dch 85 pistol

[abdou2014]

maybe it is weak and we need to change it

[brain]

this is the PD I made. I'll post the rest based on the answers given. It's a bit cumbersome.

[abdou2014]

after some time I will post the pictures of my mineoro, not yet finished i speak about my new version , according to the mineoro photos of the forum, it is a regenerative ,
Mr Brain , is your pd work in the test field ?

[brain]

a few pictures
https://ibb.co/VxRt9Q0
https://ibb.co/nQRMYhv
https://ibb.co/tpZwdQM

[abdou2014]

good work, what is the principle ?

[humhum]

Originally Posted by brain

a few pictures
https://ibb.co/VxRt9Q0
https://ibb.co/nQRMYhv
https://ibb.co/tpZwdQM

Very good (?ok g?zel ) .

Here Your circuit produce High potantiel Voltage near 20Khz in selected Freq. ,
( 20 Khz HV Gen)
You also can create from 9 Vdc litle Battery to 500Vdc in 20Khz with using small mH Coil,
PIC and few parts , this is 5cm X 5cm PCB circuit. A lso Result .

[brain]

there is more.
You lay 33 khz tx in the ground as two wires. When you move between the receiver and these two cables, a phase shift occurs.

[kostas87]

Originally Posted by brain

there is more.
You lay 33 khz tx in the ground as two wires. When you move between the receiver and these two cables, a phase shift occurs.

very interesting Brain! the buried metal is detected; A similar system is the tesla system,he described to us by esteban it detects buried metals with HV .

[brain]

Originally Posted by kostas87

very interesting Brain! the buried metal is detected; A similar system is the tesla system,he described to us by esteban it detects buried metals with HV .

This is Part of the Receiver Circuit I sent you. The Transmitter Circuit is Separate.

[Douglass]

What is the difference between the 2 transistor dch for the 4 transistor with regulation ??

[aft_72005]

Originally Posted by shahrayar

Hi .. I try this circuit ... TDA7000 receiver work prefect lonely .. but when coupled to Darlington transistors .. then TDA 7000 stop working .
my opinion this circuit not correct

[Geo]

Ohhh ....yes.
This schematics has many errors
A part of this schematic was sent to me by Andreas before many years ago and it was right. I modified it and gave to a member and he gave it to many members, but this schematic has many errors because i drawed them so
I don't hae the original schematic but i remember that there was a LM386 between TDA7000 and darlington.U can connect the output of 386 to darlington via a audio transformer from old transistor radio or .....

[aft_72005]

Originally Posted by Geo

Ohhh ....yes.
This schematics has many errors
A part of this schematic was sent to me by Andreas before many years ago and it was right. I modified it and gave to a member and he gave it to many members, but this schematic has many errors because i drawed them so
I don't hae the original schematic but i remember that there was a LM386 between TDA7000 and darlington.U can connect the output of 386 to darlington via a audio transformer from old transistor radio or .....

base on my experiment the dch85 lonely worked perfect ...why did add tda7000 receiver ?

[Geo]

Mineoro had use TDA7000 years ago at previous model as VC86, VD88, 2000 etc.
WHY??? I am not sure.... maybe it wanted an easy electromagnetic detector together with the static....

[aft_72005]

Originally Posted by Geo

Mineoro had use TDA7000 years ago at previous model as VC86, VD88, 2000 etc.
WHY??? I am not sure.... maybe it wanted an easy electromagnetic detector together with the static....

yes , some modes with TDA7000 . but not at input .
there isn't true and correct diagram .

[abdou2014]

all members, the DCH receiver can work without TDA and its very sensitive to static field, i did too many experiment with it and understood all it's secrets

[aft_72005]

Originally Posted by aft_72005

base on my experiment the dch85 lonely worked perfect ...why did add tda7000 receiver ?

As my experiment with my homebrew DCH85 without FM receiver , can detect from 3 meter .
buried copper 10 x10 cm 12 years ago

[abdou2014]

you were right, I added a VLF preamplifier to my DCH, with low pass filter and 50 hz notch filter

[abdou2014]

Hi aft_72005, what's the distance between the receiver coil and stimulation coil on your DCH ?

[aft_72005]

Originally Posted by abdou2014

Hi aft_72005, what's the distance between the receiver coil and stimulation coil on your DCH ?

Hi abdou2014


about 5 cm .

[abdou2014]

Thanks, when i test my dch its very sensitive to spark and static field, impossible to work on area near power line even if its about 1Km far, is it also for you ?

[abdou2014]

The TDA is for CAP reception, we can use two rx coils TDA and DCH , or use TDA as stimulator for DCH, The question for master members is : the TDA cap reception alone without DCH coil can capture the phenomenon ???

the adventage for TDA rx alone is the immunization to the interf?rences .

[abdou2014]

the real passive receiver of Alonzo is also cap rx, not what you found here modified as E-EM receiver, it work on VHF range

[aft_72005]

Originally Posted by abdou2014

Thanks, when i test my dch its very sensitive to spark and static field, impossible to work on area near power line even if its about 1Km far, is it also for you ?

No. not sensitive to EM filed .

[abdou2014]

I understand that we do not have the same configuration, what type of field or energy is your DCH sensitive to?