Pinpointer technical issues

[Carl-NC]

Yes, winding is in one layer. No ferrite core. Any adding of ferrite core is recognized as target and min delay increase seriously.

That depends on the ferrite. Some ferrites have a lot of hysteresis and slow down the decay. Others have almost no hysteresis and no effect on decay. I have run a 1mH ferrite cored coil at 3-4us delay.

[Detectorist#1]

Hi Carl,
Thank you for this useful information!

[JoyJo]

That depends on the ferrite. Some ferrites have a lot of hysteresis and slow down the decay. Others have almost no hysteresis and no effect on decay. I have run a 1mH ferrite cored coil at 3-4us delay.

And what brands of ferrites can be used for a pulse pinpoint?

[Altra]

And what brands of ferrites can be used for a pulse pinpoint?

Starting at post 79

https://www.geotech1.com/forums/foru...le-delay/page6

[Detectorist#1]

Hi JoyJo,
What is the real reason for your willingness to use ferrite core in pinpointer?

[Detectorist#1]

In this case, as additional switch, with low control voltages ( +3V and -3V), BC847 transistor have excellent parameters! Attached is version of the schematic with this transistor.

[Artyom]

https://aliexpress.ru/item/100500630...00036703193373 excellent static and moisture-proof pinpoint, practically free

[Detectorist#1]

Hi Artyom,

MD970 is good for coins. My design is useful for grain size objects (appr. 20 times smaller than 1kop).