DIY amp for speakers

[evilkitty]

I have these parts:

• speakers: https://usa.yamaha.com/products/audi...l#product-tabs
• sound card: https://www.newegg.com/asus-xonar-dgx/p/N82E16829132052

Looking at this amp board:
https://www.ebay.com/itm/384899115622

I want to take the front header audio from the sound card and run that to the amp which will be mounted to a old PCI 54k modem's bracket (speaker wire would pass though the hole for the RJ11 socket) and i would power this amp board using my system PSU, now this board says 12v is in the operating voltage range, but should i be using a boost converter? if so what is a cheap one i can get for this? i'm not sure how many amps this amp pulls

i assume this amp board is reasonable for these speakers

Maybe this converter would be fine? https://www.ebay.com/itm/384733453111

[sam_sam_sam]

Re: DIY amp for speakers

I would highly suggest that you use very good quality wiring that is shielded for best results
Also get a good quality power amplifier that only requires 12 volt maximum for best results the one you chose would be ok but I do not know if I would use a boost converter you might have interference from the converter weather or not could use filtering capacitors if this is an issue

One thought if could find a Bluetooth card for a computer interface might be better choice if you want to use higher voltage on the amplifier module

With the amplifier that you choose make sure that it can handle 6 ohm speakers

And you should have a good sounding system

Back in the day when sound cards came out there were good sounding systems I have one that I use on my computer but I would not be able find another one with this quality

You might be able to use what you have in mind with out issues but just keep in mind that using a boost converter might be an issue

[evilkitty]

Re: DIY amp for speakers

That amp says it can do 120W speakers, my speakers says 120Watt max and 35W nominal, so i assume it can handle them based on that

Managed to find more info on the amp, if you run at 12v you can do 50W speakers

as far as noise from a boost converter can i not use one of these? https://www.mouser.com/new/coilcraft...wer-inductors/

i do not plan to run these speakers at max volume (it is a small room, seems like a bad idea to do) so i guess i could just run at 12v and effectively just cap the volume?

[evilkitty]

Re: DIY amp for speakers

I found a different board that uses 2 of the same chip so it can handle more current: https://www.ebay.com/itm/302749492150

https://www.ti.com/product/TPA3116D2

if i use a boost converter to power it at over 12v this is not gonna really pull ~17 amps from my power supply will it, speaker watts are not the same as actual power draw there is it? i find it hard to believe that could be how it really works, but it would explain why amplifiers cost so much and they would need to be built with 1200W power supplies and would need on dedicated breakers

[lti]

Re: DIY amp for speakers

Figures 13 and 14 in that datasheet show the maximum output power over the supply voltage range. I would guess that you'll get about 10W per channel into 6 ohms.

Power consumption will vary with the audio level.