Tom, The 555 will run on 15 volts or higher. It will also run on 5 volts. If the circuit you found has other 5 V only parts simple to get. 7805 regulator.
Whatever you do it would be good if the unit is normally off during normal operation...if relay used have it in de-engerized state. That way not consuming power making life longer. 73, ron, n9ee/r >From: Thomas Oliver <[EMAIL PROTECTED]> >Date: 2008/04/20 Sun PM 06:53:59 CDT >To: [email protected] >Subject: Re: [Repeater-Builder] Need time delay circut > >I thought about the AC Time delay timer but it requires AC 24 volts, it >probably would work off of the ac side of the low voltage transformer but >would still require a relay. I have some of the octal time delay relays I >may use on of them. > >The other thing I ran across was a carrier control timer (time out timer) >from a Mastr II. It looks promising. It has an output that goes low when >ptt is held low after a period of time adjustable from 45 seconds to 2.5 >minutes and runs off 10 volts. > >I also found a 555 timer circuit that will work but I think it needed 5 >volts. > >I will let you guys know if the GE carrier control works. > >tom > >> [Original Message] >> From: sgreact47 <[EMAIL PROTECTED]> >> To: <[email protected]> >> Date: 4/20/2008 7:10:37 PM >> Subject: Re: [Repeater-Builder] Need time delay circuit >> >> Ron Wright <[EMAIL PROTECTED]> wrote: >> > >> > Off the shelf 3 minute delay timers for air conditioners are common. >> > 3 minutes might be a bit long. >> >> A very good solution. Even tho my 'boss' did not like it, I installed >> something very similar on the filament transformer ac line side that >> interrupted the PTT line. One of those 115 vac time delay relay in an >> octal plug housing. >> >> One remote base was set to ten minuets to make sure the AC power was >> stable and the afterburner tubes were well warmed up. >> >> >> >> >> ------------------------------------ >> >> >> >> Yahoo! Groups Links >> >> >> >> >> >> -- >> No virus found in this incoming message. >> Checked by AVG. >> Version: 7.5.524 / Virus Database: 269.23.2/1387 - Release Date: >4/19/2008 11:31 AM > > > Ron Wright, N9EE 727-376-6575 MICRO COMPUTER CONCEPTS Owner 146.64 repeater Tampa Bay, FL No tone, all are welcome.
