Proximity sensor - Page 2

Posted on Feb 6, 2014

First of all, the circuit is ok, but it`s rather unstable. It varies with temperature, and, for eg, I turned it on and I tune it. Them I switch it

Proximity sensor - Page 2
Click here to download the full size of the above Circuit.

engineer it, if we get to some conclusion I`ll post it here (the conclusion, not the schem :P) Ahh, CV is Control Voltage. The theremin/controller circuit has to have a CV out (control voltage out). Then, the other circuit (audio - in this case, a wah circuit), has a pot. We substitute that pot with a LDR and connect a LED to the CV out of the theremin circuit. Together, the LED+LDR make a optocoupler (vactrol). As I approach my hand to the antenna of the theremin, voltage increases, driving the LED. The LDR reacts to the light emmitted and therefore augments its resistence (or diminishes it) and acts like a potentiometer.

Leave Comment

characters left:

Related Circuits

  • New Circuits



    Popular Circuits

    10 LEDS Audio level vumeter
    Programmable Code Lock circuit
    Inexpensive Vhf/Uhf Diode Rf Switch
    avr How to redesign a circuit to use a current sinking IC rather than a current sourcing IC
    5 minutes time delay
    LC feedback Oscillator
    3-channel Audio Amplifier circuit
    PS/2 Keyboard IR Receiver
    Multiuse tiny1
    Touch light switch delay circuit
    Using ASCII keyboard code development system