How can i make a delay circuit without using 555 timer?
Answer:
LOTS of ways.
Here's one that uses a 4060 as an analog delay.
http://www.discovercircuits.com/dj-circu...
Here's a completely different "digital" approach using an HC14 as an oscillator to drive a 4040 counter.
http://www.circuitdb.com/show.php?cid=17...
There's lots of this sort of thing out on the web.
It would help if we knew what your delay time should be, and whether you're working at 5V or something else.
How about a flux capacitor?
Or build a 16 bit counter out of
an erasable eprom from Altera?
It would also help to know whay a 555 is not acceptable, how precise the delay needs to be, what characteristics the input trigger and output pulse should have, what should happen when a second pulse comes in while the first is being processed, and some other things about the application.
Other integrated circuits you might consider are the TTL logic devices 74121 and 74123 and their analogous devices in other logic families. You also have the option of building a couple of monostable multivibrators from discrete devices.
By the way, modern designers try to avoid putting RC-based delay circuits with long time constants in their designs because of the discrete devices involved, the lack of precision of the delay, its susceptibility to malfunction from electrical interference, and so on.
Is your heart set on making something you can just buy off the shelf? This company, data delay devices inc, has a wide range of delay devices to suit your needs.
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