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Old 23rd May 2002, 02:22 PM   #1
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Default My Leach amp,take a look

My Leach amp is now finished,so i take a few shots to share it with all you,who helped me and those who read this forum.

Amp have classic PCB design and i used only Motorola devices (ON),capacitors are not mica;in my country i cant find them so i use quality multylayer or ceramic caps.Amp casing was not planed i just go along and add things,as you see casing is built by Prof. Leach recomendation.(added bottom plate,25mm tick for robust look).Inbus screws adds more DIY look.Casing is made by soldering copper with 100W soldering iron.Classic design,on next project-class A more exotic housing design.
As i type this words,amp is richer by ALPS blue line pot and nice VU-meter(not yet built on these photos).This upgrade is probaly final.
Specs:-weight:15Kg total
-500VA,2x42V toroid
-6x10000uF caps total
-gold plated chinch inputs-must have these
-all metal parts are groundet to central ground point
Speakers are cheap type,made by me(german people probaly know Westra drivers)but take almost anything,like 150W amp and 100W speakers work just fine.Sure you must have good crossover.

A few words for each photo:

Photo1:
You see my DIY interconnect cables,on top right my new Marantz CD player,In the amp you see my transformer shield(probaly dont need one,but sure looks fine Above shielding is clearly seen CGP(central ground point)
Photo2:
Amp,speakers-DIY,fishing gear and what is this black thing between speakers?
Is bad photo,but who gets even close i buy him Heineken beer
Photo3
Amp insides while measuring bias current.Heat sinks i got for free predrilled,once used for some kind industrial transistors.All amps components is screwed to wood(painted black),to give extra safety and for easy mounting.Left knob was peek indikator,removed instead i built VU-meter.
Photo4
Not wery good picture,amp was polished and flash did the rest.Dumb automatic,light was just right but stupid flash turned on.Whatever...

And at the end the most important thing(this is primary cause for writing this post)-Credits
Big thanks goes to:
Klas Mälman-his copper housing is just wonderful,and he help me a lot with ansvers.
Prof. Marshall Leach-solved power supply problems.
Vili Jan-my local PCB supplier.
Swede...and all i forgot.

Feel free to post your comments,good or bad dont matter.

My next project?Maybe class A,who knows...

Photo1
Click the image to open in full size.

Photo2
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Photo3
Click the image to open in full size.

Photo4
Click the image to open in full size.
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Old 23rd May 2002, 02:46 PM   #2
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you could put a few more pictures in your post next time

but maybe a bit smaller,

william
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Old 23rd May 2002, 05:59 PM   #3
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Some people cant see photos,are all photos visible?
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Old 23rd May 2002, 09:58 PM   #4
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Hello Igor!

Sorry to say that i cant se any pictures.... It looks like those images is linked to your local machine(on volja.net), instead of beeing attached to the forum....
Make another try to post them...
Looking forward to see the pictures...

Anyway, thanks for the creds... =)



/Klas
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Old 24th May 2002, 12:51 PM   #5
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All you who cant see pictures,try these links:
I think there is problem with my local server,slow speed.
photo1
photo2
photo3
photo4
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Old 24th May 2002, 12:57 PM   #6
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Old 24th May 2002, 12:58 PM   #7
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Old 24th May 2002, 12:59 PM   #8
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Old 24th May 2002, 01:03 PM   #9
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Old 24th May 2002, 04:15 PM   #10
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shadow, why have you shielded the toroide with copper? Isn't it more sensible to use a magnetic material in order to shield magnetic field? I think it's looks nice with copper though.

(... and of course....you have isolated the bult from the copper...otherwise big problems for those who don't know)
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