TOTeM frequency change question

[Mike(Mont)]

I got the urge to modify the TOTeM receiver to a lower frequency. Any suggestions on how to do this? I think just change the ferrite windings and C1 and C2. Thanks for your help.

[havoc88]

Hello Mont.

That's correct. By changing the induction of the ferrite rod (more windings to get lower frequency) AND-OR the total capacitance of C1 and C2.
If you have already the coil on ferrite I think that it's more wise to get higher values of C1 and C2 (more than the original total of6.9nF) to lower the frequency of the receiver.

[Mike(Mont)]

Thanks Havoc88. I haven't started the build yet. My Contraption works as is, just seeing what the different receiver can do, or if it will work. Probably make some other mods along the way.

[abdou2014]

I had some problem in the display, during the detection the LED does not turn off when I move away from a ionic source , i think we must modify the threshold with comparator circuit

[Mike(Mont)]

Originally Posted by abdou2014

I had some problem in the display, during the detection the LED does not turn off when I move away from a ionic source , i think we must modify the threshold with comparator circuit

Maybe the ferrite rod moved out of place?

[abdou2014]

in passive mode there is this probl?me