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Simple Symetrical Amplifier
Simple Symetrical Amplifier
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Old 24th September 2011, 10:59 AM   #881
Lazy Cat is offline Lazy Cat  Slovenia
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Originally Posted by Josip_Del View Post
The voltage on Vbe multiplier does not change when turning trimmer correction they are 0,3V/0,35V/0,35V
You don't have input collector current. Now it is zero but it should be 4,5mA. Recheck complete input stage, all four input transistors and zener diodes orientation.
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Old 24th September 2011, 11:13 AM   #882
FdW is offline FdW  Netherlands
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Simple Symetrical Amplifier
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Originally Posted by Lazy Cat View Post
That won't help at all.
Still, the bias could not be set (in the simulator), and after changing these resistors it could. For as far as I can see, these resistors are parallel to the bias regulator, if the voltage does not rise to the required level (over the bias regulator) I figured that raising the value of these resistors might help (and it did, in the simulator). Probably due to the 10ohm emitter resistors? If I am wrong then please explain why, so I can understand your design better.

Regards,
Frans.

Last edited by FdW; 24th September 2011 at 11:15 AM.
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Old 24th September 2011, 11:19 AM   #883
Lazy Cat is offline Lazy Cat  Slovenia
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Originally Posted by FdW View Post
If I am wrong then please explain why, so I can understand your design better.

Regards,
Frans.
Look at here.
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Old 24th September 2011, 11:26 AM   #884
Josip_Del is offline Josip_Del  Dubai
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Here is the voltages on the input transistors, but I am no shure are they in written order
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Old 24th September 2011, 11:34 AM   #885
Lazy Cat is offline Lazy Cat  Slovenia
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Originally Posted by Josip_Del View Post
Here is the voltages on the input transistors, but I am no shure are they in written order
As I said, you don't have +/-15 V on zeners referenced to GND. On cathode ZD1 there should be +15V, on anode ZD2 there should be -15V referenced to GND potential. There is your must starting point if these two aren't correct, forget all the other voltage readings.
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Old 24th September 2011, 11:37 AM   #886
FdW is offline FdW  Netherlands
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Originally Posted by Lazy Cat View Post
Look at here.
Thank's, back to the simulator
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Old 24th September 2011, 11:42 AM   #887
Josip_Del is offline Josip_Del  Dubai
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Originally Posted by Lazy Cat View Post
As I said, you don't have +/-15 V on zeners referenced to GND. On cathode ZD1 there should be +15V, on anode ZD2 there should be -15V referenced to GND potential. There is your must starting point if these two aren't correct, forget all the other voltage readings.
It is not 15V rather measured 14,7V?
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Old 24th September 2011, 12:27 PM   #888
Lazy Cat is offline Lazy Cat  Slovenia
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Originally Posted by Josip_Del View Post
It is not 15V rather measured 14,7V?
Look Josip, zener diode is not a voltage reference, its voltage potential is also zener current/production dependent, so across zener diode you should measure something from 14,5V to 15,5V (15V+/-0,5V).

But until you won't have both zener diode potentials correct, it is no use to measure other points potentials as well.

P.S. This is completely basic electronic knowledge, so I am afraid that you will have to look to some books or wikipedia too.

Last edited by Lazy Cat; 24th September 2011 at 12:31 PM.
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Old 24th September 2011, 12:30 PM   #889
Josip_Del is offline Josip_Del  Dubai
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I am confused know I have 14,7 to 14,5 V drop on zeners
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Old 24th September 2011, 12:59 PM   #890
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Originally Posted by Josip_Del View Post
I am confused know I have 14,7 to 14,5 V drop on zeners
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