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How can a single diode (as in a crystal set) perform as a mixer??. I havent heard of this one before.
What does the phrase "supplies the troughs" actually mean?? I may be able to guess but readers should not have to guess what is meant
Light current22:24, 9 August 2005 (UTC)reply
I think that most of the material under 'multiplying mixers' in this article is total tosh. Diode mixers do not work by rectifying the signals as this article seems to be saying. As is explained in the
Frequency mixer article, and hinted in the heading, they work by multiplying two signals together. Then there is some mathematical magic that explains how come various new frequency signals are created by such a multiplication.
In the case of AM signals, there is a place for the rectification that is badly described here, but it is in signal
detection, not mixing (hence the above confusion about crytal sets - they use the diode as a detector, there is nothing to mix).
There is talk about merging that part of this article with Frequecy mixer. I would hate if all that junk was dumped into that article. What this article should be is a two-way disambiguation page that simply explains the difference between additive and multiplicative signal mixing, gives a few examples of each (like audio and maybe video mixers on the one hand, and radio transmitters and receivers and maybe oddities like bat detectors and old-fashioned musical synthesisers on the other) and provides links to all the relevant articles in each case.
I have taken some of the more glaring falsehoods out of this article but it still probably a candidate for merge/deletion. The two topics in this article have been artificially welded. They really have nothing to do with each other. I left the Gilbert mixer alone because I am unfamiliar with that circuit but the description is so simplistic it is almost a truism.
SpinningSpark23:31, 29 September 2008 (UTC)reply
Ah, just found a circuit for a Gilbert cell. It is based on two coupled long-tailed pairs. That circuit has a more well known name but I can't think what it is right now.
SpinningSpark15:37, 30 September 2008 (UTC)reply