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PICList Thread
'Switching mains'
1998\05\01@151242 by Mwa.Dekkers

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Hi there!

Has anyone out there experience with switching mains power (220v /
3amps) from a 12c508 ? (I'm trying to switch a PC ON and OFF)

I'm trying to find a cheap but reliable method. I heard the cheapest
method is using a triac.

Could anybody give me a hint on what the wiring-diagram would look like
???

Thanx in advance.

Max Dekkers,Netherlands

1998\05\01@192744 by Harold Hallikainen

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       See the datasheet on the Motorola MOC3010, which should be
available on the web.  It includes some typical circuits.  You may also
want to consider just buying a Solid State Relay.  These have either a
triac or a pair of SCRs along with all the drive circuitry and opto
isolation in a package.


Harold



On Fri, 1 May 1998 18:20:54 +0200 "Max Dekkers,ri"
<spam_OUTMwa.DekkersTakeThisOuTspamnet.HCC.nl> writes:
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1998\05\02@195135 by Mike Keitz

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On Fri, 1 May 1998 18:20:54 +0200 "Max Dekkers,ri"
<.....Mwa.DekkersKILLspamspam@spam@net.HCC.nl> writes:
>Hi there!
>
>Has anyone out there experience with switching mains power (220v /
>3amps) from a 12c508 ? (I'm trying to switch a PC ON and OFF)
>
>I'm trying to find a cheap but reliable method. I heard the cheapest
>method is using a triac.

The cheapest method is usually an old-fashioned electromagnetic relay.
They are also decently reliable and much more resistant to spike and
surge damage than electronic switching.  You will usually need a small
transistor and diode to drive the relay from a PIC pin.  Of course, if
the application involves frequent switching, a relay can wear out.  About
10,000 cycles over the life of the device seems like a good place to draw
the line.

_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]

1998\05\03@043559 by Russell McMahon

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I use the Motorola MOC3041 + an external TRIAC for most
applications where low voltage controlled mains switching is
required.

Its marvelous! Design effort is minimal. Duplicate basic
circuit in data sheet (using larger TRIAC as your actual
power switch and away you go. For very (very) light mains
loads you may be able to use the MOC device alone with no
extra TRIAC. Note the 15ma drive requirement. This is the
worst case figure but whereas an opto may often be operated
with far less than this, in this case they really mean it.
eg 5ma probably won't work.


The device is a zero crossing optically isolated logic
driven triac made to drive larger TRIACs.
Note implications of zero crossing switching on your
application (in most cases this is what you will be aiming
for but not in every case).

Operation and circuit is super simple -

See data sheets from Motorola (faxback) or elsewhere on web
but BASIC details  are as follows:

Connect driver output (pin 4) to main TRIAC gate.
Connect Driver out (pin6) via 51r resistor to TRIAC Anode.
Connect resistor (330r) from TRIAC gate to ground IF TRIAC
does not have internal resistor here (many do).

Drive MOC input with at least 15ma (PIC pin can do this)
(Pin 1 is diode anode = +ve. Pin 2 is diode cathode = -ve).


RS sell these - part 301-628 (but they should be MUCH
cheaper elsewhere). I pay under $NZ1.00 which is about
$US0.50 in moderate quantities (50?).



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