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Relays are inductive, and big relays can draw up to a amp, how big is the relay?b1mmuo27 said:The output current only pulses the coil on the latching relay which in turn opens the contacts in the relay. So current is really low. The load is not inductive.
Well don't use it then.b1mmuo27 said:I think we are still not talking the same thing. I don't need a 5 second output.
b1mmuo27 said:What I HAVE is a one second input to start this timer. Kinda like dominoes. The input pulse of 1 second which I supply starts the internal clock counting to 5 seconds. After the 5 seconds the timer spits out a +12vdc pulse of 1 second. That's it. Job over. It waits until it gets another +12vdc 1 second pulse & then it starts over again. Kinda like tag. I touch you, you count to 5 & touch someone else. The one second pulse I supply to start the counter would go directly to the relay coil. All I am trying to do is delay that pulse for 5 seconds & then apply it to the coil.
Now I have checked this circuit over & over & I have voltage at both A & B without the 12 volt pulse inputting the transistor. So I have no delay or timer. The 0 line actually has the same voltage as the 12 volt line. I have checked the transistor & it's switching ok. I hope this clears up acouple of things.
No, it isn't an oscillator, it's a monostable, an oscillator is astable, there's no such thing as a monostable oscillator!b1mmuo27 said:As for the circuit if I understand it correctly is this not an monostable oscillator circuit?,
That's exactly what is does!b1mmuo27 said:with an off/on/off time? After the 12v pulses the tranisistor I need the circuit timer to count 5 seconds before it does anything. After five seconds I need it give me a 1 second pulse of 12 v. That's it.
No, your understanding of the circuit seems to be the problem. I understand you perfectly, on a 12V trigger pulse you want it to wait for 5 seconds then provide a 12V pulse for 1 second, it alreadey does this, would you like to see a simulation?b1mmuo27 said:Understanding seems to be the problem.
Your understanding in electronics is alright though you can always learn more, the fact that you've confused monostable and astable shows you lack the knowledge to understand this circuit.b1mmuo27 said:Your talking apples still & I want an orange. I'm not proficient in electronics but understanding the problem seems to be the problem.
I've given you both, you don't have to use the 5 second delay if you don't need it, just use the one second output, just connect the relay to output B.b1mmuo27 said:You gave me a 5 second 12 volt ouput. Thanks but that's not want I wanted. I did want the 12 volt 1 secondput though. I want a 5 second delayed ouput.
Connect the to the negitive (-) terminal of the battery, 0V is just a referance from where all voltages are measured from.b1mmuo27 said:Two more questions Hero999. As I can't seem to wrap my head back on electronics & keep thinking electrical is your 0 volt line the same as battery ground?
The 556 is simply two 555s in one package, because of this the pin numbers are slightly different and they share common Vcc and 0V pins, look at the pinouts for the 555 and 556 you should be able to figure it out for yourself.b1mmuo27 said:I also picked up a 556 & wondered what thie drawing would look like using it. Thanks.