I have not completed mine yet, but I did
complete the pcb layout with some
extra goodies.
http://home.pacbell.net/lordpk/amplifier/pcb/all-layers.jpg
When you are done, can you post
some feedback on the sonics of this
amplifier and any improvements you
might think it needs.
I'm too busy working on the speaker
project and put the amplifier project
on hold.
complete the pcb layout with some
extra goodies.
http://home.pacbell.net/lordpk/amplifier/pcb/all-layers.jpg
When you are done, can you post
some feedback on the sonics of this
amplifier and any improvements you
might think it needs.
I'm too busy working on the speaker
project and put the amplifier project
on hold.
If you send me an email, I can send
you the gerbers and document.
The document is about 99% complete
which includes information from Holton's
AV800 document and includes the protection circuits I added.
The problem is... My document is almost
10 megs in Microsoft Word format,
so you need a Word reader minimum
and your email needs to support a
10 meg file for me to send. /heh/
The document I have doesn't include
the parts list for the protection circuits,
I've been kinda busy with other stuff...
but all the schematics are there.
Warning - Even though Anthony Holton
claims his AV800 - 1KW amplifier works,
I have not actually verified it. I took
the leap of faith that it works and
created the layout for 14 transistors
per rail. (Holton 1KW was tested with
10).
I was hoping to wait for others to build
their own AV800 so I can get feedback,
perhaps to improve the design. To fabricate 4 layer pcb's I need to spend
between $1500 - $2000 for the initial
order, so I'd rather wait to make sure
a prototype works well and sounds good.
Holton said the AV800-1KW works
with +110v rails, but actually it
was +96v when loaded.
1600w @ 2 ohms short term.
I think with the extra transistors,
slight lowering of rails, maybe 90v,
and massive heatsink, it should
drive 2 ohms, maybe even 1 ohm
music (not continous tones).
I use this software.
http://www.mentor.com/pads/powerpcb/
There was AV800 discussion here.
http://www.diyaudio.com/forums/showthread.php?threadid=16133&highlight=av800
my email
lordpk@pacbell.net
... and just for giggles, I stretched the model 2800 PCB and made it longer, added more transistors and more capacitors... 40 transistors on the
board (one channel), I call it model
4000. I don't really plan to make this
... yet .. and I have no idea if the buffer
stage can drive 20 transistors...
My speaker project has been consuming
me for the past few years, most of
my effort is spent there. This amplifier
project was suppose to be next years
project for me... But I found some time
to get some of it done, but not all.
you the gerbers and document.
The document is about 99% complete
which includes information from Holton's
AV800 document and includes the protection circuits I added.
The problem is... My document is almost
10 megs in Microsoft Word format,
so you need a Word reader minimum
and your email needs to support a
10 meg file for me to send. /heh/
The document I have doesn't include
the parts list for the protection circuits,
I've been kinda busy with other stuff...
but all the schematics are there.
Warning - Even though Anthony Holton
claims his AV800 - 1KW amplifier works,
I have not actually verified it. I took
the leap of faith that it works and
created the layout for 14 transistors
per rail. (Holton 1KW was tested with
10).
I was hoping to wait for others to build
their own AV800 so I can get feedback,
perhaps to improve the design. To fabricate 4 layer pcb's I need to spend
between $1500 - $2000 for the initial
order, so I'd rather wait to make sure
a prototype works well and sounds good.
Holton said the AV800-1KW works
with +110v rails, but actually it
was +96v when loaded.
1600w @ 2 ohms short term.
I think with the extra transistors,
slight lowering of rails, maybe 90v,
and massive heatsink, it should
drive 2 ohms, maybe even 1 ohm
music (not continous tones).
I use this software.
http://www.mentor.com/pads/powerpcb/
There was AV800 discussion here.
http://www.diyaudio.com/forums/showthread.php?threadid=16133&highlight=av800
my email
lordpk@pacbell.net
... and just for giggles, I stretched the model 2800 PCB and made it longer, added more transistors and more capacitors... 40 transistors on the
board (one channel), I call it model
4000. I don't really plan to make this
... yet .. and I have no idea if the buffer
stage can drive 20 transistors...
My speaker project has been consuming
me for the past few years, most of
my effort is spent there. This amplifier
project was suppose to be next years
project for me... But I found some time
to get some of it done, but not all.
thylantyr said:
If you use a compression sw like winzip (http://www.winzip.com/ddchomea.htm) I bet you could reduse the size to 1/10 or somthing. Would make it easyer to email.
thylantyr said:
Hi, I'm not sure if this will be useful for you (your PCB may be too large to take advantage of this offer), but there is a company here in the UK which will make a four layer PCB up to 315 x 240mm in size for only 220 GBP (about $410, not including VAT and delivery) which may be a lot cheeper for you to do if you only want one or two baords made.
You can find their website here (click on the prototype section to see what prices they offer on various PCB sizes), which may not look like much, but I have used them before and their service was great.
I haven't done any work on this project other than the initial
pcb layout. I'm working on other things first.
But I noticed that Holton is back into the audio thing,
his website says.
24th Feb 2004
I will be featuring the progressive constuction of a Mono 1kw
Amplifier into a wind tunnel chassis and a 1600 watt amplifier in a
stereo wind tunnel version. You will see the first photos in few days.
Sounds like a fun project.
http://www.aussieamplifiers.com/
pcb layout. I'm working on other things first.
But I noticed that Holton is back into the audio thing,
his website says.
24th Feb 2004
I will be featuring the progressive constuction of a Mono 1kw
Amplifier into a wind tunnel chassis and a 1600 watt amplifier in a
stereo wind tunnel version. You will see the first photos in few days.
Sounds like a fun project.
http://www.aussieamplifiers.com/
I'll send you the docs this weekend. Perhaps you can look
at the layout and offer tips.
I haven't done any circuit modifications of the AV800 other than
drawing your schematic in Orcad using 14 output transistors per
rail and 470uf caps next to each transistor. After spending
long hours on layout, I could not shrink the PCB layout size any
further and the net result was that I could fit as much as
14 transistors per rail. /hehe
I was hoping that you could offer some advice if the buffer
stage could drive 14 transistor per rail ? This was one of
the big mysteries of this project.
Since my audio roots are car audio, I was inspired by car audio
amplifier designs where the whole amplifier is a single PCB and
the transistors are mounted on the edge of the board. My plan
was to mount the PCB on the heatsink using standoffs. I wanted
to mimimize point to point wiring.
I added two beefy Molex connectors for power input and
speaker output and input signal terminal block to the layout.
I added some external protection circuits to the pcb design using
a speaker relay and the mechanism to disconnect the speaker
from the amplifier. These circuits and relay occupy a good chunk
the layout and I often wondered if I should do another layout
with a seperate protection circuit board. With pcb layout, there
are many ways to accomplish a goal. /hehe
The pcb layout is sorta esoteric in nature, 4 layer pcb with a
strange ground plane where I try to steer the noisier current
away from the more sensitivity areas. This is purely artistic.
Other artistic ideas was to place some status LED's for the
protection circuits. I have a couple of 'off the wall' protection
circuit ideas and also integrated 'public domain' protection
circuits that are common.
I built the Rob Elliot clipping detector and found it very nice
and added that circuit too.
I wanted to use esoteric capacitors like polypropylene caps
so I created larger capacitor footprints and I also added space to
allow the installation of the controversial "Black Gate" capacitor
in the feedback loop.
On the drawing board, I have a 22 driver speaker design that
I'm working on, very slowly and I require 14 amplifier channels,
hence the motivation to build my own PCB's using a known
good amplifier design like the AV800. But I stopped right here
and have not fabricated the boards, I wanted to build a working
AV800 first so I can hear the amplifier. I still have two of your
AV800 PCB's that I ordered a few years back, but I haven't
started working in it. I have bench test power supply ready
to go, but I've been lazy on building the amplifier section. /hehe
I might have gone overboard by adding too much but
perhaps you can look at it from another point of view and
tell me what you think. I like to build crazy projects and
I tend to think big.
at the layout and offer tips.
I haven't done any circuit modifications of the AV800 other than
drawing your schematic in Orcad using 14 output transistors per
rail and 470uf caps next to each transistor. After spending
long hours on layout, I could not shrink the PCB layout size any
further and the net result was that I could fit as much as
14 transistors per rail. /hehe
I was hoping that you could offer some advice if the buffer
stage could drive 14 transistor per rail ? This was one of
the big mysteries of this project.
Since my audio roots are car audio, I was inspired by car audio
amplifier designs where the whole amplifier is a single PCB and
the transistors are mounted on the edge of the board. My plan
was to mount the PCB on the heatsink using standoffs. I wanted
to mimimize point to point wiring.
I added two beefy Molex connectors for power input and
speaker output and input signal terminal block to the layout.
I added some external protection circuits to the pcb design using
a speaker relay and the mechanism to disconnect the speaker
from the amplifier. These circuits and relay occupy a good chunk
the layout and I often wondered if I should do another layout
with a seperate protection circuit board. With pcb layout, there
are many ways to accomplish a goal. /hehe
The pcb layout is sorta esoteric in nature, 4 layer pcb with a
strange ground plane where I try to steer the noisier current
away from the more sensitivity areas. This is purely artistic.
Other artistic ideas was to place some status LED's for the
protection circuits. I have a couple of 'off the wall' protection
circuit ideas and also integrated 'public domain' protection
circuits that are common.
I built the Rob Elliot clipping detector and found it very nice
and added that circuit too.
I wanted to use esoteric capacitors like polypropylene caps
so I created larger capacitor footprints and I also added space to
allow the installation of the controversial "Black Gate" capacitor
in the feedback loop.
On the drawing board, I have a 22 driver speaker design that
I'm working on, very slowly and I require 14 amplifier channels,
hence the motivation to build my own PCB's using a known
good amplifier design like the AV800. But I stopped right here
and have not fabricated the boards, I wanted to build a working
AV800 first so I can hear the amplifier. I still have two of your
AV800 PCB's that I ordered a few years back, but I haven't
started working in it. I have bench test power supply ready
to go, but I've been lazy on building the amplifier section. /hehe
I might have gone overboard by adding too much but
perhaps you can look at it from another point of view and
tell me what you think. I like to build crazy projects and
I tend to think big.
What happened to Dreadlordpk???
Hey i got a copy of some information about a 2800 amplifier from Dreadlordpk's website and i was going to look at the board layout but now it doesnt work. Anyone know what happened to him or where I can get some copies of his work?
Anthony, I love your work, what is your reservations about copy rights on your circuitry and reproduction? I'd really like to re-engineer some PCB's, but I am weary of selling without your consent.
Hey i got a copy of some information about a 2800 amplifier from Dreadlordpk's website and i was going to look at the board layout but now it doesnt work. Anyone know what happened to him or where I can get some copies of his work?
Anthony, I love your work, what is your reservations about copy rights on your circuitry and reproduction? I'd really like to re-engineer some PCB's, but I am weary of selling without your consent.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.