I have a clock (ne555) that has 20% duty dycle and I want to change duty cycle to 50%.I don't want to change the frequency just the duty cycle.The phase mus't change a lot.I can't play with the ne555 because I transmit this frequency and then I want to have this frequency in the receiver but I want it in 50% duty cycle.Also I can't make the same (or a similar) circuit in the receiver because I want to synchronize the two components (frequency drift etc).So the only way is to transmit the frequency.
I have a clock (ne555) that has 20% duty dycle and I want to change duty cycle to 50%.I don't want to change the frequency just the duty cycle.The phase mus't change a lot.I can't play with the ne555 because I transmit this frequency and then I want to have this frequency in the receiver but I want it in 50% duty cycle.Also I can't make the same (or a similar) circuit in the receiver because I want to synchronize the two components (frequency drift etc).So the only way is to transmit the frequency.
He wants a fixed frequency but wants a 50% duty-cycle.
Then maybe a CD4047 IC should be used. It has an oscillator with one resistor and oune capacitor. It has a digital divide-by-two to give a perfect 50% duty cycle. It has two outputs with one inverted if it is needed.
He wants a fixed frequency but wants a 50% duty-cycle.
Then maybe a CD4047 IC should be used. It has an oscillator with one resistor and oune capacitor. It has a digital divide-by-two to give a perfect 50% duty cycle. It has two outputs with one inverter if it is needed.
Sorry for not answering I had a problem but I am back.
I know how to make a 50% duty cycle squeare signla (with a crystal for example) but i want to transmit this frequency in 20% duty cycle and the i want to take this frequency in the receiver and change it to 50% duty cycle but i want the frequency remains the same and of cource not a big chane in the phase.The frequency doen't change (150Hrez).Imagine that someone gives you a frequency in a wire and he tells you that i have a 150Hz frequency in 20% duty cycle and i want an electronic component that in the input it takes the frequency i give you and in the output i take the same frequency but in 50% duty cyle and of cource without a big change in the phase.Thanks in advance
I made a photo curtain (this is the name in market). 8 infrared proximity sensors.
The problem is that i want to sychronize them. There are two ways. The first is to connect the emitter and the receiver with a wire. The second is to trassmit the frequency. I know how to transimt the frequency and take it back in the receiver but the problem is that i want it to 50% duty cucle but i have to transmite it to 20%.So i take the frequency but i want to change the duty cyle without a big change in the phase.Sorry for not responding.If you have something in mind please post it.Thanks
He wants a fixed frequency but wants a 50% duty-cycle.
Then maybe a CD4047 IC should be used. It has an oscillator with one resistor and oune capacitor. It has a digital divide-by-two to give a perfect 50% duty cycle. It has two outputs with one inverter if it is needed.
No the frequency remains the same and the duty cycle is 20%.I want to change it in 50%.Not to make the circuit again because i want to transimt the frequency and then to sych
Ok I start to understand. The problem is that I have to make a long transition and I can't have 50% duty cycle in the emitter (too much current).The best I can give for this is 20% or less. I use 4% or 5% duty cycle for the other ireds. I will transmit 300Hz and then I will use a divider but I don't know any circuit: divide by 2 bistable. So if you know any circuit or an IC that does this work I will be glad. Thank you
How precise and accurate does the 50% duty cycle have be? I don't recall you saying. If the frequency is unchanging, how about a monostable with a period of 1/2 the period of your transmit frequency, triggered by the leading edge of your 20% pulse. 3.33333mS for your 150Hz frequency signal.
How precise and accurate does the 50% duty cycle have be? I don't recall you saying. If the frequency is unchanging, how about a monostable with a period of 1/2 the period of your transmit frequency, triggered by the leading edge of your 20% pulse. 3.33333mS for your 150Hz frequency signal.
I use a simple ired that I transit the fisrst signal and then I use the TSOP2240 to take it back see second signal.So I have to send it in duty cycle 20% and take it in duct cycle 80%.But for the synch I need the same frequency I transmit (or the divided frequency by a factor) but in 50% duty cycle.