radio control switch

Thread Starter

electronis whiz

Joined Jul 29, 2010
512
i have some circuit boards from a fax machine. there is a relay that runs when the talk buton on hendset is presed there are 4 boards i am trying to put it all on 1 small board but there are alot of chips for the radio reciever is there a way to just make a transistor circiut to get the signal and activate the relay. any ideas or sugestions apreceated.:confused:
 

beenthere

Joined Apr 20, 2004
15,819
i have some circuit boards from a fax machine
What are they supposed to do?

there is a relay that runs when the talk buton on hendset is presed
The press-to-talk button probably makes a current path through the relay coil.

there are 4 boards i am trying to put it all on 1 small board
What are the functions?

As to the RF remote, it might be simpler to get a remote unit like the one at the link - http://www.lightinthebox.com/2CH-RF...-Switch--AC-Power-H290409299398-_p104179.html Simpler because radio frequencies are tightly controlled, so picking one at random can cause problems with the FCC.
 

Thread Starter

electronis whiz

Joined Jul 29, 2010
512
ok thanks that helps the one board is for the relay and phone line comes in and has the ic for the antana then that goes to another board for power and some other ics and the relay runs off of a small transistor controled by this other board. there is a small swithcing psu and a board for the hanset holder to charge it. i will try your link thanks. i am looking for a relay with normal open and a normal close.
 

Thread Starter

electronis whiz

Joined Jul 29, 2010
512
i have looked at your sugestion. and it is better than what i hoped to make. do you know if the relays are normal open or normal closed. also i was hoping to power it from battery voltages eg 6-14 volts. will this work.
 

beenthere

Joined Apr 20, 2004
15,819
The application is in a car, so 12 - 14 volts should do fine. The specific receiver will have the details as to relay contacts. Probably most are NO.
 
Top