Lobo VLF Final

I am finally making a updated parts list for my part time "weekend only" project . I just started and noticed R17 , R19, R20 should be 21.2 k-ohm . For Q2,Q3,Q4 I will use 2n4393 .

And I do see the strange 1R in a few places that are not on the schematic .
I am just starting this Lobo Hobby project today and it will be a few weeks or more to finish .
I am at a slow pace , no hurry but 100% accurate . Quality not Quantity !!   

HH......... .......Eugene

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I am using this image here :

But it is fuzzy on the forum after it is attached because they label it and size it as a thumbnail  

No offense , just proving a point !!  

Posted on: January 27, 2012, 09:12:43 PM

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I have my sprint "Gerber pcb file" ready to export to vendor .

And just finishing up the parts list on wordpad !!! I did notice some differences on resistance values from W. Lahr's drawing compared to other schematics . Below are the sprint image of the through hole boards I am ordering :

Notes: On the recieve 1st stage op-amp I noticed a possible resistance error between pin1 and pin6 which could overdrive the 1st op-amp . Also , yes as suspected there are small capacitors [RC] inside the elliptical search coil used for the Lobo . I'll post the parts list in just a little bit .


HH................Eugene

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We will base it on that , to a certain degree !! His schematic is close but revisions were made after 1989 . Some values of components are different of course .

Here is a parts list , search coil data and some old notes I saved from a Russian site which copied from an English site ?   

The parts list I made today is not final until this project is completed !!


HH...............Eugene

Posted on: January 29, 2012, 02:47:43 AM

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I will be updating the Integrated Circuit list next and working on the capacitor types .


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What is the OP07 about?

2N4393 is found.   Looking into J102 and alternate.

Some of the R values are ODD Balls .    Sorta hard to find.    May have to hand pick them from lots.

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The Lobo VLF Final [download files] back on page one of this topic will be updated because the schematic and pcb layout has errors  . So the Lobo Project is not final yet !!   

HH................Eugene

Posted on: January 31, 2012, 07:17:39 PM

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Here is the latest top-side Lobo board image !!  Not final yet .

Work done by Technician Legaucho .

I always like to give credit to the Tech. who did the work .

HH..............Eugene



Posted on: February 11, 2012, 02:22:15 PM

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The quote button is not working like it used to . The modify button makes two posts merge into one !!
So today is Saturday February 11th and the last image [I posted today] of the Lobo should have today's date of 02-11-2012 !!!

Posting on this forum works good if you learn all the LOOP-HOLES !!!   

HH..............Eugene

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