Question about tgsl

[waleed]

Hello everyone. I'm building a tgsl md and I'm wondering what type of battery and speaker I should use? Check the image below and tell me if it is fine to use those ones or I have to get another bat and spk? .thanks for helping

[waltr]

That battery will work for many, many hours but it will be heavy to carry.

The TGSL draws about 30mA without sound and about 50-80mA with sound.
So at 50mA average draw that battery will last for 1200/50 = 24 hours.

Other than weight the battery will work fine.

I use a small 3-cell LiPo battery that is about 2x3x4cm. This runs the TGSL for over 12 hours.

Speakers are a little harder to tell if they will work. Many have complained of bad sound with some speakers.
I use a similar speaker on my TGSL-EDU (PCB from Silver dog) and it works.
You will need to connect it and listen to how it sounds. If not sounding good then try putting a 100 Ohm resistor in series with the speaker.

There are many posts about this detector since it is very popular. Try reading them for ideas, issues and fixes.
I like how the one I built works.

good luck and please post pics of your build and how it works.

[Tibuck19]

i use 3 18650 that last for a very very very very long time. As for the speaker a .2watt 8 ohm speaker is more than loud enough for parks but not for places along a highway, headphones are better.

[kt315]

If not sounding good then try putting a 100 Ohm resistor in series with the speaker.
---
use 32 Ohm or 50 Ohm speaker for low-current VLF. https://www.aliexpress.com/item/4000...chweb201603_55

[kt315]

i use 3 18650 that last for a very very very very long time. As for the speaker a .2watt 8 ohm speaker is more than loud enough for parks but not for places along a highway, headphones are better.

use 16 Ohm headphones. connected it in series (GND wire is not used), mono-, gives you 32 Ohm general value.

[waleed]

I really appreciated you all for the replies I love how this forum is active...now I'm going to etch the pcb (I have coppercoated board and ferric chloride..etc). But the problem is I think that the pcb doesn't match the schematic (which I have got them from "tgsl complete detailed" thread)..we can see that there is in total 12 ICs in the schematic while in the pcb placement there is only 7 ICe (regardless of the other components which doesn't match also). Please can you tell me where can I get the right pcb and pcb placement paper??

[homefire]

LOL, That battery is going to die of old age before the TGSL drains it. Three 18650 cells in series would be plenty for a few hours of Treasure Hunting.

[Tibuck19]

LOL, That battery is going to die of old age before the TGSL drains it. Three 18650 cells in series would be plenty for a few hours of Treasure Hunting.

With 3 18650's i was detecting 4 hours at a time 3 times a week, only need to recharge the batteries once a month. the IDX is even more efficient, i think i only charged the batteries two times during the summer, and i was out detecting a lot more than that.

[waleed]

I really appreciated you all for the replies I love how this forum is active...now I'm going to etch the pcb (I have coppercoated board and ferric chloride..etc). But the problem is I think that the pcb doesn't match the schematic (which I have got them from "tgsl complete detailed" thread)..we can see that there is in total 12 ICs in the schematic while in the pcb placement there is only 7 ICe (regardless of the other components which doesn't match also). Please can you tell me where can I get the right pcb and pcb placement paper??

Any answer? Please

[kt315]

https://www.geotech1.com/forums/show...mplete-Details

[waltr]

I really appreciated you all for the replies I love how this forum is active...now I'm going to etch the pcb (I have coppercoated board and ferric chloride..etc). But the problem is I think that the pcb doesn't match the schematic (which I have got them from "tgsl complete detailed" thread)..we can see that there is in total 12 ICs in the schematic while in the pcb placement there is only 7 ICe (regardless of the other components which doesn't match also). Please can you tell me where can I get the right pcb and pcb placement paper??

I think where you have gotten confused is some of the IC's have multiple parts inside. Example is the LF353, LM358 and LM393 are dual. They have two op-amps or two comparators inside one IC.
Example: On the schematic the LF353's are U101a and U101b.

I count 8 IC's on your placement pdf.

[waleed]

I think where you have gotten confused is some of the IC's have multiple parts inside. Example is the LF353, LM358 and LM393 are dual. They have two op-amps or two comparators inside one IC.
Example: On the schematic the LF353's are U101a and U101b.

I count 8 IC's on your placement pdf.

Oh I didn't notice that sry...but can you indicate on the pcb placement where is the sens switch and the (disc/am) switch also. Thank you

[waleed]

Oh I didn't notice that sry...but can you indicate on the pcb placement where is the sens switch and the (disc/am) switch also. Thank you

Oki..now everything is clear, excuse me it's the first time of me making a device (even thought that I'm an electrical engineering), I will see if I can improve the depth or the sens when I finish it..now I'm going to make it at weekend..see ya all

[kt315]

what country you are? why you can not write your county in your profile?
people want to see what new member is from.

Anatloy
pleasure

[waleed]

what country you are? why you can not write your county in your profile?
people want to see what new member is from.

Anatloy
pleasure

Sorry, I edited my profile and put my location, so I'm from Jordan (a country in the middle east) tbh MD is forbidden here in my country (government issues..) so it's a challenge for me to make an md, and btw I'm here since 2012 ^^ but I wasn't active due to studying and works..