| Electronics > Projects, Designs, and Technical Stuff |
| IC advice to create a regolable oscillator from 0 to 500kHz |
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| Zero999:
--- Quote from: ogden on April 01, 2019, 01:10:28 pm ---To get 50% duty cycle, build 0..1MHz clock and divide it by two: https://www.electronics-tutorials.ws/counter/count_1.html --- End quote --- That's what the circuit I posted above does, but the original poster appears to lack confidence in it, because it doesn't work with a simulation program. There are lots of circuits like that which won't work in simulation very well. What's worse is there are circuits which will work in a simulator, but not in real life. Here's an example of a circuit which is supposed to both generate an inverting and non-inverting output, with a gain of 10. A simulator will show it works, but it doesn't in real life, |
| Kleinstein:
The 74HC4060 could be suitable. A simple RC oscillator that could be adjusted with a pot, and quite a few divider stages to select for the lower frequency. because it's a ripple counter the outputs are near perfect 50% PWM. The stability is not great, but could be a little better than HC14 type. As the analog range would be only about 1:4 the adjustment could be relatively fine. Overall range could be something like 1 MHz .... 1 Hz or a little larger. |
| Yaroooo:
--- Quote from: Zero999 on April 01, 2019, 04:21:03 pm --- --- Quote from: ogden on April 01, 2019, 01:10:28 pm ---To get 50% duty cycle, build 0..1MHz clock and divide it by two: https://www.electronics-tutorials.ws/counter/count_1.html --- End quote --- That's what the circuit I posted above does, but the original poster appears to lack confidence in it, because it doesn't work with a simulation program. --- End quote --- No wait. I've just asked to learning purposes. What I've asked is why is not working and I can't simulate it, to understand what's happening. But I had interesting answers to make me understand better. |
| iMo:
If you want to learn something useful, download the LTspice and you will get a tool which works.. |
| Zero999:
--- Quote from: imo on April 02, 2019, 07:50:41 am ---If you want to learn something useful, download the LTspice and you will get a tool which works.. --- End quote --- Does the astable with the 74HC74 work though? --- Quote from: Yaroooo on April 02, 2019, 07:29:43 am --- --- Quote from: Zero999 on April 01, 2019, 04:21:03 pm --- --- Quote from: ogden on April 01, 2019, 01:10:28 pm ---To get 50% duty cycle, build 0..1MHz clock and divide it by two: https://www.electronics-tutorials.ws/counter/count_1.html --- End quote --- That's what the circuit I posted above does, but the original poster appears to lack confidence in it, because it doesn't work with a simulation program. --- End quote --- No wait. I've just asked to learning purposes. What I've asked is why is not working and I can't simulate it, to understand what's happening. But I had interesting answers to make me understand better. --- End quote --- Oh did you try building it and it didn't work? If the 74HC74 didn't work, try the CD4013, I've build it with that IC and it worked perfectly. I didn't try the 74HC74, although it should work with that too. The link you posted to the simulation doesn't work. Try [url]link[/url] |
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