When you push the button and release it timer counts backwords and keep high its output until timer go zero.
555 off delay 90-200 sec This is a delay off circuit based on the 555 timer. You can adjust the output time via the 10k trimmer.
When you push the button and release it timer counts backwords and keep high its output until timer go zero.
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All Transistors Data Sheet. Parameters and Characteristics. Transistor Database. Cross Reference Search -->visit here<-- Relays are the best way for galvanic insulation between high and low voltage portions of a circuit. There are hundreds of different relay types. Find out how a relay operates.
The LM1577/LM2577 are monolithic integrated circuits that provide all of the power and control functions for step-up (boost), flyback, and forward converter switching regulators. The device is available in three different output voltage versions: 12V, 15V, and adjustable. have a look at the datasheet This is an online zener calculator. You have to enter the values fir input and output voltage. Then you can find the resistor and zener you will need. check it out The ULN2803A is a high-voltage, high-current Darlington transistor array. The device consists of eight npn Darlington pairs that feature high-voltage outputs with common-cathode clamp diodes for switching inductive loads. The collector-current rating of each Darlington pair is 500 mA. The Darlington pairs may be connected in parallel for higher current capability. pdf here |
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