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Old 20th April 2008, 10:25 PM   #1
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Default MHz amplifier

I was a little bit bored today so i started playing with a LM311P and a TC4422, this was the outcome after a few hours of playing around:

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Video.
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Old 21st April 2008, 01:37 AM   #2
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Nice lookin'!
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Old 21st April 2008, 04:24 PM   #3
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Nice
Everything stays cool? At what rail voltage?
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Old 21st April 2008, 04:54 PM   #4
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do you drive output inductor directly from mosfet driver?
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Old 21st April 2008, 05:58 PM   #5
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Yes. The thing get warm to the touch, rail volts is 15v regulated.

I settled for 1.52MHz since it got hot above 2MHz.
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Old 22nd April 2008, 04:55 PM   #6
fumac is offline fumac  China
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good job tekko

the voltage is a bit lower. 15v
but you can run it at 2mhz is cool.
tell us how about the sound at mhz

fumac
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Old 22nd April 2008, 05:39 PM   #7
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The amp sound reather good, i donīt have a speaker that would make the actual sound justice, so i need to get RMAA and install a M-Audio Audiophile USB soundcard on the laptop to get a line in, since the laptop soundcard doesent have one.

I also need to find my T106-2 cores to replace this crappy -26 material one.
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Old 23rd April 2008, 05:44 PM   #8
NeoY2k is offline NeoY2k  France
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Great job, I'm really interested in these Mhz design as they really look simpler than hypex ones.

But what about performances? It's hard to find information about this technology.
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Old 23rd April 2008, 10:40 PM   #9
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My amp is ****, i tried to measure it but IMD + Noise peaked @ over 24000%, however thd was only 0.06%.

The imd problem could be due to that the amp generates a tone on low freqs, yet im not sure if it comes from the preamp or the poweramp, or if its due to that i dont have af error feedback yet.
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Old 26th April 2008, 09:00 PM   #10
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The measurement errors turned out to be an unknown mic boost on the line input, the beeping coming from the amp on low freqs turned out to be the signal generator because it was also hearable in the laptop speakers.

Anyways i built a stereo version of my little amp today, pics are here.
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