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Old 15th August 2012, 08:28 PM   #1
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Default Fun with a TL494

I decided to after 8.5 weeks of inactivity dust off my breadboard and do something.

After a while of pushing components into the holes, this was the result: TL494 class d playing some music - YouTube
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Old 16th August 2012, 07:56 AM   #2
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Good job! Can you tell us what schematic have you used please :P
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Old 17th August 2012, 03:08 PM   #3
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I did not build this off of any schematics, i just wired up the error amps like regular single supply opamps, added a 5nF capacitor and a around 2k resistor for the oscillator part.

The output just goes to a simple N and P channel totem pole with IRF540 and IRF9540.
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Old 17th August 2012, 03:10 PM   #4
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Neat... what is the Fs?
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Old 17th August 2012, 03:10 PM   #5
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TEKKO can u please reply me in post of "ucd from 2 mosfets 1200 watts"
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Old 17th August 2012, 03:26 PM   #6
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Considering all the stray capacitance in the breadboard, likely 30-50kHz, cant be bothered hooking up a scope to measure.
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Old 17th August 2012, 06:17 PM   #7
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I beefed up the power stage alittle:
Old Ajax Tocco gate driver board sings - YouTube
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Old 18th August 2012, 01:39 PM   #8
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I've replaced the TL494 with a LM311 because the TL494 is pulse width limited, and it ran very hot.

This is the circuit of my new amp, currently playing, The oscillation frequency is around 800-900kHz. Simple, aint it ? Maybe too simple ?
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Old 18th August 2012, 02:06 PM   #9
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Interesting !!

jer
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Old 18th August 2012, 02:47 PM   #10
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A video: Self oscillating class D - YouTube
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