Today, we went over switches and relays. We built a few different circuits using different types of switches, and the one depicted above uses two separate SPDT slide switches. Either one of the switches can be used to turn the LED on or off.
This second circuit contains a pushbutton switch (with its momentary state ON) and a DPDT relay. Because of the way the components are connected, the green LED would be lit as soon as power was supplied to the circuit. However, once the pushbutton switch is engaged, a small voltage is sent to the coil inside the relay which surrounds an iron core and a magnetic force causes the pole to meet the other contact. This contact shuts of the green LED and lights up the yellow LED.
This last circuit we constructed is very similar to the first except the power to supplied only to the pushbutton switch and a capacitor was connected in parallel to the relay. Once the pushbutton switch was engaged, the LEDs would light up alternately in oscillation. Without the capacitor, this would happen much to quickly to even be noticeable.
No comments:
Post a Comment