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Offline ahocool
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« Reply #110 on: March 16, 2012, 08:31:55 pm »
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overnight work ....finally i have conclusion :
 
strange +5V ......must wait until the positive supply rail up from bellow 3v to up 5v ,so the7805 will give 0 output for sometime . The speaker will oscillate via 555
If 5V is achieved ( by connect the base of push pull circuit) then another bad result for CMOS IC VCC ...it give 15 Volt.....oh noooo

i think this design must consider a better way to make -+5 volt or symmetrical supply for OPAMP


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Offline ahocool
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« Reply #111 on: March 17, 2012, 04:51:17 am »
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UPDATE: the circuit is now working correctly ...testing with 20cm coil  and my headset scream at 50cm of blank PCB

the answer is the Xtal 32khz need to be grounded via it's casing , that is why i always need to touch the base of push pull to activate +5v 

N-Channel JFET 2n4393 is replaced with 2N3822 which is a common HAM radio amplifier

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« Reply #112 on: March 17, 2012, 09:37:41 am »
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finally, video link

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http://youtu.be/sgs6Us8PjVs


using piezo buzzer not piezo speaker....loud enough to make your dog bark !

xtal casing is connected to pin 11 of 4001 ! no luck when connected to GND

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« Reply #113 on: March 19, 2012, 01:40:38 pm »
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Well done Ahocool looks like it's working great now all you need is a way to discriminate between ferrous and nonferrous metals 

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So many questions so little time
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« Reply #114 on: March 19, 2012, 08:37:35 pm »
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thank's Xavier , as i read all over the internet, PI is not for discriminate type ... VLF or TxRx is better for discriminate type

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« Reply #115 on: March 20, 2012, 06:09:40 am »
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my friend told me that sascho design is wrong as  NAND gate IC is not CD4001 , anyway it's works by using NOR gate....hmmm ? will testing tomorrow using CD4011(real NAND gate),.....worth to try or not?

fff ....any comment on the NAND gate and CD4001 ?

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« Reply #116 on: March 20, 2012, 01:49:35 pm »
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You can do discrimination on a PI using DSP but it's not an easy task .

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Offline CEaton2012
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« Reply #117 on: April 07, 2012, 10:24:12 am »
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Nice work  Cheesy

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« Reply #118 on: February 07, 2022, 08:13:40 pm »
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Hello, everyone. Sorry I'm late. I am looking for a pi that will work on red soil, can anyone tell me how well it will work on red soil.
Thanks a lot.

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« Reply #119 on: August 06, 2022, 11:10:53 pm »
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It is  that DBP2010 does not have red soil in my place, so l have no way to check, but this detector has GB and cuts ferrite , greetings.

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