New Aleph Mini PCB GB

[pinkmouse]

I'd leave out the pcb mount IEC, and use a normal chassis version. The pcb mount versions are always coming loose from the board. I've lost count of the ones I have had to fix in pro gear.

If you've got a sketch of your potential softstart circuit, I'll draw up a schema in Eagle for Jason to have a go with.

 

[jleaman]

I'd leave out the pcb mount IEC, and use a normal chassis version. The pcb mount versions are always coming loose from the board. I've lost count of the ones I have had to fix in pro gear.

If you've got a sketch of your potential softstart circuit, I'll draw up a schema in Eagle for Jason to have a go with.

That would be sweet save me the time and you could pick the apropriate parts to be used then when i get home i can jump onto a board layout : O )

 

[steenoe]

I will reconsider it.

Brian, This is almost too much Nonetheless I think this addition wil benefit a lot of people. I am sure a lot of Newb's are gonna try this one, and the fuse board is gonna hand them some kind of protection I hope also that the mentioned noob's will read the intire thread Please let us have a BOM for the Softstart ASAP.
I am very happy about this thread so far
Except for a few excuses

Steen.

 

[BrianGT]

I'd leave out the pcb mount IEC, and use a normal chassis version. The pcb mount versions are always coming loose from the board. I've lost count of the ones I have had to fix in pro gear.

If you've got a sketch of your potential softstart circuit, I'll draw up a schema in Eagle for Jason to have a go with.

I can easily make a layout, but I don't have a schematic. If I had more spare time, I would work up a design and prototype it.

Ideally, the design would consist of a debounce circuit and a flop-flop, which controls a high current relay.

Rob's design is great, but I don't want to have to use SMD parts:
http://maxhawk.flagshiphosting.com/projects/Ampturnon/index.html

I guess a classis cross-coupled pair of nand gates would work for the debounce.

--
Brian

 

[pinkmouse]

I'll see what I can do in the next few days. I'm at a bit of a lull due to waiting for parts to arrive anyway.

 

[troystg]

I don't need many more amps for now...... hows about some preamp boards for a change! Pleezeeeeee.....


Mark

Hey Mark-

Ask Pavel to sell you a set of his "audio buffer" PCB's. I doubt you would be disappointed.

Post # 7, 9, 11 & 14

14 has the specs of the circuit


http://www.diyaudio.com/forums/showthread.php?postid=525043#post525043

 

[Dennis Hui]

[... I already have a Mini-A, a pair of Aleph 2's, and a KSA-50 here.... I don't need many more amps for now...... hows about some preamp boards for a change! Pleezeeeeee.....


Mark [/B]

That's quite a collection you have there. I had enough trouble
bulding just one amp.

Yeah, a preamp project would be fun...

 

[Mark A. Gulbrandsen]

Yea, people seem to shy away from preamps for some reason or other. I am using a Rosenblatz Grounded Grid at home now and I have yet to own anything that comes even close to it. Sure, it has room for improvement but is an amazing piece of work. It only cost 90 bucks to build it P to P! One thing that makes it easier for me to build amps is that I am lucky to have access to a full machine shop at my leisure.... Some days or on weekends I just stay at work and work on them!

I will check out Pavel's stuff.

Mark

 

[jleaman]

Yea, people seem to shy away from preamps for some reason or other. I am using a Rosenblatz Grounded Grid at home now and I have yet to own anything that comes even close to it. Sure, it has room for improvement but is an amazing piece of work. It only cost 90 bucks to build it P to P! One thing that makes it easier for me to build amps is that I am lucky to have access to a full machine shop at my leisure.... Some days or on weekends I just stay at work and work on them!

I will check out Pavel's stuff.

Mark

Access to a machine shop huh. WOW i wish i was there i have a super super idea for my stereo blocks for my aleph mini's

 

[Jean]

Yea, people seem to shy away from preamps for some reason or other. I am using a Rosenblatz Grounded Grid at home now and I have yet to own anything that comes even close to it. Sure, it has room for improvement but is an amazing piece of work. It only cost 90 bucks to build it P to P! One thing that makes it easier for me to build amps is that I am lucky to have access to a full machine shop at my leisure.... Some days or on weekends I just stay at work and work on them!

I will check out Pavel's stuff.

Mark

Full machine shop ?

 

[Coulomb]

hows about some preamp boards for a change! Pleezeeeeee.....

Kari is working on a CCS X BOSOZ in a dula MONO configuration. Can be found under the heading "Heatsinks for BOSOZ"

Anthony

 

[jleaman]

Kari is working on a CCS X BOSOZ in a dula MONO configuration. Can be found under the heading "Heatsinks for BOSOZ"

Anthony

http://www.diyaudio.com/forums/showthread.php?s=&postid=604227#post604227

here..

 

[RKH]

Mini-A transformer

Has any one found a suitable transformer for the mini-A? Avel (the ratings carried by Parts Express don't seem to fit the bill)? Plitron? Custom from Victorina Magnetics?

Just checking to see what folks are thinking.

Thanks,
Ryan

 

[jleaman]

Re: Mini-A transformer

Has any one found a suitable transformer for the mini-A? Avel (the ratings carried by Parts Express don't seem to fit the bill)? Plitron? Custom from Victorina Magnetics?

Just checking to see what folks are thinking.

Thanks,
Ryan

i phoned plitron yesterday for a

10-0-10 @500va they wanted 135.00 canadian with out shipping

OUCH!!!

Brian said when i asked him about 60$ Us i believe from Victoria magnetic's.

 

[Coulomb]

Check out this transformer, one per channel should be plenty.

182S12-ND from Digikey about $76 CAD, $61US I purchased two for my Aelph-X.

Power=Volt Amp (VA) 225
Secondary In Parallel 12VAC@18.76A

Regards

Anthony

 

[RKH]

Transformer options

I just looked at the Avel site:

http://www.avellindberg.com/transformers/y23_range_specs.htm

A few options exist there, but no prices are listed. I have, in the past, recieved quick response from them for requests for a quote.

 

[jleaman]

Check out this transformer, one per channel should be plenty.

182S12-ND from Digikey about $76 CAD, $61US I purchased two for my Aelph-X.

Power=Volt Amp (VA) 225
Secondary In Parallel 12VAC@18.76A

Regards

Anthony

Maybe 2 of those per stereo amp : O ) Brian suggested 500va for a stereo block.

 

[Mark A. Gulbrandsen]

Victoria Magnetics would be the least expensive but still high quality route to go. I had them wind a 2X15 @ 320 VA for my Mini and it was about 65.00 plus shipping.

Mark

 

[jleaman]

Victoria Magnetics would be the least expensive but still high quality route to go. I had them wind a 2X15 @ 320 VA for my Mini and it was about 65.00 plus shipping.

Mark

I need to buy 3 of them and sell my aleph 2 victoria magnetics ones

I haev 2 1kva brand new never used Vm trannys used for briangt's aleph 2 boards for a aleph 2.. humm wonder if any one needs them..

 

[pinkmouse]

Ok folks

I have been researching options for the softswitch board mentioned earlier, and as it requires various logic chips there will be gates left over as they tend to come in multiples of four or more.

So that got me thinking- should we split this project out of the MiniA thread and make a complete amp control module, with soft switch, soft start, dc and temperature protection? I am quite willing to design and prototype this, but as I am limited to the free version of Eagle I cannot really lay out the boards, as they will likely be too big, especially if we use a pcb mounted transformer.

Thoughts?