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Need help with a 555 circuit

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Need help with a 555 circuit

Postby martinm2k1 » Thu Oct 13, 2011 10:39 am

Hi Guys,

First time poster long time reader ;). I'm trying to create a circuit that will turn on a relay when the trigger is pushed this will stay on for t seconds. As soon as the relay turns off 555B turns on another relay for t seconds.

I am going from the circuit diagram attached. I have connected the 1st relay to the 3rd pin on 555A however when it is connected lm555B is not triggered.

I assume the relay is drawing all the voltage away from the 2nd pin on LM555B. Does anyone know how i can split the voltage/current so that my relay will switch on and the LM555B will be triggered.

Thanks in advance
Attachments
LM555Delays2 (1).GIF
LM555Delays2 (1).GIF (9.07 KiB) Viewed 4900 times
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