Top 5 elctronic project with bc547 transistor, tri ac, rgb led, photo diode duration. As shown in the following circuit diagram, the relay driver may consist a npn transistor or a pnp transistor. How to make an 8 channel relay driver board optically isolated. The question was asked by one of the interested members of this blog, miss vineetha. Here we have used 12v 10amp relay in this pcb board, but you can also use 5v relays. You can keep improving your circuit, like adding an optocoupler, and play with the circuit to turnonoff the relay using a high or low digital signal from. The phototransistor can be used to switch current in the output circuit. Ground rod driver puller p74144 51200101676 51200101676. Typical relay current driver circuit use an optocoupler connected to a transistor which then drives the relay.
Here is a simple microcontrollerrelay interface circuit with perfect galvanic. The circuit shown in figure 1 will drive the relay through optocoupler in same circuit with same power supply. Optocoupler tutorial about how optocouplers and optoisolators use light to. I have been collecting this information for about 25 years, starting with a well thumbed tucker electronics catalog, and then adding listings from other catalogs, other web sites, and of course ebay listings. Fused biconic taper polarization maintaining coupler glass fusion tower home made assembled at galileo electro optics corp 1987. I have some optocouplers to isolate mcus power and power supply for the relays to control leds, dc and ac drivers. These simple optocoupler relay driver circuits can be used in variety of electronic projects.
Relay coil and sensitive logic circuits optimized to switch relays of 12 v rail capable of driving relay coils rated up to 6. Im wanting to control two 12v relays by means of an npn transistor, and will. The following post describes how to drive a relay by using an isolated method, or through an optocoupler device. This page is intended to be a reference list of basic specifications for electronic test equipment, especially obsolete models. The driven relay can then operate as a switch in the circuit which can open or close, according to the needs of the circuit and its operation. How to use optocoupler and triac to control ac load. Then consider using a latching relay and explore using a pchannel or an nchannel mosfet. Driving relay directly from optocoupler, what is best. I have a question about controlling relays by using optocoupler. To reduce the risk of electric shock, fire or injury, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.
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