Ronnie Walker (aka gpssonar) Replication
Started by unknown · · 55 posts · last reply 5 May 2016
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#51 ·
PLL is just a tool, it locks to the signal that is fed, like you and others know.
The trick is to provide conditions to feed only this signal when this condition occurs.
Sebosfato this is what i am talking about:
(http://www.circuitstoday.com/wp-content/uploads/2009/09/741-IC-Non-Inverting-Comparator-Circuit.jpg) -
#52 ·
right i think of this too
i have found that it locks at certain frequencies of the gate and at certain duty cycle... when gating of course..
the pll can follow a frequency.. .i used it to make a sweep changing a coil parameter... it follows briliantly
it maintain the circuit tuned at the highest possible voltage as you change the coils
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#53 ·
My thoughts is that is inverting instead of non-inverting one on the example.
It work also to "transform" the sine wave or half sine wave from feedback into perfect square wave due to the action of this two diodes,
and gives some gain.
PLL will see always the same signal amplitude, square wave pulses of good quality. -
#54 ·
Bravo!
exactly that, the point is that one of the diode is constantly reversed biased by the 100kohm and 5v and ground.. this makes the opamp stay shut on low signal....
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#55 ·
here in attachment is one example of it... however instead of capacitors i use coils... the capacitors can be selected thru a switch or a resistor... but in my case coils work better
the capacitors are theoreticaly better at lower frequency... but will unavoidably become part of the resonant circuit,,,
again the 5v impeed anyhigh voltage to influx to the opamp...
you posted a 741 which is very slow for the task...
(http://www.ionizationx.com/index.php?action=dlattach;topic=3096.0;attach=14677)attachment_14677 Captura de Tela 2016-01-20 às 13.33.36 (1).png
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