Adding NE5532 PreAmp to TPA3255 300W + 300W Amplifier Project

In this video 'Adding NE5532 PreAmp to TPA3255 300W + 300W Amplifier Project’ I’ll show the preamplifier I plan to use for this project. I'll also show how to measure the input and output of the preamp using dB readings from my FLIR multimeter.

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[versace]

Hi Eddie, awesome tutoring. Great video. Thanks a lot.😊👍

[darrylfletcher]

Thanks Eddie for sharing, great explanation and measurements.

[tuttocrafting]

Hey kiss! I've managed to find the issue with the amp i was having. It was faulty chips. PBTL pin was shortened!.

Now I'm wondering how gain in such device works. My chain is completely digital (PCM/I2S)

I've measured the input signal and the digital signal and the digital path seem fine!

Now I have to figure out why setting 0dB in the volume control i have a very limited amplification... Seems like that the internal gain of the amplifier is low.

Sometimes analog is a lot easier than digital stuff even for IT guys that works with digital stuff all the day!

[andymouse]

Eddie ya didn't really say much about the preamp ! have you reviewed it before ? and 1v input is quite a bit but thanks for the 'dB' stuff...cheers.

[sparkyskinner]

Interesting project. Curious about the gain though. As stated in an earlier comment, are you planning on passive or an active RIAA filter ? And, where do you plan on putting the RIAA filter in, or between which stages of amplification ? Only bring this up as you do say your interested in using this set up for a phonograph. Thanks for the video and sharing your experience, Eddie.

[davyisbert]

Hi Eddie
I've used different preamps (chineeses) and tryed to plug them to different class D amps. But all the time, I can ear a hum or buz... I think it's an impedence adaptation problem. How do you face this problem please ?

[ssgeek]

Adding a phono cartridge from a turntable will work but...there will be issues with sound quality.RIAA eq. But try it. That how we learn stuff.great job

[johnshaw]

Preamp can be between 6-15db gain, assuming a power amp gain of 26db. It should be able to swing at least 2V p-p for around 500mv input. You could make the preamp gain adjustable or a high/low (12db/6db) type arrangement.

[fredflintstone]

The part about fluke equipment which was always somewhat funny and ironic to me is the name, 'Fluke':
fluke
3 of 3
noun (3)
2
: a stroke of luck

I don't like the idea that my Fluke meter working properly is a 'stroke of luck'... 🤣🤣
I've had a number of fluke meters down through the decades that were unreliable. Older models. My 787 will sometimes stop showing anything on the display and I have to cycle the switch to bring it to life, no it's not the battery saving timeout/shutoff, it will do it as soon as I turn it on half the time, probably need to take it apart and clean the contacts. It's 'fluky'.
fluky
adjective
ˈflü-kē
variants or less commonly flukey
flukier; flukiest
1
: happening by or depending on chance
2
: being unsteady or uncertain —used especially of wind
🤣🤣

[nsqtr]

Ne5532 or JRC4580, which one is better

[davidkclayton]

Not sure why you need to drive the amp more than a volt. Also if you're going to amplify a turntable photo cartridge you will need RIAA Equalization.

[HipocratesAG]

That JAT PS is just a click bait.
KA: hours of videos and months of planning, using obsolete parts to make a product that is already available for $35.
JAT: Hold my beer... I'm going to use a 470uf cap and a diode to show you a good PSRR amp.
Come on man.