Automatic timer switch with ua741

Posted on Feb 5, 2014

When the switch S1 / 2 power input to the circuit C1 No. ua741. To a voltage comparison circuit. The pin 3 is the noninverting pin. for pin 2 to pin inverting. The pin 3 was divided voltage from R3 and R4. Used as a reference voltage for comparing the voltage at Pin 2 And the voltage drop across C2. The VR1, R1 and C2 is set to delay. To set up a lon

Automatic timer switch with ua741
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g time. I add the R1 and C2. The switch S1 / 1 to determine the C2 discharge through R10 out. To start new work while off. The switch S1 / 1 and S1 / 2 are in the same But working conditions are opposite. 555 IC Timer control relay SwitchThis is easy Timer circuit projects. Control by relay. It use IC 555. This the circuit sets the time to are simple one that interesting, because use IC LM555 Timer be 8 pin integrated circuits. But can set the time accurate can use by fine while VR1 [. ] Switch off delay circuit by 2N4871 This circuit prevents surges. From the opening is switched off or power failure. The damage to electrical appliances. The circuit will switch to use a short period before Power raising circuit to go. [. ] OFF After Delay Switch by MosfetThis is OFF After Delay Switch Circuit. It is use Mosfet control the work of LOAD get. By have the work is simple be press Switch (Close) and liberate (Open) S1 an electric bell will loud. [. ] We aim to transmit more information by carrying articles. Please send us an E-mail to wanghuali@hqew. net within 15 days if we are involved in the problems of article content, copyright or other problems. We will delete it soon.

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