King Cobra PCB

[kt315]

[kt315]

I found this some kinda a sample in epoxy of soldered pad's sclice in the pocket. It gives a representative I bielieve of you can appreciate a quality.

[Legaucho]

New PCBs' bunch has been arrived. Anyone may order the TGS un-Light Advanced, ie TGSULA, board.

all the best

[ATTACH]21691[/ATTACH][ATTACH]21692[/ATTACH]

Hello kt315,

Looks beautiful, can you give us the price and show the complete picture.

kind regards

[kt315]

New PCBs' bunch has been arrived. Anyone may order the TGS un-Light Advanced, ie TGSULA, board.

all the best

[Legaucho]

Thanks kt315, I will try it.

[kt315]

Hi Legaucho, do you mean to decrease the sound level? You can increase R77 value or/and can also to desolder R76 out, in my opinion this way has to work.

all the best

[Legaucho]

Hello kt315

Do you have an idea to reduse the sound speaker on King Cobra? Thanks by advance

[Legaucho]

Hello all,

My King Cobra works fine now, my problems were due to a few deffect components . For All Metal Mode function I removed the capacitors C7 and C8. I use the King Cobra with Tesoro searchcoil 9'' X 8''
The caracteristics of the Tesoro 9'x 8' concentric coil:

RX = 6.54mH ( 24.9 Ohms )
TX = 6.03mH ( 26.1 Ohms ).

Many thanks again KT315 and Eduardo

[kt315]

I made a mod you see. Did put a connector for charger in box, it is easy to charge now the batts. So all are ready to make some tests. regards

[kt315]

SPDT switch with one side momentary (ON-OFF-MOM) can be used

I give a related clipping from HAMMERHEAD Pulse induction metal detector, the article of Carl-NC. page 6.


To easily switch between motion mode and zero-motion mode, the PCB includes pads for a panel-mounted switch. The mode switch should either be a momentary-contact pushbutton switch located for easy thumb access, or a momentary toggle switch for index finger control. If a CMOS opamp is used for IC8, then a SPDT switch with one side momentary (ON-OFF-MOM) can be used, similar to the mode trigger used on White’s brand detectors.

[Legaucho]

Hello kt315
Many thanks, I have a better view now. Super

[kt315]

MODE switch

[kt315]

for better insight.

[kt315]

Hello,

with a three position switch, the all metal mode works now. Many thanks. The all metall mode is a little strange without a tone for iron. Next tests outddors.

Regards
Jürgen

you can try to experiment like you see at diagramm - either 1 or 2, connecting by wire. I yet do not try this way, only expecting that it may be working in ALL METAL mode with the disc.

[kt315]

Hello all,

My wires on sitch Mode was in a good order. I unsoldered all wire of the Mode switch and after I put in contact 1ML and 1MM together ( like All Metal mode ). Nothing no sound?

1ML with 1MM together is momentary switch position, not effecting all time, the push-and-release position. it resets the SAMPLE-AND-HOLD circuit in some zero state because All Metal is static mode. after you momentary touched 1ML with 1MM, you have to put the switch in middle position on all time, 'neutral position'. then that will be ALL METALL mode.