stamps and SCR''s
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Bill,
If you wanted to drive optos from all the Stamp pins, you would run out of
drive current. Opto-isolators use around 5-10 mA to drive. You would need
to use a buffer so the stamp could handle the load. Pick an opto with the
right "personality" maybe something in the MOC30xx group. There are lots of
choices available. I did get a couple of toes stuck in my mouth on my last
message. I said the optos are available 1,2 or 4 in a package. That's
usually only the case with low voltage optos. The ones for SCRs & triacs
usually come one per.
At 12:13 PM 12/5/00 -0700, you wrote:
>assuming you were going to use all stamp pins on a bs2, which opto would you
>use?
>
>Lee Harker wrote:
>
>> Chris,
>> If you intend to use the SCR for 110VAC, I would highly recommend using an
>> opto-isolator made for driving SCRs & triacs. You can get them in 1, 2 or 4
>> per DIP package and they are cheap. They usually offer about 3000 volts of
>> isolation to protect your Stamp or other low voltage circuitry. They are
>> packaged so that the input and output are on opposite sides of the package.
>> If you plan to make a PCB using these, it is usually a good idea to use
>> this arrangment to keep all low voltage on one side and the high voltage on
>> the other side of the board.
>>
>> At 09:29 PM 11/5/00 -0400, you wrote:
>> >Has anyone out there ever crossed the big divide between a stamp
>> >output and an SCR gate?
>> >
>> >Chris
>> >
>> >
>> >
>> >
>
>
>
>
Lee Harker
258 Metals Development
Ames Laboratory
Iowa State University
If you wanted to drive optos from all the Stamp pins, you would run out of
drive current. Opto-isolators use around 5-10 mA to drive. You would need
to use a buffer so the stamp could handle the load. Pick an opto with the
right "personality" maybe something in the MOC30xx group. There are lots of
choices available. I did get a couple of toes stuck in my mouth on my last
message. I said the optos are available 1,2 or 4 in a package. That's
usually only the case with low voltage optos. The ones for SCRs & triacs
usually come one per.
At 12:13 PM 12/5/00 -0700, you wrote:
>assuming you were going to use all stamp pins on a bs2, which opto would you
>use?
>
>Lee Harker wrote:
>
>> Chris,
>> If you intend to use the SCR for 110VAC, I would highly recommend using an
>> opto-isolator made for driving SCRs & triacs. You can get them in 1, 2 or 4
>> per DIP package and they are cheap. They usually offer about 3000 volts of
>> isolation to protect your Stamp or other low voltage circuitry. They are
>> packaged so that the input and output are on opposite sides of the package.
>> If you plan to make a PCB using these, it is usually a good idea to use
>> this arrangment to keep all low voltage on one side and the high voltage on
>> the other side of the board.
>>
>> At 09:29 PM 11/5/00 -0400, you wrote:
>> >Has anyone out there ever crossed the big divide between a stamp
>> >output and an SCR gate?
>> >
>> >Chris
>> >
>> >
>> >
>> >
>
>
>
>
Lee Harker
258 Metals Development
Ames Laboratory
Iowa State University