Author Topic: Frequency generator PLL driven with pulse control (Stans VIC)  (Read 6480 times)

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From eclipsed78
is here a nice PLL driven circuit.

br
Steve

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Re: Frequency generator PLL driven with pulse control (Stans VIC)
« Reply #1 on: March 06, 2011, 17:02:51 pm »
Found this schematic from some years ago.
Not sure if it works, but it looks ok.


Steve

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Re: Frequency generator PLL driven with pulse control (Stans VIC)
« Reply #2 on: March 06, 2011, 18:25:15 pm »
There is an error in this schematic, in the resonant scanning circuit bipolar switches are needed like indicated in the first schematic and the 15 pin of the decade counter must be connected to the ground . The rest is pretty much the same as mine...

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Re: Frequency generator PLL driven with pulse control (Stans VIC)
« Reply #3 on: March 06, 2011, 22:57:15 pm »
There is an error in this schematic, in the resonant scanning circuit bipolar switches are needed like indicated in the first schematic and the 15 pin of the decade counter must be connected to the ground . The rest is pretty much the same as mine...

They all look the same, hahahahahahaha
Thanks man.

Steve

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Re: Frequency generator PLL driven with pulse control (Stans VIC)
« Reply #4 on: March 07, 2011, 02:36:31 am »
I mean the Q8 and Q9 transistors.. hehe  but the first schematic is ok, is the same as mine one, but i tell you that i only found this when i had already solved the pll... so is coincidentally perfectly equal... but I prefer my new one.

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Re: Frequency generator PLL driven with pulse control (Stans VIC)
« Reply #5 on: March 07, 2011, 02:45:39 am »
I'm constructing a new pll witch i'm going to use only high speed 5v htc chips and i'm going to solder the ics directly in the board to minimize the capacitance between the pins. My breadboard worked really strange.. I found that the potentiometer was broken but i decided to construct a soldered circuit cause i'm not sure if the problem was exclusively the potentiometer, i lost a couple of days.. ... The gate circuit i'm going to use the one i already have working... I will put everything in a closed box to act as a faraday cage.. to try have some more stability...


I need to buy some more pieces but i'm out of money and is carnival here all store are closed like in led Zeppelin song. 


I condensed the pll the high speed nor gate the driver the voltage regulators and a frequency divider this board will have 1 potentiometer... It will also have the lock in indicator circuit all in the same board. 


I'm thinking to use a connector where i will connect all the things that interacts with the circuit so i can easily take it out of the box like potentiometers leds inputs and outputs.


Lot of work here soldering... The board is 2inches X two inches.
=)






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Re: Frequency generator PLL driven with pulse control (Stans VIC)
« Reply #6 on: March 07, 2011, 16:59:10 pm »
I don't understand how the pulse indicator works; the signal from the feedback coil is rectified and fed into an opamp, doesn't it just mirror the input signal  into a TTL signal?

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Re: Frequency generator PLL driven with pulse control (Stans VIC)
« Reply #7 on: March 07, 2011, 17:22:18 pm »
I don't understand how the pulse indicator works; the signal from the feedback coil is rectified and fed into an opamp, doesn't it just mirror the input signal  into a TTL signal?
It is basically a clipping circuit connected to a opamp as schmitt trigger, generating TTL pulses.
http://personal.ee.surrey.ac.uk/Personal/H.M/UGLabs/briefs/d1.htm

br,
webmug
« Last Edit: March 07, 2011, 23:16:05 pm by webmug »