Damper Resistor Place

[1843]

Hi All,

Does it differ if damper resistor be mounted in the coil housing or on the pcb ?
I tested both ways and found that if damper resistor be on the pcb, my PI works more stable. Why ?

Best regards,
1843

[Max]

Hi All,

Does it differ if damper resistor be mounted in the coil housing or on the pcb ?
I tested both ways and found that if damper resistor be on the pcb, my PI works more stable. Why ?

Best regards,
1843

Hi,
answer is maybe "thermal". If resistor is on PCB that means it is inside the pcb housing and near other stuff... so its drift is related to same temperature variations that also other components "see" inside the housing.

Around the pcb housing is air... sometimes is body of detectorist (hip mount etc) but not soil.

Having resistor in the coil housing means that you keep it near soil... so if soil is e.g. cold you'll get bigger thermal difference between component and sorrounding stuff (e.g. epoxy, foam, coil housing plastic...) so greater instability cause you have positive thermal gradient due to current flowing in... and negative one due to cold soil/grass/air/coil housing interactions... and thermal fluctuations are no good cause will give resistance variations.

Much better sealing that resistor in a closed environment with low thermal exchange with outside environment (like happens more easy in pcb housing than coil housing).

Kind regards,
Max

[roberts]

..less current through cable....

[1843]

Thanks for the replies,

Max, Is Robert right ?


Best Regards

[Fred]

Roberts, is 1843 right is asking max if you are right?

[1843]

Roberts, is 1843 right is asking max if you are right?

Robert is right and you are right and I am not right... But I want to know Max opinion. He is very expert
I like complete and nice answers like Max's.

Regards!

[Fred]

I know , just kidding coudn´t resist
regards!,
Fred.

[roberts]

Usuallly i am left, but this time i am pushed to be right!

[1843]

OK, I didn't want to make roberts sad... My problem is English! I have problem with it...
I wanted Max to explain about the roberts idea, because roberts didn't explain compelete...


Kind regards,
1843