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Subject: Re: circuit help wanted

Date: 09/24/03 at 8:51 PM
Posted by: mike
E-mail: mcjh2[AT55]austin.rr.com (replace [AT55] with @ to reply)
Message Posted:

In Reply to: Re: circuit help wanted posted by John Flint on 09/24/03 at 8:41 AM:

Can you tell me more about the relay? What is the current rating or what is the resistance of the coil?

The 3055 is a 10A transistor and it does not have much gain. The min is 20. If the relay is really that much of a load, you might have to drive the 2n139 diode REALLY hard to get the 3055 to saturate.

I wouldn't even try to drive a 1 amp relay with these components.


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