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Old 7th April 2009, 11:13 AM   #91
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Default Thank you.


now fixed.

regards,

Carlos
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Old 7th April 2009, 01:59 PM   #92
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Default Alex mm sent the silk screen image.


attached,

regards,

Carlos
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Old 7th April 2009, 02:17 PM   #93
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Hi Carlos,

I especially like the capacitor-coupled output with post-capacitor feedback.
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Old 7th April 2009, 02:27 PM   #94
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Default Ahahahha!... thank you.. i do love those strange things too


Be happy.

regards,

Carlos
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Old 7th April 2009, 02:34 PM   #95
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Andrew is the QC department. Thanks Andrew.

I'll fix the whole schematic and re-post it a bit later.

..Todd
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Old 7th April 2009, 03:39 PM   #96
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Default Build the Trust amplifier..the one that has a real working


Quality control department.

heheheh.

regards,

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Old 7th April 2009, 05:06 PM   #97
fjr is offline fjr
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Quote:
Originally posted by AndrewT
you've cut the wrong link.
the horizontal link between C24 & Q2 makes the schematic the same as original.

I would use a fast, low capacitance, high hFE, signal device for the VAS, even if this means increasing the value of the Miller comp cap.

BD139
ft ~50MHz
Cbe ~10pF
hFe ~100
+ easly available & cheap!

IMHO it's a perfect choice here.

Charlie!

Are you sure these 7.5pF and 680pF caps are needed? What's the reason using them?

Nice circuit anyway! Thanks for publishing!
Reminds me to the old HiFi/PA amps in the 70's. They used the same conventional circuit, but with old OP devices (quasi 2N3055).
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Old 7th April 2009, 07:21 PM   #98
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Default Capacitors prevents High Frequency oscilations.


those frequencies goes from 3 to 30 megahertz..and i found this amplifier addicted to those oscilations... i had while tweaking..reason why they are there....not only those capacitors helps, also zobel filter and the VAS miller capacitor.

I think they could be even bigger.... i tested till i have blocked those oscilations...not sure..maybe the Miller increase have stopped the oscilations and those folks are doing nothing....if doing nothing, at least not bothering me..if bothers you... do not use them dear friend.

If you want you can remove them... having oscilations, them insert them back again.

I love BD139...but you know..each one has own preferences.

This is a matter of taste...i like blonds.

regards,

Carlos

.................................................. .................................................. .....

The amplifier resulted good into measurements with those folks there..in place.
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Old 8th April 2009, 03:36 AM   #99
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Default DX Trust schematic v1.1

Latest schematic...
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Old 8th April 2009, 04:45 AM   #100
Sheldon is offline Sheldon  United States
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Hi Carlos,

Too many amps already. And building Roender's very sophisticated amp now. If I build anymore SS amps, it will probably be this one. Very simple, non-approved for audiophile use, no fancy parts. And I won't even bother close matching transistors (just best match from whatever is in the bin). Back to basics.

Sheldon
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