OK this is starting to drive me crazy... how hard can it be.
I'm am trying to wire a mic to a CB, I got the PTT connected transmit connected but when I connect audio wire I get a high pitch noise
Yellow wire is Audio right?
I'm really confused and its starting to p me off.
Can somebody please help I've got a diagram but its not helping. I'm wiring it from the leads because I can not get the actual mic open because the screws are rusted, I don't have time to wait to order a replacement mic America is coming in and I want to make contact so I'm trying to get this mic connected in anyway I can.
Thanks.
CB Mic wiring
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Re: CB Mic wiring
Thanks for the help... I really don't know. Its a Maxcom CB not listed. I can't get any bloody mic working just high pitched noise as soon as I connect a mic piece. 4 wires 2 for PTT and two for mic but I guess not. I give up with it.
Why is it so complicated.... I'm p-ed off and it sounds like the skip has gone either that or I've killed the receiver trying to get a sodding mic working with it. Two grounds I just don't understand.
I have shield
Red
Black
Yellow
Where do these wires go? Please can somebody help.
Nope I've killed the f**king RX on the radio I'm so p*ssed off now.
Why is it so complicated.... I'm p-ed off and it sounds like the skip has gone either that or I've killed the receiver trying to get a sodding mic working with it. Two grounds I just don't understand.
I have shield
Red
Black
Yellow
Where do these wires go? Please can somebody help.
Nope I've killed the f**king RX on the radio I'm so p*ssed off now.
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Re: CB Mic wiring
In a way you are correct. Two of the wires when shorted together put the unit into transmit. When it is transmitting and you are listening on another radio, touching one of the two remaining conductors should generate a buzzing sound when you touch the end. This is the audio signal, the remaining one would be either a return, or possible a return AND ground. Other radios might share one of the PTT lines with ground, but others absolutely don't. There is no standard and there is no colour code. Makes all differ.If you take the two audio lines and twist them together, shorting them, you should transmit silence - with no hums or buzzes. If this works, then co0nnecting these to the mic will work - BUT - some mics use dynamic capsules, and these don't care which way around they go but some smaller mics use electret condenser capsules and they need a polarising voltage to make them work, so getting the two audio lines the wrong way around will not work.
Re: CB Mic wiring
Thanks for the info. I touched the yellow wire and get the buzzing sound so that is the audio wire but when that is connected to the mic piece with a ground, when I key up I get a very loud squeal... no matter what I connected which way instead of getting audio I get the loud feedback squeal and I think I've buggered the receiver on my CB... I had America blasting through loud and clear for hours and since the I keyed the mic when I got the loud squeal I'm no longer receiving anything just white noise.paulears wrote: ↑22 Oct 2024, 20:20 In a way you are correct. Two of the wires when shorted together put the unit into transmit. When it is transmitting and you are listening on another radio, touching one of the two remaining conductors should generate a buzzing sound when you touch the end. This is the audio signal, the remaining one would be either a return, or possible a return AND ground. Other radios might share one of the PTT lines with ground, but others absolutely don't. There is no standard and there is no colour code. Makes all differ.If you take the two audio lines and twist them together, shorting them, you should transmit silence - with no hums or buzzes. If this works, then co0nnecting these to the mic will work - BUT - some mics use dynamic capsules, and these don't care which way around they go but some smaller mics use electret condenser capsules and they need a polarising voltage to make them work, so getting the two audio lines the wrong way around will not work.
Is it possible to fry the receiver on the radio by connecting the wrong mic wires together?
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Re: CB Mic wiring
Yes, if you accidentally connected the PTT hot wire to the audio input, it is quite possible to damage the preamp. Probably too late now, but a cheap meter would show you which is the hot one, before you randomly exoeriment.
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Re: CB Mic wiring
with most cb's when you press the mic ptt button, the ganged switch inside usually disconnects the rec audio to the speaker and connects the tx audio to the mic pin, if the mic isnt wired to do that you will get feed back squealing.
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Re: CB Mic wiring
I hadn't buggered the receiver after all... conditions just happened to drop that night plus some of those state side are running crazy power so it can seem like things go dead when the big power stations stop transmitting... I had it on this afternoon and it was receiving nicely but I still couldn't get a mic wired to it, so I just used another radio instead to get out to the states.