ADA Ampulator

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ADA Ampulator

Postby Yazoo55 » 30 Sep 2016, 17:22

Has anybody got any pictures of the ADA Ampulator circuit boards? I have got the schematics but these do not include a pcb layout. Pcb layouts were included in the documents for the Microcab which I built several years ago and these were really helpful when I did my one channel version.
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Re: ADA Ampulator

Postby okgb » 02 Oct 2016, 23:19

There was a clever Australian fellow who made his one, forgot his name I could post an image of his pcb
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Re: ADA Ampulator

Postby Yazoo55 » 03 Oct 2016, 10:50

Yes please, that would be very helpful.
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Re: ADA Ampulator

Postby Fender3D » 03 Oct 2016, 12:02

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Re: ADA Ampulator

Postby Yazoo55 » 07 Oct 2016, 17:16

Thanks for the link Fender3D. What I am really after is the actual PCB with traces if this exists. I would be really keen to see the version the Australian, I think this is Curtis, built. I have started to try and recreate the original PCB layout using the parts layout and the schematics but this is really tricky.
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Re: ADA Ampulator

Postby Fender3D » 07 Oct 2016, 17:32

The file ADA-Ampulator-loading-chart.pdf contains the PCB layout.
It may be usefull if you're doing it in any CAD with schematic capture and DRC
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Re: ADA Ampulator

Postby Yazoo55 » 29 Oct 2016, 14:21

I have followed your suggestion and I am working through the schematics, using the parts layout as a guide. It will take me a while - I have never really used PCB design software before and I have found that its best to do the routing myself rather than use autoroute.

I won't be able to etch this myself. The board will be too big and it will need vias. Are there any commercial companies you would recommend? I had a quick look and there are several in China. The main board will be about 16" by 3".
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Re: ADA Ampulator

Postby okgb » 13 Nov 2016, 02:34

Yeah it was Curtis , I'll look again
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Re: ADA Ampulator

Postby Yazoo55 » 16 Nov 2016, 18:26

I am laying this out using Kicad. If I upload my work, would anybody be interested in checking it? It will be an ongoing project which will take a while.
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Re: ADA Ampulator

Postby Yazoo55 » 14 Dec 2016, 18:54

OK, I've created schematics and PCB layouts in Kicad. They won't win any prizes for elegance but I'm hoping they will be OK. I have hit one query though. In the power section, there is a 15V bipolar supply for the ICs and a section branches off linked through "MUTE" to transistors linked to the outputs. There is a reference to GND2 which does not appear anywhere else. All other references are to a standard ground (with two references to the chassis ground symbol which are used to provide a special ground for the cable carrying the audio signal between the two boards).

Should GND2 be connected to the main ground?

This is a link to the power section schematic:
Image

I would be happy to share the Kicad files. A second pair of eyes would be very useful!
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Re: ADA Ampulator

Postby okgb » 16 Dec 2016, 17:18

Excuse the delay, I found it , project went down on the cue as I stated using impulses but I found the pcb
can anyone get a hold of Curtis to make sure he's cool with it ?
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Re: ADA Ampulator

Postby Yazoo55 » 16 Dec 2016, 23:23

Great, thanks for this.
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Re: ADA Ampulator

Postby Yazoo55 » 14 Jan 2017, 14:42

I've been working away and done the top board. I used a Chinese fabricator and I am pleased with the results, though there were a couple of mistakes I made. :roll:

I ended up having to add a couple of jumper wires on the back of the board and I had to very carefully enlarge the holes for the power pins which I had set too small. I haven't been able to resolve the issue relating to GND2 and the Mute circuit so I've ducked the issue for the moment and added a jumper to the board so I can come back to this. I've left the components for this off the board. I don't really understand the purpose of the Mute circuit so if anybody can help I would be grateful. If it is optional, I'll just leave it.

I've assembled the board and tested the power supply. I am using a spare ADA MP-1 power transformer I have. This is a photo of the assembled board.

Image

I am planning on doing the main board next but this time I'm going to double-double-check it before I send it off.
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