Author Topic: My pll circuit  (Read 25969 times)

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Re: My pll circuit
« Reply #80 on: October 06, 2012, 19:25:04 pm »
It was just a thought i had here... i'm finishing my first box here can't wait anymore for testing it...

Looking forward to your report.

TS

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Re: My pll circuit
« Reply #81 on: October 07, 2012, 18:31:32 pm »
while working with the scanning circuit i found why the lock in led blinks or what it causes...

when this happens the scanning circuit will be trigered by a false lock so the vco receives a pulsing not a stable voltage so the duty cycle output of the signal get distorted... with no signal on in put...

This is only avoided by adding even more capacitance to the lock in circuit.


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Re: My pll circuit
« Reply #82 on: October 08, 2012, 16:26:33 pm »
I think i found a better usage for the 4way switches i hawe here...

My one here has 3 sets of 4 position meaning i can use 3 different functions for it to switch at the same time....

For example i could use a different capacitor for the lock in for each frequency range and so on...adding a led to indicate what range it is  being used..

or the filter capacitor...

I plan to use this two first for now... 

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Re: My pll circuit
« Reply #83 on: October 08, 2012, 18:58:36 pm »
Today it didn't acted that funny...

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Re: My pll circuit
« Reply #84 on: October 17, 2012, 03:14:29 am »
I found that the osc on led act wrong when gating 100% some times it stay light and some times low because the counter won't finish aways at low logic. So i added a modification to the circuit of the led using the gate signal from pin 5 and another transistor shorting the base of the led transistor to ground, so now it show properly if there is or not signal going out...


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Re: My pll circuit
« Reply #85 on: October 17, 2012, 03:21:45 am »
My box is now ready for testing it is really stable... also my new H bridge circuit output also works perfectly... It came out better than i expected but not as cool as the new ones upcoming...

Finally something that still works after drop it on the ground.

I'm going to start testing now!








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Re: My pll circuit
« Reply #86 on: October 17, 2012, 13:31:05 pm »
My box is now ready for testing it is really stable... also my new H bridge circuit output also works perfectly... It came out better than i expected but not as cool as the new ones upcoming...

Finally something that still works after drop it on the ground.

I'm going to start testing now!

I only drop my wife on the ground from time to time...   ;D ;D ;D ;D ;D

I know. This post is not exactly high tech quality, but heeeeeeeeeeeeeee...... i worked my bud off to get the forum all working again!

 8) 8) 8) 8) 8) 8) 8) 8) 8) 8)

Mr. Sebosfato Meyer!





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Re: My pll circuit
« Reply #87 on: October 17, 2012, 13:36:33 pm »
It generates frequency within the following ranges

1,6khz up to 19khz manually (fine tune) or auto tuning when R2 is maximum

16khz to 25khz when R2 set to min...

the bandwidth can be narrower for example going from 1,4khz up to 10khz than from 16-20kz .... raising R1

so scanning occurs within this bandwidths and intermediates config of R2 pot

also divided by 10, 100 and 1000 

so the led bliks at 1hz up to 25 hz

the gate goes from 0,5 hz up to 6,5khz approximately
0,5- 6 hz
5,6-65 hz
56-650 hz
560-6500hz

the scan circuit auto mode runs at 0,7hz scanning the all bandwidth within each half period.