LP-BP-HP filter

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isak
 
Posts: 835
Joined: Wed May 27, 2009 3:54 pm

LP-BP-HP filter

Post by isak »

Hi moders :)

can i do in the x0x bandpass or highpass filter in 3 way mod switch ?
3 way mod :
1 - LP (as it is now)
2 - BP
3 - HP

thanks

Isak :)

Gaetano
 
Posts: 158
Joined: Tue Dec 18, 2007 2:15 am

Re: LP-BP-HP filter

Post by Gaetano »

The short answer is no, it would be good if you could do that. The easiest thing you could do, is put in an extra filter board for an op-Amp based filter in addition to the x0x LPVCF, but without a lot of extra work it would not be voltage controlled, or have a variable resonance like the x0x VCF. You would need to use something like an OTA (different type of op-Amp), like the BA6110 in the x0x or a CA3080 or LM13700. Checkout the datasheet for the LM13700, it has a part on VCF's:

http://www.national.com/ds/LM/LM13700.pdf

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