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555 Delay Circuits

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8 Threads found on 555 Delay Circuits
It sounds as though you want multi-stage timing cycles. Here is a vast collection of circuits for 555 timer IC:
G'day Mate, Bit tricky using passive components only! but depending on how accurate you need the 5 seconds a 555 timer should give reasonable results... remember to use an extended temp range part for automotive use... Follow the design of the mono-stable configuration as shown here... h
See LM555 Timer circuits the "2 stage time delay circuit" for the basis of a timer I would use in your application, where you need to set an accurate delay time for catching water drops.
You could use a 555 timer i.c. in the monostable mode. The output would switch a relay with more than one set of contacts. One set, in parallel with the button contacts, would close and maintain the power until the end of the 3 second pulse - at which time the whole thing is automatically switched off. The other set of of contacts is fre
Hi cfoek, Check for "555-circuits" or 555 timer/555 monostabil multivibrators & even general: triggered timer circuits...., we have such at EdaBoard too... K. Simplest solution is for you: per switch loaded serial RC element of 1uF & ca2.7MOhm to basis of a transistor, their Collector/Emitter has your relay...
You may want to describe the intended circuit operation more clearly. To my opinion it's hard to understand either from the circuits or your description. Generally, introducing a delay in the said range involves capacitors of about 1000 uF. It can be implemented more easily with active parts, either timer circuits with (...)
Single capacitors quite often don't work well as delay circuits .. Maybe you should consider the very popular 555 timer .. something similar to this: Regards, IanP
Hi captainkirksdog, You don't have to worry about triggering a 555 from a CMOS-level logic source as long as you use a CMOS 555 variant, which in fact is a must if you want such long delays: 1-hour. With standard 250 nA BIAS input currents you won't be able to acquire 1 hour delay without special (...)