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Old 5th February 2006, 03:05 PM   #1
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Talking First Design

Could someone please check my component placement for my first design attempt... I don't have the values filled in yet, or the input section, just wanted to see if my placement and topo for the VAS and driver stages are OK. Any feedback is greatly appreciated.

Hawk
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Old 5th February 2006, 03:06 PM   #2
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Default OOPs

Forgot the schem!!!
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File Type: pdf api-100schem.pdf (20.9 KB, 227 views)
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Old 5th February 2006, 03:26 PM   #3
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Nice looking schematic you have done!
Easy to read and good quality picture.
Very nice!


I am afraid circuit looks too complicated.
I do not think it will work and I do not understand your circuit.
I can see a VBE multiplier and an output stage.
I guess you will use an input stage to drive this.


Start with draw a very simple circuit of your idea.
Then you can add the more advanced stuff later.
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Old 5th February 2006, 03:42 PM   #4
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Default Simplify...

Thaks, i'll yank some stuff and simplify it a bit...
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Old 11th February 2006, 09:07 PM   #5
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Although I don't understand the schematic fully too, I am not sure you should simplify it ...

Could you post a kind of explanation or clarify the schematic - put an input (at least) ... I may sound stupid but this schematic seems to me something like classAA or something ... I thing that Q7 and Q4 work in classA to provide less distortion while Q1 Q2 Q6 Q8 turn on/off. But I am not sure of anything without seeing the component values and the input ...

Wow ... this project gives me some ideas ... thanks and good luck ... send some explanation and I will try to be more helpful to you.
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Old 11th February 2006, 09:43 PM   #6
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r10-13 don't i,prove damping factor...
what are they for?
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Old 12th February 2006, 12:22 AM   #7
bob123 is offline bob123  United Kingdom
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i dont quite understand what you are trying to do. It is very complicated for a first desgn.
May i suggest that you start with a circuit that includes-

a joint tail pair as the input, current mirrors and sources will increse the gain quite substanualy.

a simple bias system for a push pull output stage.

negative feed back.

Rather than that complicated circuit that noone understands, i for one cant figure out where the input is!

Good luck
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Old 12th February 2006, 10:20 AM   #8
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I think that the schematic is interesting and I find that the only fact that we don't understand it is not a reason to give it up . hawkfeather, send an explanation, please. At least show where the input is ...
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Old 12th February 2006, 03:35 PM   #9
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I have included an input location on the schem. revision. Resistors R12-R13 and diodes D7 and D8 are part of the voltage feedback/sense loop. I have to get ready for work, but I plan on trying to complete the design this evening when I get home. Thanks for all the feedback.
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Old 12th February 2006, 03:37 PM   #10
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Default Scematic Revision

Sorry!
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File Type: pdf api-100schemb.pdf (21.2 KB, 72 views)
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