Liberty II circuit

[turtlebowl]

I need a Liberty II circuit drawing. Anyone?? Will Pay if needed.

[amtech2005]

Hello Turtlebowl . I will post the schematic . Can you please post a clear photo of the Liberty II circuit board and wiring, top and bottom ?

Best Regards...........Eugene

[turtlebowl]

LibertyII Pictures and Schematic

Thanks Eugene for agreeing to share the schematic!! Here are the pictures to go with it.
Looking forward to your post. Phil

[amtech2005]

Here is Liberty II sch. Thank you Phil for posting your beautiful PCB Photo's

Best Regards Again..........Eugene

[turtlebowl]

Thank You Eugene!
A word of caution for anyone new at using pix to perhaps create a similar circuit board. The fellows at Whites were masters at hiding traces under resistors, Chips and component label paint. It is extreemly difficult to follow the traces even with the actual board setting in front of you with this simple looking board. They are that good at their craft.
Best of luck guys, Phil

[lonelyWOLF]

thanks turtlebowl for good photos..

thanks Mr.Eugene for clear schematics..

regards...Dagci,erol.

[Geo]

Here is Liberty II sch. Thank you Phil for posting your beautiful PCB Photo's

Best Regards Again..........Eugene

Hi Eugene.
If i am not wrong, it is another schematic from the Big W. LAHR

Regards

[amtech2005]

Hi Eugene.
If i am not wrong, it is another schematic from the Big W. LAHR

Regards

You are correct again Geo , The great W.L. !!

Best Regards...........Eugene

[Qiaozhi]

Thank You Eugene!
A word of caution for anyone new at using pix to perhaps create a similar circuit board. The fellows at Whites were masters at hiding traces under resistors, Chips and component label paint. It is extreemly difficult to follow the traces even with the actual board setting in front of you with this simple looking board. They are that good at their craft.
Best of luck guys, Phil

There are some definite inconsistencies between the schematic and the layout.
For example, have a look at the LM339 on the left-side of the schematic. Pin 6 is connected directly to pin 3 (VCC). From the top layer you can easily see that the two 22k pullup resistors are indeed connected to pins 1 and 2, and then go to VCC, but there is no connection between VCC and pin 6. I think the confusion has been caused by a stub trace from pin 3 that goes nowhere on the bottom layer (marked in red on attached image). Presumably this means that there are other errors as well.

Turtlebowl - would you be able to check continuity on the PCB to see if there is a connection between pin 6 and VCC, just to double-check this is a mistake?

[turtlebowl]

Corrected drawing

Yes....Nice catch!
The two 22k do in fact go to Vcc. Pin 6 however goes to Vdd as does the .001 cap from pin 4. So Bill just made a small boo boo. He wrote Vcc instead of Vdd and then drew in the 2 x 22k from pins 1 & 2 to what he had written as Vcc.
A quick scouting of the immediate area revealed no other mistakes.
Clear as mud??
For clairity let me state it another way.
On the drawing scratch out both Vdd at LM339 and re-write as Vcc.
Erase both 22K from pins 1 & 2.
Re-draw the two resistors in series connecting pins 1 & 2.
At the juncture of the two resistors write Vcc.

I don't have MS paint on my laptop or I would re-post the corrected drawing, sorry.
Have a spendid day gents.
Phil

[Qiaozhi]

Thanks!

[Qiaozhi]

Updated schematic.

Here is a contribution from our friend Ivconic, who has kindly updated the schematic and provided a copy in both jpg and ExpressSCH formats.
Be aware that there may be other discrepancies between the schematic and the PCB. If anyone spots an error, then please post them here.
In particular, have a look at the 4024 pin numbering. In the original schematic it looks like there are two pin 4s ... or is one them pin 11 (or 9)?

[turtlebowl]

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

[Altra]

Thanks Ivconic and Turtle!

For people wanting to build this in the future. You need to have a 1uF capacitor in parallel with the TX coil. Not shown on either schematic. Unless you are using an original factory coil which has one built in. XLT coils will work on this design.

Regards Mark

[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

Hi Phil,

Please could you have a look at the 4025 pin numbering? Something is not right there.