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Flash alternately principle explanation

2017-02-03 13:16
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This article is alternately flash principle explanation. By convention, in order to better grasp the principles you are, we recommend you to combine text read schematics. The circuit uses three easy access timer circuit 555. All three work  multivibrators  instability. 555 there is a first time and off time is equal to 1 second. This IC controls the on / off times for other 2555's flash two bulbs through the relay contacts. The rate of occurrence of flashing 4 flashes per second. 555 IC diode is used to protect from peaks. Relay should have an impedance greater than 50 ohms me. e, they should not draw a current of more than 200 mA. Flashing sequence is as follows: The lamp (s) connected to the first relay flash rate of about one second per second 4 flash. Then the lamp (s) connected to the second relay flash of 1 second per second 4 flash. Then the cycle repeats. Flashing rate can be varied by changing the capacitor C3 and C5. A higher value gives a lower flash rate. Note that if you use normally closed contact, a light bulb will flash while the other is. This value should be equal C3 and C5, should be less than C1. The value of C1 controlled slew rate (default is 1 second). A higher value gives a lower conversion rate. If you are using a normally open relay contacts, the lamp will be turned off, while the other is the flash, and vice versa. If you are a first reading on this principle, we recommend that you carefully read several times in order to better fully grasp this simple but effective circuit.

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