Latched sensor. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Digital technology
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Unlike conventional switches. buttons and toggle switches, sensors have higher mechanical strength and reliability. So that they can replace the on/off switches. I propose a simple scheme.
It doesn't matter how you touch the E1 sensor - with your fist or with your finger. Transistor VT1 can be in one of two states: on or off (depending on its previous state). In this case, a fist or finger can be on the sensor for an arbitrarily long time - the transistor will change its state only upon subsequent touch.
(click to enlarge)
Elements Dl.1. D1.2 and the timing circuit VD1, R3, C2 provide the formation of a single short pulse from a burst of 50 Hz pulses. arising when touching the sensor E1. This short pulse, applied to the input "C" of the trigger D2, causes it to switch.
Since even this short pulse can consist of several even shorter pulses, an anti-jamming circuit R2, C4 is introduced to eliminate false trigger D3.
The disadvantage of this sensor circuit is that in the event of strong electromagnetic interference caused by the inclusion of powerful electrical equipment in the 220 V network, false trigger switching may occur. To avoid this, a blocking circuit must be introduced for input "R" of flip-flop D2. or provide for a delay in the supply of a burst of 50 Hz pulses to the input of elements Dl.1 and D1.2.
To increase the sensitivity of the sensor, an amplifier based on an operational amplifier chip can be introduced in front of element D1.1.
Author: A. Mikhalevich, Minsk; Publication: N. Bolshakov, rf.atnn.ru
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