piper91765
New Member
555 timer
How accurate does your pulse need to be? You can get a reasonably accurate 1Hz pulse by using a 555 timer. The best part is that it is simple (no programming required), has few parts, and you could build it for pennies. Check out this link:
You can calculate the pulses using the formulas provided in the document.
t1= 0.693(R1+R2)C
t2= 0.693(R2)(C)
If your pulse is 1Hz, that means one cycle per second; therefore t1=t2= 0.5 seconds
Then just plug in the numbers and solve. Pick a value for R1 and solve simultaniously for R2 and C.
0.5=.693(R1+R2)C
0.5=.693(R2)(C)
Hope that helps.
Btw, for greater accuracy, use a trimmer for R2 and fine tune the circuit until it is exactly 1 Hz
How accurate does your pulse need to be? You can get a reasonably accurate 1Hz pulse by using a 555 timer. The best part is that it is simple (no programming required), has few parts, and you could build it for pennies. Check out this link:
You can calculate the pulses using the formulas provided in the document.
t1= 0.693(R1+R2)C
t2= 0.693(R2)(C)
If your pulse is 1Hz, that means one cycle per second; therefore t1=t2= 0.5 seconds
Then just plug in the numbers and solve. Pick a value for R1 and solve simultaniously for R2 and C.
0.5=.693(R1+R2)C
0.5=.693(R2)(C)
Hope that helps.
Btw, for greater accuracy, use a trimmer for R2 and fine tune the circuit until it is exactly 1 Hz
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