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Introduction   In a recent thread here, I mentioned to dubbie that it might be possible to use the balanced modulator in an RF mixer chip to create a Dalek sound effect. Later on, I discovered that I had a couple of them [in the old DIL package, too], so I though I'd do a quick bit of hardware hacking and see how they manage at audio frequencies. The mixer is based on a Gilbert cell, which will, of itself, work right down to dc, but there is internal biasing of the transistors, which t ...