I built a simple crystal controlled oscillator using the 555 circuit for aligning vintage radio IF stages. The square waves excite the IF transformers and they produced beautifully proportioned sine waves , good enough to do a clean sweep alignment or just the simple peak alignment tuning using a scope to monitor peak amplitude values.
Hello from London, another fantastic lesson, thanks for teaching all the pupils and sharing your amazing teaching. My nephews have been watching and learning from you. I'm not a student but a primary teacher. I've also started teaching my pupils on RUclips during lockdown.
Exellant explaining. And yr accent / tone is classic informative / fresh. I gather i can put transistor to switch power using the entire circuit as a regulator - so when solar voltage goes up the freaquency goes down thus voltage stays where you want it. Thanks.
Thanks for sharing, I was using the 555 a little bit different, basically I normally don't use the pin 5 and only have a decoupling cap on that to ground. I didn't know that the frequencies you get out of the 555 timer this way has such a wide range. I made myself a crude function generator using a couple 555 timers, a few transistors, some opamps and a bunch of diodes and resistors and hey presto I got myself a simple function generator, fully analog and still capable of producing a wide variety of different looking waves. I'm even working on a little add-on so I can use it to match transistors using the function generator and my oscilloscope in the XY mode as a curve tracer, I love the analog stuff, it's more of a challenge but eventually when it all works it will keep working for a long time before it needs some TLC. My question is what's the lowest frequency you can get with this circuit and the highest frequency when you only change the two resistors R3 and R4?
I'm not clear on if you measure Vs or simply calculate it in the table at 09:30. It seems the latter. But R3 and R4 are in parallel with the internal 5 k ohm resistors of the 555. R3 with two of them (so in parallel with 10k), and R4 with one 5k ohm, affecting the voltage Vs. Not that it changes anything in the video, there's still a frequency jump at the 3rd last step (In short. Managed to delete my comment)
It means the voltage control amplifies the signal output? If you change the capacitor into variable capacitor connected to the Trigger pin, you will have Frequency changes?
I have an arcade button as a kill switch on my guitar. Could this circuit be used to turm it into a rapid fire mod? The guitar itself has no voltage so I know Id have to power it with a battery.
Look at the formular for frequency, R4 is indirectly proportional to the frequency, and when you change the value of R4,Va value is affected,so that's how frequency relate to Va
I don’t know about anyone else. I have my timer running at 2.3v input. And these octave changes are .1v. It’s only drawing .050A at startup then settles to .004A I’m trying to get a frequency
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I built a simple crystal controlled oscillator using the 555 circuit for aligning vintage radio IF stages. The square waves excite the IF transformers and they produced beautifully proportioned sine waves , good enough to do a clean sweep alignment or just the simple peak alignment tuning using a scope to monitor peak amplitude values.
Hello from London, another fantastic lesson, thanks for teaching all the pupils and sharing your amazing teaching. My nephews have been watching and learning from you. I'm not a student but a primary teacher. I've also started teaching my pupils on RUclips during lockdown.
Yes, I learned so much from your lessons, I could have failed if not watched your lessons. Thanks so much, you are just God Gifted teacher.
Exellant explaining. And yr accent / tone is classic informative / fresh. I gather i can put transistor to switch power using the entire circuit as a regulator - so when solar voltage goes up the freaquency goes down thus voltage stays where you want it. Thanks.
Very well explained. I've just built one circuit with a 555, but with pwm control, from now on I'll try to add a freq control to it. Thank you a lot.
Most helpful video for 555 ic
Thanks for sharing, I was using the 555 a little bit different, basically I normally don't use the pin 5 and only have a decoupling cap on that to ground. I didn't know that the frequencies you get out of the 555 timer this way has such a wide range.
I made myself a crude function generator using a couple 555 timers, a few transistors, some opamps and a bunch of diodes and resistors and hey presto I got myself a simple function generator, fully analog and still capable of producing a wide variety of different looking waves.
I'm even working on a little add-on so I can use it to match transistors using the function generator and my oscilloscope in the XY mode as a curve tracer, I love the analog stuff, it's more of a challenge but eventually when it all works it will keep working for a long time before it needs some TLC.
My question is what's the lowest frequency you can get with this circuit and the highest frequency when you only change the two resistors R3 and R4?
I was hopping to find this... you really save me
Buena tarde, excelente explicación y muy práctico.
Perfect explanation
Good for pwm motor control also.
Thank you Sir!
Very, very good video on the 555 timer, just an ex job...
What is the difference between control voltage to the trigger pin?
How do you calculate the frequency when the control voltage is plugged in with the formula?
Well, all you need is to use a math methode to calculate the unknown value, once you have those known ones.
I'm not clear on if you measure Vs or simply calculate it in the table at 09:30. It seems the latter.
But R3 and R4 are in parallel with the internal 5 k ohm resistors of the 555. R3 with two of them (so in parallel with 10k), and R4 with one 5k ohm, affecting the voltage Vs.
Not that it changes anything in the video, there's still a frequency jump at the 3rd last step
(In short. Managed to delete my comment)
YES LIFESAVER
thank u
It means the voltage control amplifies the signal output?
If you change the capacitor into variable capacitor connected to the Trigger pin, you will have Frequency changes?
I have an arcade button as a kill switch on my guitar. Could this circuit be used to turm it into a rapid fire mod? The guitar itself has no voltage so I know Id have to power it with a battery.
is the circle in the downer area a - supply?
Hello, should the C1 must be electrolitic or can I use normal plastic or ceramic cap which have no polarity?
idk. i think either one tho
Good tiching karte hai
Kya re, spelling toh thik karke likh ya fir mat likh
Hello from INDIA, how can you relate frequency out with Va? Can you justify?
Look at the formular for frequency, R4 is indirectly proportional to the frequency, and when you change the value of R4,Va value is affected,so that's how frequency relate to Va
I don’t know about anyone else. I have my timer running at 2.3v input. And these octave changes are .1v. It’s only drawing .050A at startup then settles to .004A I’m trying to get a frequency
Can I achieve buck - boost converter through this?
Of course
But it's not a 50on/50off square wave right? Isn't it like a 66/33 or some weirdo in between like 66% duty cycle?
why asking so much question from @ The Organic Chemistry Tutor calculate your self please he given idea
Not a square wave and wrong values ... you can make a better circuit simply with some transistors :/