TDA7294V MUTE/ST-BY voltage +5V or +VCC ?

thoronx · 2nd July 2008, 04:09 PM

I have a question about the mute and stadby function of the TDA7294V, I saw several designs using 5V Zener, and designs where they connect those pins to +Vcc, according to manual max voltage mesured from -vcc is 100 or 120 V, so from my point of view if I use +-30V it is far in this voltage area, so what is the point of using 5V Zener is it "better" solution ... or why do they use it to disable mute and stadby ?

pacificblue · 2nd July 2008, 05:58 PM

The manual states "CMOS logic compatible input pins", so anything above 3,3 V should do. If you look at it that way the solution with the 5 V Zener is more adequate and more elegant.

Maybe it is also a question of experiences people make. Not long ago there was a thread in this forum, where a Jeff Rowland amp had some 20 or so TDAs (out of 48!) with shot standby or mute inputs. I can only guess, but maybe there is a connection to using the Typical Application from the manual instead of the Zener solution?

chrswlr · 2nd July 2008, 08:10 PM

I'm using a zener to avoid plopping sounds when the power is turned off. The other filter circuits in the loudspeaker use the same supply and start producing plopping sounds when the voltage decreases. Hence I want the tda to go into mute earlier than necessary when the powersupply drops. Works nice.

YFW · 4th July 2008, 02:39 PM

You could connect to +Vcc in series with a 1K resistor,easy and safe.

Minion · 4th July 2008, 03:42 PM

I just connected mine to the Possitive rail and it worked fine....

2nd July 2008, 04:09 PM	#1
thoronx diyAudio Member Join Date: May 2007	TDA7294V MUTE/ST-BY voltage +5V or +VCC ? I have a question about the mute and stadby function of the TDA7294V, I saw several designs using 5V Zener, and designs where they connect those pins to +Vcc, according to manual max voltage mesured from -vcc is 100 or 120 V, so from my point of view if I use +-30V it is far in this voltage area, so what is the point of using 5V Zener is it "better" solution ... or why do they use it to disable mute and stadby ?

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2nd July 2008, 05:58 PM	#2
pacificblue diyAudio Member Join Date: May 2008	The manual states "CMOS logic compatible input pins", so anything above 3,3 V should do. If you look at it that way the solution with the 5 V Zener is more adequate and more elegant. Maybe it is also a question of experiences people make. Not long ago there was a thread in this forum, where a Jeff Rowland amp had some 20 or so TDAs (out of 48!) with shot standby or mute inputs. I can only guess, but maybe there is a connection to using the Typical Application from the manual instead of the Zener solution?

2nd July 2008, 08:10 PM	#3
chrswlr diyAudio Member Join Date: Nov 2007	I'm using a zener to avoid plopping sounds when the power is turned off. The other filter circuits in the loudspeaker use the same supply and start producing plopping sounds when the voltage decreases. Hence I want the tda to go into mute earlier than necessary when the powersupply drops. Works nice.

4th July 2008, 02:39 PM	#4
YFW Account Disabled Join Date: Jun 2007	You could connect to +Vcc in series with a 1K resistor,easy and safe.

4th July 2008, 03:42 PM	#5
Minion diyAudio Member Join Date: May 2006	I just connected mine to the Possitive rail and it worked fine....

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