Home

Timer

Time Delay Circuit

Fri, 07/24/2009 - 20:36 — vip

Time Delay Circuit

In the design of analog circuits, there are times when you would need to delay a pulse that came into a circuit before being used for the next process. This time delay circuit uses a 555 timer to delay a pulse that comes in to a maximum time of 75 seconds. The timing of the delay can also be changed by changing the resistor value of VR1 and the capacitor value of E based on the time delay formula of t=0.69RC.


5 to 30 Minute Timer

Thu, 07/23/2009 - 09:56 — vip

Descriptipn:
A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps.

Circuit diagram

5 to 30 Minute Timer


24 Hour Timer

Thu, 07/23/2009 - 09:54 — vip

Description:
These two circuits are multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is that when the time runs out, Version 1 energizes the relay and Version 2 de-energizes it. The first uses less power while the timer is running; and the second uses less power after the timer stops. Pick the one that best suits your application.


Syndicate content