True.
A good point for those who add a hell of passive and active stuff in a power amplifier to add zeroes in their claimed THD 0.0000001% figure.
True.
Actualy the point is:
What do you prefer:
_An electrolytic cap in the signal path ?
_A hell of paralleled film caps ?
_A servo with a small film cap ?
Similar question about cars that have servos at brakes and steering.
These "extra components increase the unreliability" of the car but would you prefer to drive a car with none of these servos ?
@snowcatmaiden
I assume that your application is for home audio. In that case, diodes etc. as mentioned here previously would be a good starting point.
If it is for pro audio, where it might be connected to an input with Phantom supply, it is a different matter. In that case you would probably want to add a proper Phantom protection.
I assume that your application is for home audio. In that case, diodes etc. as mentioned here previously would be a good starting point.
If it is for pro audio, where it might be connected to an input with Phantom supply, it is a different matter. In that case you would probably want to add a proper Phantom protection.
😀😀😀
maybe making like first watt preamp is the safest.
Just one JFET and then cap in cap out. 😀
Yes it is for home audio. 🙂
I wonder if I can use zeners to ground instead of diodes to power rails?
So I can control the peak voltage.
//
Well this will just increase the load if connect to ground, but not protecting the output. 😱
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You can use zeners, but their tolerance is pretty poor, at least in my experience, so I'd measure each pair first before installing them. The advantage of clamps to the supply is that they scale with the power supply voltage directly, and stay "out of the way" of the signal more predictably, without measuring or matching.
For ESD strikes, zeners to ground seem to be a bit more effective though, since clamp diodes to the supplies really don't consume the transient, they simply stuff it onto the PSU rail and hope that there's a low Z bypass cap somewhere close by that will eat the pulse. In my case, I'm using relatively few PSU bypass caps and instead rely on regulator impedance to create a low Z supply, so supply clamps are less than 100% effective. I've added a few other zener-like clamps (Littelfuse PGB102ST23WRHF) to the input and output signal lines, and while they clamp at a pretty high voltage, they don't add any distortion that I can detect with low impedance nodes, and the extra clamping seems to help overall.
For ESD strikes, zeners to ground seem to be a bit more effective though, since clamp diodes to the supplies really don't consume the transient, they simply stuff it onto the PSU rail and hope that there's a low Z bypass cap somewhere close by that will eat the pulse. In my case, I'm using relatively few PSU bypass caps and instead rely on regulator impedance to create a low Z supply, so supply clamps are less than 100% effective. I've added a few other zener-like clamps (Littelfuse PGB102ST23WRHF) to the input and output signal lines, and while they clamp at a pretty high voltage, they don't add any distortion that I can detect with low impedance nodes, and the extra clamping seems to help overall.
You can use both. Use say a 5V zener to set up a 5V threshold and point the protection diode to that 5V. Then your limit is about 5.5V. Same for -5V and neg peak protection.
Jan
Another protection device: Transient-voltage-suppression diode - Wikipedia
A Zener made for that and it exists as a two Zener back to back in the same part.
A Zener made for that and it exists as a two Zener back to back in the same part.
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I would use an appropriate value electrolytic. Paralleled film caps would have a large surface area so increase stray capacitance and interference pickup or unwanted capacitive feedback.mchambin said:
Poor analogy. If the servo fails in a car there is usually still some control action. If the servo fails in an amplifier then it produces the very effect it is supposed to prevent.
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