Careful here, an SCR will not turn off ntil the CURRENT drops below a
certain value. This can be very important when dealing with
inductive/capacitive loads. TTYL

> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of PDRUNEN@AOL.COM
> Sent: Tuesday, February 19, 2002 11:33
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: SCV vs Transistor
>
>
> You can switch on an SCR.  However, the SCR will not switch off until the
> voltage across it terminals drops to near zero volts.  This is good if you
> are chopping a sine wave to generate an average voltage for light or motor
> control.  But not good if you want to switch DC loads on/off.
>
> Also, switching an SCR on/off with a high dv/dt will cause noise, so don't
> mix SCR switching with RF receivers....
>
>
>
> Cheers,
>
> Paul
>
>
> In a message dated 2/19/02 9:52:31 AM EST, syates@CARETECH.COM writes:
>
> << I know this is a basic question, but I need to ask it.
>
>  I have always used a transistor driven by the pin of a PIC to turn on and
>  off high current devices (relays, buzzers whatever).  I saw a
> design where
>  someone was using an SCR.
>
>  Is there any operational difference when the application is switching not
>  amplifying?
>  Is there a signifigant cost difference?
>
>  What I am getting at is why would one use and SCR instead of a
> transistor.
>  They are even in the same TO package.
>
>  Any input appreciated.
>
>  Shawn >>
>
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