MHz amplifier

Tekko · 20th April 2008, 09:25 PM

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:

Video.

DJ Exprice · 21st April 2008, 12:37 AM

Nice lookin'!

lumanauw · 21st April 2008, 03:24 PM

Nice

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

fumac

Tekko · 22nd April 2008, 04:39 PM

The amp sound reather good, i don´t 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.

20th April 2008, 09:25 PM	#1
Tekko diyAudio Member Join Date: Jan 2005	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: Video.

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21st April 2008, 12:37 AM	#2
DJ Exprice diyAudio Member Join Date: Mar 2006 Location: San Francisco, California	Nice lookin'!

21st April 2008, 03:24 PM	#3
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Nice Everything stays cool? At what rail voltage?

21st April 2008, 03:54 PM	#4
darkfenriz diyAudio Member Join Date: Jun 2004 Location: Warsaw	do you drive output inductor directly from mosfet driver?

21st April 2008, 04:58 PM	#5
Tekko diyAudio Member Join Date: Jan 2005	Yes. The thing get warm to the touch, rail volts is 15v regulated. I settled for 1.52MHz since it got hot above 2MHz.

22nd April 2008, 03:55 PM	#6
fumac diyAudio Member Join Date: Oct 2006	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

22nd April 2008, 04:39 PM	#7
Tekko diyAudio Member Join Date: Jan 2005	The amp sound reather good, i don´t 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.

23rd April 2008, 04:44 PM	#8
NeoY2k diyAudio Member Join Date: Dec 2007	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.

23rd April 2008, 09:40 PM	#9
Tekko diyAudio Member Join Date: Jan 2005	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.

26th April 2008, 08:00 PM	#10
Tekko diyAudio Member Join Date: Jan 2005	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.