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Author Topic: Vox hybrid project  (Read 302 times)

johngovan1234

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Vox hybrid project
« on: November 24, 2018, 09:10:42 AM »

I made a vox top boost preamp. And i'd like to hook it into a class d TPA3116 power amp. Should i put preamp or buffer or DI circuit to the tpa3116 amp? Or hook the vox preamp straight into the tpa3116 input? Hope someone might help me. Thank you.
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edvard

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Re: Vox hybrid project
« Reply #1 on: November 24, 2018, 11:33:10 PM »

You should be able to simply hook it right in.  Make sure you have a large-ish decoupling capacitor at the power amp input.  I see from the datasheet they recommend 1uf caps at both INPR/L and INNR/L pins.  That should be a good start. 
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johngovan1234

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Re: Vox hybrid project
« Reply #2 on: November 25, 2018, 03:10:53 AM »

Thank you so much. I'll try your recommendations. I hope it will work well. :)
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edvard

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Re: Vox hybrid project
« Reply #3 on: November 25, 2018, 04:38:25 AM »

Be sure to read the datasheet docs very carefully.  Class D amplifiers can be somewhat different beasts from 'normal' ones, and I don't have any personal experience with them; I just noted what is on the datasheet.  I also noticed that the input pins are supposed to be differential.  Does that mean the INN pins can be grounded and the INP pins carry signal?  I don't know, and it would probably be worth it to find out.  Read the docs and do a little searching around.  It may turn out that you'll need a phase split circuit between the preamp and power amp.
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