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Class D Switching Power Amplifiers and Power D/A conversion

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Old 7th December 2006, 08:44 PM   #11
v-bro is offline v-bro  Netherlands
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How good are these, if they're like UCD they should be well usable for full range. What class D amps are only good enough for subwoofers? Or is that bull....

The designs look very nice and simple, where do you start with something like this.....

Good work man! Keep it up!
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Old 7th December 2006, 09:52 PM   #12
Baldin is offline Baldin  Denmark
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classd_fromru
Seems that the main difference between 1.2 and 2.2 is the over current circuit ... is that correct? (could be layout as well)

Have you had any problems in using single layer PCBs?

Have you had any difficulties in getting it to start oscillating? or start up at all (getting the upper driver to function)?

I'm working on a circuit using the same kind of drivers, but I can't really get it to work
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Old 8th December 2006, 08:59 AM   #13
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Baldin,
In version 2 protection and a delay on start of is added. The oscillating is started in 1 second after the supply voltage is on. In version 2 oscillating is started always from the first even without a signal on an input.
At short circuit on an output, the comparator is set off and in 1 second is started again.
On single-side pcb all works very well. Soon I am going to order 2-side pcb.

v-bro,
Yes UcD sound is great in full-range! I think for the subwoofers UcD is best too.
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Old 8th December 2006, 10:18 AM   #14
RX5 is offline RX5  Philippines
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classd_fromru,


Hello.... im very much interested with the smps.... anyway you could translate them in english??

also , can that circuit be upgraded to a HIGHER current (like 4A) @ +/-45VDC???

btw, what software you use for layout? (*.lay extension)


Cheers,
raff
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Old 8th December 2006, 11:25 AM   #15
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Default smps

Hi RX5,

I recommend for high power (above 300-400w) use the most complex Smps with soft start and protection. But I know, that some people used IR2153 with above 500W amps

Now I use simply software for PCB design: Sprint Layout 4, but I wont soon using most professional software such as Diptrace or P-Cad.

English version of my site:

http://google.com/translate?u=http:/...om&langpair=ru|en&hl=en&ie=UTF8

Learn Russian language
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Old 8th December 2006, 12:48 PM   #16
alfsch is offline alfsch  Germany
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nice amps :-)

for pcb : try kicad , its free and easy to understand !
http://www.lis.inpg.fr/realise_au_lis/kicad/
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Old 12th December 2006, 10:01 PM   #17
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Cool my new UcD module

Hi all!

My new mini 20w version of UcD module
Click the image to open in full size.
Circuit here:
http://www.classd.fromru.com/circuits.html
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Old 12th December 2006, 10:18 PM   #18
RX5 is offline RX5  Philippines
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very cool


lower voltage supply + smaller(size) mosfet/s

nice that you dont have problems acessing SMT components...
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Old 13th December 2006, 08:34 AM   #19
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RX5,
Thanks
The pcb has turned out very beautiful.
Because a supply voltage is low, stabilizers for opamp and drivers are not become necessary.
I like to use SMD components because that it is not necessary to drill apertures . And the cost price turns out noticeably below.
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Old 13th December 2006, 09:07 AM   #20
RX5 is offline RX5  Philippines
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Hello,

uhmm I could have done so myself,. if it (SMT) where locally available... where do you source your parts? by mail or is it locally available?

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