Coupling caps

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ebag4

Coupling caps
« on: 30 Mar 2011, 01:07 am »
I have a Dodd buffer that is using .047uF output caps to hi pass the signal to the main amp.  It is driving a self modded T-amp that has input coupling caps.  Is there any reason I shouldn't remove the input caps on the T-amp?

Thanks,
Ed

bigdirty

Re: Coupling caps
« Reply #1 on: 30 Mar 2011, 01:27 am »
one concern, when you use your amp with another piece of gear. be sure it has the output coupling caps

Steve

Re: Coupling caps
« Reply #2 on: 30 Mar 2011, 03:05 am »
I have a Dodd buffer that is using .047uF output caps to hi pass the signal to the main amp.  It is driving a self modded T-amp that has input coupling caps.  Is there any reason I shouldn't remove the input caps on the T-amp?

Thanks,
Ed

Hi Ebag4,

It depends upon the value of the amp cap. It is in series with the .047uf and will change the overall cap value, especially if the input Z of the amp is determined after the input capacitor. If the amp cap is large compared to the .047uf, it probably won't make a huge difference.

Another concern is if the amp cap is removed, voltage (bias) is present at the input, and a short occurs in the IC or other place in the input path.

As long as the amp cap is very large or you are assured no short is possible (with amp input voltage being present) the probability of problems should be low.

Cheers.