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Very interesting link Ivconic has done a great job. Think I will stick with standard setup for now. MinLab coils aren't that easy to pick up here. Again it will be nice to compare the difference. I will make a DD to start with as I already got a jig made. Will be the same size as the IDX just different windings so again a direct comparison will be possible. But might make a smaller CC later down the road for better target separation and better pin pointing if needed.
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I have a bunch of different coils made in 9", a couple with standard windings and some centertapped RX's
and some Minelab ones and also a Whites/Minelab contraption with 36mh RX. With the original Tesoro I can
see if they are better or worst.
Do you know where to get a connector to make my coils plug into the Tesoro?
I know I've seen the info but wasn't too interested as I was making my own at the time. I know there are old
and new ones the old had 5 pins and new 4 but not sure if it is standard Din or something else...
I bought several 10" coil housings thinking my coils would fit but the didn't as they are 9" (was measuring in metric)
so I got 2 9" housings too. But now I find out I need some $35 potting compound to fill them....Comment
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not cheap
http://uk.mouser.com/ProductDetail/S...tCuTKfeRzwXk56
http://uk.mouser.com/ProductDetail/S...252buWGfU4Y%3d
might have the gender the wrong way round not sure if the are the same as whites or opposite
cheaper here http://www.heilind.com/ but 50 day lead timeComment
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Hmm by the time your done you could have bought a nice unit!
I can get some cheapo's from china for $6.50 for 5 sets of male and female but
that means I'd have to change it out on my current units...
The 16mm matches the 5/8" of the Switchcraft so you could easily swap them right out!
http://www.ebay.com/itm/251374547537...84.m1423.l2649
With 5 I can make all my detectors the same so I pulled the trigger and got some. It'll take a few weeks to get here so get em while their hot!Comment
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Switchcraft slimline connectors have always been very expensiveOriginally posted by Silver Dollar View Post
That's what I am going to do also
eBay for switches connectors and potentiometers. Could get the POTs from Mouser but would be very poor quality (which tend to jump around and be unstable) compared to whats on eBay.
Looking on YouTube solder paste looks easier for SMD as it holds the device as well, only a few just over a dollar on DX.comComment
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Not sure about the solder paste. The parts are glued on when we get them. The glue releases with heat so
you can (somewhat) remove them for repair. The manufacturer would use a silk screen to apply paste just
where needed. I'd use it on a microprocessor or other multi legged fine pitch part. The parts on here don't
really require it but if you get it you will have to paint it on so a pen or injector would be best.
A fine tipped iron (the smaller the better), some fine solder, some solder braid, tweezers and some kind of magnifier
is all you need to make this pcb. I find the magnifier makes the biggest difference. If you can see clearly you can
do a good job.
I use a head mounted magnifier with 2.3x magnification and a microscope with 5x for tricky stuff. Something like this;
http://www.amazon.com/OP-TEEK-HEAD-M.../dp/B0000AXFTKComment
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Cheers good for magnification managed to acquire two industrial ones and have a wide selection of tips for my iron. Ordered from DX some good quality solder braid and some solder paste to try. Looking at the schematics and there are some parts missing from the list like the zener diode probably not needed (battery LED)
One of the transistors is a different pad size SOT-323 will have to change the parts list.
Also on one of the thread there was mention of 3 alternate transistors but can only see two type on the schematics. Could have been for the TGSL as some of the thread are merged.Comment
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Um it looks like 3904 and 3906 are the only transistors. Which one has a different pad size?
Some of the audio circuits are different on TGSL, usually to add a BD140 for more volume.
I've seen 1 MPSA13 or 2 transistor or 3 in the audio output stage. It looks like our layout uses
a 3904 and a 3906.
Here's a picture of the 3 possible configurations;
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VT2 2N3904 top left of board between 4024 and 4066 tiny tiny transistor size there room on the board for a normal SOT-23
no 2N3904 in that size listed have to use an alternate partComment
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Oh ya I see it. I noticed the smaller outline but saw the value and assumed it was the same size.
I'd add jumpers if necessary or try to place it just right using the standard part. Ill have to fix that
on a relayout... Most likely a mistake should have been the same size as the others.Comment
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I'll bet the design was originally a Russian one and someone changed some things.
They changed the transistor pads but just missed one. I see hints of this in the
ground areas and some of the caps have smaller and larger pads layered on top
of each other. I get some complaints from a free gerber viewer because of some
of the changes and am not sure the layout guys would like it.
If I make more boards I may start over and put the pots along one side so you
can board mount them. And fix all the details problems at the same time.
Here's an attempt at moving the pots on the current layout;
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Well my board came in today so i'll try putting as many parts as I have on it
then see what I need to order. I have a SMT TGSL coming so want to order
parts for that too...Comment
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Well I can definitely say the resistors are 0805 the 1206's are too big! I squeezed a few in by
soldering one side and sliding it off the pad a bit to have access to the pad on the other side
but not recommended. Most of the caps are 1206 sized but some are smaller (10pf?).
The 3904 that has the wrong sized pads can be soldered but only 1/2 the leg is on the pad,
close enough, it's only to feed the clock to the 4024...
I tried using some 150uf SMT caps for the 220's, one worked but it's tough to get room for the others.Comment
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that's good that 0805 fit for the resistor will not have to redo them again
there is some logic to the caps 10nF and larger are 1206
small ones are 0805
works well for whats the most common at the suppliers
I have started to order all the hardware as that's what will take the longest to arrive. Had to go for a 10 turn POT could not find a 3 turn at a reasonable price. Hope the inductance of the wire wound does not cause any problem.Comment
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