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Self-heating of crystal in inverter oscillator
On 2006-07-04, Mike Monett wrote:
Ben Jackson wrote: The two 100p might be slightly too high for the 18p crystal I'm using, Hi Ben, Thanks. What is the nominal setting of the cap in series with the crystal? 18pf or so? The "varicap" is actually a red LED, which G0UPL characterized as about 30p down to about 20p over 0..5V: http://www.hanssummers.com/radio/varicap/index.htm Do you have any info on the crystal, such as make and model? It's a Digi-Key X231-ND, mfg p/n ECS-250-18-4-F. Digikey has the datasheet. I think the ESR was 40 ohms. Would you like me to post the results to my web site? Sure. -- Ben Jackson http://www.ben.com/ |
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