help please

[Antomost]

I am building the HH1 rev D.
Due to the fact that a commercial board is out of stock I made a double side pcb without plated through holes so the soldering was a pain on parts such as capacitors etc.
It is my first metal detector and I will appreciate it if someone can help with the bellow


Do I have to solder R7 and R14 or jumpers?
What are the jumpers for DD coil and non-VCO?
Best dimensions and turns for DD coil?
Which external pots are needed?
RX and TX coils turns direction?


Thank you in advance
Antonis

[Antomost]

[Qiaozhi]

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[Antomost]

thanks

[Qiaozhi]

I am building the HH1 rev D.
Due to the fact that a commercial board is out of stock I made a double side pcb without plated through holes so the soldering was a pain on parts such as capacitors etc.
It is my first metal detector and I will appreciate it if someone can help with the bellow


Do I have to solder R7 and R14 or jumpers?
What are the jumpers for DD coil and non-VCO?
Best dimensions and turns for DD coil?
Which external pots are needed?
RX and TX coils turns direction?


Thank you in advance
Antonis

If this is the first detector you've ever built, you haven't exactly chosen the easiest of projects. This is arguably the most complex one of them all.

To answer your questions:
Replace R7 and R8 with jumpers.
R14 is the damping resistor for the RX coil if you use a DD. However, I would advise you to first test the HH using a mono coil (details are in the HH article). Also, do as the article suggests, and build the design in stages, testing as you go.
For a mono coil, leave out R14, and short the LI and L2 pins together. Connect the coil between L1/L2 and 0V.
For non-vco audio, insert the jumper that goes between Q6 collector and Q11 base.

Hopefully you do have an oscilloscope, otherwise you'll find this project difficult.

[Antomost]

Yes, I do have an oscilloscope. What about the jumpers in IC9 and in Q3?
it look to me a complete project that why I choose it. Hopefully within the week I will have a test results.

[Qiaozhi]

Yes, I do have an oscilloscope. What about the jumpers in IC9 and in Q3?
it look to me a complete project that why I choose it. Hopefully within the week I will have a test results.

IC9
The lower jumper (in the schematic) connects IC9 pin 2 to n8 so that IC9 becomes a monostable triggered by the secondary delay pulse. This is for the non-vco option.
The upper jumper connects IC9 pins 2 & 6 together so that IC9 becomes an astable multivibrator. (VCO option).
Q3
Connect the lower jumper (in the schematic) to connect Q3's gate to R9/Q2 emitter (remember that R8 is short-circuited).