Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Solid State Amplifiers => Tubes and Hybrids => Topic started by: johngovan1234 on November 24, 2018, 09:10:42 AM

Title: Vox hybrid project
Post by: johngovan1234 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.
Title: Re: Vox hybrid project
Post by: edvard 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. 
Title: Re: Vox hybrid project
Post by: johngovan1234 on November 25, 2018, 03:10:53 AM
Thank you so much. I'll try your recommendations. I hope it will work well. :)
Title: Re: Vox hybrid project
Post by: edvard 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.