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.
All you who cant see pictures,try these links:
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Feel free to post your comments,good or bad dont matter.
My next project?Maybe class A,who knows...