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#101
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maybe it is weak and we need to change it
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#102
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this is the PD I made. I'll post the rest based on the answers given. It's a bit cumbersome.
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#103
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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 ? |
#104
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#105
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good work, what is the principle ?
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#106
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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 . |
#107
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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. |
#108
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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 .
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#109
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This is Part of the Receiver Circuit I sent you. The Transmitter Circuit is Separate.
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#110
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What is the difference between the 2 transistor dch for the 4 transistor with regulation ??
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#111
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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 |
#112
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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 ..... ![]()
__________________
Geo |
#113
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base on my experiment the dch85 lonely worked perfect ...why did add tda7000 receiver ? |
#114
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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....
__________________
Geo |
#115
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yes , some modes with TDA7000 . but not at input . there isn't true and correct diagram . |
#116
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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
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#117
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buried copper 10 x10 cm 12 years ago |
#118
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you were right, I added a VLF preamplifier to my DCH, with low pass filter and 50 hz notch filter
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#119
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Hi aft_72005, what's the distance between the receiver coil and stimulation coil on your DCH ?
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#120
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about 5 cm . |
#121
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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 ?
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#122
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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 . |
#123
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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
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