Noise & VC Tone Filter Module

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4 thoughts on “Noise & VC Tone Filter Module

  • Thanks for putting up your schematic, it answers a lot of questions I had looking through the datasheet. I like the idea of having different filter cap values on the left and right channels and using the balance control to mix them, I’m definitely stealing that!

    • Awesome! Let me know how it turns out. The balance is interesting, it acts like a choke. In the middle, both sides let sound pass, but if you go left or right, it amplified and attenuates or attenuates and amplifies the signal. The capacitor imbalance allows more of the signal to get through and it’s an interesting distortion effect. Good luck with the build!

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    One thing I picked up from the datasheet is that pin 17 should be connected to the upper value of the control voltage range if you’re not using the internal potentiometer supply (tables at the bottom of page 5/top of page 6 of the September 1987 Phillips datasheet in case there’s multiple versions around). It’s not made particularly explicit in the text (it’s not the greatest datasheet, but at least it exists). I’m unsure how much of a difference it would make to the sound but it might be worth considering…?

    • Oh, Interesting! I didn’t notice that. It might be worth shorting it to see what happens. I just assumed it was supposed to sit there unused. The other option would be to connect it to the input potentiometers instead of +5v. Then you could swap the noise chip out for a transistor-based noise circuit and get rid of the 5v regulator altogether. If you end up trying it out, let me know! 🙂

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