PinoyDVD: The Pinoy Digital Video & Devices Community
Home Theater => Audio => Amplifier => Topic started by: joan2 on Sep 01, 2003 at 02:10 PM
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these 250watt ave. continous power into 8ohm monster is hailed as one of the best sounding amps available to diy'ers...i have the magazine copy of the article and some spare boards to any one interested in building these amps..this amp can definetly give tube amps a run for the money at literally lower cost.....any one interested can email me at [email protected] or [email protected] or can call me at 6438957....tony
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sir,
How about the transistors needed for this project? would you know where I can get them ?
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you can get them for free thru onsemi's samples program, but get only what you need lest they become suspiciuos......these are the transistors that are required:
1. MJ15003/15004 as outputs 16 for stereo
2. MJE15030/15031 as drivers
3. MJE340/3450 as VAS
4. MPSA06/56 as small signal transsitors
on semi used to be motorola semiconductors.....
here is a good link to follow:
http://www.diyaudio.com/forums/showthread.php?s=5137a992d7be07eded0168022a1faef7&threadid=6075&highlight=leach+amps (http://www.diyaudio.com/forums/showthread.php?s=5137a992d7be07eded0168022a1faef7&threadid=6075&highlight=leach+amps)
and another:
http://www.diyaudio.com/forums/showthread.php?s=5137a992d7be07eded0168022a1faef7&threadid=7526&highlight=leach+amps (http://www.diyaudio.com/forums/showthread.php?s=5137a992d7be07eded0168022a1faef7&threadid=7526&highlight=leach+amps)
i would like you to meet prof. leach:
http://users.ece.gatech.edu/~mleach/superamp/ (http://users.ece.gatech.edu/~mleach/superamp/)
http://users.ece.gatech.edu/~mleach/lowtim/ (http://users.ece.gatech.edu/~mleach/lowtim/)
http://users.ece.gatech.edu/~mleach/lowtim/faq.html (http://users.ece.gatech.edu/~mleach/lowtim/faq.html)
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i have some transistors in stock availble for those who want to build this project....
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anyone?
how about a hiraga 20 watt class A amp? this is easier to do....
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sir joan2
the tel. no. you posted is not working , kindly check. i am trying to contact you , i am interested to build one. ;D
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baka busy sa internet pero that is the number....
i must forewarn those interested to build this amp that this project is not for the newbies as a mistake here can cost you a lot of money, solid state amps unlike tubes, require more caution and a lot of know-how....i recomend that you study carefully the links i have posted, and i am here to assist you in any thing that you do not understand...
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sir joan, i'm currently building a douglas self amp. may suggestion b kayo on how to fabricate a quality pcb?
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since i was out of the country for a long while, i lost contact with those that deal with these pcb fabs. you can go to alexan for the photographic method, making pcbs is single quantities can be expensive, i use silksceen method....
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hello all!
I found an IC "TDA7265" with 25W total power. You can search it on the net. Schematics are included. This is a lot more easier to build. Recommended for those who have small room or space. If you want more power try to make it in bridge to deliver upto 50W power. Or try the TDA7295 with 80W of full power.
This IC are the one used by generic speaker manufacturer. Try openning those speaker you will see.
Regards,
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hello all!
I found an IC "TDA7265" with 25W total power. You can search it on the net. Schematics are included. This is a lot more easier to build. Recommended for those who have small room or space. If you want more power try to make it in bridge to deliver upto 50W power. Or try the TDA7295 with 80W of full power.
This IC are the one used by generic speaker manufacturer. Try openning those speaker you will see.
Regards,
Hello! I think these are gainclone alternative IC's. Are these available in manila?
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the TDA7294 (100w) is available locally.
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the TDA7294 (100w) is available locally.
This could be the right chip i'm looking for. Anyways, i'm currently looking at diy amps at sound.westhost.com (http://sound.westhost.com). The amplifier projects lack protection circuits but these circuits can easily be incorporated as modules.
I'm currently doing the foil pattern for the Project 3A 60-80 watt amplifier. The schematics for this amp is very simple and the components are few.
Pwede na ito for people who won't be needing a 100+ power, but want to try out transistor based amplifiers.
Pero meron din naman scaled down version ang Super Leach Power Amp, 100 watts with foil patterns available for free sa internet.
Sir Joan2, thanks for the info regarding DIY Audio. Nakita ko na yung infos na hinahanap ko.
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GC, that is a good info, can you please post here where we can buy this chip, in RAON? thanks
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i have with me 6pcs fr4 double sided boards for this power amp with most components already soldered in, in case any body's interested...thanks
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i have xerox copies of the audio magazine article by prof. leach, i can send you hardcopies thru tha mail, just call me at 6438957...thanks
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beauty, eh? to the sirs who have built both amps, how does your leach amp differ in sound from your gainclone? which is better?
i thought my amp had big caps w/c is beer can-sized... but this one is beer mug-sized!! :o
(http://203.131.66.146:8080/leach1.jpg)
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Aha, now we're talking about amps with attitude...
I have built and listened to Rod Elliot's P3A, Prof. Leach's Low TIM Amp (smaller version of the Super Leach), and those wonderful gainclones. They are all very good, which one you build is up to you....
BTW, someone (i forgot who) told me that ON Semi has stopped their samples program already, that's sad.
Good luck to all of you guys.
JojoD
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..this amp can definetly give tube amps a run for the money at literally lower cost.....
soundz good!! ;D how much is your estimate sir? thnks ::)
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soundz good!! ;D how much is your estimate sir? thnks ::)
jerix, i've talked to mang tony about building one for me but he's already retired from the business and is into audio just as a hobby. problema kasi yung chassis kelangan pa fabricate or if DIY man masyado matrabaho gawin. sabi niya if i can find a chassis, the internals can be assembled easily. the super leach amp in the pic cost less than 10k but that was many years & inflations ago.
hmm... sir JojoD, which amp nga ba - super leach, leach low TIM, gainclone or hiraga class A? if ever a magnepan MMG happens to fall into my lap (i wish!! ::)), 250wpc can come in handy. but i like the simplicity of the gainclone... less parts, less points of failure.
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Guys,
I really can't tell you which one to build. But in my case, budget was a major problem. Solution, build them one at a time, very slowly until I build them all and then I can compare them with each other. Not a very good solution but it works for me. I just can't stop tweaking/building amps. Though my wife doesn't approve everytime.
JojoD
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the super leach amp in the pic cost less than 10k but that was many years & inflations ago.
hmm,, mahal din pala bro AKYAT-- ::) thnx.
bro Jojo, kamusta na ginagawa mong amp? i dont know much about amps, pero may i ask, can this be compared with the WS preamp being talked about here bro? thnx
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hmm,, mahal din pala bro AKYAT-- ::) thnx.
yup, medyo... actually its alot less than 10k pero i dont want to post his price 10yrs ago kasi hindi na realistic yun sa ngayon. medyo inaawitan ko pa si sir tony kung pwede magpagawa. otherwise, a 2nd hand power amp with the same specs could cost around 15k sa buy&sell (yamaha m80), or up to 26k sa greenhills (yamaha mx-1).
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Jerix,
WS preamps are line level preamps. Not power amps. Preamps are for signal conditionind and/or attenuation.
The 150W amp was delivered a week ago. Leiko wants to audition a gainclone which I am currently finishing now on a piece of wood 8).
akyatmountain,
What if a stereo super leach amp can be realistically built for 11K? What would you do? ::)
JojoD
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What if a stereo super leach amp can be realistically built for 11K? What would you do? ::)
hmm... that's more than the gainclone but then again the specs are higher. can you do it just like sir tony did? he used gigantic caps & a transformer thats bigger than anything ive ever seen. and a brushed aluminum chassis to match? hehe... hirap gawin nung chasis.
now i have too many options: a gainclone, a super leach, a hafler, a tube amp... woohooo! ok talaga dito sa pinoydvd... ;D ;D ok sa hobby pero di ok sa bulsa... :-X :-X
(http://203.131.66.146:8080/leach2.jpg)
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hmm... that's more than the gainclone but then again the specs are higher. can you do it just like sir tony did? he used gigantic caps & a transformer thats bigger than anything ive ever seen. and a brushed aluminum chassis to match? hehe... hirap gawin nung chasis.
now i have too many options: a gainclone, a super leach, a hafler, a tube amp... woohooo! ok talaga dito sa pinoydvd... ;D ;D ok sa hobby pero di ok sa bulsa... :-X :-X
(http://203.131.66.146:8080/leach2.jpg)
pre para sa yo.. oks lahat.. malalim bulsa mo e.. hehehehe ;D ;)
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hmm... that's more than the gainclone but then again the specs are higher. can you do it just like sir tony did? he used gigantic caps & a transformer thats bigger than anything ive ever seen. and a brushed aluminum chassis to match? hehe... hirap gawin nung chasis.
now i have too many options: a gainclone, a super leach, a hafler, a tube amp... woohooo! ok talaga dito sa pinoydvd... ;D ;D ok sa hobby pero di ok sa bulsa... :-X :-X
(http://203.131.66.146:8080/leach2.jpg)
if it's just like what akyat said - you might get 2 orders ;D
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pre para sa yo.. oks lahat.. malalim bulsa mo e.. hehehehe ;D ;)
nyeheh... sayo ako uutang dahil mas malalim... ang karanasan mo sa audio. ;D
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if it's just like what akyat said - you might get 2 orders ;D
iceman, on the lookout ka rin ba ng match para sa preamp? hehe tiyak galing niyan pre, inip na nga ako eh pero lapit na.
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iceman, on the lookout ka rin ba ng match para sa preamp? hehe tiyak galing niyan pre, inip na nga ako eh pero lapit na.
tumitingin tingin din - di nga maka decide eh:
a) tube amp - MA B2 speakers ang kaya
b) power amp - for Audience 52 (di pa rin all tubes)
haayyy sana may pera para sa lahat, tsaka may lugar sa bahay.. :-[
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can you do it just like sir tony did?
sorry, i can't...
JojoD
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ok sir JojoD, i know the chassis is the hard part, as tony himself told me. for what he was charging at that time, i think it was a bargain. the problem though with custom built amps is that you won't know how it sounds until there's no turning back. which is why its always good to have a demo unit lying around somewhere.
tony's leach super amp (http://gallery31067.fotopic.net/show_collection.php?id=80381)
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akyatbundok,
From what I have read, Tony is an avid amp collector, hence, has much valuable "ear" experience since he had his hands on tubes, solid state, and now the gainclone all of which have different designs. Tony has probably chosen the leach amp due to it's design topology and he has followed it since it's first version. I made the "smaller" version 4.5 amp because since it's introduction (1970s i think), many are still in love with their leach amps (frankly, so am I).
To sum it up, the leach amp, wether the super leach or it's smaller brother, is an excellent power amplifier. The word "no turning back" is not applicable to it since these amps are very good indeed and if you decide to build it or have it buiilt, you will surely be rewarded for many listeninig nights. ;)
JojoD.
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yes! just the kind of reassurance i need.
will chronicle the sourcing, building & listening... abangan! (might take long though)
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Happy to have helped!
JojoD
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as if there wasn't enough choices already, here's another one... a ready to assemble super leach amp... i took these pics when i brought in my 2 luxmans to joan2's place for repair, and last i heard he has fixed one already... he said the 60w/ch luxman can match the sound of the leach amp, except the 200w/ch super leach has much more power reserve, so i assume the leach retains its sound quality at high volume whereas my luxman kind of breaks apart when driven hard... too bad his last leach got sold already, would have been game for a shootout. ;D
(http://203.131.66.146:8080/joan3.jpg)
(http://203.131.66.146:8080/joan4.jpg)
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Sir
After I finished all my projects could you help me with this Leach Super Amp.
Thanks
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Sir, saan nyo po nabili yung mica capacitor nyo? thanks...
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Sir, mica capacitor I need, 390pf, 180pf, 47pf, 10pf
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Tony,
tumutunog na ba? what's your idle current setting? tagal tagal naman nyan. ;D
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aha! mine is at 100ma now, before it was set to 200ma but the constant heat is bothering me. a better heatsink is really in order. but at 100ma it's still fine since I use the amp while working or doing pc work so it's most of the time at low levels.
i've heard other diyers at diyaudio use 250ma and they say it's really great! i wonder, with such huge heatsinks and a really really really stiff psu, why not try going up to 500mA? :o now that's hot! ;D
unfortunately, i also don't have the time to build another one of these marvels, but surely in the future it would make a great personal project indeed.
good luck on your amp sir
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Sir tony, I just want to upgrade my leach amp and super leach by changing those ceramics capacitor, Dr. leach recommends mica capacitor, and I'm planning to copy the pcb layout of jens, btw, sir ano na nangyari sa sample program ng ONsemi, kawawa naman ang mga diyer ng Pilipinas. buti na lang naka order pa ako ng mga power transistor 25 pcs each rail ;D(http://c:\myleachamp.jpg)
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(http://c:\myleach2.jpg)
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take your time! ;D i'm sure, pro na pro ang dating nyan! ;D
sorry, but this diy project is for me, no one commisioned me to do so i am doing it on my own time, besides i wanted to do it right! i have my sights on conrad engineering heatsinks after which the chassis follows.
when finished, it will have an idle current of 150mA at output stage for a quiscient dissipation of 15 watts, therefore this amp, will operate at about 2watts or less, class A for that bias level!
the conrad heatsinks will enable me to up the quiscient bias later should i find the need. but first i have to find them ;D
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thanks sir tony, yes I paid $20.00 for the shipment. But when i get back to order again some samples, the website tells that this country cannot process. I cant post the image of my pcb layout , paano ba sir tony? ;D
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Sir tony, the big capacitor in leach amp board is also imported or available here in Philippines? I need at least 1000uF/63V or lower capacitance but the same voltage. thanks
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Sir tony, jens' s leach amp PCB is very nice and good, thickier than PC motherboard, thanks for the freebies :),
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yes, downloaded already, although there are resistors to be defined, computations of short circuit protection.
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Sir tony, I' ll be using MJL3281A/MJL1302A and my x' former is 44-0-44V. Kay jens ba galing yung capacitor (10000 uF) nyo? At this time, I'm still looking for some parts like, fuse holder gaya sa inyo, silver mica(very costly), non polar capacitors . Thanks for the info, metal film resistor is available at alexan.
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Thanks sir tony...
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sir tony, I'll be using 44-0-44V, 20A, I don' t have the x' former yet by Pangilinan electronics enterprise. Planning to order silver mica, film capacitor, fuse holder at farnell.
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Sir tony, i didn't order yet, i'm still contemplating to use toroidal x' former. btw, what good preamp do I used in Leach amp? thanks...
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yes, sir tony, toroidal is very expensive it cost more or less 5,000 psos, at farnell rating 1kva,45-0-45V. I dont have any idea about tubes, even my instructor in electronics did not discuss about tubes, although, pwede nating pag aralan. the only thing I know about tubes, tube likes very low impedance to drive.
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Sir tony, you've got pm.
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next year na lng sir tony...
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Sir tony, thanks a lot...
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Sir 2ny, can I used Pb-free transistors?Thanks.
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MPSA56/MPSA06(MPSA92/MPSA42) and MJE350/MJE340
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Sir 2ny, can I used Pb-free transistors?Thanks.
HI, Pb-Free is just an environmental issue in Semiconductor Industries. Before plating uses Sn/Pb combination now Pb was already banned they are using either pure Sn (tin) or Silver/Gold combi some high-end products use Pt (Platinum) for any plating of lids of any IC or Transistor.
Function are not affected by Pb-free as far as i'm concern.
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HI, Pb-Free is just an environmental issue in Semiconductor Industries. Before plating uses Sn/Pb combination now Pb was already banned they are using either pure Sn (tin) or Silver/Gold combi some high-end products use Pt (Platinum) for any plating of lids of any IC or Transistor.
Function are not affected by Pb-free as far as i'm concern.
Yes, this is specially true in Europe. The directive is in FY 2006 products shipped should be lead free.
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odyopayl and rascal101, thanks
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On diyaudio.com some of us are working on an updated version of the super leach amp....
It is based on the leach layout that blackmtx mentioned
(http://www.delta-audio.com/Leach_Clone/Leach_pics/Leach_pics7.JPG)
(http://www.delta-audio.com/Leach_Clone/Leach_pics/Leach_pics5.JPG)'
Considering that I have made the layout avalible for free, please don't just copy it, make your own and make an even better one that fits what you want the amp to be like.
\Jens
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Hi Jens, welcome to Pinoy DVD!!! ;D I've got 2 pieces of your leach amp pcb courtesy of Sir Tony and still waiting for other parts to arrive.
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Jens, for your info here is my PCB layout, notice that my pcb layout is only single sided...and I used 8 TO-3 power transistors.
http://i47.photobucket.com/albums/f160/blackmtx/Leachampto3_81.jpg
and of course, I did not copy your layout.
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what is the board size? btw, i am in russia as of now, will be in manila by third week of july.
Hi sir tony, surely, pagdating nyo marami kayo pambili ng eletronics parts ;D.The board measures 4" x 7.30", I'll be using MJ21193/MJ21194(TO-3), -/+70V power supply and conrad double flanged heatsinks(MF20-2F-151.5)
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Does anyone here know of a good vocational school to learn electronics specifically for Audio applications?
i would like to pursue my passion for electronics.
i know this is out of topic. but it seems that people on this thread are knowledgeable on the subject.
any help would be appreciated.
Thanks
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I do not know of any school for Audio applications. However, should Audio electronics be of interest to you the first start would be to enroll yourself in tv/radio repair technician course. After that you can start reading up on applications of the various components used
eg Capacitors, Resistors, Transistors, MOSFET and Diodes
Since there are various types of the above components it is best to understand their applications. You can do this by scouring the net on the manufacturers website. They typically have application notes.
Still not satisfied ... you can enroll yourself at UP Diliman in their power engineering courses. Here you will get to learn about switched mode power supplies. More importantly, the potential application of above components are mostly applicable for Audio electronics. To get your spirits up, fact is a good number of people who have worked in Audio electronics feel at home with switched mode power supplies. You get to learn about phase margin (why this is very important for amp stability), feedback, EMI, transformers etc etc which you can then relate to Audio electronics.
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Thanks Rascal101.
Are the courses you reccommended vocational?
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The power electronics course in UP is about 1 year. You have to call them though to check. PM me if you are serious about this.
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Rascal101.
You sent you PM
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To all:
Just realized ... pls contact our trunkline 995-4000 and ask for Roy Closa about the power elec program. Siya nga pala iyung resource person for this. Sorry for the previous PMs, info sent ...
Rascal101
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any pics yet?
Hi, sir tony, these are some of my leach amp pix(jens pcb).
http://i47.photobucket.com/albums/f160/blackmtx/Image057.jpg
http://i47.photobucket.com/albums/f160/blackmtx/Image056.jpg
http://i47.photobucket.com/albums/f160/blackmtx/Image055.jpg
and my super leach amp and leach v4.5(Dr. W.M.Leach layout)
http://i47.photobucket.com/albums/f160/blackmtx/Image065.jpg
http://i47.photobucket.com/albums/f160/blackmtx/Image061.jpg
http://i47.photobucket.com/albums/f160/blackmtx/Image062.jpg
http://i47.photobucket.com/albums/f160/blackmtx/Image064.jpg
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sir tony, OT:
here is my apex sr.subwoofer amp pcb layout, based on the schemtic diagram posted in this website http://www.apexjr.com/Apexsenior.htm
the pcb layout:
solder side:
http://i47.photobucket.com/albums/f160/blackmtx/Image070.jpg
component side:
http://i47.photobucket.com/albums/f160/blackmtx/Image071.jpg
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ganda ng banat sa pcb ah! ;D
galing! ;)
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Sir tony, s2kov thanks... :)
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@TonyT
saan po ba nakakabili ng module ng super leach amp?
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ok tnx. kala ko anytime anywhere available dito sa atin. nga pala almost ba na supply ng leach amp single +/- voltage with ground lang ba?
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^read the thread from the start.....
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Pogi ng amp. Astig!
Wala ba ditong gustong maggroup buy ng conrad heatsink. :D
Suggestion lang. :D
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progress update on my leach lo-tim amp:
(http://i5.photobucket.com/albums/y155/leoman53/110729-006.jpg)
(http://i5.photobucket.com/albums/y155/leoman53/110729-007.jpg)
(http://i5.photobucket.com/albums/y155/leoman53/110729-009.jpg)
(http://i5.photobucket.com/albums/y155/leoman53/110729-010.jpg)
Sir TonyT, ang ganda ng amp mo sir..saan po makakabili ng MJ21193/MJ21194?
Thanks
boyet
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(http://i5.photobucket.com/albums/y155/leoman53/110729-009.jpg)
ganda nyan sir tony ah