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Am I getting this right?

post #1 of 11
6/8/10 at 11:11pm
Thread Starter 

http://glassjaraudio.com/category.sc?categoryId=2

 

4x Beta 22 boards, 1x Sigma 22, an enclosure, and an overabundance of time is all I need to make a fully functional balanced Beta 22?

I'm planning to build one in the summer with a friend and some more help after a few smaller projects.


Thanks.

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post #2 of 11
6/9/10 at 1:09am
Well it's a start, remember Jeffs kits only include the components necessary to populate the boards. You'll still need umbilicals, connectors, attenuator, jacks, binding posts, iec socket, wire, screws and nuts etc.
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post #3 of 11
6/9/10 at 3:02am

Transformer as well if Jeff doesn't provide one.

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post #4 of 11
6/9/10 at 4:25pm
Thread Starter 

Thank you two very much, you've both been very informative.

I suppose I'll ask glass jar audio what else is necessary.

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post #5 of 11
6/9/10 at 4:29pm

Why not start with amb's Beta22 site to see which parts are necessary, then look at the BOM that Jeff provides and see what's missing.

 

Basically, you'll need a chassis and all parts associated with the chassis (connectors, IEC, wire, input/output jacks, volume knob and attenuator).  If you're getting a transformer from Jeff, definitely go with at least 100VA if you want to use this with headphones, higher if you want to use it with speakers, but then there's also heat to consider.  In either case, read amb's site in full before deciding to take on this project.

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post #6 of 11
6/9/10 at 4:34pm
Thread Starter 
Quote:
Originally Posted by FallenAngel View Post

Why not start with amb's Beta22 site to see which parts are necessary, then look at the BOM that Jeff provides and see what's missing.

 

Basically, you'll need a chassis and all parts associated with the chassis (connectors, IEC, wire, input/output jacks, volume knob and attenuator).  If you're getting a transformer from Jeff, definitely go with at least 100VA if you want to use this with headphones, higher if you want to use it with speakers, but then there's also heat to consider.  In either case, read amb's site in full before deciding to take on this project.

 

BOM? (Could you tell me what that means?)

Also, where do I find the parts list for the kits on the site?

 

Finally, can the Beta 22 be easily configured to support 3.5mm inputs?

Thanks for all the questions, I haven't completed reading the Beta 22 page so sorry if I'm asking something stupid.
 

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post #7 of 11
6/9/10 at 4:39pm

Bill Of Materials.

 

www.amb.org/audio/beta22

 

Your questions worry me, the Beta22 is an expensive amp that to build and complex to put together, if something goes wrong, will you be able to diagnose and fix the problem?  I hope this isn't your first project, but it sounds like it may be.  Perhaps a "smaller" project to start with first?

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post #8 of 11
6/9/10 at 4:40pm
Quote:
Originally Posted by Vergex2 View Post



 

BOM? (Could you tell me what that means?)

Also, where do I find the parts list for the kits on the site?

 

Finally, can the Beta 22 be easily configured to support 3.5mm inputs?

Thanks for all the questions, I haven't completed reading the Beta 22 page so sorry if I'm asking something stupid.
 

BOM = Bill of Material

Not sure if Jeff has parts lists on his site, but he has always sent a spreadsheet with parts/options for the sigma22s I have bought from him. He probably has the same for the Beta 22.

You can put any inputs you want on it, but you will have to deal with the switching/wiring of these. Not sure why you would want to use 3.5mm for this as they suck. XLR would be the default balanced input, RCA default for single-ended input. You appear to want to build a balanced Beta 22 (4x); I would consider using 2x sigma22s for this. You could probably feed them with a single transformer if you wanted to.
 

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post #9 of 11
6/9/10 at 4:49pm
Thread Starter 
Quote:
Originally Posted by FallenAngel View Post

Bill Of Materials.

 

www.amb.org/audio/beta22

 

Your questions worry me, the Beta22 is an expensive amp that to build and complex to put together, if something goes wrong, will you be able to diagnose and fix the problem?  I hope this isn't your first project, but it sounds like it may be.  Perhaps a "smaller" project to start with first?


By then it wouldn't be my first project. While I do have very limited experience in electronics (to be fair, I can't understand how my teacher even got into university), I do plan to build a few smaller amplifiers (Cmoy, Mini^3) first and see how it goes. If it goes poorly, I suppose we'd abandon the project.

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post #10 of 11
6/9/10 at 5:42pm

I do have the BOMs for both the S22 and B22 from Jeff. Just let me know if you need them.

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post #11 of 11
6/9/10 at 6:09pm

I'd like to echo FallenAngel's comments - the B22 is quite a complex amp. There's a lot of building involved, it's very hard to troubleshoot if you don't have experience and a good knowledge of circuits, and there's a good chance something will go wrong. If you decide to do it having only built a Cmoy or Mini3, be prepared for the possibility of spending a lot of time and money troubleshooting it.

 

To be clear, I'm not trying to discourage you from doing it (the whole point of DIY is going out and trying new things), but I would build up some experience first if you want things to go smoothly.


Edited by Juaquin - 6/9/10 at 6:11pm
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