Fasten seat belts. TDA8932 pessimistic review.

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#325
matt_garman said:
I've not tried different power supplies with the tda8932 amps.

With the tpa311x amps, my favorite power supply is the Connex SMPS300R. But I haven't tried the power supply in my picture with the tpa311x amps.

Here's one ebay link for that power supply. Note there is at least one variation on it. I have two of these, the model number appears to be WX-DC2416.
Click to expand...

Hi, concerning the WX-DC2416 power supply:
- how does it work?
- did you perform any electrical test?
- does the power supply switch normally on with a big capacitor (say 6800uF) on its output?

I’ve had some negative experiences with cheap chinese SMPS, so before buying another one, I try to get more information.

Thanks
 
#326
#327
fulvio said:
Hi, concerning the WX-DC2416 power supply:
1. how does it work?
2. did you perform any electrical test?
3. does the power supply switch normally on with a big capacitor (say 6800uF) on its output?
Click to expand...

1. Seems to work OK. I put it in the enclosure pictured a few posts back with two of the tda8932 mono boards. No issues so far. Hard to say how long it will last or if the performance will change over time. But for a super cheap amp build, I think it's perfect.

2. None, other than hooking up a DMM to verify the output voltage was in fact 24V. Somewhere in this tpa3118 thread there's a bit of discussion on this power supply. Someone put it on a scope, and showed pretty decent performance (relative to the super-cheap price). IIRC, performance improved measurably after the mods.

3. Haven't tried that, so I can't say! It does have short-circuit protection, so I'm sure there's a capacitance amount where it thinks there is a short and shuts down. I did try to use it to hot-rod a dustbuster (small hand-held vacuum cleaner). The dustbuster's rechargeable batteries degraded to the point of being useless. So I thought I'd give this PSU a try in that role. But it appears the motor initially looks like a short, so the PSU would go into shutdown after less than a second. Note I tried several SMPSes in this role, and they all exhibited the same behavior. I could only get the motor to turn on with batteries or a linear PSU.

This is my first time working with these cheap SMPSes, so it's hard to say how they'll perform in the long run.
 
#328
#331
m0b1liz3 said:
Haha, wow, we posted at exactly the same time. That is a good find. I am just a little confused by the front part of the case. It seems to have some sort of socket. Why put it in a case if you still need to plug in some sort of interface at the front? (I assume that is for volume control and power on/off??)
Click to expand...

Sanwu's Taobao listing for that amp doesn't have any details about the connector. I'd guess it is there to simplify integration, if integration is desired.
 
#336
Still on TDA8932.
Today I hooked my little module to a polk speakers plus polk sub. Now I have basses more then enough, a lot of bass and my impression is that highs are weak.
Until now all my tests was with car speakers, very powerful, but still car speakers.
Sound is completely different and is hard to have any conclusion about flatness, lack of basses or highs.
For input I use my archos multiplayer and I don't know what is the right input level.
Any ideas ?
 
#337
TDA8932 is sensitive to its power supply and in my experience its impossible to decouple that well enough to get pristine highs. But with a higher load impedance the power supply becomes less critical - to raise the impedance of my speakers I use output transformers and this cleans up the highs nicely.

I'd definitely not recommend car speakers with TDA8932 as they tend to be rather low impedance (due to cars having low voltage supplies).
 
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