terryb.bbs@shark.cs.fau.edu (terry bohning) (02/11/91)
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.
smithj@hpsad.HP.COM (Jim Smith) (02/12/91)
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 Cheap, one-use only, dependable delayed current discharge... ...Sounds like a bomb timer... ...Ever heard of GPS, Brandon? :-)
cas@mtcchi.uucp (2668-Charles A Sherwood(Z550900)0000) (02/12/91)
In article <Z276w2w163w@bluemoon.uucp> 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 Sounds pretty suspicious to me. Lets see ... what is only used once, that should be cheap, and dependable that discharges a current to an external device via two wires????? In this day of terrorism, I would be very reluctant to provide an answer to this question!!!!!!!! -- Chuck Sherwood cas@mtc.com 708-305-3470 Memorex Telex Corporation Indian Hill Court 1000 E. Warrenville Road, Room 1H315 Naperville, IL 60563 UUCP: ...!att!mtcchi!cas or ...!uunet!mtcchi!cas
terryb.bbs@shark.cs.fau.edu (terry bohning) (02/13/91)
cas@mtcchi.uucp (2668-Charles A Sherwood(Z550900)0000) writes: > Sounds pretty suspicious to me. Lets see ... > what is only used once, that should be cheap, and dependable > that discharges a current to an external device via two wires????? > > In this day of terrorism, I would be very reluctant to provide > an answer to this question!!!!!!!! > Why would a terrorist be reluctant to use an IC? For that matter, why is the original poster reluctant to use an IC?
smithj@hpsad.HP.COM (Jim Smith) (02/14/91)
terryb writes:
====
Why would a terrorist be reluctant to use an IC? For that matter,
why is the original poster reluctant to use an IC?
====
Electromagnetic Pulse? :-)
(I know, I know, transistors are susceptible too...)
Look, ya takes a cheep pocket watch, and ya drills a little hole in the face.
Den ya sticks a pointed stick in dere and scrapes a bit a paint offa the
minute hand. Den ya glues a wire in da hole, and sticks a wire on da case.
Den ya connects one wire to da battery, and one wire to de igniter...
(Oh no! Am I giving away State Secrets? Treason!)nagle@well.sf.ca.us (John Nagle) (02/14/91)
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 "One use?" Is this guy building bombs, or what? John Nagle