Want To Build My First Hi-Fi Amp - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

Solid State Talk all about solid state amplification.

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 15th March 2005, 11:26 PM   #1
kdf9511 is offline kdf9511  United States
diyAudio Member
 
kdf9511's Avatar
 
Join Date: Mar 2005
Location: Houston TX
Default Want To Build My First Hi-Fi Amp

Hello all, I have been reading some of the posts here and have decided to build an amp for a TL Sonotube subwoofer I am planing to add to my system. I am currently using a PAS400 amp for my main speakers and want to add some bass for HT. I am an electronic engineer and have built RF linier power amps in the past so I have some experince with projects like this.

Can anyone recomend a good design for a first project? I don't want to try to design my own at this point. I have been looking at the Leach Superamp and TIM-Amp designs and they don't look to dificult and give a decent power output. I am looking for about 250W-350W to drive this sub. I am also thinking about building another one with 2 channels after I do this sub amp to replace the PAS400. It is a decent amp for mobile DJ work but I want a better sounding amp for my home setup. I have even been toying with building one with 5 Leach TIM-Amps for HT with a 5.1 processor feading it from the DVD player, but this might be to much.


I have the setup to etch my own pcb's witch is why I am looking at the Leach amps since he has kindly provided the pcb pattern on his site.

Any help on this would be greatly appreacated.

Thanks
Kerry
__________________
Where ever you go, there you are.
Don't forget your towel.
  Reply With Quote
Old 16th March 2005, 12:56 AM   #2
paulb is offline paulb  Canada
diyAudio Member
 
Join Date: Jun 2001
Location: Calgary
Some aussie sites:
http://www.aussieamplifiers.com/poweramp.htm
www.sound.au.com
  Reply With Quote
Old 16th March 2005, 01:56 AM   #3
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
A bridged pair of low TIM amps will meet your power requirements handily, although you might want to consider Jens Rasmussen's extended Leach for reliability if you want to use it for PA. Either way use plenty of heat sink.

I used mine bridged to drive my sub for a while. My sub gets 6 db of boost at 24 Hz. Using a 1KVA transformer and 39,000 uf per 58V rail I almost never ran out of power. Some very loud LFE heavy movies challenged it, but that's about it.

Starting with a stereo amp will also give you the option to really hear its performance on the mains while using your existing sub amp. IMHO as long as there is enough power and a beefy power supply, there isn't much of an audible difference in sub amps. A plate amp for your sub and the Leach for your mains would probably give you more for your money.
  Reply With Quote
Old 16th March 2005, 02:12 AM   #4
jleaman is offline jleaman  Belgium
Banned
 
Join Date: Apr 2002
Send a message via AIM to jleaman
id stay away from aussieamplifiers.com he is not supporting any thing at all. Id buy or build a leach or a aleph though : O )
  Reply With Quote
Old 16th March 2005, 02:40 PM   #5
kdf9511 is offline kdf9511  United States
diyAudio Member
 
kdf9511's Avatar
 
Join Date: Mar 2005
Location: Houston TX
Bob,

Thanks for your reply, I don't plan on using this for my pa system, I am trying to get away from the pa amp for my home system and want a good audiophile quality amp but don't want to just go out and buy one. I looked at some of the amps at Elliot Sound and liked some of them but I have read a lot of good things about the Leach amps.

My goal is to have an entire home built system so I can show it off and say I built it. I think I am going to build one of the preamps on the Elloitt Sound site but add 4 more inputs to it. One other project I have in the works is a DIY am and fm tuner. One of the guys I used to work with who is a RF engineer is helping to design these now, but the amps are the first part of this ongoing project.

You mentioned using the TIM's for the mains and a plate amp for the subs, do you know where I can get a good design for a plate amp?

Thanks
Kerry
__________________
Where ever you go, there you are.
Don't forget your towel.
  Reply With Quote
Old 16th March 2005, 03:05 PM   #6
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
Actually, I was thinking of a purchased plate amp. It's awfully hard to beat something like this http://www.partsexpress.com/pe/pshow...=300-796&DID=7 diy for the same money.

Any design can be made on a flatbacked heatsink mounted on a plate, if you want to go full diy. It saves the cost of an enclosure. You can substitute plastic package transistors in the Leach like Jens has done to make mounting easier.

Lots of people like the ESP amps. I have never heard them, so I won't comment. I like my Leach amps' sound. I like my A-75s a little more, just to throw out another option.
  Reply With Quote
Old 16th March 2005, 07:33 PM   #7
kdf9511 is offline kdf9511  United States
diyAudio Member
 
kdf9511's Avatar
 
Join Date: Mar 2005
Location: Houston TX
I have looked at that amp at Parts Express and considered it when I was originaly looking at build a standerd sub, but the design I am currently planning on is like the single driver here www.t-linespeakers.org/projects/steve/index.html . That is why I am thinknig about building a seperate amp for this and possibly expanding to 2 subs.

I have been reading the Pass DIY project site all morning and now I am torn between the Leach TIM and the A75 for the mains. Looks like I need to do some more looking ino this.
__________________
Where ever you go, there you are.
Don't forget your towel.
  Reply With Quote
Old 16th March 2005, 10:20 PM   #8
diyAudio Member
 
BobEllis's Avatar
 
Join Date: Sep 2003
Location: Upstate NY
The A75 puts out a lot of heat - I didn't like it here in PA, so you may object to the extra air conditioning load in Texas. It can be run at lower bias, mine is set to give me about 12 watts peak in class A, which takes care of the vast majority of my listening. It then goes to class AB for the rest.

Mine are non standard - to make use of transformers I had. Rail voltage is 65 for the front end and 58 for the output. I substituted irf610 and Irf9610 for the input differential pairs, just bending the leads to fit. Originally I had IRFD210/9210s but I toasted my last set. the sound difference was minimal - seemed brighter with the 610/9610s, but then I know they have lower gate capacitance. I only use 6 pairs of IRFP240/9240 for the output stage.

My A75s seem to extract a little more low level detail than the Leach, which was significantly better at that than my Yamaha DSP-A1. Bass seems tighter and better defined with the A75.

Part count is a little lower on the A75, and I found it a little easier to build mechanically. But by the time you buy bigger heat sinks and enough extra fets for matching, it is more expensive. It also takes more tweaking to get set up. I don't know for sure, but I think I spent about $800 on each A75 and $500 on my caseless 4 channel Leach.

hope this helps you decision process
  Reply With Quote
Old 17th March 2005, 02:05 PM   #9
diyAudio Member
 
still4given's Avatar
 
Join Date: Oct 2004
Location: Victorville, CA
Hi Kerry,

Not to muddy the waters at all, but I recently finished my first amp. I built the ESP P101. It was a very easy amp to build and it sounds very nice. I built it three channel, figuring to use it for the front end of a 5.1 system someday. I don't have a 5.1 preamp yet so I am using it in a stereo setup and using the third channel to drive my JBL B360 Subwoofer. I have gotten nothing but complements on how good it sounds.

I am about 75% finished with my Leach Superamp. It has been a much bigger challange to built with having to make my own PCBs. Silk-screening will spoil you quick.

I hope to have the Superamp finnished within the next week. I'm not sure if you are starting before then but I will report my opinions about how the two stack up against each other, at least to my ears.

Blessings, Terry
__________________
X-BoSoZ, B1 Mezmerize, P101, Symasym, KSA 50, Aleph-X, Leach Low TIM, Leach Superamp, Dx MKIII, Super A, Honey Badger, JLH 1969, Gainclone. FetZilla, Peeceebee, VSSA PMI & jkuetemann, SKA GB150, Ovation nx & sx, AX&SX-14, TMG8, Slewmanster w/CFA-XH, Wolverine, Spooky, Symasui, Low TIM hybrid
  Reply With Quote
Old 17th March 2005, 04:14 PM   #10
kdf9511 is offline kdf9511  United States
diyAudio Member
 
kdf9511's Avatar
 
Join Date: Mar 2005
Location: Houston TX
Just how hot does your A75 run? I think after reading all the info I could find on these I am going to build a Leach for the subwoofer and an A75 for the mains.

The cost for the heatsinks isn't much of a problem right now. I have a coworker who is working part time at a custom chopper shop with a milling machine and access to lots of billet aluminum and we have been toying with some ideas for custom heat sinks. I have even tossed around the idea of liquid cooling these to a radiator placed outside.

I guess now it is time to play with Electronics Workbench and model the schematics for these and see how the parts I have in the shop will work.
__________________
Where ever you go, there you are.
Don't forget your towel.
  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
I want to try and build my own DAC gareth Digital Line Level 3 3rd July 2009 03:20 PM
ZV9 build ingi Pass Labs 8 6th August 2006 02:40 PM
build my first full ranger,let's build another one:a small fullrange high end pc-spea then_dude Full Range 2 30th November 2005 07:54 AM
Do i need to build main supply (240v) filter?Or build power distribution? thomgun_lc Chip Amps 9 16th September 2005 09:52 AM


New To Site? Need Help?

All times are GMT. The time now is 11:21 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