Re: [CAD_CAM_EDM_DRO] Re: Getting Parallel port to run relay

----- Original Message -----
From: "bertmantx" <bertmantx@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, January 27, 2005 10:58 PM
Subject: [CAD_CAM_EDM_DRO] Re: Getting Parallel port to run relay


>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Stephen Wille Padnos
> <spadnos@s...> wrote:
>> bertmantx wrote:
>>
>> >[snip]
>> >
>> >
>> >Shouldn't the circuit have fired with 5v power source going
> directly
>> >to Base? Or does it have to be current reduced with resistor?
>> >
>> >
>> If you attach a high current supply directly to the base of a
>> transistor, you'll fry the transistor. The effective circuit
> between
>> the base and emitter of a transistor is just a diode, so
> connecting V+
>> -> base ---- emitter -> ground is a bad thing.
>>
>> You can use anything between a 1K to a 5K resistor, depending on
> the
>> required relay current.
>>
> How much current is required to fire 2222 xsistor?
>
>
>
>
>
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