My new design

audio-gd · 20th December 2004, 03:29 PM

It's complete no feed back . It have some new ameliorate . The old type I had build more , tomorrow I'll build this.

audio-gd · 20th December 2004, 03:34 PM

It have protect circuit .But the power supply is another board.

anli · 20th December 2004, 05:17 PM

Quote:

Originally posted by audio-gd
It's complete no feed back . It have some new ameliorate . The old type I had build more , tomorrow I'll build this.

I have not see many schematics with such clean design!

- will you share your sonic impressions with us?
- also, FFT diagram may be interesting (in particular, harmonics lowering speed),
- what is done for thermal stability?
- what PS voltage and bjt models do you use?

Thanks!

darkfenriz · 21st December 2004, 08:36 AM

don't you think that a cap parallel to diodes in DCservo is redundant? and may couse troubles? i would use a resistor in there.

peranders · 21st December 2004, 08:47 AM

This cap is a major part in the servo, can't be removed. This input filter make sure the gain is constantly dropping instead of landing at 1, because this is an non-inverting integrator.

Jennice · 21st December 2004, 08:59 AM

I would be concerned about thermal runaway (thermal bias compensation), but other than that, it's interesting.

Jennice

Drasius · 21st December 2004, 01:56 PM

I have made the amplifier, with output stage wich you can see, 4 years ago. It sounds very good.

audio-gd · 21st December 2004, 01:59 PM

About POST #4 said the cap, I'm very agree POST #5 said, this cap with the resistance organize a filter, the filter touch the sound,
Today, i've complete the board and tset it .

Jennice · 21st December 2004, 03:16 PM

audio-gd,

Nice amplifier units! Looks proff., nice and tidy.

A lot of power devices for this kind of heat sinks, though,.. I think.
My thought is that it's over-kill (but then again, isn't that what DIY is all about?) with the power transistor's power handling capabilities, compared to the heat sink's size.

Jennice

audio-gd · 21st December 2004, 04:07 PM

This cooler weight about 2KG, and I'll put it on the amplifier both sides ,then it can cool faster. I think it can deal the family use.
But this is a cheapness edition to my Hi-END amplifer XA-100. In XA-100, the cooler is weight about 10KG, and the circuitry is quite complex .
But the cheapness edition can use simple circuitry and keep the sound good. It's circutry I'd ameliorate time after time .
Send the XA-100 picture under.

21st December 2004, 08:59 AM	#6
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	I would be concerned about thermal runaway (thermal bias compensation), but other than that, it's interesting. Jennice __________________ I get paid to break stuff. My g/f gets paid to play with children. Life is good.

21st December 2004, 03:16 PM	#9
Jennice diyAudio Member Join Date: Jun 2003 Location: Planet Earth	audio-gd, Nice amplifier units! Looks proff., nice and tidy. A lot of power devices for this kind of heat sinks, though,.. I think. My thought is that it's over-kill (but then again, isn't that what DIY is all about?) with the power transistor's power handling capabilities, compared to the heat sink's size. Jennice __________________ I get paid to break stuff. My g/f gets paid to play with children. Life is good.

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21st December 2004, 08:36 AM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	don't you think that a cap parallel to diodes in DCservo is redundant? and may couse troubles? i would use a resistor in there.

21st December 2004, 08:47 AM	#5
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	This cap is a major part in the servo, can't be removed. This input filter make sure the gain is constantly dropping instead of landing at 1, because this is an non-inverting integrator. __________________ /Per-Anders (my first name) or P-A as my friends call me

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