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Author Topic: AN7511 Mute  (Read 141 times)

VK6YR

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AN7511 Mute
« on: March 15, 2021, 06:10:22 AM »

I’ve searched for detail on the muting or squelch feature on the AN7511 audio IC but to no avail.
I would like to incorporate this option into a TXR project I”m working on. I would be grateful for any information or schematics on how to utilise pin 4 mute hopefully with a pot to set the level.
Thanks.
Geoff VK6YR
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W9IQ

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Re: AN7511 Mute
« Reply #1 on: March 15, 2021, 06:32:49 AM »

If you leave the mute unconnected, it will mute both outputs (>= 70 dB of attenuation). If you ground it, both outputs will be on.

In an RF prone environment, it would be wise to bypass the mute pin to ground with a ceramic capacitor.

If your goal is to control this via an audio source, you will need to add a comparator circuit to the design. This would allow you to use a pot to set the mute level.

Keep in mind that the AN7511  is an obsolete chip.

- Glenn W9IQ
« Last Edit: March 15, 2021, 06:51:21 AM by W9IQ »
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- Glenn W9IQ

God runs electromagnetics on Monday, Wednesday and Friday by the wave theory and the devil runs it on Tuesday, Thursday and Saturday by the Quantum theory.

VK6YR

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Re: AN7511 Mute
« Reply #2 on: March 15, 2021, 05:13:01 PM »

Thanks Glenn for your reply, much appreciated.
Geoff VK6YR.
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VE3WGO

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Re: AN7511 Mute
« Reply #3 on: March 26, 2021, 09:23:30 AM »

there is a datasheet for it at https://datasheet.octopart.com/AN7511-Panasonic-datasheet-88216.pdf

page 9 shows the recommended circuitry including for the mute pin to achieve what Glenn suggested.

73, Ed
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