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Old 14th February 2011, 01:43 AM   #21
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Quote:
Originally Posted by apexaudio View Post
Feedback is only for DC servo on this amp.
Thats a smart move as the DC can move around a bit until the amp warms up.
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Old 14th February 2011, 07:31 PM   #22
Eva is offline Eva  Spain
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Quote:
Originally Posted by nigelwright7557 View Post
I did a similar project using a TL082 triangle wave generator, LM319 comparator, XOR gates phass splitter and IR2113 mosfet driver.
I didnt use any feedback at all yet it sounded great.

The only minor problem I found was I needed to null the DC offset using a pot or i got low level hum. Must have been an inaccuracy somewhere in the line.
If you don't use any feedback, PSRR becomes 0dB. Ripple from supply rails appears directly at the ouput.
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Old 24th April 2011, 12:21 PM   #23
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Originally Posted by apexaudio View Post
This JBL class D amp for subwoofer can be made without SMD parts.
have you try this amps?
what is the supply voltage?
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Old 26th April 2011, 09:57 AM   #24
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Originally Posted by QQ12e5k1 View Post
have you try this amps?
what is the supply voltage?
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No, but JBL any many other brands use this class D module in active subwoofers...,
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Old 11th November 2011, 10:15 AM   #25
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Triangle Oscilator with NE555, out can be connect to pin 5 of LM393.
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File Type: jpg NE555 Triangle Oscilator.jpg (71.5 KB, 2521 views)

Last edited by apexaudio; 11th November 2011 at 10:22 AM.
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Old 11th November 2011, 03:05 PM   #26
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Quote:
Originally Posted by Eva View Post
If you don't use any feedback, PSRR becomes 0dB. Ripple from supply rails appears directly at the ouput.
Perhaps the regulated power supply of the Linn power amp model "Klout" is helpful (have a look to the attachement).
Quote:
Originally Posted by Eva View Post
LM566 VCO seems unobtainable.
here a German supplier:
SE566H A15/2475 - SH-Halbleiter Electronic Vertrieb GmbH
According the internal - not too complicated circuit - go to the datasheets about
http://www.datasheetcatalog.org/data...6/53609_DS.pdf
and
NE566N datasheet pdf datenblatt - NXP Semiconductors - Function generator ::: ALLDATASHEET :::
it must be easy possible to create the wanted functions with discrete decices.
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File Type: pdf C_tmp_Linn Kloud_ckt.pdf (55.4 KB, 682 views)
File Type: pdf C_Linn_Kloud control_ckt.pdf (13.9 KB, 349 views)
File Type: pdf C_Linn Kloud_control_ckt.pdf (15.4 KB, 263 views)
File Type: pdf C_Linn Kloud control_ckt.pdf (48.3 KB, 353 views)

Last edited by tiefbassuebertr; 11th November 2011 at 03:12 PM.
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Old 11th November 2011, 07:14 PM   #27
RaiTulo is online now RaiTulo  Finland
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Quote:
Originally Posted by tiefbassuebertr View Post
Perhaps the regulated power supply of the Linn power amp model "Klout" is helpful (have a look to the attachement).

here a German supplier:
SE566H A15/2475 - SH-Halbleiter Electronic Vertrieb GmbH
According the internal - not too complicated circuit - go to the datasheets about
http://www.datasheetcatalog.org/data...6/53609_DS.pdf
and
NE566N datasheet pdf datenblatt - NXP Semiconductors - Function generator ::: ALLDATASHEET :::
it must be easy possible to create the wanted functions with discrete decices.
Or ICL8038 ICL8038

Detailed Schematic page 4
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Old 13th November 2011, 05:00 PM   #28
baga is offline baga  Romania
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I dont't understand why someone will make a 25w discrete class d amplifier, apart from learning. There are many integrated circuits with better performance.
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Old 13th November 2011, 06:15 PM   #29
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Originally Posted by baga View Post
I dont't understand why someone will make a 25w discrete class d amplifier, apart from learning. There are many integrated circuits with better performance.
I understand this. The reason is the unknown time of availability. Most Class-D IC's in currently day's are obsolete and no longer available after very few years.
Otherwise brands like B&O (ICEPOWER), Hypex (UCD) and several others
would prefer monolithic IC's instead discrete solutions.
An second reason could be the possibility of detail improvements while the current production.

Last edited by tiefbassuebertr; 13th November 2011 at 06:19 PM.
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Old 14th November 2011, 09:21 AM   #30
baga is offline baga  Romania
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Icepower and Hypex make discrete amplifiers because they want to achieve higher power and lower distortions than those of the integrated circuits. And they don't make with lm393 and irf530
This schematic have low power and high distortions because of that parts, feedback topology and bad pcb layout. It has poorer performance than most integrated circuits. And is more difficult to make Only drawbacks, for what?
You are right about that some integrated circuits get obsolete, but we talk there from the point of view of a diyer. If some integrated circuit will get obsolete, we can simply pick another ic for our amplifier project. We don't have to modify our production line.
JBL and others use something like that in some products because were designed many years back. In those years that was the level of class d and they didn't have many integrated circuits.In 2011 , this schematic is a shame for class d.
Anyway, if you want to make a discrete amp,is better to make something like um10155 or with irs2092. For those you find a good pcb layout in the application notes. Theese have low distortions and can be scaled for higher power. You will get way better performance than this junk.

Last edited by baga; 14th November 2011 at 09:43 AM.
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