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Muting Transistor Attenuator Circuits and the 2SC2878
https://www.diyaudio.com/community/attachments/muting-transistor-attenuator-circuits-and-the-2sc2878-pdf.1017514/
A muting transistor has very low ON resistance –in the order of 1Ω. With a 1K audio signal source resistance, it provides 60db attenuation –this is much better than the best analog switches in the ON mode. In audio mixer applications additional attenuation (perhaps 80db) is recommended to completely silence unused inputs.
Muting Transistor Attenuator Circuits and the 2SC2878 ...
https://www.electroschematics.com/muting-transistor-attenuator-circuits-2sc2878/
A muting transistor has very low ON resistance –in the order of 1Ω. With a 1K audio signal source resistance, it provides 60db attenuation –this is much better than the best analog switches in the ON mode. In audio mixer applications additional attenuation (perhaps 80db) is recommended to completely silence unused inputs.
Muting Circuits For Audio - sound-au.com
https://www.sound-au.com/articles/muting.html
To make the signal audible again, a transistor is turned on that energises the relay coil and removes the short. This can be done after a power-on delay, or at the touch of a button (local or remote). With a bit of extra circuitry, the mute can …
US7734265B2 - Audio muting circuit and audio muting …
https://patents.google.com/patent/US7734265B2/en
A transistor is provided that is connected between an audio line where the audio signal is transmitted and a line of a reference potential, is rendered nonconductive when …
Muting an audio signal with a transistor - General ...
https://forum.arduino.cc/t/muting-an-audio-signal-with-a-transistor/246666
Glue a big LED, as close to the size of the photocell as possible, to the photocell. Paint it all black or enclose it in black heat shrink. Turn the LED on, photocell goes low resistance and mutes. Some signal may still get through, but it should be very quiet. In general, the larger the photocell, the lower the resistance when well-lit.
US20070093221A1 - Audio muting circuit and audio …
https://patents.google.com/patent/US20070093221A1/en
A transistor is provided that is connected between an audio line where the audio signal is transmitted and a line of a reference potential, is rendered nonconductive when …
Muting Transistor (15V, 1A)
https://media.digikey.com/pdf/Data%20Sheets/Rohm%20PDFs/2SD1468S_RevB.pdf
Muting Transistor (15V, 1A) 2SD1468S ... equipment or devices (such as audio visual equipment, office-automation equipment, commu-nication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant.
NPN Epitaxial Planar Transistor AUDIO MUTING …
http://ftp01.cystekec.com/BTD1304A3.pdf
NPN Epitaxial Planar Transistor AUDIO MUTING APPLICATION BVCEO 20V BTD1304A3 IC 500mA Features • High Emitter-Base voltage, VEBO=12V(min). • High reverse hFE, reverse hFE=20(min.) @VCE=2V, IC=4mA. • Low On-resistance, Ron=0.6Ω(max)@IB=1mA. • Pb-free and halogen-free package.
Audio output muting circuit | All About Circuits
https://forum.allaboutcircuits.com/threads/audio-output-muting-circuit.177462/
The 2SC2878 gives a very low resistance when biased on. The reverse breakdown on the emitter is very high so it will not clip the audio signal. KTD1302 is also designed for this kind of use. You can use other transistors such as the 2N2222 just be careful not to exceed the emitter-base breakdown voltage.
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