Liberty II circuit

[porkluvr]

Hey fellas I'll leave the Liberty II out on the bench for a few more days if anyone needs me to check any more possible errors.
Best, Phil

It's good to see one of the "big boys" using a plain old RC oscillator instead of the more usual quartz crystal for the frequency standard.

edit: I must be having a bad day. I had posted something about this frequency being all wrong in the simulator. I think I was looking at microseconds display but thinking frequency. Of course that was all wrong. After shaking my head a few times I'm still seeing the tx frequency a little bit low but I think I can live with that.

[Qiaozhi]

Hey fellas I'll leave the Liberty II out on the bench for a few more days if anyone needs me to check any more possible errors.
Best, Phil

One more question ... could you measure the voltage at the 2931 input? Presumably it's somewhere between 9 and 18V.

[turtlebowl]

One more question ... could you measure the voltage at the 2931 input? Presumably it's somewhere between 9 and 18V.

2931 pin 4 input is as you suspected: 16.3vdc

Also in regards your other question on 4024 pins........... the 4.7K is connected to pin 11. You were right there also, there is not of course a second pin 4 connection. A simple error by the scribe.
All other pins look good.
Best, Phil

[Qiaozhi]

2931 pin 4 input is as you suspected: 16.3vdc

Also in regards your other question on 4024 pins........... the 4.7K is connected to pin 11. You were right there also, there is not of course a second pin 4 connection. A simple error by the scribe.
All other pins look good.
Best, Phil

Thanks for your help.

[ivconic]

I made this! But i put 4093 from some scraped device and it is not working.
Later i realized 4093 was bad, burned!
So now i am waiting new one.
But in meantime i wanted to check the rest of electronic, so i "jumped" all the 4093
inputs and outputs and .... IT IS WORKING!
OK, it is working bit funny - but still working!
I tested it with some coil from a workshop; it is detecting metal items, not bad at all.
But because 4093 is removed, it is producing constant tone when there is no detection.
This is promising, i will wait 4093 to get and see...

[ivconic]

pcb...

[WM6]

Great work ivconic and other guys.

Can anyone explain what sort of detector, by purpose, Liberty is? Is this dedicated as coin detector?

[ivconic]

Great work ivconic and other guys.

Can anyone explain what sort of detector, by purpose, Liberty is? Is this dedicated as coin detector?

Look here:
http://www.google.com/url?sa=t&sourc..._5Xgme4wQLlO-g

[ivconic]

As you maybe noticed; it is Liberty Di on the photo and here we are talking about Liberty II.
There are some differences.
Most noticeable is VU scale present on Di version and not on Liberty II.
I believe that there are some minor differences more, but i can't say about those, because i have never seen neither on of Liberty models so far.
Maybe Carl can say something more about it? (considering his splendid collection)
There is one unused 4070 segment on Liberty II version, maybe it is somehow used to drive Vu scale!? (of course, along with some more components..)
But in essence those two versions are most probably the same...least in 95%!

[ivconic]

Is there any chance anyone to know exact Liberty II coil data?

[WM6]

Is there any chance anyone to know exact Liberty II coil data?

Did you read Altras post #14 ?

If Liberty coils are compatible with XLT then we have this data (including TX capacitor):

XLT 9.5"

TX: L=540uH R=1.4 ohms
RX: L=36mH R=122.8 ohms

[ivconic]

Did you read Altras post #14 ?

If Liberty coils are compatible with XLT then we have this data (including TX capacitor):

XLT 9.5"

TX: L=540uH R=1.4 ohms
RX: L=36mH R=122.8 ohms

Yes! I remember it now! It slipped out of my mind somehow!?
Thanks WM6!

[silverdog]

Liberty II

I don't know the specs but the manual says series 2,3 or pro series coils are compatible

[silverdog]

I don't think the XLT coil will work , see below

It seems that a 6B coil as used on the Classics is the one

Older Whites detector coils

On the left mounting tab of the coil, where the rod connects to it is the coil winding designation code. Examples ; 6B , D5 , G , B4 etc.....


D4 and D5 coils were used on the 6000/D and 6/DB detectors only !! These were available in 8 inch and 15 inch.


B4 and B5 coils were used on the 4/DB and 5000/D detectors only !! Available in 8 inch and 15 inch sizes.


6B coils were used on the "series 2" , the "series 3", the PRO units, the Classics, and on the Classic I SL and Classic II SL. The 6B coil sizes were 4 inch, 8 inch, 10 inch and 15 inch.

A "F" coil was made called a Blue Max 256, which was a 10 inch coil to be used on all the detectors that used the 6B coils. It was lighter than the standard 10 inch and was similar in performance to the present 9 1/2 inch coils. This is the ONLY Blue Max coil that you can use on the 6B detectors. All these coils were whites colored with a blue/white decals on the coil.


The present coils, most commonly called the Blue Max coils, used on the XLT, IDX series, PRL-1, Classic III, and Sierra Madre detectors, have the following codes on them ; 8B , G , HI, .

The Blue Max coils are available in these sizes ; 4 inch, 4X6 DD, 6 inch, 8 inch, 9 1/2 inch and 15 inch. They are known as the Blue Max 350, Blue Max 600, Bullseye 5.3, Blue Max 800, Royal 800, Blue Max 7.8, Blue Max 950, Precision Scan 950, and Blue Max 1500 . All these coils are interchangable. Most of these coils are black colored with many different color decals on the coil. They are NOT made to be used on units that take the 6B design !!!! Using these coils in place of the 6B coils will have varying results. The detector will not ground balance properly, DISC settings will be off, and target ID's will not be accurate. Similar problems will result in using the 6B coils on the 8B detectors, even though the connectors will fit on the control box, they are wired differently.

[ivconic]

All checks i done so far - leads me to suspect that TX is low inductance.. far bellow 1mH. Knowing other White's coils; i also think Liberty coil must be similar to BM950 coil, although not sure.