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W7TI ) writes:
On Fri, 18 Jul 2003 14:05:06 +0200, "Tom" wrote: If you read my original post again or at least the topic, it says 0-12 (not 0, 12) MHz. And that would mean something in the range between 0 and 12. I don't remember when and WHERE i said that i need 0 MHz oscilator. The only one who talks about 0 MHz osc is you. __________________________________________________ _______ Perhaps English is a second language for you, but when you say 0-12 that will be taken to mean those two frequencies and everything in between. -- Bill, W7TI And of course, even if such a full range oscillator was not intended by the original poster, I'd say there often is a big difference between oscillators in the KHz range and those in the MHz range. Obviously, the concept of an oscillator doesn't change, but the specific design does. You can use resistors and capacitors to set the frequency down near the audio range, and do your best to avoid coils down there due to their size, while once you get into radio frequencies, one tends to use coils for the frequency control element. Time after time, I see people asking questions about oscillators, and often they are coming to radio frequencies from an audio background. So they think in terms of just scaling some favorite audio oscillator up to radio frequencies, when a simpler solution would be to use an LC oscillator. Somewhere in this thread, the 8038's more recent spawn was mentioned. Obviously, it will work over that full range, but I'm suspicious about how good it will be at radio frequencies, as I would about any RC oscillator. It seems a stretch to expect it to work as well at 12MHz as at 10KHz. Michael VE2BVW |