Re: Q90 emitter current slowly increases over 15 seconds

Paul Jensen

On Mon, Dec 27, 2021 at 07:18 PM, Ashhar Farhan wrote:
The Q90 is getting hot which increases the collector gain and leads to higher current. As the Q90 package is small, the heat doesn't get out very efficiently .
Should the bias resistor, R81, be increased from 2.7k to 3k?  That is a 10% increase.

Or would it be better to increase the emitter resistor from 100 to 110?

Thanks for the help.

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