I'm missing a 3.3uF Cap,
can't find one thats not polar anywhere
is that cap important?
or can I replace it with a 10K resistor to provide impedance?
can't find one thats not polar anywhere
is that cap important?
or can I replace it with a 10K resistor to provide impedance?
The cap isolates any DC offset from getting into the amp. You can't substitute a resistor.
You can parallel smaller values to get a larger one.
You can parallel smaller values to get a larger one.
I'll see if I can find anything
Is the diagram at ESP wrong?
the 3.3uF is a non-polar
while for the rest of his designs, the input cap is usually polar EC
Is the diagram at ESP wrong?
the 3.3uF is a non-polar
while for the rest of his designs, the input cap is usually polar EC
The input capacitor and the input resistor form a high-pass filter that cuts out DC and low frequencies. This filter's "half-power" frequency is 1 / (2 * PI * R * C).
Punching in the numbers, I get 3.3 Hz with a 2.2 uF cap (R=22K). Anything frequency BELOW this will be reduced in volume by the filter. I think even a 1 uF cap would be fine ( = 7 Hz), unless maybe it's a subwoofer amp.
Punching in the numbers, I get 3.3 Hz with a 2.2 uF cap (R=22K). Anything frequency BELOW this will be reduced in volume by the filter. I think even a 1 uF cap would be fine ( = 7 Hz), unless maybe it's a subwoofer amp.
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