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Old 1st May 2006, 02:31 AM   #1
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Thumbs up Workable Lizi final

Here is the schematic in PDF.I'll post the pictures of her after I get myself a digital camera.

Power supply is fed with a 200VA EI for both channel and smoothing with only 4700uF per voltage rail.
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File Type: pdf lizi.pdf (16.5 KB, 296 views)
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Old 2nd May 2006, 02:32 AM   #2
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Complete schematic in JPEGs.

Click the image to open in full size.

Click the image to open in full size.
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Old 2nd May 2006, 03:31 AM   #3
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HI
I didn't finnish yet the Zenquito , these amp does look great , congratulation.
Did you compared with the Zenquito, how it sound .
Do these work with 2SK1058 & 2SJ162 power mosfets .
I have all the parts for the zenquito , I just purchased the transformers , I just need to mount together the heatsink for class A mode instal the boards and ready to fire up.
I will let you know how it work when it finnished .
I read good and bad thinks about the Zenquito so I'm not in a rush with it .
I would like to hear more details about your design when it burnt in.
Thanks for the info .
Regards
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Old 3rd May 2006, 02:23 AM   #4
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The first impression of Lizi was she got a lot of punches in the lower region,that really surprised me,maybe due to the 200VA transformer,and she does not have the usual harsh sound that associated with a normal BJT amplifier.

I never build the Zenquito,so cant do any comparission in term of sound.
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Old 4th May 2006, 05:23 AM   #5
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Hi,

Will the circuit works when substituting 2SK135/2SJ50 with IRFP240/9240?

Regards.
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Old 4th May 2006, 09:48 AM   #6
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Quote:
Originally posted by Ipanema
Hi,

Will the circuit works when substituting 2SK135/2SJ50 with IRFP240/9240?

Regards.

it will ,but with some resistor value changes
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Old 4th May 2006, 10:32 AM   #7
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NO IT WONT WORK!
It must have Vbe or Vgs multiplier for thermal tracking.
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Old 4th May 2006, 02:47 PM   #8
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Quote:
Originally posted by bogdan_borko
NO IT WONT WORK!
It must have Vbe or Vgs multiplier for thermal tracking.

yup;
you're right!
I just slipped mentally on another construction.....
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Old 4th May 2006, 03:20 PM   #9
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Hi Leolabs,

You amplifier looks very interesting! Thanks for sharing it with us. Please forgive the simple question. I am still trying to take in the schematic.

1) What is the purpose of the pots R15/R16/R17? Is it to null offset or to set bias?


Cheers!
Russ
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Old 4th May 2006, 03:33 PM   #10
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Thanks guys for interested in Lizi.I would like to point out a few good points of her:

-easy adjustment of quiescent currents of the input&driver stages,which related to the output DC offset value.
-output stage bias is indepent on the bias of the previous stages(much better than the "Zenquito",sorry Jean )
-wide working voltage range,just need a few recalculations.
-wide selection of components,especially the BJTs and the MOSFETs(but not the JFETS,as there are not much complementary audio JFETs available. )

The whole building process was quite smooth(really surprise me ).Adjust the both BJT quiescent currents equal to each other(around 10 mA) and adjust the output stage(around 100mA) and she started to sing.
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