Used AWG34 solid magnet wire to make the last coil I built for minimum delay. Rx_(2)43mm round fig8, Tx oval around Rx. Tx around 10 ohms limited how fast I could charge the coil at constant rate. Added a second winding over the first(both, single layer solenoid)connected in parallel. Seemed to make the coil slower, don't know why. Added 1k resistors between Rx coil leads and differential amplifier input with a 100 ohm across amplifier input(attenuate 20 times) to see if I could learn something. Was faster than original coil but lower amplitude. Including scope pictures with added resistors(copper wire_5). (copper wire_4) was taken with 10 ohm Tx coil, log out calculated with Excel. Log out amplifier not fast enough for AWG28. Wire TC sees to be a little shorter with _5png. Wondering if there is something I could try to get delay time aroud 2usec with coil connected direct to amplifier.
Increased number of wire pieces to increase signal amplitude, doesn't effect time constant.
25mv in=0v out, not 25mv in-0v out(first picture)
Increased number of wire pieces to increase signal amplitude, doesn't effect time constant.
25mv in=0v out, not 25mv in-0v out(first picture)
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