Call indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators
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This device allows you to make sure that you were visited in your absence? The light-emitting diode HL1 in it starts to glow after someone has used the apartment bell.
When you press the call button SB2 (see figure), positive voltage half-waves are applied to the non-inverting input of the op-amp through the VD3 diode. As a result, a positive voltage appears at the output of the op-amp relative to the common switching point of capacitors C1 and C2. Due to the positive feedback through the resistor R3, the device goes into a steady state, in which its output will have a voltage close to the positive supply voltage. Resistor R6 limits the current through the LED to 15 mA. For a voltage on the secondary winding of the power transformer of 6 V, the resistance value of this resistor is indicated in the diagram, and at a voltage of 12 V it should be increased to 820 ohms.
You can bring the device to its original state by briefly pressing the SB3 button. In this case, a positive voltage from the capacitor C1 is applied to the inverting input of the op-amp, and the op-amp goes into a state with a negative voltage at the output. Diode VD4 protects the HL1 LED from excessive reverse voltage.
It is possible to use the K140UD7 chip, KD103B rectifier diodes and the AL307A LED in the device.
Authors: M.Arendas, M.Rucka
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