Recent Changes - Search:

go to the forum

Contents

Site

Help

« may 2025 · sep 2025 »

    add a calendar item

    Schematics / Four Pole Lowpass Filter

    Schematics.FourPoleLowpassFilter History

    Hide minor edits - Show changes to output

    2013-02-24 17:54 [UTC-7] by Blue Hell -
    Changed line 1 from:
    [[!DIY]] | [[!VCF]] | [[!Transistor ladder]] | [[!24 dB]] | [[!Four pole]] | [[!René Schmitz]] | [[!Moog]]
    to:
    [[!DIY]] | [[!Filter]] | [[!VCF]] | [[!Transistor ladder]] | [[!24 dB]] | [[!Four pole]] | [[!René Schmitz]] | [[!Moog]]
    2013-02-24 17:13 [UTC-7] by Blue Hell -
    Changed line 1 from:
    [[!DIY]] | [[!VCF]] | [[!Transistor ladder]] | [[!24 dB]] | [[!Four pole]] | [[!Rene Schmitz]] | [[!Moog]]
    to:
    [[!DIY]] | [[!VCF]] | [[!Transistor ladder]] | [[!24 dB]] | [[!Four pole]] | [[!René Schmitz]] | [[!Moog]]
    2013-02-24 15:52 [UTC-7] by Blue Hell -
    Added lines 1-3:
    [[!DIY]] | [[!VCF]] | [[!Transistor ladder]] | [[!24 dB]] | [[!Four pole]] | [[!Rene Schmitz]] | [[!Moog]]
    ----

    Added lines 1-5:
    Four pole Lowpass Filter by René Schmitz , this is René's version of Moog Type VCF ,make sure you visit his page for more details , circuitry and tips on OTA's , tempco and temperature compensation http://www.uni-bonn.de/~uzs159/index.html . From his notes on this filter :

    Although I have built various filters, I'd like to present my version of the famous Minimoog filter here. I have made some alterations to the circuit diagram that already floats around in the net. Some people have had difficulties when implementing it from that image. I know my version is not exactly like in the mini, but it works. I've found out that the matching of the transistors in the diffamp section is critical for the self oscillation. So Q7, Q5 and Q8, Q6 should be matched pairs. No need for all to have the same Vbe. I wonder why this isn't mentioned anywhere?!

    %width=95pct% http://electro-music.com/forum/phpbb-files/rsmoog_323.png

    Edit - History - Print - Recent Changes - Search Page last modified on 2013-02-24 17:54 [UTC-7] - 7859 views