Damm Damping resistor

[Tibuck19]

Happy Canada day to all the Canadian folks On here,

I have been experimenting with different coils , and of course none of them use the same damping resistor, So what would be a good way to set up the MiniPlus for easy coil swap? AKA fast resistor swapping, Is there a shoe of some kind that one can pop out a resistor for another , or would be a permanent variable resistor pot be a better option, and if so what would be the guru's suggest ? maybe a small trimpot?

Thanks

[Tibuck19]

Maybe something like this ?
https://www.sparkfun.com/products/10613

while at it one could add two more to replace the two other pots and have it all controlled with a micro processor one for the Damping, one for reject pot and one more for the Audio ? have it all In a small menu with push buttons ?

[Koala]

Remove the resistor of the PCB and add the resistor to the coil connector. Then when you change your coil you also change the resistor.

[Tibuck19]

I was thinking that , however I remember reading something about Carl Saying that was a bad I idea , but I don't remember what post it was!

[homefire]

I always put the Damping resister on the associated coil .

[ionut_mtb]

I always put the Damping resister on the associated coil .

if you use it with the same detector should be ok, but if you have other detectors? different setup.

[Tibuck19]

if you use it with the same detector should be ok, but if you have other detectors? different setup.

That is the problem I have more then one, the SurfPi which is my fun go to toy, and the Minipulse plus which when its working right is a joy, and I asked Andy for the Geotech Baracuda. So putting the resistor inside the coil is a no go. I would rather have a input swapping thingy a mobobber lol I am starting to like the idea of having a Digital pot with a small 2X16 lcd running off a Arduino mini.

[Koala]

Can't you just put part of the resistance on the coil connector and the rest on the board.

[homefire]

Easy Fix. Just build adapters for Each machine with correct Damping as required. What ever connectors your use to using just put the resistor in a gender bender connector. Male/Female or what ever.

[Tibuck19]

Easy Fix. Just build adapters for Each machine with correct Damping as required. What ever connectors your use to using just put the resistor in a gender bender connector. Male/Female or what ever.

I use Ip68 waterproof connectors, there is no room for a resistor in the coil side of the connector loll Trust me lol I would of thought of that myself hahaha.

[Tibuck19]

what Id need is some sort of clicker knob with a center point and a way I can place a few values of resistors, Something like that's on the back knobs of a oscilloscope but less complex haha

[homefire]

https://www.banggood.com/2P5T-Channel-Rotary-Band-Switch-Multi-speed-Switch-2-Pole-5-Position-1-Deck-With-Knob-p-1028923.html

[Tibuck19]

https://www.banggood.com/2P5T-Channel-Rotary-Band-Switch-Multi-speed-Switch-2-Pole-5-Position-1-Deck-With-Knob-p-1028923.html

There we Goooo! Nice find!

Now we need to make it fit hahaha

[AirTester]

Happy Canada day.

Is that base mount on your detector 3D printed?

[Qiaozhi]

There are basically 4 places you can choose to fit the damping resistor:
1) On the PCB.
2) In the coil shell.
3) In the coil connector.
4) In the detector enclosure on the inside of the coil socket.

#1 results in the same damping resistor being used for all coils.
#2 is a problem if you want to use the coil on different detectors.
#3 is often tricky because of lack of space.
#4 means that you could use (for example) a 5-pin connector, with 2 pins used for the coil, and 3 pins connected to different value damping resistors. Then the closest required value can easily be selected by a wire jumper in the coil connector. However, there may still be problems swapping between detectors.

Other possibilities (already suggested) are:
1) Add a selector switch to change resistor values.
2) Use an adapter cable.

Personally, I put the damping resistor inside the enclosure on the back of the coil connector.