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#3
July 1st 06, 08:23 AM
posted to rec.radio.amateur.homebrew
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Self-heating of crystal in inverter oscillator
On 2006-06-30, wrote:
From a stability factor point of view those "inverter" based oscillators are amoung the worst. Good to know. I was trying to reduce part count -- the quad XOR provides the two oscillators plus one mixer. and I bet there are parameter shifts in the "chip" as it warms up The other parameter shift I was missing was droop in the 5V rail as the 78L05 warmed up (rapidly!) and noise injected by a MAX202 charge pump also on that 5V rail. I thought that regulator was just for an (unused) LCD header, but I was wrong. I suggest a discrete Bipolar or FET where you can control the operating point of the device better. If I can't tame this VCXO I will try that. This must be how Manhattan prototyping branches off into "Ugly"... -- Ben Jackson http://www.ben.com/ |
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