556 dual timer problem

=20

=20

=20

Think carefully about the device and its properties. A cap or two should solve this. And maybe a resistor; depending on the topology of the existing circuit.

Grise

well

thing

fact

other,

micro.

PKB

Grise

Grise

well

some

more

or

and

hardware in it,

way) re-use much of the code.

programming.

possible.

you.

Hey, i can buy nice dev kit for about $150; that is like an hour or so of chargeable time. I work equally well in asm, C or basic. And once you do asm startup code; asm is often is an easy as C or basic or any other language.

somewhere.

But the Fed doesn't have *any* printing presses. ;-)

stuffed somewhere.

How do you get that. Most money is electronic anyway.

OK, then, under whose jurisdiction is the Bureau of Printing and Engraving?

OK, OK, it's not the Federal Reserve Bank, but it's still under the purview of the Fed. Gov't. ;-)

Cheers! Rich

Treasury.

In theory, not so much. The Fed certainly doesn't report to Treasury. Money >> paper+ink

I wonder what China is going to do when they figure out that the dollars they're being paid back with are worth only half what the dollars they lent were worth?

Thanks, Rich

stuffed somewhere.

..then where are those "extra" twenty (or so) trillion dollars coming from?

Would be much better if a bunch of drunken sailors were running the government...

I was kinda talking about the $37 trillion deficit.

Thanks, Rich

Either way, we're going to have a whopping hangover.

stuffed somewhere.

They aren't being printed. It doesn't take a printing press to make bits.

That's alright. Half the s*it they've sold us wasn't worth anything either.

China's got little to do with that. They've pretty much financed the stuff they've sold us (balanced the balance of trade with loans, give or take).

I'm sure they have already figured that out. Most likely products currently made, have their obsolescent / defect alarm calendar set back to a much sooner date!

People, can we say, BAD CAPS, once again!

Good for the business! :-p

Several people have suggested using a PIC. One reason I chose the 556 timer is its wide supply voltage range. In this case, the motorcycle battery voltage is just 6V and the 556 can be operated directly from it. Looking at the data sheets, it seems typical PICS will work only up to

Cheers

Ian

On a sunny day (Tue, 08 Dec 2009 13:46:23 +0000) it happened Ian Bell wrote in :

It is very dagnerous to run _any_ micro directly fro ma car or motorcycle battery. All sort of spikes may happen ,and a much higher voltage then 6 (in this case) can exists during charging. Your 556 or PIC will die. maybe the simplest is a 4.7V zener, with a tantalum cap of about 10uF parallel.

As 'PIC' uses no current to speak of, R 1 can be selected to limit current in case of a high voltage on the input. Of course other parts of teh cicuit can use some current, but a few hundred Ohm will limit surges, if the max I i nteh zener for it to stay below 5.5V to protect the circuit behind it is say 100mA, then, if your battery surges to 20 V yo uhave aboyut 15 V over R1, at 100mA makes

On a sunny day (Tue, 08 Dec 2009 13:46:23 +0000) it happened Ian Bell wrote in :

It is very dagnerous to run _any_ micro directly fro ma car or motorcycle battery. All sort of spikes may happen ,and a much higher voltage then 6 (in this case) can exists during charging. Your 556 or PIC will die. maybe the simplest is a 4.7V zener, with a tantalum cap of about 10uF parallel.

As 'PIC' uses no current to speak of, R1 can be selected to limit current in case of a high voltage on the input. Of course other parts of the cicuit can use some current, but a few hundred Ohm will limit surges, if the max I in the zener for it to stay below 5.5V to protect the circuit behind it is say 100mA, then, if your battery surges to 20 V, you have about 15 V over R1, at 100mA makes 150 Ohm for R1. All depends on the load.