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'[PIC] cheeeepest PIC SOIC 8 pin of all time'
2009\07\28@184336 by AGSCalabrese

picon face
Sorry for the possibly repeated question.....
I want the cheapest PIC that has internal clock good to 5% , input  
from switch, output to triac and output to 20 ma bi-color LED.
Should the LED be buffered ?
I want to run this off 220VAC / 110VAC as cheeeeeply as possible.
Should I use a resistor and zener ?

Unit will have PIC, one pushbutton, one triac, one bi-color LED, AC  
plug and socket.  It will be an inline power switch ( on/off only )

Best
Gus

2009\07\28@193445 by Spehro Pefhany

picon face
At 06:43 PM 7/28/2009, you wrote:
>Sorry for the possibly repeated question.....
>I want the cheapest PIC that has internal clock good to 5% , input
>from switch, output to triac and output to 20 ma bi-color LED.
>Should the LED be buffered ?
>I want to run this off 220VAC / 110VAC as cheeeeeply as possible.
>Should I use a resistor and zener ?
>
>Unit will have PIC, one pushbutton, one triac, one bi-color LED, AC
>plug and socket.  It will be an inline power switch ( on/off only )
>
>Best
>Gus

Not SOIC-8, but maybe you could use the PIC10F200- SOT-23-6 and around 30
cents (USD) in volume ... unless there is another I/O requirement you
have not mentioned.

Suggest you not run the LED at anywhere near 20mA- get a decent LED and
drive it directly at 5mA or so. In volume you can get whatever LED chips
you like in a dual LED.

A capacitor/zener power supply is more practical than a dropping resistor..
the circuit will run much cooler, and you already have a triac to deal with.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



2009\07\29@041524 by Alan B. Pearce

face picon face
>I want to run this off 220VAC / 110VAC as cheeeeeply as possible.
>Should I use a resistor and zener ?

I suggest you look at the 16FxxxHV series of devices. They have an internal
shunt regulator and need "only" an external dropper resistor to supply
suitable current to the device.

2009\07\29@041624 by Alan B. Pearce

face picon face
>I want to run this off 220VAC / 110VAC as cheeeeeply as possible.
>Should I use a resistor and zener ?

I suggest you look at the 16FxxxHV series of devices. They have an internal
shunt regulator and need "only" an external dropper resistor to supply
suitable current to the device.

2009\07\29@065130 by Jan-Erik Soderholm

face picon face
AGSCalabrese wrote:

> I want the cheapest PIC...

Wasn't sorting the parametric search list at Microchip
site enough ? That would give you a list in cost order
where you could either rad the list or add additional
filtering to norrow down the result.

Jan-Erik.


{Quote hidden}

2009\07\29@114115 by AGSCalabrese

picon face
No, the parametric search as not nearly good enough since
the members of the PIClist are much smarter than the "sort"
and suggest things to me such as looking at the "HV" parts.
Gus


On Jul 29, 2009, at 4:51 AM, Jan-Erik Soderholm wrote:

AGSCalabrese wrote:

> I want the cheapest PIC...

Wasn't sorting the parametric search list at Microchip
site enough ? That would give you a list in cost order
where you could either rad the list or add additional
filtering to norrow down the result.

Jan-Erik.


{Quote hidden}

2009\07\29@122511 by Ruben Jönsson

flavicon
face
>
> > that has internal clock good to 5% , input
> > from switch, output to triac and output to 20 ma bi-color LED.
> > Should the LED be buffered ?
> > I want to run this off 220VAC / 110VAC as cheeeeeply as possible.
> > Should I use a resistor and zener ?
> >
> > Unit will have PIC, one pushbutton, one triac, one bi-color LED, AC
> > plug and socket.  It will be an inline power switch ( on/off only )
> >
> > Best
> > Gus

Since you are making this transformerless you need to make sure that the
insulation requirements regarding accessible parts, especially for the switch
and the LED are satisified for a working voltage of 230VAC.

For the currents you are going to use (20mA LED) you might want to use a
capacitor instead of a resistor. Note that the capacitor should be of a type
X2. Even so, 20 mA plus the current for the rest of the circuit might be too
much.

If you have not done so already, take a look at Microchip's application note
AN954 about transformerless powersupplies.

<http://ww1.microchip.com/downloads/en/AppNotes/00954A.pdf>

/Ruben

==============================
Ruben Jönsson
AB Liros Electronic
Box 9124, 200 39 Malmö, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
.....rubenKILLspamspam@spam@pp.sbbs.se
==============================

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