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Old 8th April 2013, 12:55 PM   #211
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shaan,i want get one pair the peeceebee shaan vssa
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Old 8th April 2013, 01:13 PM   #212
bluevas is online now bluevas  Indonesia
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Shaan...i loved to have too
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Old 8th April 2013, 01:24 PM   #213
naf is offline naf  Indonesia
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Congrats Shaan!
Can't wait to see it ;-)
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Old 8th April 2013, 01:34 PM   #214
PMI is offline PMI  United States
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Quote:
Originally Posted by shaan View Post
The PeeCeeBee thread was opened to help the average diy-er adopt the symmetrical "current feedback" topology without introducing extra parameters like CCS, parallel caps, exotic (unavailable) parts etc. that aren't seen on simple "voltage feedback" amps, e.g. the P3A ...
No problem Shaan, all just all for fun here!

I shall remove all the extra stuff presently. Just got carried away after reshuffling the parts around the power resistors under the board... (chuckle).

I consider myself to be a bit below the average DIY skill level anyway, LOL.
Thanks for the wonderful thread!
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Old 8th April 2013, 02:44 PM   #215
gannaji is offline gannaji  India
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Quote:
Originally Posted by shaan View Post
I got my own too!

Today I got 2.25 dozen prints of the PeeCeeBee, based on the design in the first post. Looks pretty kool with the green mask on.

Populated one right away and it's singing, brilliantly. Offset 5mV without any manual setting.

26 more to go.

Pix will be uploaded soon.

shaan
Please can I request you for a pair?
gannaji
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Old 8th April 2013, 06:21 PM   #216
PauloPT is offline PauloPT  Portugal
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Shaan, we want PeeCeeBees! We want PeeCeeBees! Lots of PeeCeeBees!
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Paulo.
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Old 8th April 2013, 07:42 PM   #217
PMI is offline PMI  United States
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Same layout as above, with parallel capacitors, Miller compensation caps, and Zobel removed (to keep within the original intent of this thread).

For anyone else doing something similar, the component placement and track routing of this particular version in SPARK is pretty simple, either following the example provided above by Shaan, or with the power transistors mounted under the board, even using SPARK for the first time. If you already have Eagle, or other similar layout software, probably even easier...

Thanks to Shaan for starting this thread!
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File Type: gif VSSA1b1.gif (25.5 KB, 631 views)

Last edited by PMI; 8th April 2013 at 08:12 PM.
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Old 9th April 2013, 12:19 PM   #218
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Default My final versions

Fixed a critical error on the last layout presented, I had the input pair emitter connections swapped. I'm a little embarrassed that happened and somewhat surprised no one noticed. Also included a layout for the BC type input transistors. The pin-out of the BC's make a layout which is more straight forward. Since the BC547C/BC557C are higher gain than my 2SA/2SC that will likely end up the preferred layout, but I'm still going to give it a try with the Japanese transistors since I have them on hand. Sent out the image for a film to be made, so I'm hoping to be etching my boards this weekend.
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File Type: gif CBE_TO3_PCB.GIF (42.4 KB, 561 views)
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Old 9th April 2013, 12:51 PM   #219
naf is offline naf  Indonesia
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Jason.. luckily you have found the emitor error on sc/sa before etching... I found error when all part have been soldered and it took me 1 day to found it. when debugging I blew 2 pair vas and all 10ohm resistor . But the price is paid off it sing beautifully finally.
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Old 9th April 2013, 02:48 PM   #220
Jay is offline Jay  Indonesia
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Originally Posted by jkuetemann View Post
here's where my TO-3 version sits...
I don't like to think of the possibility the output shorted to +V or -V
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