Hi everyone.
I just finished making some speakers using markaudio chn-50 drivers, And now i am looking into either buying or building a small amp.
If i go with diy route what would be some decent 10-15w chip to base this amp on ?
I want something decent sounding and preferably powered by a single supply, But i can work with dual rail if necessary.
I was thinking of using lm1875, But the drawback is that it can't work with single rail.
Also i would need some decent dc protection circuit since i am not comfortable without one.
I just had my tda7294 amplifier blow up from esd discharge, When it blew up it let dc into one of the speakers. Luckily i turned it off immediately.
I just finished making some speakers using markaudio chn-50 drivers, And now i am looking into either buying or building a small amp.
If i go with diy route what would be some decent 10-15w chip to base this amp on ?
I want something decent sounding and preferably powered by a single supply, But i can work with dual rail if necessary.
I was thinking of using lm1875, But the drawback is that it can't work with single rail.
Also i would need some decent dc protection circuit since i am not comfortable without one.
I just had my tda7294 amplifier blow up from esd discharge, When it blew up it let dc into one of the speakers. Luckily i turned it off immediately.
This is really a great sounding option:
https://www.diyaudio.com/community/...-8r-mono-amp-kits.359193/page-18#post-7282599
https://www.diyaudio.com/community/...-8r-mono-amp-kits.359193/page-18#post-7282599
Here is a recommendation for current drive lm1875
https://www.diyaudio.com/community/...fication-to-current-drive.389985/post-7231489
https://www.diyaudio.com/community/...fication-to-current-drive.389985/post-7231489
I like the lm1875 and i have a transformer that i could use, But i would definitely like a dc protection circuit for it since it is direct coupled. I really dont want the dc on the speaker again if something goes wrong.
Thanks, i will look into that.
Also does anyone know any decent protection ic or something similar.
My experience with dc fault really scared me and if i decide to go with direct coupled output i am going to need a protection circuit.
Also does anyone know any decent protection ic or something similar.
My experience with dc fault really scared me and if i decide to go with direct coupled output i am going to need a protection circuit.
The single supply version of the LM1875 like most single supply amp circuits has an inherent output coupling capacitor which eliminates the need for DC protection...and when utilized in a proper circuit like in post #3, sounds pretty danged good.
Mike
Mike
Thanks, seems like a good option.
How does capacitor coupled stack up against dual rail and direct coupled ?
How does capacitor coupled stack up against dual rail and direct coupled ?
Thanks, maybe i will try it out, I hope i can use a switching power brick if i build it.
If there isn't too much noise from the switcher that would help with the idle power consumption.
If there isn't too much noise from the switcher that would help with the idle power consumption.
Your Mark Audio speakers deserve a good amp to unlock it's potential.
Then you won't find better sound for cheaper than this chip amp:
https://www.diyaudio.com/community/threads/what-the-heck-its-less-than-lunch.231988/
Lm1875 is more HI-FI than Tda7297 but you need two for stereo. Another good & less expensive chip is UTC tda2050l. With single supply version (post #3) you're on the safe side too & yes you can use laptop bricks as power supply.
Good luck
Good luck
Thanks, Lm1875 is not that expensive really so i will probably go with that. I wanted to build something based around it for a long time since it looked like a decent little chip.
I will be ordering some components from mouser anyways so i will just add the parts for the amplifier to the order.
I will be ordering some components from mouser anyways so i will just add the parts for the amplifier to the order.
Be sure to buy a PCB for LM1875. I built two point to point and they motorboated at 1/2 hz. Unfortunately ALL the PCB's available to me on ebay were dual supply speaker burners. I'm not building one of those. Capacitor protects the speaker in single supply amp. Project is under a pile of junk in the attic. I bought A Peavey M-2600 and repaired it.
Well i have seen some people have a good experience with perfboard layouts.
JohnAudioTech on youtube has some great videos on perfboard chip amps.
The key is usually a good ground layout with star grounding and without any ground loops.
I know how to build stuff on perfboards but i never really built a serious audio amp on one.
