ALONSO PD MISSION ACCOMPLISHED V1,V2

[Morgan]

PDK-3

I also noticed that with the DCH display there is no need for an audio transformer, I made all

the versions and I learned a lot with the modifications !

no need the audio transformer

the RADIO TDA is very strong (if you make the antenna trick is extremly powerfull) when you play with the variable capacitor that is in the circuit you experience great sebsitivity to iron objects,act like a super magnetometer,then you need to find the correct value for precious metals, do you have gold or silver buried 10 years ago for the test ?

[Morgan]

PDK-3

Mr Morgan , I built the TDA with the DCH circuit and with the LM386 and I noticed that with

LM386 has more sensitivity !

did you get the same result ???

when you talk about sensitivity you mean to gold/silver objects or to hands energy ,metal near the antenna or light bulbs?

Did you alrteady try it in the open fields ,to check for results?

[Morgan]

PDK-3

Mr Geo said in the forum that the sensitivity should be in the variable LM317 power supply for

15V, I don't know if you did the same thing ???

I know Geo is eletronic engeneer and know a lot, I m a electronics hobby and do things my way by trial and error, I find the DCH85 very weak , by install the TDA radio ,my antennas configuration(I use two diferent types) and play with the variable capacitor in the radio I get what I need ,a real LRL

see other pictor of DCH antenna variant:

[Morgan]

PDK-3

What is the ferrite circuit? Is it pdk?

Hi

we are talking about PDK-3 , it is a receiver with a FM radio based on the IC TDA, not use FERRITE. The project with ferrite is the Alonso PD.

[Morgan]

PDK-3

In these two photos we can clearly see the addition of the PDK circuit with Ferrite to the DCH

but Morgan don't add this part to his LRL

thats right,no need ferrite,here you can see this PDK-3 that I built for one Geotech forum member,we test here in my field test ,I made the tuning until the adjustable capacitor (10-75 pf)of TDA enter in resonance and start locating the silver bracelet and the gold medal,and he saw all the process

[Morgan]

PDK-3

In these two photos we can clearly see the addition of the PDK circuit with Ferrite to the DCH

but Morgan don't add this part to his LRL

the TDA IC is under the radio circuit,I do things my way, I m not a professional

[Morgan]

PDK-3

In these two photos we can clearly see the addition of the PDK circuit with Ferrite to the DCH

but Morgan don't add this part to his LRL

here two other PDK-3 with a diferent antennas ,smaller prototypes,one with TDA RADIO,the other is simple DCH type circuit with antenna special for more power(even without TDA) both locate very well my test targets

[zakari]

the TDA IC is under the radio circuit,I do things my way, I m not a professional

hi morgan

tda7000 is unstable that is better use another circuit
best regard
zakari

[abdou2014]

Thank you Mr Morgan for your answers

[abdou2014]

this is my first experience with DCH circuit , without TDA stable and work, detect switch spark

but not yet successful with the TDA, maybe there is an error in the circuit ????

[kostas87]

if we analize the PD ,PDKs, they use the passive receiver(circuit nr 5 of the schematic) that is to catch eletromagnetic waves , sothere is the possibility this PHENOMENON is eletrostatic/electromagnetic,maybe...

I wouldn't want to analyze the pd again, it makes me nervous. but if you need the original powerful bfo schematic heatkit that was originally made by pd I have this machine I bought it for $ 25 from CANADA as well as the distances from the parts and you can use some schemes that have a big difference in operation, do not hesitate to ask me. I believe that bfo, if successful, will be very stable and accurate.

[abdou2014]

???

[Morgan]

PDK-3

hi morgan

tda7000 is unstable that is better use another circuit
best regard
zakari

its unstable? here it works fine

[Morgan]

PDK-3

???

this is the receiver circuit , very similar to the DCH85

[Morgan]

PD

I wouldn't want to analyze the pd again, it makes me nervous. but if you need the original powerful bfo schematic heatkit that was originally made by pd I have this machine I bought it for $ 25 from CANADA as well as the distances from the parts and you can use some schemes that have a big difference in operation, do not hesitate to ask me. I believe that bfo, if successful, will be very stable and accurate.

the Alonso PD use the metal detector circuit HeatKit, its a TR/IB sistem, according Esteban a BFO with cristal controler is the best for stability, I want to try but the cristal is hard to find...

here schematic