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0.3 Second to 10 Hours Timer Relay with 4541 IC

2015-03-01 10:02  
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0.3 Second to 10 Hours Timer Relay with 4541 IC
This timer relay circuit uses the CD4541 IC and has 2 timing variations configurable with RC elements. The specifications of this timer are: modes of operation: astable/monostable the output has a 6A/250V relay with NC/NO contacts LED signals exiting the timing state manual programming done with a DIP-switch 12V voltage operation For the 0.3 second to 10 minutes timer version the potentiometer is 100kΩ, R1 = 9.1kΩ, R2 = 910kΩ, R3 = 220kkΩ and C1 = 100µF. For the 15 seconds to 10 hours timer version the potentiometer is 1MΩ, R1 = 51kΩ, R2 = 1.2MΩ, R3 = 1.2MΩ and C1 = 1µF. The operating mode is selected with the third contact of SW1: ON position = monostable O position = astable In order to start the timining you have 2 possibilities: you either connect the START point to ground GND and in this case the timer starts when you connect it to the voltage supply or you can place a switch to start it. All the resistors are 0.25W and C1 must have a good stability over time.