TESORO GOLDEN SABRE

[dfbowers]

How to get it?

I don't think it's a big deal.. Just drill one additional hole and feed one lead from the 220uF cap to the end of the 100 ohm resistor. Just add an errata sheet explaining where to drill and route.

If you have a significant number, just sell them as-is with the mod. I can post how to correct if that's what you want to do.

Don

[silverdog]

TGSL

I don't think it's a big deal.. Just drill one additional hole and feed one lead from the 220uF cap to the end of the 100 ohm resistor. Just add and errata sheet explaining where to drill and route.

If you have a significant number, just sell them as-is with the mod. I can post how to correct if that's what you want to do.

Don

That would be great Don if you would, I can drill the holes if needed before sending out
I think it only fair to reduce the price though

Glad it's not a major problem, I'll sleep better tonight now

[eduardo1979]

I assure you of my heart that as circuits are functioning perfectly. It's all checked and everything is fine. What has been released after some modifications are truly who are not so important. Everything can be tested and each one can do to your taste.

[eduardo1979]

Video my TGSL.
http://img853.imageshack.us/i/6m9.mp4/

[silverdog]

Good News, but I'll take a hit and shift them - just £3.75 each in my shop now

Eduardo, do you want to send me the correct .Lay soon so I have it for the next order ?

regards
Silverdog

[silverdog]

Video my TGSL.
http://img853.imageshack.us/i/6m9.mp4/

Very Good !!

Homemade coil ? dimensions ?

[eduardo1979]

Yes. Search coil 10".

[habitbraker]

oh, wish I was one week later

By the way - recieved two PCBs today. Perfect quality Silverdog!

That C27 error doesnt look like big deal to me. One drill and connection to closest GND

That C simply decouples relativly hi current speaker driver from rest of the circuit so that battery voltage doest suffer from high current spikes

[dfbowers]

TSGL - Silverdog's PCBs, Errata

That would be great Don if you would, I can drill the holes if needed before sending out
I think it only fair to reduce the price though

Glad it's not a major problem, I'll sleep better tonight now

Finished my board last night, and below is the only change I had to do.

For the 220uF cap in the audio section , drill a hole at a 45 degree angle, maintaining the same lead spacing. The new hole will now accept the negative lead for the 220uF cap.

Flip the board over and route the negative lead to the center post of the 7808 regulator.

That's it!

Additional notes:

The holes for the 7808 as well as holes for some of the wires to the pots and leads to the coils should be larger..

Components that fit on Ivconics PCB will not fit quite right on this PCB.. See the mounting of the 7808. Clearance should be a little more in my opinion.

Hope this help..

Don

[dfbowers]

Eduardo's TGSL PCB- Update..

I have the PCB from Silverdog up and running! Right off, an improvement over the version in the "TGSL complete details". Audio is slightly longer and stronger, even with a 100 ohm resistor substituted for the 22 ohm resistor in the audio section.

Also, sensitivity adjustment is much more drastic. I can only advance it mid-way before becoming unstable. NOT using any other mods..

Detection range: For initial testing, 31cm with my 8" DD home built coil! I can't remember exactly how it tested on my other TGSL but maybe a 3cm improvement.

Will test my 10" coils sometime next week. Kudos to Eduardo!

Everyone have a good weekend!


Don

[eduardo1979]

Tgsl Edu

You're welcome!

[simonbaker]

I was only considering the general layout and parts differences. The schematic would be the same for the left half with the exception of a few component values, but I admit, the changes could make significant differences. I will let you know in a day or so as I will probably put it together tonight..

If I have time and get a .pdf plug in to edit the schematic I can document this version.

I think Silverdog could benefit from having matching schematics with his boards.

Hi Don:

If you have a complete correct schematic it would be great to see the whole thing. I'm not exactly sure about all the "decoupling" capacitors mentioned and their values.

I'm wondering if the slightly better audio you observe is due to the audio amp circuit or rather to the longer response due to the changed caps and resistors in the filter/amplification stages.

I think slower response versions have been long overdue for discussion - the question is, what is the "perfect" response to design for? One of the reasons I'm interested in a digital version of the TGSL is so you can "dial in" any response you want into the digital filters, for different hunting requirements and different coil sizes. It could be another knob on the controls.

-SB

[dfbowers]

Sure, I can post up this version. I had a bag of .1uF caps left over after this build. I don't think that they are required but certainly is one of those "best practices"!

I still need to spend some time evaluating the stability aspect of this version as there is always a trade-off. I don't know if this is something that can be simulated or we just need to test in a real life environment.

BTW. You may be able to easily mod the version that I sent you without too much trouble.

More later..

Don

[simonbaker]

Sure, I can post up this version. I had a bag of .1uF caps left over after this build. I don't think that they are required but certainly is one of those "best practices"!

I still need to spend some time evaluating the stability aspect of this version as there is always a trade-off. I don't know if this is something that can be simulated or we just need to test in a real life environment.

BTW. You may be able to easily mod the version that I sent you without too much trouble.

More later..

Don

Sounds good. BTW, what was the total cost to you to buy those PCBs including shipping to US?

-SB

[dfbowers]

Sounds good. BTW, what was the total cost to you to buy those PCBs including shipping to US?

-SB

Simon,

I think it was in the neighborhood of $50.00 but could be cheaper if parts were bought in higher quantities. Like Mouser has pricebreaks starting at quantity of 5 for most things and goes down significantly from there. I'll have to ask Silverdog what kind of deals he has been getting.

If built with TL071's instead of LM308s you can shave about $10.00 off the cost of the whole project.

More testing with Eduardo's version today. On the downside, senstitivity cannot be decrease enough in my opinion, particularly in the AM mode.. but that's inside the house.

For a 1e, distance range from 25cm min sens to 40cm max before it becomes unstable with 10" coil in disc mode. I need to box it up and take it for a hunt this week to see how it really behaves.

Don