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  • 3 Band graphic equaliser

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  • Simple Surround Sound Decoder

    Introduction This surround-sound decoder is based on the “Hafler” principle, first discovered by David Hafler sometime in the early 1970s. The original idea was to connect a pair of speakers as shown in Figure 1, for use as the rear speakers in the surround setup. VN:F [1.6.9_936]please wait…Rating: 10.0/10 (1 vote cast)VN:F [1.6.9_936]Rating: +1 (from […]

  • Expandable Graphic Equaliser

    Introduction The project described in this article is a constant Q, fully expandable graphic equaliser.  Where most “conventional” graphic EQ circuits have a Q that is dependent on the setting of the pot, this one maintains the same Q at all settings.  This is achieved by using MFB (Multiple Feedback Bandpass) filters, instead of the […]

  • Reverse RIAA Equaliser

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  • Surround Effect

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  • Tone Control Circuit

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  • Tone Control

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  • Audio Graphic Equaliser

    Audio graphic equalizers are very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. I didn’t design this one but it’s really very simple. The details shown are for a 7 band but the principle can be extended to almost any number of bands – […]