Anyone ever use the MB3712 ic amp here is my schematic

Started by mountianjustice, March 13, 2015, 05:41:39 PM

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mountianjustice

http://i1381.photobucket.com/albums/ah234/mountianjustice/mb3712%20schematic_zpsbj1o1ksh.png

I cannot find very much info on this chip does anyone have any suggestions or ideas to improve on my design. Also what can i do with it i'm just using it as a small amp right now running @ 18vdc 1.1a  but id like to use it in a more elaborate design. It has a nice clean sound at low volume but does get some nice overdrive distortion with the small 32ohm 5 watt speaker i used for testing.

anchovie

Datasheet for an equivalent IC: http://home.hccnet.nl/w.geeraert/pdf515/ECG1423_ECG1424__MB3712_MB3713.pdf

The example circuits are all using pin 6 for input rather than pin 8. Input impedance is only 50kOhms so you'd probably benefit from a buffer if you're plugging a guitar straight in, or a complete preamp. It's not intended to be anything more than a simple power amp so put whatever you need to get the right sound up front and use this to make it louder!

18V is the absolute maximum rated supply voltage so I'd suggest using 15 or 12 instead.
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mountianjustice

#2
   Thanks for the info Anchovie. Im planning on running a Baxandall passive tone stack on it i've got it boarded up and i'm tinkering with the Duncan tone stack calc to try and boost the mids but the damn stack just wont let it happen. It sounds good as is but if it would just have a little more mid kick i think this tone circuit would rock for bass. Im also planning on putting a 12ax7 gain circuit in it and putting it in my vox vt20+ that crapped out on me after only about 6 mos. maybe some switchable clipping diodes in there somewhere who know just want to make it a kick ass home brew bedroom banger. I have a Marshall full stack setting here beside me if i need volume well actually it not setting here it more of lurking menacingly in the corner. Im not sure weather to run the Baxandall tone before or after the tube boost/preamp? I do already have made up a 3 tube 12ba6 booster with gain knobs on each tube that would be 6 knobs, a power switch, an on indicator light, input jack and i guess a headphone jack i got a coupe 120-150 ohm 10m watt resistors could even do a line out i guess if it sounds good. Ill keep it posted as i go im usually a start to finish kind of guy once i start it i usually dont stop till its done or i blow it up. :icon_twisted:  Heres is the schematic for the tone stack im using. The one on the duncan site has some different values but when i put mine in the isn't much of a difference mostly below 200hz and above 8khz.
http://i1381.photobucket.com/albums/ah234/mountianjustice/baxandall%20tone%20stack_zpsal0laqnv.gif