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Old 24th October 2011, 03:18 PM   #1
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Default Mute transistor choices?

Horrors, I just found out that my favorite mute transistor, the Toshiba 2SC3326 is no longer available. In fact, it has been my favorite so long, that I don't remember using any other. So, what are you using, any that you find particularly good?

Good:
-low resistance => good attenuation, the whole point
-transparent sound (On the other hand, I would think most are when used to short the signal to ground, not putting signal through the device)
-available
-cheap(ish)
-relatively robust against ESD

Thank you for pointers!
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Old 31st October 2011, 02:50 AM   #2
wtk98 is offline wtk98  United States
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2SC2878 muting and switching applications: VCE=20V: IC=0.3A: Pc=0.4W; Vcesat=42mV
Do not know availability.
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Old 31st October 2011, 07:20 AM   #3
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Isn't the CB capacitance at low Vce when the transistor is OFF important? This is the parameter that will affect music when unmuted
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Old 31st October 2011, 07:26 AM   #4
Mooly is online now Mooly  United Kingdom
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Have you considered using FET's instead of bjt transistors ?

Marantz SA8001 Modification to Eliminate Distortion
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Old 31st October 2011, 07:38 AM   #5
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I prefer relays. In a resistor and shunt contact configuration there is no contact in the signal path. Telecom relays have lower stray capacitance than any common semiconductor device and very good ON resistance. The only penalties are power consumption and cost
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Old 31st October 2011, 08:01 AM   #6
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Would BF862 from NXP make a good muting transistor ?
http://www.nxp.com/documents/data_sheet/BF862.pdf
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Old 31st October 2011, 08:39 AM   #7
Mooly is online now Mooly  United Kingdom
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Quote:
Originally Posted by rrrremus View Post
Would BF862 from NXP make a good muting transistor ?
http://www.nxp.com/documents/data_sheet/BF862.pdf
Quite possibly yes...
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Old 31st October 2011, 08:57 AM   #8
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Vgs OFF MIN is -0.3V, so the gate voltage would have to be arranged to closely track the source when ON
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Old 31st October 2011, 09:13 AM   #9
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Quote:
Originally Posted by davidsrsb View Post
Vgs OFF MIN is -0.3V, so the gate voltage would have to be arranged to closely track the source when ON
I'm no expert, but please help me understand.
In a muting circuit the Source would be connected to ground while the drain would be connected to the signal line.

With zero volt present at the gate, the transistor would "pull" to ground.
With a few volt of negative voltage at the gate the transistor would be open.

How can you track the source then ?
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Old 31st October 2011, 09:21 AM   #10
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Sorry, I was thinking about series switching. For shunt you want source to ground and switch the gate between 0V and about -12V
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