I want to produce a frequency of 83.5 kilohertz, but all of the signal generators I have found that can produce in that range are very expensive. Can anyone tell me what type of circuit I could use to make a very precise frequency like that and, if you can, where I can find a diagram for it on the web?
2007-03-17 11:46:03 · 3 answers · asked by metaphysics1221 2 in Science & Mathematics ➔ Physics
There are plenty of VCO, PLL, and complete synthesizer chips for about 500 kHz of radio AM all the way up to GHz ranges. At your low 83.5 kHz, however, for the cheapest cost you may have to wire up a mixer and a dual channel synthesizer. Run one synthesizer channel at, X kHz and connect it to the LO port of the mixer, and the other at (X+83.5) kHz and connect it to the RF port of the mixer, then put a low pass filter, say an RC time constant of 1 ms (like 1 kohm resistor driving 1uF cap) for 160 kHz 3dB corner, at the output of the IF port to filter out the other beats and harmonics to keep your 83.5 kHz tone only.
Synthesizer chips come in all kinds of interface SCI, SPI, I2C, etc.... Search the Web for synthesizers IC you will see plenty of choices.
2007-03-17 12:41:45 · answer #1 · answered by sciquest 4 · 0⤊ 0⤋
Read this first:
http://en.wikipedia.org/wiki/Low_frequency
2007-03-17 19:12:08 · answer #2 · answered by Steve 7 · 0⤊ 0⤋
Have you browsed this site?
http://www.discovercircuits.com/O/o-rf.htm
2007-03-17 19:33:25 · answer #3 · answered by Helmut 7 · 0⤊ 0⤋