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Old 15th October 2012, 06:52 AM   #3431
naf is offline naf  Indonesia
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Hi naf.

The only problem I think is when one doesn't know the pin alignments of the TO126 package, which happened in your case too. That is why I pointed the "E C B" to each of them. Knowing the pins of the BJTs is a basic requirement and I think if one places the transistors following the E C B as situated in the silkscreen then all will be well.

The rectangular symbol is for TO220 not TO126 coz my stupid PCB software don't have it. The picture is just to show what the final think will look like. I will remove the rectangles in the final version(which I am going to build myself too).
Thanks you, Shaan
does this servo version have been tested and Ok?
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Old 15th October 2012, 07:20 AM   #3432
shaan is offline shaan  India
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So far okay in sim only. I am currently soldering the IC and the others parts and will connect them hanging over my SSA. I am going to order a bunch of the servo peeceebee within a week or two.
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Old 15th October 2012, 07:25 AM   #3433
naf is offline naf  Indonesia
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So far okay in sim only. I am currently soldering the IC and the others parts and will connect them hanging over my SSA. I am going to order a bunch of the servo peeceebee within a week or two.
I'm waiting your result... and preparing my iron .
Glad to hear that you will order a bunch of the servo peeceebe
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Old 15th October 2012, 08:10 AM   #3434
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Quote:
Originally Posted by shaan View Post
Hi naf.

The only problem I think is when one doesn't know the pin alignments of the TO126 package, which happened in your case too. That is why I pointed the "E C B" to each of them. Knowing the pins of the BJTs is a basic requirement and I think if one places the transistors following the E C B as situated in the silkscreen then all will be well.

The rectangular symbol is for TO220 not TO126 coz my stupid PCB software don't have it. The picture is just to show what the final think will look like. I will remove the rectangles in the final version(which I am going to build myself too).
hai shaan howare today....very nice your layout ssa pcb
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Old 15th October 2012, 08:19 AM   #3435
shaan is offline shaan  India
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Default Everybody knows that it would work...

Quote:
Originally Posted by naf View Post
I'm waiting your result...
Test done. Offset +/-2mV. Opamp fed directly from Zeners(I know this is not good, that's why there will be cap-multipliers in the servo peeceebee ).

Cheers!

shaan

p.s.- my veroboard SSA has become super ugly. Sorry for the bad looks!

edit:- 1. no sonic/bias change, 2. the pots are disconnected from the inputs.
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Old 15th October 2012, 03:42 PM   #3436
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Originally Posted by shaan View Post
Please comment...
May-be it would be carefull to short circuit the unused outout OpAmp with its - input and + input to ground ?
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Old 15th October 2012, 06:47 PM   #3437
shaan is offline shaan  India
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Hi Christophe.

Yes I can do it.

Would you please explain the advantage? I don't know what bad would happen if the unused channel is left floating?

Thanks.
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Old 15th October 2012, 08:15 PM   #3438
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Hi Christophe.
Yes I can do it.
Would you please explain the advantage? I don't know what bad would happen if the unused channel is left floating?
With no feedback, the OP Amp has terrific full gain (noise) and can oscillate With negative effects, both by capacitive coupling with the other one and its power supply rails. Just plug your oscillo to the unused output pin as it is...
.Did-you imagine to let your power amp with no feedback ? It is the same.
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Old 15th October 2012, 09:27 PM   #3439
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This is my plan. Please comment...
Hi Shaan,

Can you please point to the schematic corresponding to your last art work?

BTW, very nice layout.

Tony
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Old 15th October 2012, 11:54 PM   #3440
shaan is offline shaan  India
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Quote:
Originally Posted by Esperado View Post
With no feedback, the OP Amp has terrific full gain (noise) and can oscillate With negative effects, both by capacitive coupling with the other one and its power supply rails. Just plug your oscillo to the unused output pin as it is...
.Did-you imagine to let your power amp with no feedback ? It is the same.


Thanks a TON for the explanation!

Unused inputs shorted to ground.

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