Frequency generator PLL driven with pulse control (Stans VIC)

Steve

#1 · 12 May 2008

From eclipsed78
is here a nice PLL driven circuit.

br
Steve

attachment_1130 stans_working_prototype_pll_edited_189.jpg

Steve

#2 · date not recorded

Found this schematic from some years ago.
Not sure if it works, but it looks ok.

Steve

attachment_6807 Aquos%20Circuit.jpg

sebosfato

#3 · date not recorded

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...

Steve

#4 · date not recorded

Quote from: sebosfato 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...

They all look the same, hahahahahahaha
Thanks man.

Steve

sebosfato

#5 · 7 Mar 2011

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.

sebosfato

#6 · 7 Mar 2011

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.
=)

Alan

#7 · date not recorded

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?

webmug

#8 · date not recorded

Quote from: Alan 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?

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

sebosfato

#9 · date not recorded

The antiparallel diodes limit the voltage to a maximum of 0.7v and the resistors in series limit the current, so you can always get the same signal voltage, than the opamp clean up and amplify and balance the signal so you get a perfect stable and clean square wave signal.. this goes to pin 14 in the pll...

To test it is easy you simply pulse your primary (in saturation) and work in the circuit until you get the right signal for the pin 14...

sebosfato

#10 · date not recorded

attachment_6814 Resonant tank.png

Steve

#11 · date not recorded

another pll schematic

attachment_13783 Lawton_pll.jpg

Steve

#12 · date not recorded

another one

VIC_Circuit_Production_Schematic.pdf VIC_Circuit_Production_Eagle-5.10.0_Files.zip VIC_Circuit_Production.pdf