Ron...That is exactly what I could use as long as it had some type of light to let the person know that the board has been enabled.
Rich --- Ron Wright <[EMAIL PROTECTED]> wrote: > > One can get push button switches that latch on when > pushed/latch off > when pushed again. IF you want just digital mode > while switch is > pressed then no problem. If you want to make sure > the radio stays in > analog until commanded requiring the op to hold > during digital then a > momentary switch can be used. > > A "flip flop" or D-Type latch like the 74LS74, a 30 > years old part, can > be made to work, but unless you are driving with > some electronics to > automatically change between digita/analog it would > be over kill. Also > sounds like the latch is still going to a switch to > flip the flip-flop > and with switch bounce one would need a de-bounce > circuit. A 74LS123 > one shot is good for this. However, still over > kill. We could also do > with a CPU like the PIC processors, etc. Fun to > work with and would > learn something, but WAY OVER KILL, hi. > > A switch is easy no brainer here unless there are > othe issues. Requires > no power, just some wiring and about every type and > size of switch one > can imagine is on the market. > > 73, ron, n9ee/r > > > > > On Sun, May 11, 2008 at 8:22 PM, Rich Summers > wrote: > > I can't use a toggle switch because the contact to > enable the scramble board needs to be momentary to > turn on the board and then a momentary contact to > switch off the board. This contact will be using an > enable wire from the board and another wire that is > a > ground. I think a flip flop MAY be the way to go. I > was also wondering if there is a push button switch > that has 2 spst contacts? > Thanks. > --- MCH < [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> > wrote: > > > For that matter, why not just a toggle switch? > > Joe M. > > Rich Summers wrote: > >> I need to build a simple circuit to enable a > voice > > scrambler in a radio. > >> What I need is a momentary contact by pressing a > > button so that the > >> activation lead goes to ground and when this > > happens I need an led > >> indication that the unit has been activated. I > also need the led to > >> turn off when the button is > > pressed again. This > >> deactivates the board and the radio returns to > > normal mode. > >> I need this in a small box. Does anyone have a > circuit I could build > >> for this > > particular application? > >> > >> Thanks, > >> Rich > >> > >> > >> ------------ --------- --------- ------ > >> > >> > >> Yahoo! Groups Links > >> > >> > >> > >> > > > > ____________ _________ _________ _________ _________ > _________ _ > Be a better friend, newshound, and > know-it-all with Yahoo! Mobile. Try it now. > http://mobile. yahoo.com/ > ;_ylt=Ahu06i62sR 8HDtDypao8Wcj9tA cJ > <http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ> > > <http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ> > > ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
