on off relay

[Smokeyone]

Does anyone have a diagram or an idea to make a 12v relay switch
itself on & off very slowly - maybe every second or one and half
seconds. I could make it a 6v relay if the problem would then be
easier.

Thanks

Smokeyone

 

[Hal Murray]

In article <124432c0.0312132327.395acb39@posting.google.com>,
mailcuttysark@btopenworld.com (Smokeyone) writes:

Does anyone have a diagram or an idea to make a 12v relay switch
itself on & off very slowly - maybe every second or one and half
seconds. I could make it a 6v relay if the problem would then be
easier.

The modern approach would probably be a tiny microprocessor.
But that's overkill for your problem.

The intermediate approach is a 555 timer chip. They come
in many versions.

The old fashioned approach is a multivibrator: 2 transistors,
2 resistors, and 2 caps. (I think. It's been a long time.)

Don't forget the protection diode on the relay driver.

--
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[Watson A.Name - "Watt Sun]

In article <vtoc9g52a44o06@corp.supernews.com>,
hmurray@suespammers.org mentioned...

In article <124432c0.0312132327.395acb39@posting.google.com>,
mailcuttysark@btopenworld.com (Smokeyone) writes:
Does anyone have a diagram or an idea to make a 12v relay switch
itself on & off very slowly - maybe every second or one and half
seconds. I could make it a 6v relay if the problem would then be
easier.

The modern approach would probably be a tiny microprocessor.
But that's overkill for your problem.

Yes, it's overkill.

The intermediate approach is a 555 timer chip. They come
in many versions.

Good idea.

The old fashioned approach is a multivibrator: 2 transistors,
2 resistors, and 2 caps. (I think. It's been a long time.)

Or else one of these.
http://ourworld.compuserve.com/homepages/Bill_Bowden/page5.htm#flash2.
gif

Don't forget the protection diode on the relay driver.

Exactly.



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[Hal Murray]

The modern approach would probably be a tiny microprocessor.
But that's overkill for your problem.

Yes, it's overkill.

But worth keeping in mind. If you already have a tiny uP in the
area and it has one unused pin...

--
The suespammers.org mail server is located in California. So are all my
other mailboxes. Please do not send unsolicited bulk e-mail or unsolicited
commercial e-mail to my suespammers.org address or any of my other addresses.
These are my opinions, not necessarily my employer's. I hate spam.

 

[Smokeyone]

Thanks everyone for the advice. Looks like a 555 timer chip might be
the way to go. Can you run 6 to 12v through the chip............and
after searching various sites it looks as though the chip can operate
my solenoid direct without going through a relay.................hope
I have this right.

Smokeyone

to e-mail me, delete mail from address

 

[William P.N. Smith]

mailcuttysark@btopenworld.com (Smokeyone) wrote:

Thanks everyone for the advice. Looks like a 555 timer chip might be
the way to go. Can you run 6 to 12v through the chip............and

Yes, IIRC, the 555 runs from 5-15 volts, though there may be
extended-range versions of it as well.

after searching various sites it looks as though the chip can operate
my solenoid direct without going through a relay.................hope

Yes, it's got (again IIRC) 250mA source or sink current. As someone
mentioned, make sure you use a diode snubber across the relay coil.

--
William Smith
ComputerSmiths Consulting, Inc. www.compusmiths.com

 

[Smokeyone]

William P.N. Smith <> wrote in message news:<hc9stvob27bo82tsn8359h0nfku4blog0s@4ax.com>...

mailcuttysark@btopenworld.com (Smokeyone) wrote:
Thanks everyone for the advice. Looks like a 555 timer chip might be
the way to go. Can you run 6 to 12v through the chip............and

Yes, IIRC, the 555 runs from 5-15 volts, though there may be
extended-range versions of it as well.

after searching various sites it looks as though the chip can operate
my solenoid direct without going through a relay.................hope

Yes, it's got (again IIRC) 250mA source or sink current. As someone
mentioned, make sure you use a diode snubber across the relay coil.

Thanks again for the advice

Smokeyone