Simplest PI detector possible?

[Silver Dollar]

R1/R2 C1 set the Frequency and pulse width for the TX. I think the 1N and 10u on the second opamp set the
sample delay and width.

Does anyone know how to safely look at the TX pulse with a scope probe rated to 300V? If I can do that I can
do a few measurements.

[baum7154]

Looks like pin 1 of IC2A is a safe place to probe cause the diodes and resistor isolate the flyback and the amp is on all the time.

Regards,

Dan

[paku]

this project still dont have final schematic ????

[geoscash1]

my changes to schematic

Paku, this is the redraw of what changes I made and it works fine for me, it detects quarters at 8 inches, attached the latest I re-did. the only think not on this drawing is the damping resistor change, on my boards I used a 1.2k 1 watt because I am using a spider coil with them.

[paku]

Paku, this is the redraw of what changes I made and it works fine for me, it detects quarters at 8 inches, attached the latest I re-did. the only think not on this drawing is the damping resistor change, on my boards I used a 1.2k 1 watt because I am using a spider coil with them.

[ATTACH]30946[/ATTACH]

nice and thanks bro
i will try make this

best regards, Paku

[paku]

the schematic have 5k pot not clear connection

[sergioguzzo]

Someone could help me. my circuit only works with the capacitor C7 inverted (polarity) transistor Q2 becomes too hot.

Anyone know what is???

[Silver Dollar]

C7 should explode if its in backwards. Check your power supply and show us a picture if you can...

[scrungy_doolittle]

Hey, I'd be interested. I'm getting ready to kick off a hybrid project. Replace most of the analog with a PIC24FJ128GC010

[bernte_one]

Paku, this is the redraw of what changes I made and it works fine for me, it detects quarters at 8 inches, attached the latest I re-did. the only think not on this drawing is the damping resistor change, on my boards I used a 1.2k 1 watt because I am using a spider coil with them.

[ATTACH]30946[/ATTACH]

can you also post the pcb layout for this shematic

have asked you for updates on this project also on thunting
but seems you not read this

have registered on treasure sweeper an see that you have taken the layout i have done, but it is an older Version
did you redrawn this


Kind regards

[6666]

Hey, I'd be interested. I'm getting ready to kick off a hybrid project. Replace most of the analog with a PIC24FJ128GC010

Are you going to show us your work ?

[Al 2014]

Hi, for those of you who've built kits, do you know if I can use an 1/8" phone jack and socket as a 12v power lead coupler? At the moment I have a 9v style clip on n it's a bit if a pain clipping on and off? I have a spare jack and socket, if it's a no go and will have to buy a DC connector. Thanks for any input

[Beenthereuk]

Use min 1 mm multistrand cable with it and you should be OK up to a couple of amps.

[Al 2014]

Thanks for everyone's input, I think I can progress from here.

[bernte_one]

did anyone make further steps on this project

maybe i will try it the third time this weekend