The time of the shutdown delay will be appropriate when powering exhaust fans in the bathroom. The main task is to save electricity and reduce the degree of wear of parts through the use of the relay. But buy it a little expensive, so many seek to assemble a device with their own hands. The time of time with a delay in the interval of 1 to 60 seconds will be able to master any home master if the design is assembled in accordance with the scheme. The time relay is used to delay turning on/off various electrical appliances. The timer is set for a certain exposure of the device time after turning on the power. If you need to purchase a Timer Dnepropetrovsk is ready to offer a large assortment of such devices with various time delay ranges. To independently assemble such a design, you will require three ionistors with a face value of 1, 5 farada and a voltage of 5, 5 volts, an electromagnetic relay 5, 5 volts, 2 motion switching with two fixed positions, as well as a button to supply the charge of ionistors directly from the power source 5-6 volts. The time of time with a delay in turning off with your own hands to charge the ionistor requires 15 seconds. To supply voltage, you should press the button. After which the charged ionistor is able to maintain voltage for 30 seconds. At this moment, the ionist drops the charge, as a result of which the relay is triggered, after which the load is turned on/off. The second installed ionist increases the delay interval by 30-40 seconds., And the third is another 1 minute. Ultimately you get a timer with a temporary delay with three positions. The device was created according to a simple scheme and involves the use of only one bipolar transistor, which performs the function of the transistor key. This will allow you to control the electronic relay in the future. The time of time with the delay of turning off with your own hands, the initial state of the relay must be turned off, the condensation is discharged. As soon as the switch is transferred to the “turned on” position, condensate will begin to charge. The transistor at this time should be open, since the charge current goes through its base. As soon as the capacitor begins to receive the charge, the base of the base will decrease, and the transistor will come out of saturation. As a result, the collector current decreases faster at the moment when it is no longer enough to hold the relay, it must be released by opening the contacts. To restart the relay, you need to change the position in “off” on the switch, and after the capacitor is discharged, turn on the device again. During the delay, the capacitor face value will affect. Its adjustment is carried out by a variable resistor.
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