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From: terryb.bbs@shark.cs.fau.edu (terry bohning)
Newsgroups: sci.electronics
Subject: Re: timer
Message-ID: <80u7w1w163w@shark.cs.fau.edu>
Date: 11 Feb 91 05:18:54 GMT
References: <Z276w2w163w@bluemoon.uucp>
Sender: bbs@cs.fau.edu (Waffle BBS)
Organization: Florida Atlantic University
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levi@bluemoon.uucp (Brandon Moore) writes:

> 
>    Could anyone suggest a _cheep_ timer circuit for me?  By cheep I mean, 
> an inexpensive, one-use only design, using cheep parts and no IC's, but 
> still being fairly dependable.   Technicly, I need a timer which gives a 
> delay after a mechinism is activated (pushed, turned, etc.) before 
> discharging a current through another circuit attached by two leds.
>  
> Levi

Of course, the obvious choice is a 555 timer chip, but you said no ICs.
Otherwise an old favorite is an RC circuit charging to a unijunction
transistor's standoff voltage which in turn fires an SCR to provide
latching action.