Hi all.
I usually stick with the various T-amps as they sound the best IMO. I tried a PAM amp not long ago as well as a cheap TDA amp and was not impressed.
I have tried the TPA3116 and it was not half bad.
I am now listening to a TPA3123D2, but I find the sound stage smaller, a bit of harshness in the treble as well as some microdetails being lost.
The amp is an XY and the capacitors are cheap and probably poor (the first mod on many of these amps should be a low ESR cap swap to panasonic FM or similar).
So my questions is: What does the 470uF capacitor do in the output and why is it not a bipolar? I can´t seem to wrap my head around how a polarized cap in the signal path isn´t chopping half the sine?
Btw. I am not an engineer, just a hobbyist so pardon my ignorance 🙂. Hope someone will take the time to explain anyway.
I usually stick with the various T-amps as they sound the best IMO. I tried a PAM amp not long ago as well as a cheap TDA amp and was not impressed.
I have tried the TPA3116 and it was not half bad.
I am now listening to a TPA3123D2, but I find the sound stage smaller, a bit of harshness in the treble as well as some microdetails being lost.
The amp is an XY and the capacitors are cheap and probably poor (the first mod on many of these amps should be a low ESR cap swap to panasonic FM or similar).
So my questions is: What does the 470uF capacitor do in the output and why is it not a bipolar? I can´t seem to wrap my head around how a polarized cap in the signal path isn´t chopping half the sine?
Btw. I am not an engineer, just a hobbyist so pardon my ignorance 🙂. Hope someone will take the time to explain anyway.
Which PSU are you using? That has a huge effect on the output with these little boards.
The 470uF cap you're referring to is probably not on the output side but on the input. Input is DC, it's used as a power 'reservoir'. This bulk cap aids the PSU in delivering current though the amps during peaks.
Chopping of half the sine? I think you're confusing it with a diode. If it was on the output it would just pop.
The 470uF cap you're referring to is probably not on the output side but on the input. Input is DC, it's used as a power 'reservoir'. This bulk cap aids the PSU in delivering current though the amps during peaks.
Chopping of half the sine? I think you're confusing it with a diode. If it was on the output it would just pop.
A 6A 12V SMPS from Ebay. The same one I use with the T-amps.
Here is the datasheet
http://www.ti.com/lit/ds/symlink/tpa3123d2.pdf
I don´t mean the normal caps used as power buffer. Those the amp has too (connected to PVCCL and PVCCR). Those I will swap to u-low ESR when I get time.
Maybe I remember my capacitor theory wrong? I thought a polarized capacitor will block the DC if the DC is low enough to not cause the capacitor to break down (and catch fire/explode).
I made a DC blocking circuit a long time ago based on some post on here in relation to toroid humming due to dimmers in your house and I seem to recollect that capacitors where used to block the DC?
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains-5.html#post1261665
It is entirely possible that I got the theory wrong and just got it working by following instructions from on here 😉.
Here is the datasheet
http://www.ti.com/lit/ds/symlink/tpa3123d2.pdf
I don´t mean the normal caps used as power buffer. Those the amp has too (connected to PVCCL and PVCCR). Those I will swap to u-low ESR when I get time.
Maybe I remember my capacitor theory wrong? I thought a polarized capacitor will block the DC if the DC is low enough to not cause the capacitor to break down (and catch fire/explode).
I made a DC blocking circuit a long time ago based on some post on here in relation to toroid humming due to dimmers in your house and I seem to recollect that capacitors where used to block the DC?
http://www.diyaudio.com/forums/power-supplies/104626-dc-blocking-filter-mains-5.html#post1261665
It is entirely possible that I got the theory wrong and just got it working by following instructions from on here 😉.
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