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Tekko 20th April 2008 09:25 PM

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:

DJ Exprice 21st April 2008 12:37 AM

Nice lookin'!

lumanauw 21st April 2008 03:24 PM

Nice :D
Everything stays cool? At what rail voltage?

darkfenriz 21st April 2008 03:54 PM

do you drive output inductor directly from mosfet driver?

Tekko 21st April 2008 04:58 PM

Yes. The thing get warm to the touch, rail volts is 15v regulated.

I settled for 1.52MHz since it got hot above 2MHz.

fumac 22nd April 2008 03:55 PM

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 :)


Tekko 22nd April 2008 04:39 PM

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.

NeoY2k 23rd April 2008 04:44 PM

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.

Tekko 23rd April 2008 09:40 PM

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.

Tekko 26th April 2008 08:00 PM

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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