Yet another version of IR audio amp ??

[kartino]

Okey, Thanks, I just saw a lot of class-D sub schematic at that era is similar like yours, but not for full range.

I saw also similar with parallel output fets for 1000W. Do 1600 series also use parallel fets?

Thanks to share with us.

Best regards,
kartino

 

[kartino]

Hi,

I know your 4060 make it simple.

Thanks

 

[fredos]

No the 1600 and 2000 use all N mosfet with discret drivers...600W per ch is the max safe power I can get with PN mosfet. I have try some parrallel arrangement, but switching time is too slow for parra device, so it was unusuable for full range amplifier. All my amplifier, from 1200W to 8000W use single pair of output. Only arrangement is different!

Thanks

Fred

www.d-amp.com

 

[tomi]

Hi fredos,
That looks like a pretty impressive amp - nice work. Unfortunately I can't open the schematic, what's the fomat (it's not an Eagle schematic)?
Is there a way you could make it available as a PDF or similar?

Cheers
Tom.

 

[zkaiser]

hi tomi

it is drawn by CirCAD software which you may download for free as a demo on: http://www.holophase.com/dlevalw.htm

it is around 5MB

Best regards
Zeljko Kaiser

 

[fredos]

By the way, It seem that is the only treads who talk about real power amp, not only the use of already build commercial amplifier...Why other guy who whant to ''make'' a class d amplifier use only prebuilt amplifier or kit??? That disapoint me that no much people try the real thing! Not the good way to improve something!

A bit sad...

Ferdos

 

[alfsch]

right frederic...
you could see my d-amp "work" at
www.sodfa.de.vu
look at : hot cheap-d mk1 , 100w max, p-n fets, cheap ucd-like.
and alfsch ucd-clone , 400w max, n-n fet, diskrete ucd, (not finished..)

just for fun...

alf

 

[fredos]

Hello alf


How to check your SCH? I dont understand deutch...

Look like I have to register, but...

Thanks

fredos

 

[alfsch]

no deusch

just try: download --> cheap-d
http://sodfa.so.ohost.de/include.ph...33&PHPKITSID=aeed16bad22e46639b4d06c2c1330b8d

anyway, ask me, and i will do my best to explain...

 

[edl]

right frederic...
you could see my d-amp "work" at
www.sodfa.de.vu
look at : hot cheap-d mk1 , 100w max, p-n fets, cheap ucd-like.
and alfsch ucd-clone , 400w max, n-n fet, diskrete ucd, (not finished..)

just for fun...

alf

Hi,

Excellent forum, thanks for the link!

Best regards,

 

[fredos]

Hello alfsch

I just take a look at your amplifier. Question, how is oscilate? No generator and feedback taked after the coil....I have try some experimentation with coupled capacitor, but no ''hold'' for gate drive at clipping, so that's why I have move to the direct drive version with zener diode...

Thanks

Fredos

www.d-amp.com

 

[alfsch]

well, its self-oscillating, like ucd, you use phase at -180° together with the delay to get 360° at ...the self-osc. frequ.
"hold" is bad, your right, but with 100nf + 56k gate-source it plays musik with some clip as it should (to much or long clip will add some crackling ..) and for normal-not-at-clip-drive , (hifi), this is no problem. (its not intended for pa-use

 

[fredos]

You can maybe clip the input with diode to avoid this...

Fredos

www.d-amp.com

PS chines copy my HVI serie....Again!

http://www.stunitedsupply.com/webboard/open_webboard.php?id=973

 

[tomi]

Thanks once again folks,
Equipt with a copy of CirCAD I'll off home and look at these designs.

If I ever get round to doing any amplifier work I'll let everyone know how it goes - however I've got other projects underway to finish first!

cheers
TOMi

 

[luka]

hey, Fredos

In the schematic of D-amp, there is not some values of elements:

-R25
-R26
-level
-c23
-c22

and can you tell me how is U5 connected,witch pin (number) goes where?

Thx

 

[edl]

Luka!

The current limiter section isn't in the schematic too! Without this stage the running of whole amp would be so risky.

About: r25, r26, c22, c23 Fredos wrote in the other thread, that he would like to keep these two part value in secret. You need to experiment to get the adequate values.
About level pot: you can easly find the goos value, I think it need to be a few 10kohms...

Best regards,

 

[luka]

hi

what is the main voltage? +/- 90?

 

[edl]

hi

what is the main voltage? +/- 90?

Yes

 

[Nejc_car]

Do you know in what range are the c22, c23 caps (mF,uF,nF)

 

[luka]

Hi, Edl

I thik i got the right values of r26 and c23. I believe the are 100k and 22p. The saw is 16Vp-p. Is that too much?

+/-90v? Isn't that a bit too much for ONLY 600w x2. I think -/+75 would be much better, because the main caps are only 80v.

And isn't there one more board for this amp ?