Industrial SMD Gainclone - group buy

[jan.didden]

Per-Anders,

Nice. What software do you use for this type of (integrated) development?

Jan Didden

 

[peranders]

RUN Electronic Design System run on Macintosh (12000 USD!)

http://www.diyaudio.com/forums/showthread.php?s=&postid=357738&highlight=#post357738

 

[kensetsu]

What do you say about a SMD Gainclone project in August, September?

Project name is "Industrial Gainclone", QRP02

For this I would like a few beta testers which of course will be rewarded.

Specifications:

* 50 um pcb with groundplane

* Rectifier diodes, TO247 and option for TO220

* 4700 uF/50V max, 10 mm snap-in and regular ones too.

* LM3886, inverting, 1k+18k, properly decoupled

* Mute

* Output filter, 1.5 mm wire, 5 mohms

* Zobel network

* DC-servo, AD8620, properly decoupled (possible not to use it)

* Input buffer, non-inverting, 220 kohms input impedance, AD8620, properly decoupled.

* 7812, 7912, TO220, maybe SO08, maybe LM317/337 in SOT223 (not desided yet)

* All elctrolytic caps hole mounted

* SMD caps PPS types and ceramics, 0805

* SMD resistors, 0805

* Lug connectors with option for 1.5 mm2 wires

* Fuses 5 x 20 mm

The goal is a complete product, just add two windings with AC, signal in and speaker out and a cute small pcb.

I'm going to vacation now and after my vacation I will start a wiki to see how the interst is. This first list doesn't mean any commitments. It just to see the interest. I think i will have at least 50 pcb's in order for moving further.

This project is only for persons that are rather handy with soldering iron so if you think my other SMD projects are too hard to build, this one is equally hard. Personally I think it is going to be rather easy, just 0805, and SO08 parts.

Please excuse me, but I don't have a lot of experience with this web site. I'm confused. Are you selling boards for a gain clone amp?

Thanks, Nick

 

[peranders]

In short yes!

Check the wiki page and also the group buy directions in my signature below.

 

[peranders]

I notice that the interest is up to 44 pcb's which isn't bad for being a SMD project. I notice also that over 500 downloads of the documentation has been made so I'll gather there are lot's of curious people at least.

I plan to order prototype pcb's when I'll come back, 6th September.

 

[peranders]

There have been questions about my beta testing. I have added some info about this on the wiki page. People that are willing to build the very first amps may do so under certain conditions. More info on the wiki page.

 

[peranders]

Pcb's are ordered now.

 

[peranders]

I have added a column at the wiki page for beta testers. Please sign up if you interested in testing the first prototypes. It's also wanted that you can manage most of the building yourself and also trouble shooting. I will build the very first prototype but still it can be bugs in the pcb.

 

[peranders]

I will have the first prototype pcb's on Friday 24th

 

[jackinnj]

Peranders -- do you have a 3D or topological diagram of the board with parts mounted.

Since it's surface mount for the passive components, I am thinking that the chip itself could be mounted parallel to the board by bending the pins 90 degrees. A 2 or 3 c/w heat-sink could be mounted to the chip via double-sided thermal tape. The sink itself supported by 4-pins on the board. This would lend itself to a nice flat-pack design.

Jack

 

[peranders]

Sorry, no 3D picture... but the boards are here! I think it's quite possible to bend the LM3886.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[peranders]

What do you think? Will it work?

 

[byteboy]

They sure are LOOKING verry good!!!

Nice job!!

 

[jackinnj]

just a suggestion on photography of a PCB -- if you have the light glance the surface at a 45 degree angle the pads will "sparkle" instead of appear black -- a few years ago I worked with a guy who had a business photographing jewelry. shooting diamonds or rhinestones is not easy.

 

[peranders]

The pictures comes from a scanner. Later there will be pictures looking the way they usually do from me.

 

[peranders]

The first two pcb's are now delivered to "gewa" so this mean that this beta building has officially started. I myself haven't got the time to do anything.

 

[VT67]

Hi P-A

I'm a bit nervous now for being the guy that makes the kick-off. In the picture you can see that I almost have all the parts to start this project. I believe I have to januari so I can claim my surprise, which was a car if i'm not mistaken?
Keep you posted.

Cheers

Walter

 

[peranders]

Don't be nervous If you are normal handy you will solder one pcb in max an hour = 2 hours. If you are REALLY thourough it will take max 4 hours for two pcb's.

I think 4 months is sufficient to have a working unit. I'll hope I'll don't put too much pressure on you? I'll suspect that the other guys are anxious to start building.

 

[sek]

I'll suspect that the other guys are anxious to start building.

Well, that's not true for me.

I just cannot accept your beta-test conditions, as I already explained.
In case you don't want to think about it again (I already explained my points, as I said), my set of beta-boards is available again for someone else who is willing and wealthy enough to afford them!

Sorry,
Sebastian.

 

[BrianGT]

I just cannot accept your beta-test conditions, as I already explained.
In case you don't want to think about it again (I already explained my points, as I said), my set of beta-boards is available again for someone else who is willing and wealthy enough to afford them!

I am confused. What are the beta conditions? I didn't see them mentioned in this thread.

--
Brian