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Registered Member #1509
Joined: Thu May 29 2008, 05:53AM
Location:
Posts: 7
I am currently doing a project of the musical solid state tesla coil. I am now building the PLL circuit, but I have found some problems during the circuit testing on the two PLL circuits from these two great people's work:
Website: Schametic:
Website: Schametic:
I am testing the PLL part on the breadboard, I found that the output frequency of PLL does not vary according to the input frequency, I tried to input different frequency to the PLL from a function generator, but the PLL keeps to output the same frequency throughout the process. It completely ignored the input signal (it's kind of doing it's own business).
That VCO output frequency is the same as when there's no signal input to the PLL, and it seems to be the centre frequency of the VCO, and I am pretty sure that the input frequency is within the locked range.
I even tried to only tested on the VCO part by grounding all the other inputs, but the output of VCO still doesn't change according to the VCO input frequency.
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
That's funny, Yestarday I also finnished PLL circuit according to this scheme and I run into the same problem. I also tried function generator but could not achive any shift in the output PLL frequency. I will look properly today what could be wrong - maybe I made a bug somewhere...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Locking to a function generator is a totally different problem than tuning a Tesla coil, and needs a different loop filter. So don't be surprised if these circuits won't do it.
I worked through the theory a couple of years back, and I think everyone else just copied my loop filter
Registered Member #1025
Joined: Sun Sept 23 2007, 07:53PM
Location: Czech Rep.
Posts: 566
Dr. Conner wrote ...
Locking to a function generator is a totally different problem than tuning a Tesla coil, and needs a different loop filter.
This makes no sense to me... The output signal from the Smidt trigger connected to the PLL is square regardless what wave shape you send in – or am I wrong? The output from the TC secondary is relatively nice sine wave. The trigger turns it into square which goes right into the PLL - so what filter are you talking about? How should I make all the settings than? Do I really need to connect my TC?
Sorry for all these questions which might seems very stupid for most of you, but I have nobody else to ask…
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PLL WON'T WORK!
