Mini-A PCB's

Thomas · 21st October 2002, 04:07 PM

Hi

I have made a board for the Mini-A and would like to hear some opinions on the layout.

I have added protection diodes on the input and the possibility of bypass caps for the electrolytics. The board are two layer. The top layer hold the ground level and the bottom holds the signal and power.

Here's a picture of the layout. The actual films will be posted in a zip file when I decide not to change them any more (a day or so).

Thomas · 21st October 2002, 04:09 PM

And the schematic:

Peter Daniel · 21st October 2002, 04:17 PM

If this is the final board's size, I would place the output Fets as close to the edge as possible for direct mounting to the heat sinks. As it is now, wires are required.

skaara · 21st October 2002, 05:30 PM

Is mini-A a normal mini aleph, or is there something more?

BrianGT · 21st October 2002, 08:29 PM

Thomas,

In addition to putting the output devices closer the the edge of the board, I like to have the outputs positioned closer to the edge. I also don't like resistors placed vertically since it puts more strain on the resistors and the pcb. It wouldn't take up much more space with them positioned vertically. Also, you can get away without a heatsink for Q1 - Q3, but I would leave room for heatsinks, and possibly putting Q1 and Q3 on a shared heatsink (with insulators) for better thermal tracking. The only other suggestion that I have is that you could leave more spacing for the caps, in case you decide to try some exotic caps later. (there are only a couple used, so the cost could be justified).

skaara,

read the thread on the Mini-A here:
The Mini-A

It is a creation by Grey ~9 months ago. Basically it is a small aleph with +-15v rails, drawing 1 A. It is a scalable design as are the rest of the Aleph designs.

--
Brian

Thomas · 22nd October 2002, 02:34 PM

Peter, Brian

Thanks a lot for your input!

So, here are the much cleaner layout.

Featuring:

More room for power resistors, room for heatsinks on Q1-Q3, output devices on edge. Option for protection diodes on input ( 9.1V zener). Multiple holes for the cap of your choice.

The board are two layers, the top is the ground level. Of course you could easily use a wire instead, because there are only five or so ground connections.

Note: you have to download all three parts of the zip. Final size =202kb. Print films are in PDF format and should print correct size at 600 dpi.

I must say that I haven't build the boards yet, so they are UNTESTED. Don't kill me if they don't work, kill your cat.

Good luck bulding!

Thomas · 22nd October 2002, 02:36 PM

1.file:

Thomas · 22nd October 2002, 02:44 PM

2. file:

Rename to: Spanned.z01

Thomas · 22nd October 2002, 02:45 PM

3. file:

Rename to Spanned.z02

Thomas · 22nd October 2002, 03:13 PM

AAArgh!

The spanned zip files didn't work and my 30 minuttes of editing time are gone, so here are some new files to try:

21st October 2002, 04:17 PM	#3
Peter Daniel diyAudio Member Join Date: Jul 2002 Location: Toronto, Canada	If this is the final board's size, I would place the output Fets as close to the edge as possible for direct mounting to the heat sinks. As it is now, wires are required. __________________ www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC

22nd October 2002, 02:34 PM	#6
Thomas diyAudio Member Join Date: May 2001 Location: Right here	Finished PCB's for Mini-A Peter, Brian Thanks a lot for your input! So, here are the much cleaner layout. Featuring: More room for power resistors, room for heatsinks on Q1-Q3, output devices on edge. Option for protection diodes on input ( 9.1V zener). Multiple holes for the cap of your choice. The board are two layers, the top is the ground level. Of course you could easily use a wire instead, because there are only five or so ground connections. Note: you have to download all three parts of the zip. Final size =202kb. Print films are in PDF format and should print correct size at 600 dpi. I must say that I haven't build the boards yet, so they are UNTESTED. Don't kill me if they don't work, kill your cat. Good luck bulding!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Mini-A PCB'S	sandstorm33	Pass Labs	3	23rd March 2008 11:39 PM
the Very Mini Magico Mini	zei	Multi-Way	7	11th February 2008 08:10 PM
My new mini-A. I really like it!	mpmarino	Pass Labs	20	3rd August 2005 02:37 AM
New Mini	MikeW	Pass Labs	39	7th June 2004 02:10 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

21st October 2002, 05:30 PM	#4
skaara diyAudio Member Join Date: Jun 2002 Location: Europe, Slovenia	Is mini-A a normal mini aleph, or is there something more?

21st October 2002, 08:29 PM	#5
BrianGT diyAudio Moderator Emeritus Join Date: Jan 2002 Location: near Atlanta, GA	Thomas, In addition to putting the output devices closer the the edge of the board, I like to have the outputs positioned closer to the edge. I also don't like resistors placed vertically since it puts more strain on the resistors and the pcb. It wouldn't take up much more space with them positioned vertically. Also, you can get away without a heatsink for Q1 - Q3, but I would leave room for heatsinks, and possibly putting Q1 and Q3 on a shared heatsink (with insulators) for better thermal tracking. The only other suggestion that I have is that you could leave more spacing for the caps, in case you decide to try some exotic caps later. (there are only a couple used, so the cost could be justified). skaara, read the thread on the Mini-A here: The Mini-A It is a creation by Grey ~9 months ago. Basically it is a small aleph with +-15v rails, drawing 1 A. It is a scalable design as are the rest of the Aleph designs. -- Brian

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)