors, but will i need anything else to make it work.

I dont wanna get half way thru and find I gotta go find a small electrical part.

As I understand it this should give me 60watts per channel is that right?

Francec · 22nd November 2009, 08:43 AM

You do know about the rectifier and filter caps, don't you? AND proper earthing, on/off switch, case (earthed), AC lead and socket, input switching, earth loops, et al?

Frank

littlerick · 22nd November 2009, 10:32 AM

I havnt done one of these kits before and was just asking if there is any hardware I need to get before I start. or is the kit complete bar the transformer as far as a working amp goes.

TheSeekerr · 22nd November 2009, 01:34 PM

Basically complete, since Audiosector kits come with a rectifier board.

You'll also need some sort of signal input jacks, some speaker binding posts, a power inlet (either a cable and grommet, or an IEC socket) and the transformer.

Also useful is the knowledge of how to wire up the inputs with correct grounding so your amp doesn't hum, and how to wire up and mount the transformer so it doesn't kill you.

TheSeekerr · 22nd November 2009, 01:39 PM

Oh, also, LM4780 is a stereo chip - you either buy one board, and it supplies 2 x 60W (into 8 ohms) channels, or you buy two boards and set them up for bridged operation, in which case each board will give you 1 x 120W (into 8 ohms) channel.

littlerick · 22nd November 2009, 01:53 PM

Thank you, I am reading a lot of posts about the construction. I am expecting some teething trouble but I see most answers are here somewhere.

Also good to hear I will have twice as much as I was expecting watts wise. Dont want it loud, but a nice sound would be nice.

21st November 2009, 06:24 PM	#1
littlerick diyAudio Member Join Date: Nov 2009 Location: Lincolnshire UK	Do I have what I need? LM4780 My plan is to build a dual mono amp using the great looking kit from Audiosector. This is a first time project and I just wanna make sure I got everything in place. So a single torodial transformer of 300VA 2x22v will connect to the two amps, each amp serving one channel. I know I will have to get a control for volume and in/out connectors, but will i need anything else to make it work. I dont wanna get half way thru and find I gotta go find a small electrical part. As I understand it this should give me 60watts per channel is that right?

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
LM4780 SS Pcb	pinkmouse	Chip Amps	67	31st January 2011 12:35 PM
sonic differences between inverting/non-inverting LM4780 VS both non-inverting LM4780	jarthel	Chip Amps	5	19th July 2007 01:37 PM
MY LM4780 Amp	ziling	Chip Amps	7	6th July 2007 06:46 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?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	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

22nd November 2009, 08:43 AM	#2
Francec Banned Join Date: Jul 2006 Location: Port Melbourne, Australia	You do know about the rectifier and filter caps, don't you? AND proper earthing, on/off switch, case (earthed), AC lead and socket, input switching, earth loops, et al? Frank

22nd November 2009, 10:32 AM	#3
littlerick diyAudio Member Join Date: Nov 2009 Location: Lincolnshire UK	I havnt done one of these kits before and was just asking if there is any hardware I need to get before I start. or is the kit complete bar the transformer as far as a working amp goes.

22nd November 2009, 01:34 PM	#4
TheSeekerr diyAudio Member Join Date: Jan 2008	Basically complete, since Audiosector kits come with a rectifier board. You'll also need some sort of signal input jacks, some speaker binding posts, a power inlet (either a cable and grommet, or an IEC socket) and the transformer. Also useful is the knowledge of how to wire up the inputs with correct grounding so your amp doesn't hum, and how to wire up and mount the transformer so it doesn't kill you.

22nd November 2009, 01:39 PM	#5
TheSeekerr diyAudio Member Join Date: Jan 2008	Oh, also, LM4780 is a stereo chip - you either buy one board, and it supplies 2 x 60W (into 8 ohms) channels, or you buy two boards and set them up for bridged operation, in which case each board will give you 1 x 120W (into 8 ohms) channel.

22nd November 2009, 01:53 PM	#6
littlerick diyAudio Member Join Date: Nov 2009 Location: Lincolnshire UK	Thank you, I am reading a lot of posts about the construction. I am expecting some teething trouble but I see most answers are here somewhere. Also good to hear I will have twice as much as I was expecting watts wise. Dont want it loud, but a nice sound would be nice.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)