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Frequency Converter Circuit? Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Wed, 25 Feb 2015 08:49:33 In Reply to: Re: trans speedo gear, thetallguy [Profile/Gallery] , Tue, 24 Feb 2015 17:47:59 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The mechanical problem of a broken speedo drive gear in the transmission is calling out for an electronic solution: a frequency converter, which would take the signal put out by one of the ABS sensors and convert it to the frequency range needed for the speedometer. At some point in my education/career I had a good idea how to make one, but those days are gone. I think that done properly, this would be much more reliable than a mechanical solution made from bits of hardware.
Basically (from Wikipedia):
"Frequency converter may also refer to a much-lower-powered circuit that converts radio frequency signals at one frequency to another frequency, especially in a Superheterodyne receiver. See Frequency mixer. The circuit usually consists of a local oscillator and frequency mixer (analog multiplier) that generates sum and difference frequencies from the input and local oscillator, of which one (the Intermediate frequency) will be required for further amplification, while the others are filtered out. The same result was achieved historically by the pentagrid converter or a Triode and Hexode in a single tube, but can be implemented in transistor radios economically by a single transistor functioning as a self-oscillating mixer."
Anyone know how to do this?
posted by 108.71.132...
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