forget-me-not receiver

68 forget-me-not - receiver The "forget-me-not" receiver is a TRF design and could hardly be simpler. It consists of a (cascode) RF amplifier, a diode detector, a Schmitt trigger trigger will be low and the astable mu ltivibrator will input be turned off. As soon the receiver loses its 6 ...9V and an astable multivibrator. The sound itself is produced by a piezoelectric buzzer (from Toko for instance). Provided the receiver is within range of or the transmitter, the output of the diode detecmtitt Sch will be high. This means the output of the 91600 signal there will be no voltage out of the diode detector and the Schmitt trigger will switch its out- put polarity thereby enabling the alarm oscillator. is The transmitter and receiver alignment procedure as follows: Connect a DC voltmeter between the inverting 1. Input (—) of the Schmitt trigger and ground. aximum reading on 2. Tune the transmitter Rhea distance between the meter. Initially, te di transmitter and the receiver wil...