RadioBanter - need homebrew microphone ideas/help

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need homebrew microphone ideas/help

I've heard a few hams on the HF bands using homebrew microphones and I thot
they sounded great.
I understand most are made from a Radio Shack (or other source) Electet mic
element, which is inexpensive.

I've searched the net looking for detailed plans on building a mic, but have
only found a few pictures of finished mics. There was an article in QST
showing several mics a guy built. I have a couple ARRL hand books, but
none have info on homebrew mics.

What I need is detailed plans and not the pictures of finished mics. How do
I mount the cartridge? How are the components wired? I have the mic
cartridge and plug for my Icom rig, but still need a mic cord a few feet in
length. How many conductors should the mic cable have? I saw somewhere
the needed voltage is obtained from the rig, but a resistor may be needed.
A capacitor or two is also needed and possibly a mic pre amp??

Perhaps someone in this newsgroup has built a mic and can give some help.

Thanks and 73

Roln

Check out the upcoming December issue of QST....I believe there will be an
article describing the construction of a homebrew mic by Sam Kennedy KT4QW.

Dino KL0S/4

I've found lots of pictures of homebrew mics on the web, but I need info and
pictures on HOW to build one. Detailed instructions is what I need.

Roln

"KLØS" wrote:
Check out the upcoming December issue of QST....I believe there will be an
article describing the construction of a homebrew mic by Sam Kennedy
KT4QW.

Dino KL0S/4

Roln:

The last electret element I bought from Radio Shack had the wiring diagram
for it printed on the back of the blister pack card.

For your radio, look in the owner's manual. It should show the microphone
connector pinouts. Most modern HF rigs have DC available (8 volts or so) on
one of the pins.

The mic cable will need enough wires for:

1. ground (may use the shield on #2)
2. audio (shielded)
3. PTT (push to talk)
4. DC voltage to operate the electret element

Radio Shack may also carry the 8 pin microphone connector that is compatible
with yaecomwood radios.

GL and 73,

Roger K6XQ

http://www.qsl.net/kk5dr/micamp.html
http://www.reconnsworld.com/audio_electretamp.html
http://www.ee.washington.edu/circuit...ts/micamp.html
http://www.qsl.net/kk5dr/EQ.html

I hope this helps i bit..

73's
http://www.qsl.net/sv1hao

"Roln" wrote in message
news:NUQlb.8001$Fm2.7194@attbi_s04...
I've found lots of pictures of homebrew mics on the web, but I need info
and
pictures on HOW to build one. Detailed instructions is what I need.

Roln

"KLØS" wrote:
Check out the upcoming December issue of QST....I believe there will be
an
article describing the construction of a homebrew mic by Sam Kennedy
KT4QW.

Dino KL0S/4

I get lots of compliments on my audio, using a "computer" head set that uses
an electret mic. You can spend up to $15 at R.S. and get a nice one. At
the local big box electronics store, I saw sets with leather like ear pads,
or foam ear pads. I borowed a Labtec from a friend and tried it out and was
happy with that as well.

I find it much easier than using a desk mic. Since your mouth is always the
same distance from the microphone you can have better audio and not have to
play with the Mic Gain on your radio very often.

You can see the one that I use on QRZ or at
http://user.mc.net/~jdewey/Ham_radio/ka9car.jpg

One of the Ham Radio Magazines ran an article in the last couple of years,
showing how to use plastic pipe fittings to mount the element and make a
desk stand.

I have used my "desk mount" Sound Blaster microphone, You can get them at
ham fests or flea markets for $3.00 or buy a replacement at your local big
box electronix store for about $10.00

Here is a schematic of how I added the proper voltage to my radio.

http://user.mc.net/~jdewey/KACHINA/E...t_mic_bias.jpg

Those PIN NUMBERS apply ONLY to a Kachina 505DSP.

I used the same head set in My Alinco (DX-77T), There was already a power
supply on the board all I had to do was install a jumper to liven up the
mic. Most ICOM radios are powered.

Good luck.

JD