What is the use case? Timer?
ryan -- D. Ryan Spott | Iron Goat Networks, llc broadband | telco | colo | community PO Box 1232 / 603 W. Stevens Sultan, WA 98284 360-799-0552 | gtalk:rsp...@irongoat.net > On Jan 9, 2015, at 07:06, Christopher Tyler <ch...@totalhighspeed.net> wrote: > > Maybe use an Arduino? Cost would be about $29 for a name brand one. Takes a > little more programming but is reusable and your circuit engineering would be > minimal. > > -- > Christopher Tyler > MTCRE/MTCNA/MTCTCE/MTCWE > Total Highspeed Internet Services > 417.851.1107 > > ----- Original Message ----- > From: "Mark - Myakka Technologies" <m...@mailmt.com> > To: "Rory Conaway" <af@afmug.com> > Sent: Thursday, January 8, 2015 8:31:44 PM > Subject: Re: [AFMUG] OT - EE help please > > Rory, > > liking the 555 for now. Any other suggestions welcome > > > -- > Best regards, > Mark mailto:m...@mailmt.com > > Myakka Technologies, Inc. > www.MyakkaTech.com > > Proud Sponsor of the Myakka City Relay For Life > http://www.RelayForLife.org/MyakkaCityFL > > Please Donate at > http://main.acsevents.org/site/TR/RelayForLife/RFLFY12FL?team_id=1030009&pg=team&fr_id=37555 > ------ > > Thursday, January 8, 2015, 8:34:53 PM, you wrote: > > RC> Another option is 555 IC's, very easy to work with and a million circuits > out there. > > RC> Rory > > RC> -----Original Message----- > RC> From: Af [mailto:af-boun...@afmug.com] On Behalf Of Bill Prince > RC> Sent: Thursday, January 8, 2015 6:25 PM > RC> To: af@afmug.com > RC> Subject: Re: [AFMUG] OT - EE help please > > RC> Make something simple with 3 binary timers > RC> > (http://www.radioshack.com/nte74ls163a-ic-ttl-binary-counter/55051075.html#q=counter&start=1). > > RC> So you would need an oscillator. You can make one with a > RC> couple of cross-coupled transistors or just use a couple of > RC> cross-connected flip-flips. > > RC> Feed the timer into each of the counters that is enabled by > RC> each switch plus the output of the previous counter. If the > RC> counter overflows before the next switch is pressed, then nothing > RC> happens. > > RC> That make sense? > > RC> bp > RC> <part15sbs{at}gmail{dot}com> > > RC> On 1/8/2015 5:09 PM, Mark - Myakka Technologies wrote: >>> I'm working with some kids on a school project. They want help with a >>> simple circuit design. Bare with me as I explain this. My circuit >>> design skills are VERY basic. >>> >>> We will have 3 momentary switches (1 2 3). If they are pressed and >>> released in the order of 3 2 1, we need it to trip a relay and keep it >>> tripped for about 4-5 seconds. Any other order and the relay stays >>> closed. Also, there should be a reset timer such as if 3 and 2 are >>> tripped, but nothing happens in x seconds system resets. >>> >>> This will be running off of 4 AAA or 4 AA batteries. This device will >>> be used for 5-10 minutes at a time. >>> >>> I'm trying to keep it basic as possible. These are 6 & 7 graders with >>> zero electrical knowledge. If the circuit get too complicated, their >>> eyes will just glaze over. >>> >>> I was thinking about something with capacitors. I know they store and >>> release energy and have some timing specs. > > > --- > This email is free from viruses and malware because avast! Antivirus > protection is active. > http://www.avast.com >
