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Old 26th August 2012, 04:55 PM   #1
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Default my first ever discrete class d aud amp

made this with regular transistors and watever i got from my local suppliers.....based on philips UCD...output coil is behind the board not seen in pic....switching freq is 285khz
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Old 27th August 2012, 01:55 PM   #2
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Response is gr8...i tested it with /-40....output is 200watts....sound is too clear....powered it with small heatsink...only little heat....but bass is hard....good thing....for those who dont get the IR chips and required material at there place....and its very simple....and surely will work up at first time....dead time should be set as per the device used....
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Old 27th August 2012, 04:33 PM   #3
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I also made a discrete class D amplifier and is working fine, mine is only 12-15W powered from the same PC power supply that it is inside of.
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Old 28th August 2012, 07:28 PM   #4
stewin is offline stewin  Kenya
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Quote:
Originally Posted by sweetperfume View Post
made this with regular transistors and watever i got from my local suppliers.....based on philips UCD...output coil is behind the board not seen in pic....switching freq is 285khz
pls post the schematic
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Old 29th August 2012, 03:06 PM   #5
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pls post the schematic
The schema is same as philips no alteration in it.....it works good I used irf640b....get warm bit faster but i'm glad to hear it....there no complex terms like IR2110 amp....so I love this one...i'll also be trying IRS2092...i ordered a board from ebay...i'll be getting it by two days... .will update you what special it has
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Old 29th August 2012, 03:21 PM   #6
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Stewin can you tell me how will you connect 4 pairs of IRF250N to this amp....by adding an extra buffer or just putting resistor..
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Old 29th August 2012, 06:04 PM   #7
stewin is offline stewin  Kenya
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i plan to use totem pole like the below schema. i haven't managed to include overcurrent protect but it has dc , ac delay and overtemp protection.

Last edited by stewin; 29th August 2012 at 06:16 PM.
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Old 29th August 2012, 06:12 PM   #8
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Originally Posted by stewin View Post
i plan to use totem pole like the below schema. i haven't managed to include overcurrent protect but it has dc , ac delay and overtemp protection.
On philips said they said the amp switches at 400khz but when I tried to set it on that freq it showed short heating the fets...and why you need to set the freq at 250???
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Old 29th August 2012, 06:18 PM   #9
stewin is offline stewin  Kenya
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i even wanted to go slower in order to use irfp250/260n with +/-85vlts
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Old 29th August 2012, 06:25 PM   #10
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i even wanted to go slower in order to use irfp250/260n with /-85vlts
At what voltage this design could be used max with no issues of smoking it up??? And if I use 4 pairs of irf640 how much output can it give at \-60 volts??? ...and can this design be stable at 2ohms
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