TDA2050 Input Sensitivity

jimbeam · 19th January 2004, 10:52 AM

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...

Can anyone help me out?

Mad_K · 20th January 2004, 06:31 AM

The input sensitivity is set by the the gain used in the circuit. If you can provide a schematic, we can help you out.

jimbeam · 20th January 2004, 09:00 AM

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!

Mad_K · 20th January 2004, 01:18 PM

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.

jimbeam · 20th January 2004, 08:56 PM

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!

Mashoni · 25th October 2010, 07:10 PM

is there a bridged circuit schematic for a TDA2050 chip out there since there was none on the datasheet.if anyone has please do me a favour and post it please thank you

ampimp · 27th October 2010, 09:27 AM

I would guess that bridging 2050 is much like bridging any other power op amp. Just stay in the soa of the 2050 and you should be ok.
Regards Ian

AndrewT · 27th October 2010, 12:02 PM

Hi,
bridging a current limited chipamp falls into the trap of ending up with an amplifier that can only perform well into high impedance loads.

19th January 2004, 10:52 AM	#1
jimbeam diyAudio Member Join Date: Jan 2004 Location: Germany	TDA2050 Input Sensitivity 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... Can anyone help me out?

20th January 2004, 06:31 AM	#2
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	The input sensitivity is set by the the gain used in the circuit. If you can provide a schematic, we can help you out. __________________ Mads K

20th January 2004, 01:18 PM	#4
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	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. __________________ Mads K

27th October 2010, 12:02 PM	#8
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, bridging a current limited chipamp falls into the trap of ending up with an amplifier that can only perform well into high impedance loads. __________________ regards Andrew T.

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20th January 2004, 09:00 AM	#3
jimbeam diyAudio Member Join Date: Jan 2004 Location: Germany	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!

25th October 2010, 07:10 PM	#6
Mashoni diyAudio Member Join Date: Oct 2010	is there a bridged circuit schematic for a TDA2050 chip out there since there was none on the datasheet.if anyone has please do me a favour and post it please thank you

27th October 2010, 09:27 AM	#7
ampimp Banned Join Date: Sep 2009 Location: coventry	I would guess that bridging 2050 is much like bridging any other power op amp. Just stay in the soa of the 2050 and you should be ok. Regards Ian

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