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How to construct a PWM circuit using 2 Timer 555
- Thread starter cloud623
- Start date
How about PWM with a single 555? If you use a 5V supply, I would recommend replacing the MOSFET with one specified for 5V logic level gate drive.
thingmaker3
- Joined May 16, 2005
- 5,083
Perhaps you should begin by familiarizing yourself with the 555: http://www.uoguelph.ca/~antoon/gadgets/555/555.html
thanks a lots u 2 guys. but i mean one 555 is as a Voltage-controlled oscillator, another one is PWM 555. so refer below i attached Voltage-controlled oscillator 555 and other 2 PWM 555. How to combine can be adjust the pulse width by using voltage control.
Attachments
If you want variable frequency, and variable duty ccle, and you want them to be independent of each other (duty cycle doesn't change when you change frequency), I don't think you can do it with a couple of 555s. Maybe not even with 100 555s.
You can do it with some other parts, though.
You can do it with some other parts, though.The first circuit I posted does that with one CMOS 555.
Pin 7 is not needed. Leave it disconnected.
That's what the schematic shows.
I'm not sure, that's a tough one ... but you might look in the vicinity of the note which reads "CHANGE THIS CAP FOR PWM FREQUENCY"
(hint: .047uF)
Why are you wasting days asking pointless questions? I posted the schematic 10 days ago. You could have built it and tried it out in a few minutes.
If you are reluctant to order parts until you are sure it will work, then tell us that. As you can see, we're starting to get annoyed (or at least I am).
If you are reluctant to order parts until you are sure it will work, then tell us that. As you can see, we're starting to get annoyed (or at least I am).
And if you don't have the parts, or the test equipment needed, you could at least download the LTspice circuit simulator from http://www.linear.com and test the circuit that way. You can change component values and see whatever waveforms you want, etc etc.
