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Old 31st July 2011, 06:50 AM   #351
alex mm is offline alex mm  Europe
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Default .......and so on ....

..... D1 zenner diode must be reversed , R7=1k resistor in wrog position not to pin 4 IC (not this way )..... , output transistors are the same 2SC5200 ? and so on ........

Last edited by alex mm; 31st July 2011 at 06:52 AM.
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Old 31st July 2011, 08:34 AM   #352
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Default thanks for the correction

Quote:
Originally Posted by alex mm View Post
..... D1 zenner diode must be reversed , R7=1k resistor in wrog position not to pin 4 IC (not this way )..... , output transistors are the same 2SC5200 ? and so on ........
hope this is fine...
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Old 31st July 2011, 09:25 AM   #353
alex mm is offline alex mm  Europe
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Default ....not OK

....... forget to link , like in pic .
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Old 31st July 2011, 12:11 PM   #354
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Default again, again...

Quote:
Originally Posted by alex mm View Post
....... forget to link , like in pic .
thanks,alex...your the man!

and also change the schematic
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Last edited by drowranger; 31st July 2011 at 12:17 PM.
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Old 31st July 2011, 12:18 PM   #355
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Default scematic

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Originally Posted by drowranger View Post
thanks,alex...your the man!

and also change the schematic
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Old 4th August 2011, 09:42 AM   #356
AndrewT is offline AndrewT  Scotland
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IC1 PIN3 ?
If the unconnected PIN3 floats with PIN2 then the 411 output voltage will always be zerovolts +-output offset +-common mode error.
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Last edited by AndrewT; 4th August 2011 at 09:56 AM.
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Old 4th August 2011, 09:55 AM   #357
AndrewT is offline AndrewT  Scotland
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It is connected to two diodes. Both are connected to PIN2.
As drawn PIN3 floats with PIN2.
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Old 4th August 2011, 09:55 AM   #358
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Default you are right

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IC1 PIN3 ?
If the unconnected PIN3 floats with PIN2 then the 411 output voltage will always be zerovolts +-output offset.
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Old 6th August 2011, 05:06 AM   #359
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Default hope its ok now...


thanks andrew for checking.
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Old 6th August 2011, 10:51 AM   #360
AndrewT is offline AndrewT  Scotland
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You have connected PIN3 to Signal Ground.
Label Signal Ground to differentiate it from Power Ground.
Now a question which ground does R21 connect to?

Show the change on the sch.
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