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soundmanjim Profile
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Registered: 01-2008
Posts: 230
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EXTERNAL MIKE / AUDIO EQUALISER


Just thought i would tell you about the plug in audio break out/brek in box ive just thrown together.

I had an old echo box, which had a trailing 4 pin connector and 4 pin socket on the front plus a vol control and a listn jack.

What i have basically done is this -

taken all the guts out of the box.

wired in two balanced jack leads to go to the in and out of a 31band graophic equaliser

wired the mike in and mike out so they work with the edx, and am in the process of making the switch mute the mike insert in the standard nike and replace with the audio of the seperate xlr connector i have, which is connected to an SM58, allowing you to use the ptt of the standard mike.

I will fit in an extra ptt line so you could connect a footswitch, leaviung your hands free to play with your pc.

if this works (and it seems to be fine so far) im going to buy some boxes and build some interface boxes, which i can make to suit your particular rig.

would anyone be interested?

basically, you unplug your rigs mike.
then you plug in the trailing lead from the interface into your rig.
then you plug your rigs mike into the front socket.

now, like this, you can key the mike and talk as if nothings happened.

then, if you want to put an effect or a compressor in line with the standard mike, you simply plug the unit into the loop sockets (which i'll mount at the back) and then when you now key the mike, youll have the standard mikes audio going through any manner of effects you can care to connect.

Also, i will include two 3.5mm jack sockets (one line out, one line in) so you could connect one to an ipod or external audio device (to play back someones audio to them, for example) and connect a minidisk recorder or other device, such as yet another eq for recieve audio.

the box will be about the same size as a standard cb rig and fit on the top or the bottom, so it looks cool.

no idea how much its going to cost - but i see MFJ make something similar to this that retails at about £229 - mine wont be a third of that.

Obviously, it depends how expensve the equipment you connect to it, but you can pick up yamaha mono 31 band graphics for around £40 sovereigns.

you could go mad, spend £60 and get a s/h behringer fx unit and experiment with very long reverbs and delays. LOL. you could even connect a miing desk to the input, then connect absolutely anything you like to your rig.

anyhow, if anyones interested in me knocking these units up, let me know so i know how much gear to buy.

remember, these units will have an XLR socket on the FRONT of the unit so you can just plug a studio mike straight into your rig.

perhaps ill even include a phantom 48v supply to the front so you can use a really nice studio condenser as your base mike.

the xlr sockets are about a £1 each, the boxes should be about £5, ive got a big reel of small balanced lead here, so i wont need to buy that, plus i have tons of PA gear i can connect.

if i charge £30 to build each one, i reckon we cant be looking at more than £50 for each unit.

thoughts, etc?



Last edited by soundmanjim, 10/Mar/2008, 6:54 pm


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yamanx1 Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


Jim, I have a Sure SM58 coming (I hope) also a cheap audio mixing console XENYX 802.

What can I do with these?

How is the mike keyed, if not using vox?

The Icom uses power from the radio to power the microphone, how do I cope with this if adding audio equipment?

The mixing console or microphone does not appear to have any kind of powered amplification, does this matter? Or would an amplifier of some description be required?

And how on earth is all this set up once connected, if it can be?

emoticon

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soundmanjim Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


blimey.

i asked for this didnt i. LOL.

ok.

Connect the sm58 to the xenyx (nice little mixer actually) to one of the channels with a balanced input - i.e. the hole with three small holes in a v shape). You can use a jack socket but i would use the balanced jobbie pureley becuase it works better and you wont get any buzzing or interference on the mike that way.

Connect the output of the xenyx to the rigs audio input.
i would do it by making one of my boxes up that allows you to use your standard mike as the ptt.
On the one i have built myself, i used the power switch as a mike switch so in the up position, the fist mike works as normal, and in the down position the fist mike is muted and audio is routed through the external effects or, in your case, the xenyx, but the ptt on the fist mike still works.

As your using an icom, you have an easier way of connecting external audio - if you are on a 735 or 706, there is an accessory socket in the rear of the radio, and you should have the matching connector to go in it without anything soldered into it. If you havent, call icom at herne bay in Kent and they will send you one for a few bob.

there is a pinout for the icom acc connector in the back online somewhere - i cant get my pc to open links for some reason today!!

then, you can rig up a ptt switch yourself using a good quality push to make, push to break switch and parallell that with a push to make, release to break switch so you have one switch for long overs, one for short bursts.

its not too hard to rig this all up on the front mike connector. (bit more awkward on the 706 as you need OPC-589 which is the 8 pin to modular adaptor, then use an 8 pin plug to fashion your connection - you only need to know which pins take the audio - paying special attention to which is ground!)

Anyroad - when playing with icoms you need to TOTALLY AVOID PIN 2 and pin 8 (speaker out) - short these and its curtains for the radio!!

basically you will have to knock up a plug to connect to the MONO output of your mixer - (preferably balanced, i.e. three connections, which will prevent any rf feedback and buzzing etc) and connect this to the audio in on the front of the rig.Ptt wise, you could cheat by using a morse key as a switch connected to the ptt keyline - aghain, you need a good diagram of the pinout of the icom 8 pin connector. Assuming youvbe got an icom with a round 8 pin connector.

The XENYX has a gain control on each channel - these are whats known as 'head amps' and are an amplifier in themselves.

as i said, its a bit difficult to describe here how to connect all your gear together unless i have more info - like the exact model of xenyx mixer, and the exact model of radio (cant remember)

get back to me on this.

If it looks like a lot of hard work, i can knock up an interface box for you.



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11/Mar/2008, 11:50 am Link to this post Send Email to soundmanjim   Send PM to soundmanjim MSN
 
soundmanjim Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


ic 735 mike pinout

Pin 1 – Mic Input
Pin 2 – N/C**
Pin 3 – N/C
Pin 4 – N/C
Pin 5 – PTT
Pin 6 – GND
Pin 7 – GND
Pin 8 – Speaker**

**Speaker audio (usually Pin #8) and power (usually Pin #2) are available on some models. Check your radio manual for availability of these signals and add the appropriate jumpers.

i have no idea which GND is audio GND or PTT GND!!


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yamanx1 Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


Thanks Jim, I'll give you a shout in a while when all the bits arrive emoticon Mixer model is 802.

I though my mic had a six pin plug? Also it does have the power from radio to mic. I'll dig the manual out.

Cheers

Dave

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soundmanjim Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


K

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soundmanjim Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


additionally ive got some reports off of cb/27/81 and im getting some very complimentary reports about my audio - 'bbc quality' and 'sounds like radio 2' being some of the nicer remarks!! i nwonder if the icom would respond as well to the mike treatment? i doubt this as the bandwidth of the edx is a bit wider than the icom, allowing for better audio.
so im quite pleased!
All i need now is a bloody 200 watt linear to get over all the idiots on the 19!!


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26fb139 Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


what we looking at for a mixer for a kenwood 870 sat jim,mike mc60,iam also considering buying a marshall studio mike,as good as a heilo,bellringr,but a lot less dollar???
you asked????
ps slash plays a brillant version of deep purples "wish u were ere" never into em???

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soundmanjim Profile
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Re: EXTERNAL MIKE / AUDIO EQUALISER


blimey how long is a bit of string? lol. the trouble is, the price of some of these small mixers vary so much - i personally WONT entertain a bloody behringer desk as A/ they are CRAP and B/ they are CRAP.
I would go for a small size soundcraft or mackie jobbie - there a re a few other companies making small size mixers that would do the jb -shop around.
Yamaha are also good.

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Re: EXTERNAL MIKE / AUDIO EQUALISER


OK Jim, I've got most of the kit, Shure SM58 mic and the Behringer XENYX 802 mixer, I've ordered some leads, plugs and stuff should arrive tomorrow.

I've found a neat little limit switch which will be perfect for keying the mic emoticon

Just need to set it up, I'll be asking questions no doubt emoticon

Because the mixer has four ins and four outs, and the mic just uses one of them. I'm going to use one of the others for the sound out emoticon Thats ok to do this? There are two 1/4" output jacks I can use one for each? And I only need mono as well?

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