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Old 8th February 2013, 11:40 PM   #1431
Salas is offline Salas  Greece
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Quote:
Originally Posted by albina View Post
"A picture's worth a thousand words".

Ted
And a pricing quotation so we know its Euro worth too. Interested here.
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Old 9th February 2013, 01:52 AM   #1432
brianco is offline brianco  Ireland
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Yes please!

Thanks,

Brian
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Old 9th February 2013, 04:55 AM   #1433
sonnya is offline sonnya  Denmark
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Quote:
Originally Posted by Lazy Cat View Post
Hi Sonny

Could use it for VSSA. Can you show us CAD drawings?

Regards L.C.
Sure. It will only be a matter of hole placement on the heatsinks.

I will let my friend Bert make the drawings.
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Old 9th February 2013, 07:21 AM   #1434
vgeorge is offline vgeorge  Greece
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This is an excellent amplifier and deserves an excellent chassis!
Depending on the cost, very interested.
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Old 29th March 2013, 06:51 PM   #1435
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I hesitate to post this because I'm not sure if it's good or not. I've included three attachments. One of the Lazy Cat TSSA BJT circuit, second, of my pcb layout with component values and third, my pcb layout without component values. I layed out the pcb's in a program called DIYLayout Creator. I've been using it a lot for simple guitar stompboxes and small power amps. I know that I should just bite the bullet and learn Cadsoft Eagle. I was hoping someone could take a quick look and see where the glaring errors are or if I should just scrap the whole thing and use a better pcb editor. I've seen the layouts that Ales MM and a few other do here and there so good. (Beyond good). I just wanted to etch my own all bjt version of the TSSA and listen to it. You won't hurt my feelings if it stinks.
Tom
Attached Images
File Type: jpg TSSA BJT.jpg (377.6 KB, 918 views)
File Type: png TSSA BJT.png (100.8 KB, 875 views)
File Type: png TSSA BJT 2.png (67.3 KB, 831 views)
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Old 29th March 2013, 07:28 PM   #1436
tinitus is offline tinitus  Europe
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Quote:
Originally Posted by Lazy Cat View Post
Something like this, all BJT simplest.
P.S. 1mF FB bridge cap can be also beneficial.
Quote:
Originally Posted by sonnya View Post
No, it is not bad at all.

The same circuit could use njw0281/njw0302. With an higher idle in the input pair (10mA) and with good cooling it would be easy to do a class a amp with them also. Maybe even remove the collector resistors??!?!!!
to not forget it
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File Type: jpg SSA.jpg (166.3 KB, 833 views)
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Old 18th April 2013, 08:47 PM   #1437
sonnya is offline sonnya  Denmark
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Hi All.

I have made an powersupply design guide.

I know it is based on my modules but, I have added comment about fuse and wire dimensions.

I hope it is useful.

- Sonny
Attached Files
File Type: pdf Power supply building instructions for SITO Audio amplifiers.pdf (878.6 KB, 235 views)
File Type: pdf powersupply schematic.pdf (7.1 KB, 254 views)
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Old 2nd August 2013, 02:00 AM   #1438
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Quote:
Originally Posted by tom42107 View Post
I hesitate to post this because I'm not sure if it's good or not. I've included three attachments. One of the Lazy Cat TSSA BJT circuit, second, of my pcb layout with component values and third, my pcb layout without component values. I layed out the pcb's in a program called DIYLayout Creator. I've been using it a lot for simple guitar stompboxes and small power amps. I know that I should just bite the bullet and learn Cadsoft Eagle. I was hoping someone could take a quick look and see where the glaring errors are or if I should just scrap the whole thing and use a better pcb editor. I've seen the layouts that Ales MM and a few other do here and there so good. (Beyond good). I just wanted to etch my own all bjt version of the TSSA and listen to it. You won't hurt my feelings if it stinks.
Tom
Wow, your design quite simple and nice compare to mine. (although a bit spacious IMO) Mine got complicated because i use thermal track OP transistor, so wired backed is messy, thus until now haven't build the circuit, had you built yours ?

IMO, the input stage line is a bit long/far, thus prone to interference (unless sufficient shielding of input stage path)

Last edited by guitar89; 2nd August 2013 at 02:24 AM.
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Old 2nd August 2013, 02:32 AM   #1439
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And its quite unnecessary to make the supply line long (between +- and OP transistor) as it will produce supply noise to signal line. Make it short by placing immediately beside transistor and avoid near small signal path.

Tom,
there is also a missing capacitor in between input transistor (550/560)

Last edited by guitar89; 2nd August 2013 at 02:48 AM.
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Old 5th March 2014, 03:10 PM   #1440
Ripcord is offline Ripcord  United States
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I would like to build some small SS amps for learning and am putting together the TSSA BJT. I'm assuming the two 500 ohm trim pots are for adjusting bias. What would be the proper procedure?
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File Type: jpg TSSA BJT.jpg (381.0 KB, 249 views)
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