krogersaurus
New Member
Ok, so I've been reading my "electronics for dummies" book for a while and I just finished
Reading all about IC's. I have been especially interested in the 555 timer. I read about how to make a certain circuit called an "astable multivibrator". From what the book tells me, by
Setting up the circuit, I can create square waves that come out of the 3rd pin on the 555. TheBook included a formula on how to find how long the high and low parts of the wave. using my mathematical genius, I determined how to make a square wave which had a high part that would go for about 600 seconds, and a low part of about 300 seconds (so, it completes a cycle every 15 minutes). The timer was created to set off one of those annoying cards that sing every 15 minutes. I would love to hook the output up to the card directly, but the problem is that I am using a 9V battery for the circuit with the 555, and 9V would completely fry the card. So, instead I decided that I would just put the card and its battery (3V) on one open circuit that would set off the card if it were closed, and the 555 astable multivibrator on another circuit that has the output connecting to the ground, which is in this case the (-) terminal of the 9v battery. Is there some mystical device I could put into the set of circuits so that it would close a switch when current runs through another part of it. Like an IC with 4 pins, and the 1st pin connected to the output of the 555 and the 2nd pin connected to the (-) terminal of the 9V battery. Then the other two pins act like a push-button switch, except without the "push-button" part, and the switch closes to complete the circuit with the card.
Does this exist? Is there another way of doing this? Am I making any sense at all?!?
please help me...
Reading all about IC's. I have been especially interested in the 555 timer. I read about how to make a certain circuit called an "astable multivibrator". From what the book tells me, by
Setting up the circuit, I can create square waves that come out of the 3rd pin on the 555. TheBook included a formula on how to find how long the high and low parts of the wave. using my mathematical genius, I determined how to make a square wave which had a high part that would go for about 600 seconds, and a low part of about 300 seconds (so, it completes a cycle every 15 minutes). The timer was created to set off one of those annoying cards that sing every 15 minutes. I would love to hook the output up to the card directly, but the problem is that I am using a 9V battery for the circuit with the 555, and 9V would completely fry the card. So, instead I decided that I would just put the card and its battery (3V) on one open circuit that would set off the card if it were closed, and the 555 astable multivibrator on another circuit that has the output connecting to the ground, which is in this case the (-) terminal of the 9v battery. Is there some mystical device I could put into the set of circuits so that it would close a switch when current runs through another part of it. Like an IC with 4 pins, and the 1st pin connected to the output of the 555 and the 2nd pin connected to the (-) terminal of the 9V battery. Then the other two pins act like a push-button switch, except without the "push-button" part, and the switch closes to complete the circuit with the card.
Does this exist? Is there another way of doing this? Am I making any sense at all?!?
please help me...