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Old 7th March 2005, 08:35 PM   #1
arex is offline arex  France
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Default nouvelle electronique

Hello everybody!

I found this diagram in the last issue of "Nouvelle Electronique". It is a simple class a amplifier, 10 watt output power, 10Hz to 100KHz. All resistors are 1/4watt. Nothing to tweak.

I am not sure on the wrightness of the diagram: R5=R6=18K???.
C2=220uF but C1 1000uF????. can anybody tell me, is this correct???.

Can I use a double power supply +- 12V by conecting C3 at 0 volt???.

And in general it is a useable/good diagram?

Thanks !
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Old 7th March 2005, 09:02 PM   #2
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Looks a bit like the JLH with a constant current source
on top.
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Old 7th March 2005, 09:11 PM   #3
arex is offline arex  France
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I made a mistake: T1 is a pnp transistor.
The correct schematics joined:
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Old 7th March 2005, 09:20 PM   #4
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Default Re: nouvelle electronique

Quote:
Originally posted by arex


I am not sure on the wrightness of the diagram: R5=R6=18K???.

Yes...correct! Is for the middle point at the output , to be at half the supply voltage.



Quote:
C2=220uF but C1 1000uF????. can anybody tell me, is this correct???.
C2 must be at least 2.200 uF for good low frequency response , with a 8 Ohm load.
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Old 7th March 2005, 09:25 PM   #5
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Quote:
I made a mistake: T1 is a pnp transistor.
T1 in your second schematic must be connected with emitter to C3 and T3 must be a PNP transistor.
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Old 7th March 2005, 09:29 PM   #6
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Quote:
Originally posted by arex
I made a mistake: T1 is a pnp transistor.
The correct schematics joined:

No, no, no
T1 was OK, T3 wasn't

cheers

edit: Jorge was first, ignore
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Old 7th March 2005, 09:36 PM   #7
arex is offline arex  France
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WRONG again! T3 is a pnp too.
Excusez moi svp. THIS IS THE WRIGHT DRAWING.

Can I use a dual power supply by conecting C3 on 0 volt and eliminating C2??

Comparing with the JLH amp: the resistor on the Q2 colector (JLH) in a 7watt one.

Here (nouvelle electronique) the same resistor in the T4 emiter is a 1W ( 0.25 x 4). Why?

Thanks
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Old 7th March 2005, 09:48 PM   #8
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Quote:
Originally posted by arex


Can I use a dual power supply by conecting C3 on 0 volt and eliminating C2??
No , because that way , the offset will not be controlled...



Quote:
Here (nouvelle electronique) the same resistor in the T4 emiter is a 1W ( 0.25 x 4). Why
Because in your schematic the dissipation in that resistor is ~ 0,6W..so 1W is enough .

Attention in your last schematic T1 is still up side down
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Old 7th March 2005, 10:18 PM   #9
moamps is offline moamps  Croatia
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And something is wrong with amp's grounding.(-Ve and C3 on same potential?)
Also, quiescent current is too small to reach 10W/8ohm.

Regards,
Milan
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Old 8th March 2005, 12:41 AM   #10
arex is offline arex  France
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No , because that way , the offset will not be controlled...

I will join another diagram, hope the wrigt.

Please excuse my ignorance, how must I modify the schematic to eliminate C1 ??
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