Just Curious....
Has anyone ever built a box to remove the 75u pre-emph from a processed signal?
If so, how did you do it?
Has anyone ever built a box to remove the 75u pre-emph from a processed signal?
If so, how did you do it?
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Has Anyone Ever Built a De-emphisis box?
- Thread starter gettinbyagain
- Start date
Would this be on the transmit end or the receive end?
gettinbyagain said:
It's a simple RC circuit with the time constant of 75 us (T=R*C). So if you take 0.1 uF capacitor, you'd need 750 Ohm resistor. If you are connecting it to a high impedance input, it can be just that. If not, you need to buffer it with something (ie. op-amp as a voltage follower).
Regards,
Goran Tomas
Goran is correct but you must drive the circuit from a low impedance source.
If the circuit is on the 600 ohm balanced transmit end, put an RC network on each side of the balanced line, cut the resistor values in half and double the value of the capacitors.
If the circuit is on the 600 ohm balanced transmit end, put an RC network on each side of the balanced line, cut the resistor values in half and double the value of the capacitors.
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