PIU-A4-12L

[Geo]

Hi NormanB.
I am interesting for the detection distance in the air because is a simple way to compare two detectors.
As i saw at your coil you don't use faraday shield. Why...... do you know who is the first sample time. If you use small delay <20us then it is time to shield the coil
Regards

[Geo]

Hi NormanB.
At ATiny-4, D2 writes "Surpressor Bidirektonal auf Lötseite einlöten"
What does it mean???
At pcb photo, pulsedetectors show the diode with 2 lines as polarity (at both end), but my diode has only at one end the line (as a clasic zener)????
Who is the right??
Regards

[aft_72005]

It is not diode , it is suppressor bidirectional for protection power tr.

[NormanB]

Hi Geo,
I think you have the wrong diode, you need
the bidirectional surpressordiode 1.5KE400CA.
This diode works at both directions.
You can see them in the Miner-2 circuit as D2 and D3,
two 400V diodes in serial = max. 800V peakvoltage

Regards

Norman

[Geo]

Hi Geo,
I think you have the wrong diode, you need
the bidirectional surpressordiode 1.5KE400CA.
This diode works at both directions.
You can see them in the Miner-2 circuit as D2 and D3,
two 400V diodes in serial = max. 800V peakvoltage

Regards

Norman

Hi,
I see it but the diode that i have writes 1.5KE400CA
What a big mistake for the factory to write wrong number on the diode
Anyway thanks
My regards

[NormanB]

Hi Geo,
the number ending ...A means unidirectional,
...CA means bidirectional.

Regards

Norman

[Geo]

Hi NormanB. You have right.
The diode is 1.5KE400, not 1.5KE400CA. So i must order again it. I tried the pcb but there is problem with the ATtiny15L. It gives the Tx pulse but not the sample pulses. I can't understand what happened.
I was very good with analog circuits, what i wanted with the digital
Regards

[1843]

I tried the pcb but there is problem with the ATtiny15L. It gives the Tx pulse but not the sample pulses. I can't understand what happened.
I was very good with analog circuits, what i wanted with the digital
Regards

Hi Geo,
I had the same problem with Tiny-2! If you connect a coil to your detector, you will get the sampling pulses!

Best regards

[1843]

You also can use no diodes. The IGBT has internal protection diode. You may need a larger heat sink if your IGBT gets too hot.

Regards

[Geo]

Hi 1843.
Yes you have right, because is the reset port (PB0). I worked the ATtiny-4 with coil and without D2 and IGBT transistor. I used a IRF840 and it work very good (at 21V). One problem is that i can't regulate the power (Tx pulse width).It has a pulse width of 200us and it is ok for medium to large objects. I used both versions of programing the ATtiny15l but without good results at the Tx width.
An other problem is that i have not good sensitivity..... maybe the coil (it is 1mH from Delta Pulse). Tomorrow i will check the pcb for any error.
I detect a coin 2euro at 10... 12cm and a soda can at 35... 40 cm with 32 cm coil. VERY bad.
Delay is 20us
Who knows
Regards

[1843]

One problem is that i can't regulate the power (Tx pulse width).It has a pulse width of 200us and it is ok for medium to large objects. I used both versions of programing the ATtiny15l but without good results at the Tx width.

Delay is 20us
Who knows
Regards

Hi Geo,
If you want to set the pulsewidth you must program the RSTDISBL Fuse.
The Delay of 20us is wrong. Reduce the damping resistor to 1k. You should get a sample delay between 60 to 120us. Also make a coil like the Norman's.

Best regards,

[Geo]

Hi 1843.
Pulsedetectors gives 2 programs for the ATtiny4, one with fix pulse width and one with variable width. I tried both of them but i have not good results with thr pulse width, but this is not problem.
Now about first sample delay it vary between 20 and 150us, so it is very good.
Second sample is 100us after the first. I wanted it to be at least 200... 250us after the first sample but what to do, it is not at my hand.
Damping resistor is 1K, but i must change it because at the coil i have selfoscilations. About the coil ............. i must find Litz wire first
Today i will try to make it to work Ok
Regards

[1843]

Hi,
At the moment your Attiny15 doesn't read the power pot value. You must check the RSTDISBL fuse before you want to program the chip. ( The RSTDISBL selection is at the fuse bit settings of your programmer)

Regards

[waseem2005]

Hi Geo,
with this coil I can detect a 2€ coin deeper than 30cm in the ground setting of the Miner (pulspower minimum and receive middle).
[ATTACH]4304[/ATTACH]
Regards

Norman

Really good work
But can you explain little bit about your 28cm coil:=
what is the inductance value for outer coil and inner coil?
what is the capacitance value for outer coil and inner coil?
what is the number of turns for outer coil and inner coil?

Best Regards

[NormanB]

Hello,
I will try to answer you at the weekend.

Best regards
Norman