Hello! I'm going to build a new power amp to my new purchased speakers, I've been looking for good schematics on the net but I need a lot of watts, so the only thing I've found is this: 
Link removed as this project is lethal.
but the only people sheer is that it is "dangerous" to build but I want someone to see if it really works, I have built many smaller amps and have repaired all sorts of electronics whole life so I'm no amateur in the subject.
I also know that it is illegal to build in some countries. and that it is un-insulated against AC-net in some parts, so the only thing I want is a professional judgment if it really works
Or if anyone knows any others simmlar schematics that works
Sorry for bad english
/ / Kim
Link removed as this project is lethal.but the only people sheer is that it is "dangerous" to build but I want someone to see if it really works, I have built many smaller amps and have repaired all sorts of electronics whole life so I'm no amateur in the subject.
I also know that it is illegal to build in some countries. and that it is un-insulated against AC-net in some parts, so the only thing I want is a professional judgment if it really works
Or if anyone knows any others simmlar schematics that works
Sorry for bad english
/ / Kim
Last edited by a moderator:
You could IF you used the proper rated input transformer, connect the grounding correctly and insure that the speaker is always insulated. If the speakers can't guarantee insulation then you have to use an insulated output transformer. The whole issue is that if parts of the circuit are not isolated from mains then electrocution between the circuit and earth GND can be quite easily acomplished. 
One solution is a properly rated SMPS. It seems to me that for this much power, you either have a large heater or you would go with a class D type circuit or a switching rail follower power supply.
One solution is a properly rated SMPS. It seems to me that for this much power, you either have a large heater or you would go with a class D type circuit or a switching rail follower power supply.You're being MUCH too nice. That contraption is a death waiting to happen. The irony is that the transformer is an autotransformer which is already pretty big. How much bigger would it be with a properly isolated secondary?
G²
Obviously you are setting your goal much too low. A 50 KW amp ought to be goal
Okay thanks for the quick response!
Is there anyone else who has reached similar schematics that works then or they are difficult to get hold of? they are expensive and difficult to build is not important only that they work well, I've found schematics that put out around 1.500 watts / CH that seems to work, and would do if I did not get something else
or is there anyone who knows any other site there i can look?
/ / Kim
Is there anyone else who has reached similar schematics that works then or they are difficult to get hold of? they are expensive and difficult to build is not important only that they work well, I've found schematics that put out around 1.500 watts / CH that seems to work, and would do if I did not get something else
or is there anyone who knows any other site there i can look?
/ / Kim
Indeed !Which is why I've taken the very unusual step of editing a post. The link in the first post has been removed.
As long as the discussion keeps to normal amplifiers (safe isolated transformer powered) then the thread will stay open.
What do need 5000 watts for anyway
Unless you have access to extremely cheap surplus parts, it's generally cheaper to buy a used power amp. They can be worth buying just for the parts alone, since big heatsinks, transformers, filter caps, and cases cost a lot if you're buying them in small quantities.
The Behringer digital amp is worth a look. Also those digital amp modules from places like Digital amplifier modules from CAD AUDIO DK
The Behringer digital amp is worth a look. Also those digital amp modules from places like Digital amplifier modules from CAD AUDIO DK
The case is worth a bit too. Having to hack out mains sockets etc on a new chassis is a real pain.
I sometimes use PC cases for amplifiers. It has a mains input socket and holes for fans.
Take care when buying second hand smoothing capacitors as it is likely they are approaching the end of their life.
What do need 5000 watts for anyway
totally. hence my retort - go for 50 KW amp! [insert nasty sarcastic laugh here]
".......... it's generally cheaper to buy a used power amp"
and tons of fun to rip apart, too!
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