Back to your reply:-
In the above cct the C 0.1uF in that case is acting as a DC blocker exactly the same as mine.
Mine has 100K to ground on the input and 1M to ground on the output, there is a reason, - why?
The TC, (time constant), on the O/P when not connected to anything at all is 1 Second.
This approximately gives me a turnover real audio frequency of 1Hz at 6dBV down. The upper limit depends on CCT strays. This TC is OTT for a 2 KHz chopper clock signal but I tend to go OTT at times.
I could have used 0.01uF and this would still work because the TC is 100Hz before turnover occurs.
The C is purely for AC coupling and is technically in fact a high pass filter not low pass. High-pass filter - Wikipedia, the free encyclopedia Low-pass filter - Wikipedia, the free encyclopedia
I want the 2 KHz to go through as it is AM at any random DC, in other words it is effectively a carrier of 2 KHz modulated at any random DC level.
It goes without saying that with a little jiggery pokery an AC signal modulating this carrier could be used to extend the BW of the MBPs microphone audio from DC - 20KHz fairly flat.
It works and if you want real AC coupled oscilloscope displays then I will create some when the box is finished.
And finally the WHOLE system is AC coupled so I don't really need the 1uF and 1M at all.
But this is modular project which leads to what I was taught......
NEVER put DC into any random black box system without some kind of blocking capacitor and in my case a 1M shunt resistor.
EDIT:
A simple CCT change that generates a 2KHz carrier at 1V P-P, where a maximum of 2V P-P signal, centred at 1V instead of ground, can modulate it from DC to say 200Hz.
Last edited by wisecracker; 01-31-2015 at 06:31 AM..
Reason: Add simple modified circuit.
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