What the heck? It's less than lunch!

[vacuphile]

You guys are spending way too much on amplification:

https://www.aliexpress.com/item/PAM...id=4c01175a-102c-43e4-80d5-3c65dc33502c&tpp=1

I ordered some, anybody else tried these already?

 

[OffGridKindaGuy]

Hey vac..

Not to steal the thread, but yes! They are a very good board as an amp but they sure put the R.F. noise out.. (Forget connecting to a FM tuner)

 

[prezden]

Can anyone recommend a good bluetooth amp to run on 12v battery supply?

 

[birca1987]

Look at this one http://www.diyaudio.com/forums/showthread.php?t=300028

Sent from my ONE A2001 using Tapatalk

 

[danschy]

Not sure best place to post this question - thought I'd try here. Wanted a small, low power amp to drive speakers for testing purposes; a cheap TDA7297 amp board seemed to fill the bill, so I bought a couple from wfyb on Ebay. Initial testing produced around 7% distortion at 1W, 1kHz, which was a bit shocking. Took a hard look at the layout and saw it was pretty bad. I cut and jumpered to isolate input and output sections and managed to get the distortion down to 0.6%, which was still far above the spec limit of 0.1%. I figured maybe I had some counterfeit devices, so bought a couple from Mouser. The new ones looked absolutely identical to the ones received with the board. Nevertheless, I installed one and found the distortion was up to 2%. Anyone have any experience with distortion measurements on this device? I'm wondering if it really makes its claimed spec of 0.1% distortion.

 

[danschy]

Not sure best place to post this question - thought I'd try here. Wanted a small, low power amp to drive speakers for testing purposes; a cheap TDA7297 amp board seemed to fill the bill, so I bought a couple from wfyb on Ebay. Initial testing produced around 7% distortion at 1W, 1kHz, which was a bit shocking. Took a hard look at the layout and saw it was pretty bad. I cut and jumpered to isolate input and output sections and managed to get the distortion down to 0.6%, which was still far above the spec limit of 0.1%. I figured maybe I had some counterfeit devices, so bought a couple from Mouser. The new ones looked absolutely identical to the ones received with the board. Nevertheless, I installed one and found the distortion was up to 2%. Anyone have any experience with distortion measurements on this device? I'm wondering if it really makes its claimed spec of 0.1% distortion.

All the above measurements were single-ended since I didn't want to have to float my measurement system to measure across the load. I decided to just do it, and the distortion dropped to under 0.2%, so I'm happy. Apparently some of the single-ended distortion products cancel out in bridged mode.

 

[Destroyer OS]

For anyone looking for boards

http://www.diyaudio.com/forums/group-buys/309860-folsom-diy7297-amp-antipole-psu.html

 

[prezden]

Look at this one Sanwu TDA7492P + Bluetooth 2.1

I have a couple of these running on 12v batteries. Overall they sound pretty good. Big problem I have is streaming from my old macbook. Sounds breaks up a lot. Works much better with my cell although a little noisy.

 

[twocents]

preamp

I have a $2 TDA7297 diy kit on my way from China. Read through most of this thread but did not see any mention of preamps. Does this amp need, or benefit from, a preamp? Or maybe a B1 buffer? Thanks.

 

[lacro]

This works great with TDA7297

 

[canvas]

You guys are spending way too much on amplification:

1pcs PAM8610 2x15W amplifier board digital two channel stereo power amplifier board miniature-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group

I ordered some, anybody else tried these already?

85 cents a piece? That's incredible.

 

[twocents]

85 cents a piece? That's incredible.

Yes, incredible. Here is something more in the spirit of diy, and ready to mod from the start:
Free Shipping 2set TDA7297 amplifier board parts dc 12v 2.0 dual audio encoding 2*15w electronic diy kit 2PCS/LOT-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group

I was wondering - if you have 2 of these amps - bridging them is not possible (I read somewhere in this thread), but can one run them as two mono blocks, and will there be any advantage in doing this?

 

[Destroyer OS]

Yes, incredible. Here is something more in the spirit of diy, and ready to mod from the start:
Free Shipping 2set TDA7297 amplifier board parts dc 12v 2.0 dual audio encoding 2*15w electronic diy kit 2PCS/LOT-in Integrated Circuits from Electronic Components & Supplies on Aliexpress.com | Alibaba Group

I was wondering - if you have 2 of these amps - bridging them is not possible (I read somewhere in this thread), but can one run them as two mono blocks, and will there be any advantage in doing this?

More current for harder impedance loads.

 

[zek]

If then the outputs 1 and 2 are in parallel, and the inputs 1 and 2 are in parallel?

 

[Destroyer OS]

Yes.

But you should try a ballast resistor between the two inputs.

 

[zek]

What values to take?

 

[Destroyer OS]

You could try 1k between R&L, inputs.

 

[zek]

Thanks.

 

[xrk971]

All Lunch Money amp fans - check out the Coffee Money amp!

http://www.diyaudio.com/forums/chip-amps/310816-tda2030-coffee-money-headphone-amp.html#post5150348

 

[sffrhd]

LED comes on! But I only get hum coming out of the speakers (I can turn up the volume of the hum). Was trying to follow DestroyerOS ver1 build guide. Does anyone see anything out of place?
Thanks,
Doug