Frequency division using a JK flip-flop and frequency multiplication using a phase locked loop.
http://assets.nexperia.com/documents/data-sheet/HEF4027B.pdf
http://assets.nexperia.com/documents/data-sheet/HEF4046B.pdf
http://assets.nexperia.com/documents/data-sheet/HEF4027B.pdf
http://assets.nexperia.com/documents/data-sheet/HEF4046B.pdf
THANKS for the video…I just wanted to comment on the first part where you did a divide by 2 with the flip flop: THE OUTPUT OF THE FLIP FLOP WILL BE 50% DUTY CYCLE, NO MATER WHAT THE 555 DUTY CYCLE IS.
PS:
What does "JK" stand for?
Very good video on the frequency doubling feature of that PLL and that's the tip of the iceberg for how that little jewel can be used.
Very interesting Julian, thank you for this explanation. Do you know what's the best way to divide a 5 GHz frequency so it can be measured by a 100 MHz osciloscope?
hi julian how to do 1.2 times or 1.05 timers of frequency. i wanted use for an encoder 400 hz to make 420 hz
Hello sir thanks your video and documents please help us for phase shift full bridge pwm for battery charger application. Arduino based
Can you design a circuit with varying input frequency to give four times greater output varying frequency?
Now try getting the PLL to work with a non-integer ratio. Maybe a musical interval? Build two of them and you'll have a chord generator… 🙂
Nice video, but it would be nice to say what's the purpose of PLL. You could instead use just higher frequency oscillator instead of trying to double the frequency.If you need 2 frequencies is still the same – use higher frequency oscillator and a divider (because it's easier than multiplying).
Actually, I have seen designs for a frequency multiplier that uses a D flip flop on a PLL. If you're interesting, it's included in the example circuits in Paul Falstad's java circuit simulator, also known as circuitmod for the standalone version.
Great video. Very informative indeed. Would please make a video about creating a sinewave or triangle wave with di
gital chips?
after watching the video, I got inspired and got my hands on these devices. But even after trying to fine tune VCO to lock onto my external clock (15.5KHz from a function generator), I couldnt get it to lock, it always ends up with jitter in the output. I set my offset at 12KHz.
Thank you, I have been struggling to comprehend the calculations in the datasheet for the vfo freq, your video inspired me to just plug it all together and work it out empirically. I now have a nice stable vfo running at the desired freq. Next the low pass filter, I think this s/b a bit easier.
Great Videos Julian. I guess I will; be watching them all now 🙂
You never disconnected the pot from the 4046 VCO input when you added the RC loop filter. Was this intentional?
I liked your videos, even if you had a cheap Owon oscilloscope.
But since you got a very expensive oscilloscope as a gift, and you always brag with it, you lost my sympathy.
If you have such a good oscilloscope at least don't humble down it with 100 kHz projects. Your old Owon is also very good for such projects. Do not brag!
I am sure that noone from your watchers will buy it in the future.
The 4046 is just about available but how about showing how the same functionality/circuit can be realized in a cpld such as an epm3032. I have yet to play with a cpld due to work commitments (though I have a dev board) but this looks like a good project for everyone to learn how to use a cpld without having to go the whole hog with a fpga which I believe is a different kettle of fish.
This seems a complicated way of doing the frequency double. The first hit in google gives.. "Differentiate the square wave, full wave rectify and then pass through a Schmidt trigger". The Schmidt trigger is optional. So a resistor, capacitor and four diodes at it's simplest.
What I like about this video is how there is no automatic reach for a micro controller. As an exercise it can be very educational to take a circuit problem and then use lower and lower tech ways of implementing a solution. Even using no active devices at all.
Did someone forget their new keysight scope review video? Didn't know you owned a scope!