Powerful PI or Hammer Head (how to increase power of coil?)

[rajesh]

hh

Rajesh, do you have an oscilloscope? How do you know TP7 fluctuates? TP7 should be identical with TP6, just a bit later in time. That pin should give very clean pulses and it is a simple circuit, almost identical with the circuit that provides signal at TP6. Compare the signals or voltage levels at pins of IC11 with IC12, they should be identical.
Also, the voltages of Q8 and Q9 should be the same.

Regards,
Nicolae

hi nick i have no that only multymeter digital can you tel me vallue of resister that will be fit ic5 pin number 3 to ground....

[vasster]

Hi rajesh, download miscel is a program that helps

[rajesh]

hh

Hi rajesh, download miscel is a program that helps

hi vasster very thank's good link provide you.....

[Unregistered]

to NERDS

Hi Rajesh,
A large diameter coil will be less sensitive to smaller targets, but it should detect the large targets at a larger distance than a smaller coil.
To increase the sensitivity of large coils, Tinkerer has a suggestion, to use a concentric coil. The smaller coil would be the receiver coil and for the same inductance, it will have more turns than the outer (transmitter) coil.
Regards,
Nicolae

Rajesh where are u digging , do u have nice points to dig, use the modified circuit from the twin loop tresure seeker , use 2 coils one for Rx one for Tx, separte the powers lines. use lrge Tx coil......goes down to 2 feet for a 2 feet by one feet copper buried object,

[rajesh]

Rajesh where are u digging , do u have nice points to dig, use the modified circuit from the twin loop tresure seeker , use 2 coils one for Rx one for Tx, separte the powers lines. use lrge Tx coil......goes down to 2 feet for a 2 feet by one feet copper buried object,

hi i don't understand what are you saying. can you send me some link. treasure seeker is a tow box type locator. i have done hammerhead this working at least fine below a dete-1) Thumb pin
Approx. 10 cm
2) Cartridge
Approx. 30 cm1) Thumb pin
Approx. 10 cm
2) Cartridge
Approx. 30 cm
3) Large 1 Rupee Coin
Approx. 30 cm
4) Bear can
Approx. 50 cm
5) Hand Grenade
Approx. 90 cm
6) Anti-tank mine (large metal)
Approx. 150 cm

3) Large 1 Rupee Coin
Approx. 30 cm
4) Bear can
Approx. 50 cm
5) Hand Grenade
Approx. 90 cm
6) Anti-tank mine (large metal)
Approx. 150 cm
ction range...rajesh

[rajesh]

hh

Rajesh, do you have an oscilloscope? How do you know TP7 fluctuates? TP7 should be identical with TP6, just a bit later in time. That pin should give very clean pulses and it is a simple circuit, almost identical with the circuit that provides signal at TP6. Compare the signals or voltage levels at pins of IC11 with IC12, they should be identical.
Also, the voltages of Q8 and Q9 should be the same.

Regards,
Nicolae

hi nick there are a countiniue tick -tick sound in speakar when i adjust r 18 it goes to down but sensitivity has loose

[nick_f]

hi nick there are a countiniue tick -tick sound in speakar when i adjust r 18 it goes to down but sensitivity has loose

What IC are you using for IC6? Are you using NE5534? I checked a few different types and NE5534 gave me the best results.

Did you adjust R18 while measuring voltage between ground and TP4? It should be zero volts when no target is near the coil. Also, R23 should be about to the middle position.

Regards,
Nicolae

[rajesh]

What IC are you using for IC6? Are you using NE5534? I checked a few different types and NE5534 gave me the best results.

Did you adjust R18 while measuring voltage between ground and TP4? It should be zero volts when no target is near the coil. Also, R23 should be about to the middle position.

Regards,
Nicolae

hi nick ic 6 is TL081. all measuring is fit. tp7 is some fluctuate but no problem from here. there are problem in audio section. i don't understand what's doing ic7 > C < i think pulse coming from there. when i replace [r 35] 5k to 10k sound goes to down but contiusly tick tick. when i short switch 2 sound goes to off few second.

[gocko]

amateur

On my hammerhead Power consuption is 100mA, is it right ? I have made mono coil with lan cable : diameter 35 cm, 24 turns, my damping resistor is 1k ohm. I have good results on the air , I have not try outside.

[Carl-NC]

That sounds about right, I remember 80mA but it depends on frequency and TX pulse width.

[gocko]

ahaa

I think that reason for my around 100mA consumption is that my Hammerhead works on Passive Pull-down of Irf740. Can be better if I try to change it on Active Pull-down . Then I think that need to change pin1 with pin2 of IC11 ?
Then we will have 2A consuption? Detecting will be deeper ?

[gocko]

adding

And hotter IRF740