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Class D Switching Power Amplifiers and Power D/A conversion

SystemD LiteAmp
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Old 28th December 2017, 07:49 PM   #741
Reactance is offline Reactance  South Africa
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Join Date: Jun 2005
Location: Cape Town
I've made a small video showing how well the amplifier drives the sub-woofer.

There’s nothing worse than the smell of burned output transistors!!
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Old 1st February 2018, 05:23 AM   #742
JLesterP is online now JLesterP  Philippines
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Join Date: Sep 2010
Location: Quezon City
I updated freebie gerber for liteamp.

Compatible inductors:
AGP2923 / VER2923
T157-2 (vertical mount DIY)

Can use IPP120N20NFD

Chassis mount resistor for zobel

Heatsink mounting should look like the one attached (see prototype)

Attached schem (just don't mind the component values)

If anyone wants the gerber, please message me
Attached Images
File Type: jpg LiteAMp.JPG (109.6 KB, 246 views)
File Type: jpg s-l1600.jpg (232.1 KB, 245 views)
Attached Files
File Type: pdf LiteAmp JLE Schematic.pdf (33.9 KB, 74 views)
amplifier PCBs and modules
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Old 1st February 2018, 08:21 PM   #743
ChocoHolic is offline ChocoHolic  Germany
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Join Date: Dec 2003
Location: Munich
Very nice to see your builds and new variations !

looks like was nice this Xmas and brought a decent scope..
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Old 6th February 2018, 06:28 PM   #744
fushfush is offline fushfush
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Join Date: Jul 2015
Location: Denmark
Hi guys,

I'm about to quit this project.
I got 3 boards, SMD and trough-components are soldered on, they just need to be tested according to Choco's guide and then the last parts can be soldered on. I got all parts for them to be completed
I got a 300VA 2x28VAC toroid for each board with capacitors, and resistors. I planned to make a CRCC PSU with a bleeder resistor.

PM me anyone if any of you are interested to buy it..
I can reply with the orders from Digikey and Reichardt, so you can see what you get :-)

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Old 13th February 2018, 10:05 AM   #745
zoky2 is offline zoky2  Slovenia
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Join Date: Nov 2013
First board tested with +-70V DC power supply, sound is very good ,no hum or noise .3 more boards ready for testing with higher supply,for now they were tested only with +-40Vdc.
Not the easiest amp to assembly but it is worth to try.
Thanks ChocoHolic for sharing your amp .

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File Type: jpg LiteAmp.jpg (915.8 KB, 155 views)
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Old 14th February 2018, 08:21 PM   #746
ChocoHolic is offline ChocoHolic  Germany
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Join Date: Dec 2003
Location: Munich
It always makes me happy to see new builds. My congratulation.

================================================== ==
One general remark. From theory it is not mandatory:
But after touching Q1 of my 2x80V version, my bio sensor convinced
me to put a small heat sink for Q1 as well.
Note: You must not touch it anyhow, because of dangerous voltage!

The gap between theory and bio sensor feedback is clear:
Bio sensors send alarm above 65 C, while such BJTs can easily run reliably for long term above 100C. Likely the heat sink for Q1 is just cosmetic, but I felt better after putting it.

Last edited by ChocoHolic; 14th February 2018 at 08:25 PM. Reason: Edit: Added the note about dangerous voltages.
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