modified PLL ckt with indicator

182

02:44:59

pll ckt to make phase difference zero bt two waves
activate the input signal by closing switch,then watch how they get zero phase difference.I put an indicator ckt to show a light only if it is that the zero phase difference is occured.LED will not be lit if the input signals is off or the two waves are not the same phase.you can change the signal frequency by varying C at the signal oscillator.

published 10 years ago

kmo

10 years ago

nice ckt right

hurz

10 years ago

Replace the 1uF cap at pin 5 of 555 with a 1kOhm and its working more or less.

ferlop

10 years ago

I tried it and found out that it does not phase lock, either with the capacitor or the resistor.

ferlop

10 years ago

Increase the capacitance of the capacitor from the 5K resistor to ground to 2uf, and exchange the other 1uf capacitor from pin 5 for a 1k resistor, watch the output of the and gate as well as the other two waves and it phase locks right in.

hurz

10 years ago

@ferlop, Dont know what you have tested but replace the cap with a 1k resistor works still fine.

ferlop

10 years ago

@hurz, it didn't work with or without the change of cap for resistor the first time I tried, but it is working now, it gets frustrating some times when things don't work right in EC.

hurz

10 years ago

Probably you also tuned the cap up or down while sim was running, this cause a voltage change! Anyway...

hurz

10 years ago

@kmo, now with your latest midification the circuit is boring, cuz both oscillators are equal in freerunning frequency! It would be more fun as you started with different frequencies as startconditions.

kmo

10 years ago

@hurz,I think you have read my description,so you misunderstanding something,this is phase locking ckt . Caz I am not a genius or pro , i cannot explain very well .Thus all i get .thank u for your attention at my circuitry

hurz

10 years ago

Make the left oscillator cap 80.1nF and you will see its not working, cuz the control voltage is differential and will sooner or later drop to zero and cant follow the phase error. The cap has to be changed to a resistor to constantly correct the phaseerror. Just my 2cents of PLL design.

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.