Hello Dears,
I am try to go active on the bass with a II order active crossover with a Linkwitz-Riley slope (Q=0.5) as the one described here:
Active Filters
the II order xover should fit in my design pretty well based on calculations and measurements. While I want the highpass at fixed output, I would like to have the low pass adjustable.
The real problem to is how to buffer it.
Input buffer: my tube preamp needs at least 100KOhms load to really sing, and this spec is fully accomplished by my amp at the moment. Somebody suggested to used a a simple cathode follower tube buffer and to place the xover near the preamp.
Output buffer: the ideal situation would be to have an output which makes possible to adjustments in the range of +/- 3dB, so an output buffer and a volume pot is needed. Could you suggest some circuit that can do this.
Best Wishes
Pietro
I am try to go active on the bass with a II order active crossover with a Linkwitz-Riley slope (Q=0.5) as the one described here:
Active Filters
the II order xover should fit in my design pretty well based on calculations and measurements. While I want the highpass at fixed output, I would like to have the low pass adjustable.
The real problem to is how to buffer it.
Input buffer: my tube preamp needs at least 100KOhms load to really sing, and this spec is fully accomplished by my amp at the moment. Somebody suggested to used a a simple cathode follower tube buffer and to place the xover near the preamp.
Output buffer: the ideal situation would be to have an output which makes possible to adjustments in the range of +/- 3dB, so an output buffer and a volume pot is needed. Could you suggest some circuit that can do this.
Best Wishes
Pietro
> Could you suggest some circuit that can do this.
A current sourced JFET source follower using a pair of matched 2SK372Vs.
See also :
http://www.diyaudio.com/forums/pass...urce-follower-configurations.html#post1592491
Patrick
A current sourced JFET source follower using a pair of matched 2SK372Vs.
See also :
http://www.diyaudio.com/forums/pass...urce-follower-configurations.html#post1592491
Patrick
> compare datasheets for 2SK372 and 2SK363
http://www.diyaudio.com/forums/pass-labs/175040-more-fet-noise-measurements-evul.html#post2326966
There is of course another reason to use 2SK372 -- a thermal coupling one.
Patrick
http://www.diyaudio.com/forums/pass-labs/175040-more-fet-noise-measurements-evul.html#post2326966
There is of course another reason to use 2SK372 -- a thermal coupling one.
Patrick
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