Rerurn to Romy the Cat's Site


In the Forum: Off Air Audio
In the Thread: Rohde & Schwarz EU-6201 Tuner
Post Subject: The promising FM de-emphasisPosted by Romy the Cat on: 6/10/2008
I think I found a good configuration for de-emphasis. The air caps will not work as there is nothing to amplify the capacitance. RC filer with cap to ground is good but I would like to have the entire de-emphasis with no capacitor at all, it will be no DC blocking between multiplex decoder and op-amps and the DC will be offset in the Mileages manner. The LR low-pass filter is intereresting but I sceptick anout the series inductor in signal path. So, I come up with an elegent solution – do not use low-pass in series with output stage but to run high-pass in the op-amp’ feedback. The run a huge feedback anyhow, so sticking in there a couple series resostors with coil to ground ill do less posoble harm (I hope) of any other topology. I think it might be VERY promising.

Rerurn to Romy the Cat's Site