TDA7294V MUTE/ST-BY voltage +5V or +VCC ? - diyAudio
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Old 2nd July 2008, 04:09 PM   #1
thoronx is offline thoronx  Yugoslavia
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Default 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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Old 2nd July 2008, 05:58 PM   #2
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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?
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Old 2nd July 2008, 08:10 PM   #3
chrswlr is offline chrswlr  Netherlands
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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.
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Old 4th July 2008, 02:39 PM   #4
YFW is offline YFW  United States
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You could connect to +Vcc in series with a 1K resistor,easy and safe.
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Old 4th July 2008, 03:42 PM   #5
Minion is offline Minion  Canada
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I just connected mine to the Possitive rail and it worked fine....
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