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Subject: Re: Need to add a louder buzzer to a small kitchen timer

Date: 08/04/03 at 8:24 AM
Posted by: Russ Kincaid
E-mail: russ-nospam[AT55]engineer.com (replace [AT55] with @ to reply)
Message Posted:

In Reply to: Need to add a louder buzzer to a small kitchen timer posted by John on 08/03/03 at 8:17 PM:

The watch battery in the timer will not operate a relay, but could drive an npn transistor which would operate the relay. Use 1K in series with the base, collector to the relay to 9 volt source. Put a reverse diode across the relay coil to protect the transistor.


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