objektor

744 — elektor july/august 1981 objektor The aim of this circuit is to detect the presence of a conductive object, provided the object is within a certain range. The operation of the circuit is rfore output from the oscillator is rather low,thee a single amplifier stage (T2) has been addThe Schmitt trigger and monostable functions are performed by transistors T3 and T4. VMOS FETs have been chosen for the sake of simplicity and the fact that less components are required with respect to bipolar devices increases the reliability factor ("what you don"t fit don"t go wrong!") This does of course mean that the cost of the project will be somewhat higher. Another application is fluid level measurements totally independent of the condition of the obje maicns (dead, alive, static or moving), as long as it re within this range. The sensitivity of the circuit can be set remotely, by adjusting the preset potentio- This is to avoid wearing out shoe leather meter P1. during the initial (trial ...