delta plus 2 help

Is 4538 PIN 10 switching ?   Just static voltage ? 

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http://www.thunting.com/smf/index.php/topic,67088.msg323609.html#msg323609

  There Mono Stable Flip Flop, yest they should be actively switching.  They are being used for your Sampling timing.  If their dead it's not sampling. 

Are you measuring in the DC or AC Range?  Use a Speaker to check them and see if it produces a BUZZ sound. 

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http://www.thunting.com/smf/index.php/topic,67088.msg323621.html#msg323621

   Sounds like you my have strayed away from the Original Schematic a few too many times ? 

   For the Application this circuit is using the 4538 I'm sure any versions Buffered or Un Buffered should work fine. 

Assuming the 4538 are being provided with correct voltages and ground :

If they are not Changing States the chip is bad or it's not being triggered.   These are set in tandem so if the first is not triggered the following will never be. 

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Posted on: February 27, 2018, 04:52:20 pm

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   You need  to follow the Signal from starting point. 

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http://www.thunting.com/smf/index.php/topic,67088.msg323642.html#msg323642

hello
am here again...today i get my new 74hc4538n and when i put them the detector is working...
I want to think this set for every help they give it to me ....home fire thank you so much ...but now can you answer some q ....about the delta plus 2...
I told you its working now but i need some info about the coil.....
1_ i make  a 25cm coil ..how mant turn i must make it and whats the resistor is it 680 ohm or i must chang it ...
2_about the 110|110 cm coil ...the same q ...how many turn and the resistor what...
3_i try 25cm coil with 25 turns and 3.5 mm...and its detect 30 cm for big metal ...so its so poor ...and i try the 11 meter coil with 4mm wire and 13 turns i get also 30cm ...whats the problime now ....is the coil data or what...pleas help

Posted on: March 09, 2018, 06:04:04 pm

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and i see some thing in my  detector ..
1_The both led red and green is working always is that normal...
2_the sens_signal_nois...when i try to set them nothing change....is that okay...
3_the detector can detect my hands when i come near to the coil about 25cm...and also the speaker the same ...if i put my hand up of it the sound chang also any metal near to the speaker the detector is detect it ...the sound change..
4_the j3....in the circuit i put it  i use 3way switch with 3 lines going out...when i keep it in the madel the detector work...when i chang it up the detector become cilent no sound...and when i put it down ...the sound working but no detect any metal ...i  do the circuit the same evert thing ...
Pleas after you read my q answer me sir ...
Thank you alot

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http://www.thunting.com/smf/index.php/topic,67088.msg323744.html#msg323744

thank you for this pic....
I ll try to do the same coil info..
My last q is
what is the j3 switch in the circuit...
It have three pin out..
I use a switch with three pin also
is that right....
When switch it down the detector not detect any thing....and if i switch it for up there is no sound ....if i qeep it in the madel some times working and detect and some times no sound...
I want to know why this switch and how its work
thank you again ...


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