Hi,
I have one of these can someone please explain how it works to me like I'm 5.
I'll have a go, line-level input (shared ground) into separate op-amps for L/R then into separate TPA3255's and then outputs to capacitors and inductors.
What exactly are the op-amps doing in this design, is the line-level around 1V and the TPA3255 needs an input signal with a higher voltage?
I have really no idea what the big caps and inductors are doing, smoothing maybe?
Speakers are driven by AC right, so the TPA3255 outputs AC?
The 1V gets boosted to X and it goes through the amp and comes out at like 80V or something?
Say this is being fed with 36V DC with at least 5A where is that 90W/channel going, how do you feed this properly, I read the higher the voltage the louder it goes, but what about amps current, say I attached a 24V 20A supply to it, how many amps would it draw?
Why does it have 44-pins, that seems like a lot?
I'm not really wanting more than 50W/channel from this and I'll normally be listening at less than half of that.
I want to use this in an active bi-amp speaker pair, probably driving the left and right channel 6.5" woofers (8ohm, 89dB, 60W), any mods you would make, any pitfalls?
Could I setup another one of these boards to do the tweeters, to keep the amplifiers consistent, I think they would be too powerful, could I run them at 24V, "permanently" attenuate the input with a resistor voltage divider (I'll be using DSP volume), tweak the op-amps?
Thanks
Richard
I have one of these can someone please explain how it works to me like I'm 5.
I'll have a go, line-level input (shared ground) into separate op-amps for L/R then into separate TPA3255's and then outputs to capacitors and inductors.
What exactly are the op-amps doing in this design, is the line-level around 1V and the TPA3255 needs an input signal with a higher voltage?
I have really no idea what the big caps and inductors are doing, smoothing maybe?
Speakers are driven by AC right, so the TPA3255 outputs AC?
The 1V gets boosted to X and it goes through the amp and comes out at like 80V or something?
Say this is being fed with 36V DC with at least 5A where is that 90W/channel going, how do you feed this properly, I read the higher the voltage the louder it goes, but what about amps current, say I attached a 24V 20A supply to it, how many amps would it draw?
Why does it have 44-pins, that seems like a lot?
I'm not really wanting more than 50W/channel from this and I'll normally be listening at less than half of that.
I want to use this in an active bi-amp speaker pair, probably driving the left and right channel 6.5" woofers (8ohm, 89dB, 60W), any mods you would make, any pitfalls?
Could I setup another one of these boards to do the tweeters, to keep the amplifiers consistent, I think they would be too powerful, could I run them at 24V, "permanently" attenuate the input with a resistor voltage divider (I'll be using DSP volume), tweak the op-amps?
Thanks
Richard
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Reading more about op-amps and also Ohms law and the op-amp seems to be used to also increase the current, I think the TPA3255 needs these voltages on the audio input side:
Analog supply (min) 10.8V
Analog supply (max) 13.2V
Analog supply (min) 10.8V
Analog supply (max) 13.2V
I need to get my head around power, this amp is basically a power amp (I think I should be looking at the PBTL specs), maximum amplification will always be performed and if the input analog voltage is the maximum then this is going to put out the maximum watts it can. What about:
Total Output Power at 1%THD+N
Total Output Power at 10%THD+N
On this Samp-200 amp with the only things that I control being the analog input signal and power supply how do I "set" it to 1%?
The TPA3255 datasheet talks about the over-current programming resistor (ROC) with the example being 22kΩ (10A?), I'm assuming my amp just used this value, does that restrict it to 10A by clipping?
Back to driving a small tweeter, maybe I just power the tweeter amp with a 2A 24V supply? I was thinking about a shared PSU (say 12A 24V), for two boards (L/R woofers and tweeters) but would that mean that the tweeters are able to pull too many amps?
Apologies for all the newbie ramblings, I know I'm lacking some fundamentals.
Total Output Power at 1%THD+N
Total Output Power at 10%THD+N
On this Samp-200 amp with the only things that I control being the analog input signal and power supply how do I "set" it to 1%?
The TPA3255 datasheet talks about the over-current programming resistor (ROC) with the example being 22kΩ (10A?), I'm assuming my amp just used this value, does that restrict it to 10A by clipping?
Back to driving a small tweeter, maybe I just power the tweeter amp with a 2A 24V supply? I was thinking about a shared PSU (say 12A 24V), for two boards (L/R woofers and tweeters) but would that mean that the tweeters are able to pull too many amps?
Apologies for all the newbie ramblings, I know I'm lacking some fundamentals.