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Headphone amplifier output capacitor safety
Headphone amplifier output capacitor safety
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Old 14th February 2020, 08:22 PM   #11
GoatGuy is offline GoatGuy  United States
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Baudouin's schematic is just fine. Could I also recommend a amp fast-blow fuse in line, too? That way, if the 12 V Zener stack is conducting too aggressively on a blown capacitor, well … the fuse will also pop. Probably saving the Zeners, and debugging them, and all that.

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Old 14th February 2020, 08:24 PM   #12
monty78pig is offline monty78pig  England
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Headphone amplifier output capacitor safety
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Baudouin's schematic is just fine. Could I also recommend a amp fast-blow fuse in line, too? That way, if the 12 V Zener stack is conducting too aggressively on a blown capacitor, well … the fuse will also pop. Probably saving the Zeners, and debugging them, and all that.

I doubt you'll be able to get half an Amp out of the cathode of most triodes... Perhaps a fusible resistor? But that of course comes with the penalty of reducing damping factor.
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Old 14th February 2020, 11:00 PM   #13
Ti83 is offline Ti83  United States
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The zener clippp does look nice. Thanks guys.
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Old 14th February 2020, 11:07 PM   #14
audiowize is offline audiowize  United States
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Quote:
Originally Posted by monty78pig View Post
Cathode followers always power up very nicely due to the inherent delay in conduction as the filaments warm up.
Yes, it's this. The question here is not how to completely eliminate any possible DC offset from ever coming out of the headphone jack, it's whether this is an actual issue.

In practice that 30uF cap probably isn't big enough, and at 100uF you'll need to build the circuit and fine tune the value of that 10K resistor at the output to pull down the voltage spike sufficiently.
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