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Subject: high temp oscillator problem

Date: 06/27/01 at 1:27 PM
Posted by: Brent K. Bouws
E-mail: brent@twisthink.com
Message Posted:

Hi, I built an LC oscillator circuit to operate at 2.8MHz, but at high temperatures the frequency drops. I've added thermistors and a varactor to compensate, but its not enough. I'm using a 2n4401 transistor, but can find no information on its temperature response. Will this device slow down at 80 degrees C or will Vbe change? All the other components have enough temperature information for me to determine its not them, but the transistor has next to nothing on the subject. Any help would be greatly appreciated.


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