design help

If it would be better to do the timing part with a 555 I could go that way? Not sure about what it would look like though.

On a sunny day (Tue, 24 Feb 2009 08:17:20 -0500) it happened "jamesgangnc" wrote in :

The modern way to do these things, especially with long time constants, is an 8pin PIC micro controller and a power MOSFET to drive the relay.

No other external parts are needed, not even the diode over the relay, as there are MOSFETS with avalanche protection zeners. The small PICs will use the on chip oscillator to do very accurate timing, and have pull up resistors on some pins to make interfacing to switches that switch to ground easy. A simple voltage divider or zener will give you the 5 V supply for the PIC.

Ze time off ze dranzister and are-see networks is over....

So a voltage regulator, a PIC, a development system, a programmer, and a couple of days (weeks?) learning the instruction set and programming procedures is better than 5 cheap parts assembled in half an hour?

John

Mr. John Larkin wrote in :

Absolutely true. Sure, you and your thousands of $$$ oscilloscopes, and as an other extravagant femto-second sniffing equipment collector, know that, more then anyone here, in these use-a-net news-groupies.

If you are in New York, and somebody ask the way to San Francisco, and proposes he takes a bike there, you suggest a train or plane, or greyhound, or something more practical. In the end he will save time, energy, and be ready for the next challenge.

You, as the world's most perfect asm programmer know that of course.

You also know digital is the solution to everything, and will completely replace anal-ogical circuits. Even the HiFi amplifiers these days do class D with the Philips patent, at less then 10% distortion. No audio reaches the ear without having passed through a binary process, same for the teevee in a few month.

Even the money is digital, in fact analog is dead. Resistors and capacitators will disappear from the earth, like the dinosaurs. And only small PIC DIL chips will rule the earth. Not even a 68XXXX professor will be seen, all antique stuff. And all programmed in asm or C.

We need to educate, the poor poster needs better solution, remember he already has something, this gives him time to learn asm programming, the extra sales will stimulate the US industry, and may even stop the recession, if not WW3 will take care of that. And WW3 will only be digital. All about digital, from the cruise missiles to the control centres where the ICBMs are launched. And that is only the beginning.

But you don't need to think if you use a PIC ;-)

...Jim Thompson

Oh. Do I have to give all the money back?

John

John

PIC Hammer is an AIOE jerk. 'Nuff said.

...Jim Thompson

In article , To-Email- snipped-for-privacy@My-Web-Site.com says...>

If the solution is a PIC, the question is so simple one needn't think. ...not that that is all bad. Hammer obviously can't; that is.

He does bring up the perennial "analog is dead" argument, admittedly in an incoherent way.

Keep believing that, world! There are still some things I need to buy.

John

In article , snipped-for-privacy@highNOTlandTHIStechnologyPART.com says...>

As everyone knows, analog has been dead for thirty years. Your banker just hasn't gotten the news yet. ;-)

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On a sunny day (Tue, 24 Feb 2009 08:48:06 -0700) it happened Jim Thompson wrote in :

Yea, that is why Jim asked here a shot time ago how long it would take him to learn to program a micro controller.

Sign of times, I am sure the industry your work for must have wondered if not more could be done with less using programmable logic.

The stories of replacing a micro with ADCs - DAC by a resistor summing network are old.. Maybe indeed 30 years old. Think about it ;-)

On a sunny day (Tue, 24 Feb 2009 08:09:34 -0800) it happened John Larkin wrote in :

What money? -:)

On a sunny day (Tue, 24 Feb 2009 10:16:06 -0600) it happened krw wrote in :

Do not creep up to Larkin, he is a perfect programmer. Now figure that one out with your thinking capabilities.

On a sunny day (Tue, 24 Feb 2009 10:43:00 -0600) it happened John Fields wrote in :

switch ---- PIC 12FXX --- MOSFET --- relay. | /// capacitator | ///