| jimbeam |
Hi everybody!
I'm currently working on a DIY guitar amplifier using the TDA2050 chip, but I'm not sure about the signal level that should be provided to the chip.
The Datasheet does not mention input sensitivity anywhere, so I'm a bit clueless... :confused:
Can anyone help me out? |
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| Mad_K |
| The input sensitivity is set by the the gain used in the circuit. If you can provide a schematic, we can help you out. ;) |
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| jimbeam |
The datasheet contains a suggested setup for the chip right on page 1, which I plan to use.
The amplifier will have a preamp section with tone and volume control, the tone section will cut around 6dB from the input signal, at least that's what Electronic Workbench is telling me.
If this was a normal opamp, the gain in this circuit would be 1 + (22K / 0.68K) = 33.35, and that's about 30dB, right? Now how does this determine the maximum input signal? I want to avoid overdriving the chip by all means, it's not a tube amp!
The TDA2050 will be supplied with +/- 21V, if that helps...
Thanks for your help! |
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| Mad_K |
Then, max input is +/-15V as per page 2 on the datasheet;)
however, it only takes 0,6V on the input to clip the output.
hint: read LM3875 datasheet, it is all explained nice and easy there (page 14).
edit: it is a normal opamp, your calculation is correct. |
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| jimbeam |
| quote: | | hint: read LM3875 datasheet, it is all explained nice and easy there (page 14). |
That's a good read, not just the usual curves and tables!
Since the signal is attenuated by the tone stack to about half its original level, the output stage will see a few hundred mV at full volume setting, so there should be no problems with clipping.
Thank you for your patience! |
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