Hi there folks, I had been planning to build a small intercom, with the intent of linking it up from my babies nursery room to the living room, via 2 way wire.
I searched the net for suitable schematics, found the following one at this page.
http://www.circuitstoday.com/transistor-intercom-circuit
i made 2 twin circuits using 2 X 0.5w 8ohm speaker, an 2x electret condeser mics
I found difficulty obtaining a BEL187 Transistor but noticed in the notes the designer stating it could be substituted using a S8050, which is what i done.
After setting both the Circuits up and wiring, Iv found they do work as described, the push button creates a buzzer/ring type sound on the opposite speaker when pushed, however when in talk mode there is only a faint sound of tiny volume being transferred at the other end, the mics only seem to be picking up small amount of sound in the room but no voice, im asuming it is not the speakers as the buzzer/ring is as loud as its supposed to be, and as said there is a small amount of volume coming through at each end, for example a slight noise is heard at the opposite end if the electret mic is tapped or blown into, just no voice ??? its really confusing me.
does anybody have any suggestions where i could have gone wrong.
this would be much appreciated
cheers