2 boxxxx :)

[TH Jim]

I second that Dave - done exactly the same! Gave up on mine as i've no 8 - 10m of free airspace to develop in!!!!

[zixelll]

Hello brother is molded circuit capacitors list boxes russian on Tampa Bay Mqdarshvn You've got me so I do not know what's Shmarshvn Thank you

[chemelec]

Here is the Schematic

[chemelec]

Here is the PCB.

[bernte_one]

hello sascho

cant write you pm you have not allowed
i am interested for a two box pcb, printed shematic and coil data

regards

[zixelll]

I want to thank my friends capacitors numbers marked in red that they got in front of him to write

[totob]

hello
I want to build (Re-make of the Treasure Witcher by Charles Drake). but don't know these type of capacitors used in the reciever board, and if it is polarized or not?.
[IMG][/IMG]


[IMG][/IMG]
- I didn't find the potentiometer 25k . can I use 23k?
- Also I want to make big coils (50cm/40cm) for finding depth objects, how turns of wire I need and the length between two coils ?.
I hope to anyone give me some help.

[totob]

hello
I want to build (Re-make of the Treasure Witcher by Charles Drake). but don't know these type of capacitors used in the reciever board, and if it is polarized or not?.


[IMG][/IMG]

[IMG][/IMG]

- I didn't find the potentiometer 25k . can I use 23k?
- Also I want to make rectangular coils (50cm/40cm) for finding depth objects, how turns of wire I need and the length between two coils ?.
I hope to anyone give me some help.

[Qiaozhi]

where is my post?

Because it was your first post in the forums (and you included a link) the post has to go through a moderation process by the administrators. Unfortunately I hadn't noticed that your post was awaiting moderation. You should be able to see it now.
Note that I have removed the duplicate post you made later on.

[totob]

it's ok

[chemelec]

A 23K Pot is OK.
The .47uF Caps as shown are Polyester types, But Mylar or Disc Types are OK.
The 1uF Caps are TANTALUM.

hello
I want to build (Re-make of the Treasure Witcher by Charles Drake). but don't know these type of capacitors used in the reciever board, and if it is polarized or not?.


[IMG][/IMG]

[IMG][/IMG]

- I didn't find the potentiometer 25k . can I use 23k?
- Also I want to make rectangular coils (50cm/40cm) for finding depth objects, how turns of wire I need and the length between two coils ?.
I hope to anyone give me some help.

[scs]

Detectors of the transmitter-receiver with a frequency above 20 kHz work well only in the beach.In the ground work well at frequencies below 18 kHz.

[totob]

Hello all

I am confused about transmitter schematic. I want you to check it, the pol of 0.1 uF capacitor go to the base of transistor (2n3906) and other pol to the B1 of transistor(2n4870).

but in the PCB and finished board of transmitter the pol of capacitor go to emitter of transistor (2n4870), instead of b1

[Thomas]

I believe this is correct, a good catch.

[scs]

Rather than 2kn 4870 generator can put multi vibrator with timer ISL 7555 or 555.