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Light Actuated Relay Circuits (C945)

2014-12-22 01:53  
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This article describes the Light Actuated Relay Circuits (C945). The content is very simple, very helpful. Components in this article can help you understand better understanding of this article. For example, in this article, you can go to find and buy these components: C945.

The Sun – Up Relay Switch can be used to provide a audible switch for when the sun comes up. It can also be used to detect a light beam, headlights etc.
The Light Actuated Relay Circuit be office circuit with the light. The prominent point of this circuit be meet the light has fast more using LDR control circuit the very. When the light leaves work suddenly. When meet the light makes Photo Transistor work bias current change it has made the transistor works to cause Relay work with. For VR1 perform fine decorate the rapidity of the circuit. This circuit is the circuit is simple. The equipment that use to replace can. such as Q1 =2N2222use other number can replace almost be finished request a kind NPN alike enough such asBC549orBC337or C1815 orC945etc. For oval should use 6V-9V sizes that are valuable the resistance within relay coil about 500ohm. Other detail has a little , then build easily sir.


Mini switch control circuits with light, by used the photo transistor is a light sensor, andSchmitt Triggeroutput drive current, Out a load or an external circuit,can supply up to 25 milliamps.
This circuit uses less equipment. Can be used for small loads directly.Or used to drive relays,or The deviceOptocouplertype,for To drive the load, AC or DC high-voltage.

Mini switches controlled by light

The circuits working, when the light hits the photo-transistor Q1 the current flow through the junction collector-emitter. And, to a voltage drop across VR1 is a voltage “high”, to trigger the first Schmitt Trigger IC1 / 6 ,the output comes out as “low”.And a Schmitt Trigger, 5 parallel to the inverter gate, the output voltage of the output is “high” in parallel, so that the maximum drive current, or about 25 milliamps.
The Resistor R1 and capacitor C1 to an RC network to block noise that may be inserted.The problem of noise may increase slightly the C1, a private variable resistor VR1. To adjust the sensitivity of the switches Q1, when the light comes on. Circuit can supply up to 16 volts.


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