The Multi Amp aka Dynalo Mk2

[sbelyo]

thanks...

Hammond mfg will cut the 1455T2202 to length with a minimum of 25 pieces.  I was thinking of going that route but don't want 25.  The case pars found is nice as well.  I'm in for either one

[muskyhuntr]

I would be in for either one.

 

Me

[cspirou]

On 10/25/2016 at 3:56 AM, Pars said:

I sent an email to Context Engineering regarding their 6008H-8.5N case (8.5" long) and whether they could cut them to 6.8" (or 6.840") for this application.

I have not followed up with them yet.

 

I asked last week about their desktop enclosure and got a quote. Although the split body seems like a better idea.

The dimensions might not be totally correct but the price should still be valid. I requested quotes for no cutouts as well as 6 holes in front and 5 holes in the rear. I asked for quantities up to 100 but there isn't much difference between 50 and 100 so I'll just go up to 50.

P/N & Description: 175DT desktop enclosure 5”W x 6.8”D x 1.720”H, 6 part enclosure, screws included, no cutout, no markings

 

Qty: 1          Price: $213.30 each set          Finish: natural aluminum (no finish)

Qty: 1          Price: $333.30 each set          Finish: black anodize

 

Qty: 5          Price: $85.90 each set           Finish: natural aluminum (no finish)

Qty: 5          Price: $117.90 each set          Finish: black anodize

 

Qty: 10         Price: $66.80 each set          Finish: natural aluminum (no finish)

Qty: 10         Price: $98.80 each set          Finish: black anodize

 

Qty: 25         Price: $54.30 each set          Finish: natural aluminum (no finish)

Qty: 25         Price: $85.50 each set          Finish: black anodize

 

Qty: 50         Price: $44.70 each set          Finish: natural aluminum (no finish)

Qty: 50         Price: $73.50 each set          Finish: black anodize

 

P/N & Description: 175DT desktop enclosure 5”W x 6.8”D x 1.720”H, 6 part enclosure, screws included, with cutouts, no markings

 

Qty: 1          Price: $261.30 each set          Finish: natural aluminum (no finish)

Qty: 1          Price: $381.30 each set          Finish: black anodize

 

Qty: 5          Price: $95.90 each set           Finish: natural aluminum (no finish)

Qty: 5          Price: $127.90 each set         Finish: black anodize

 

Qty: 10         Price: $76.80 each set          Finish: natural aluminum (no finish)

Qty: 10         Price: $108.80 each set        Finish: black anodize

 

Qty: 25         Price: $64.00 each set          Finish: natural aluminum (no finish)

Qty: 25         Price: $95.20 each set          Finish: black anodize

 

Qty: 50         Price: $53.70 each set          Finish: natural aluminum (no finish)

Qty: 50         Price: $82.50 each set          Finish: black anodize

[Kerry]

I did a small update on the mini board to add a pad on the opposite side of the on board regulators.

Here's and updated view...

[sbelyo]

This will be included in the group buy

[nopants]

I'm also interested in an enclosure group buy if possible.

[sbelyo]

I have no problem running it


Sent from my iPhone using Tapatalk

[cspirou]

What is the max power this can do? Either the mini or the regular one.

I read in the thread that it can push 2.5W into 50 ohms class-A. Can you push it further into class-AB or is this purely class-A?

[kevin gilmore]

updated board file

 

[palchiu]

About SS Dynalo Mini, after adjust properly then soldering servo opamp?

 

[Pars]

I wouldn't solder it in, but I use good sockets. Your call however.

[kazcou]

On aliexpress there is a vendor (breeze audio) who can do a customized chassis, but you need to order a minimum of 30 pieces.

 

 

[nopants]

Does anyone have a BOM for the transportable version going? I'm trying to place an order to intercept the board arrival.

On a side note I like the switching supplies only costing ~11 a pop

[Pars]

I thought Kerry had posted a BOM for this? Here is the one I have from Kerry's .

kerry mini ssdynalo-v1-4.xlsx

[RudeWolf]

Mouser parts here - http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=497a265867

[GrindingThud]

2 hours ago, RudeWolf said:

Mouser parts here - http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=497a265867

What would be the best hand technique to solder that regulator?

[GrindingThud]

Had difficulty finding the schematic for the mini in the usual place, is it posted? Trying to figure out how to configure the jumpers on the regulator given the IPM-15-24, choose the right output bias resistors (in the 255 spot) for a given jumper setting, and the AOT thingy. 

[kevin gilmore]

No schematic for the power supply that Kerry did. Unless he has it.

 

[GrindingThud]

3 minutes ago, kevin gilmore said:

No schematic for the power supply that Kerry did. Unless he has it.

 

Ok, thanks!

[Kerry]

Here are the schematics:

 

 

I've got to look up the settings again for the positive rail. I'm running out in a bit so may need to do it later.

EDIT:  Ok so the silk screen should read 14.2V before you start bridging the jumpers.  You should bridge 3P2V, 1P6V, 0P8V, 0P2V for a 20V output.

Also, updated schematics to make them higher resolution.

Edited December 17, 2016 by Kerry

[GrindingThud]

Thanks Kerry!

[GrindingThud]

In going through the BOMs I noticed R53 listed as 160K and on the PS schematic and silkscreen on the negative sense line labeled as 1.43M.

I'll list more as I find them.

Edited December 17, 2016 by GrindingThud

[Kerry]

Use the values in the BOM.

[GrindingThud]

Just now, Kerry said:

Use the values in the BOM.

got it

[Kerry]

Also R1 and R3 should go to to 424 ohms.  I also want to double check the LEDs in the bom as well.  I can look at that when I get home later.