MAGNETOSTRICTION TV REMOTE CONTROL

Posted on Feb 5, 2014

Frequency of transistor oscillator is controlled by either of two lengths of nickel tubing, each looting inside form having two coil windings. One coil acts as driver and the other as pickup to provide feedback voltage for sustaining oscillation at control frequencies of 38. 5 and 41. 5 kc. Aluminum diaphragms on front ends of tubing increase acoust

Click here to download the full size of the above Circuit.

ic output. -N. Frihart and J. Krakora, Ultrasonic Tones Select Tv Channels, Electronics, 31 :23, p 68-69.

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