King Cobra PCB

[calebsone]

just got my boards I am starting soon I will post my results and or hurdles for now got to get the last few components Ill post pics later all most forgot KT your the man thanks for the great work and support on this thread

[sdowman]

thanks

[kt315]

hi sdowman, I did wait accu holders bought in local shop. I sold original PCB with them. I did gather with my board and testing will be continue. a coil that was with the detector was also opened but I see nothing new and interesting inside. thanks.

good luck

[sdowman]

Hello kt315,

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

kind regards

[golfnut]

I estimate the Rx coil has ~ 500 turns


S

[kt315]

[kt315]

will share some pics of Tesoro 8x9' coil from russian forum.

[kt315]

Hi, unfortunately I have no transistor MPSA 13 I can replace the order?:
MPSA42 NPN Gehäuseart TO-92 I(C) 500 mA Emitter-Sperrspannung U(CEO) 300 V

greets

Not. MPSA13 is Si-N- Darlington. you can replace by MPSA12 MPSA14 BC517 BC617 BC875 BSR50...52 MPSA25...29.

good luck

[herpes]

Hi, unfortunately I have no transistor MPSA 13 I can replace the order?:
MPSA42 NPN Gehäuseart TO-92 I(C) 500 mA Emitter-Sperrspannung U(CEO) 300 V

greets

[walkman]

hello friends;
I have a question;
What are the values in the C7 and C8 pcb? parts list says not installed
Waiting for your help. The graduates can also add video?

[matrix]

I write again - there are not mistakes in first PCBs batch and not in second PCB's batch

I believe you , that's right. i asked questions, to promote my info.
You right, my smt caps are 33uf-25v and nonpolar caps are handmade, may they are making problems.
thank you.
also thank you Legaucho

best wishes
M

[Legaucho]

Hello matrix

I have two King Cobra with pcb coming from KT 315, the both are working perfectly except a additional parasite noise sound in 'Metal Mode' Please look in your side, there is for sure a mistake.
All the best, Legaucho from FRANCE

[kt315]

in my opinion you try to find a mistake in the layout while the mistake is at your hand made board. I write again - there are not mistakes in first PCBs batch and not in second PCB's batch, because the board is due full precise copy of the original one, detail-in-detail, line-in-line, point-to-point, I use special utils of P-CAD to find errors/violations on every step. do not waste a time on the pics and find your problem. may be resistors' value or short circuit somewhere, I can only guess.

[matrix]

I knew KC by your great troubles and in my opinion now this is your product . what i see is a man supports and supports, but i cant support him! in fact i do nothing for him
yeah, seems i have to change my pcb board to a new faultless one, but who can provide it ? unfortunately i am living in embargo , in my country , Iran , even the circuit parts are not available at all, and impossible transfer money to purchase a thing from other country.
I know this is my problem, so let me die in governments sensuality .
sincerely
M

[kt315]

ohhh , there is +8.xx volt on my mpsa13 emitter connected to speaker . Is it right???

not, there has not to be DC voltage. only AC. while you hear a sound... may be you do not notice that voltage on the emitter is AC.