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Old 16th December 2011, 03:57 PM   #141
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C18,C73 not found on the circuit diagram but it have in the part list,it might be option

C18,C73: 100nF/100V MKS2 Wima
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Last edited by hien.t.nguyen; 16th December 2011 at 04:02 PM.
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Old 16th December 2011, 04:24 PM   #142
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Is C65, and C24 missing also?
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Old 16th December 2011, 04:34 PM   #143
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Quote:
Originally Posted by tommy1000 View Post
Is C65, and C24 missing also?
Well,sorry
C65,C73 is bypass capacitor for Vcc(power)

I am not found C18,C24 on schematic Metis3
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Old 16th December 2011, 04:43 PM   #144
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Thank you.
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Old 27th December 2011, 08:57 AM   #145
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Default The new vesion

The new vesion of the clone Goldmund Amplifier,today I re-layout with dual channel versions.
Original metis 3 circuit(#390.2)

All in one,dual chanel,very compact, using SMD components, ... compatible with heatsink have the length > 16cm(heasink in picture my layout is 19cm)

Appropriate for many types of chassis.

Happy New Year

Regards.
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Last edited by hien.t.nguyen; 27th December 2011 at 09:03 AM.
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Old 27th December 2011, 09:02 AM   #146
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Schematic used for this layout.
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File Type: gif sc1.GIF (23.7 KB, 854 views)
File Type: gif sc2.GIF (15.9 KB, 817 views)
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Old 27th December 2011, 09:38 AM   #147
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Very appealing PCB, it's just that I don't like this kind of output BJT assembly, it is self limiting and has good thermal spreading only in installation you've suggested. PSU part has only 3200uF per rail, this is not nearly sufficient for two pairs of outputs per channel. 32000uF sounds more adequate ...
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Old 27th December 2011, 09:52 AM   #148
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Quote:
Originally Posted by Lazy Cat View Post
Very appealing PCB, it's just that I don't like this kind of output BJT assembly, it is self limiting and has good thermal spreading only in installation you've suggested. PSU part has only 3200uF per rail, this is not nearly sufficient for two pairs of outputs per channel. 32000uF sounds more adequate ...
thank for your comments.

Hix,this is the original circuit

I've said in the topic"The Very Best Amplifier I Have Ever Heard!!!! "

Quote:
Have two ways to have great sound with Goldmund circuit(lateral mosfet output) is:

1. High current bias(200-300mA), with power supply enough clean (large capacitance>10.000uF or parallel multiple small capacitors),it raises more heat,heatsink must be large enough.Goldmund does not choose.

2. Low current bias(70-90mA), the power supply does not need too clean(for Power Amplifier stage - Output).Goldmund has chosen this option,so they just choose capacitors for the power supply is 2200uF +1000uF = 3300uF.Their heatsink is very small.
Because the small capacitance means is the impedance power supply will be greater,it raises many harmonic distortion on the load speakers, when considering the load resistor to announce the results, it is very low harmonic distortion but the reality is not so, the speaker is not the same as resistance.

Sounds great,to less expensive materials,structure machine not bulky,be durable by very low-temperature,little damage, very aesthetic,...
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Last edited by hien.t.nguyen; 27th December 2011 at 09:57 AM.
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Old 27th December 2011, 10:05 AM   #149
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OK, maybe appropriate SMPS would do much better than this but anyway I like the channel schematic, especially double input fet.

One day I'll do the amp involving this one or LS5912 from Linear Systems.

P.S. BTW 2200+1000=3200

Last edited by Lazy Cat; 27th December 2011 at 10:07 AM.
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Old 27th December 2011, 10:10 AM   #150
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Quote:
Originally Posted by Lazy Cat View Post
...

P.S. BTW 2200 + 1000=3200
Ok,maybe you're right
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