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Class D Switching Power Amplifiers and Power D/A conversion

PA Discrete Class D Amplifier Schematic
PA Discrete Class D Amplifier Schematic
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Old 2nd February 2016, 02:05 PM   #1
kartino is offline kartino  Indonesia
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Default PA Discrete Class D Amplifier Schematic

This is working schematic. A Discrete Class D with 2 sets of mosfet at 90Vdc supply will give you enough power to drive 18" speaker at pretty loud.

Don't ask layout
Don't commercialize
Try if you like, as it is. Don't try if you doubt it.

Ltspice file is attached.

Regards,
Kartino
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File Type: pdf DXT2K-UcD ver.3b - Final.pdf (97.4 KB, 694 views)

Last edited by kartino; 2nd February 2016 at 02:10 PM.
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Old 3rd February 2016, 01:26 PM   #2
kartino is offline kartino  Indonesia
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The amp. All general discrete part can be found everywhere
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File Type: jpg UcD2K Discrete.jpg (768.0 KB, 746 views)
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Old 3rd February 2016, 01:29 PM   #3
kartino is offline kartino  Indonesia
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Output ripple, showing well. As well as showing speed at about 300kHz, fine for PA Amplifier.
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Old 25th June 2019, 07:18 PM   #4
mbogdan is offline mbogdan  Romania
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Anyone know what schematic values need to be modified for a lower supply voltage. Say 2x40 - 2x50 volts.
I've built one of these, it doesn't work at these voltages.

So far, I've lowered R22 and R23 to about half value, but still i can't get it to work.
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Old 30th June 2019, 01:15 PM   #5
odnaizutra is offline odnaizutra  Guyana
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good work Kartino.
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Old 30th June 2019, 01:21 PM   #6
odnaizutra is offline odnaizutra  Guyana
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This kind of protection ,sometimes kicks in because of big decoupling cap value.
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Old 30th June 2019, 01:22 PM   #7
odnaizutra is offline odnaizutra  Guyana
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Did you had any trouble about this?
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Old 30th June 2019, 01:26 PM   #8
Mark Tillotson is offline Mark Tillotson
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Surprized the 555 wasn't discretized too!
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Old 30th June 2019, 02:06 PM   #9
ICG is offline ICG  Germany
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Quote:
Originally Posted by Mark Tillotson View Post
Surprized the 555 wasn't discretized too!


Discrete circuits got the advantage that you can repair them even after decades. The feedback after the output choke is a plus too. A more elaborate protection would be quite useful though for PA use.
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Old 30th June 2019, 06:26 PM   #10
Reactance is offline Reactance  South Africa
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Quote:
Originally Posted by Mark Tillotson View Post
Surprized the 555 wasn't discretized too!
Are you serious? Have you seen the cost of a low propagation delay, fully differential comparator over a 6 transistor discrete design.?
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