show your mic
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Tim Gorman
I used an old Motorola hand mic. I just packed the electret element
with a piece of acoustic foam in front and enough behind it to hold it place with the back on. Works fine. tim ab0wer On Fri, 20 Apr 2018 10:54:32 -0700 "Nelson" <ngtdlt@...> wrote: Sorry, I meant to show a picture of the front of the completed mic
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MAX <max@...>
My mic is ugliest of all.
Regards.
Max K 4 O D S.
I've Never Lost the Wonder.
Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jack Purdum via Groups.Io
Sent: Friday, April 20, 2018 9:09 AM To: BITX20@groups.io Subject: Re: [BITX20] show your mic
So you're the guy who read that QRP Quarterly article!
On Friday, April 20, 2018, 10:03:59 AM EDT, Tom Christian <tmchristian@...> wrote:
Gee.... I wonder who gave me the idea for my mic?? :)
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MVS Sarma
I had grabed a taperecorder mic with 3.5mm mono pin.
replaced the cable with 2+shield.had a small pushed switchmounted and wired. repalced the 3.5mm momo pin to stereo pin. Here is a image of my mic.The pp9 battery helps to imagine the mic size. regards sarma vu3zmv
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MAX <max@...>
Speaking of mics, I have to raise my voice almost to the level of shouting to get 5 watts out on 40 meters. Is this normal or should I look for a problem?
Regards.
Max K 4 O D S.
I've Never Lost the Wonder.
Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Mvs Sarma
I had grabed a taperecorder mic with 3.5mm mono pin.
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I simply replaced the element in an old replacement stock CB mike I had with the one supplied in the BitX40 kit. Works quite well.
On Sat, Apr 21, 2018 at 12:57 PM, MAX <max@...> wrote:
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Tom, wb6b
Here is my minimalist microphone.
Surprisingly, the PTT button works through the heat shrink tubing. So, I did not cut an opening to expose it - the button is "weatherproofed".
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MVS Sarma
Max, please check whether the mic body is connected to chasis ground.Regards MVS Sarma
On Sat, Apr 21, 2018 at 11:27 PM, MAX <max@...> wrote:
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Gordon Gibby <ggibby@...>
Three pieces of wood, and cheap momentary contact push button.
On Apr 22, 2018, at 04:43, Mvs Sarma <mvssarma@...> wrote:
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Max,
toggle quoted messageShow quoted text
From board to board there will always be some variation of gain. You can increasing the mic gain by reducing the resistor BITX40 - R123 uBITX - R63 You could try the mic gain control I described recently. You could also increase the drive BITX40 - R136 uBITX - RV1 Raj
At 21/04/2018, you wrote:
Speaking of mics, I have to raise my voice almost to the level of shouting to get 5 watts out on 40 meters. Is this normal or should I look for a problem?
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MVS Sarma
lovely design Regards MVS Sarma
On Sun, Apr 22, 2018 at 3:08 PM, Gordon Gibby <ggibby@...> wrote:
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chris gress <Chrisg0wfh@...>
My basic mic
On Sun, 22 Apr 2018, 11:00 Mvs Sarma, <mvssarma@...> wrote:
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Gary Anderson
In the spirit of fun, here's mine. I can honestly say, I've never seen one like it. Made from three discarded Copenhagen cans, a junk box metric-pitch tactile switch, the supplied mic, a TRS socket, a thin piece of open cell foam in front of the mic, a thick piece of close cell foam surrounding and behind the mic, and one pop rivet to hold the PTT lever. The mic is mounted on a circular plastic disk slightly smaller the the ID of the can which was cut from the third can and drilled to locate the mic. The PTT lever (cut with aviation snips) works surprisingly well, and the mic is comfortable in the hand. The socket allows the cord to be swapped out and possibly a stand in the future, where the mic can be held by a male plug. As far as sound quality, don't know yet.
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I am re-purposing an old microphone from 1944. It is not from a telephone. Any guesses? The original carbon element was bad so I put in a electret mic and MAX9812 module board from eBay that costs a whopping $1.75. I should not need to hold it so close to my mouth to get good audio. Waiting for a new microphone cord to get here next week and I still need to finish my uBITX.
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Frank King
We had mics like that in the control tower at SLC when I started training as an airport traffic controller with the Civil Aeronautics Administration in 1950. Frank King AA7XA
From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Lee
Sent: Sunday, April 22, 2018 7:05 PM To: BITX20@groups.io Subject: Re: [BITX20] show your mic
I am in the process of re-purposing a very old microphone as you can see in they lower picture, FEB 1944. A new microphone cable should be here next week. The carbon element inside was bad so I went for a MAX9812 Microphone on a board for $1.75 on eBay. This microphone was not from a telephone. Any guesses?
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Gordon Gibby <ggibby@...>
fascinating old microhpone!!!
From: BITX20@groups.io <BITX20@groups.io> on behalf of Lee <mr.olson@...>
Sent: Sunday, April 22, 2018 10:04 PM To: BITX20@groups.io Subject: Re: [BITX20] show your mic I am in the process of re-purposing a very old microphone as you can see in they lower picture, FEB 1944. A new microphone cable should be here next week. The carbon element inside was bad so I went for a MAX9812 Microphone on a board for $1.75 on eBay.
This microphone was not from a telephone. Any guesses?
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Praba Karan
My ugly mic made from BSNL landline network box
On Wed, Apr 18, 2018, 4:44 AM Doug W <dougwilner@...> wrote: I am always impressed with the creativity and varieties of solutions this group comes up. Collectively we range from true artists and craftsmen to hackers, kludgers, and cobblers. I proudly spend a lot of time at the bottom of that spectrum. While I am reasonable capable of making things look good with my BITX's I seem to rip things open and apart so often to play with that I am more interested in function than form. With that in mind I stuck my mic and a junk box push button in a prescription bottle connected to a TRRS cable. I know several others have posted pictures of their mic set up ranging from pro quality to junk box art.
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MVS Sarma
P raba jee, Very nice adoptation of data splitter supplied by adsl modems . Perhaps even a phone rossette could be used. "rossette" Regards MVS Sarma
On Mon, Apr 23, 2018 at 11:35 AM, Praba Karan <vu3dxr@...> wrote:
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WOW! That is a neat antique. Might have been a PA or intercom mike back when they used similar ones on a stand for a telephone. I have seen a lot of old telephones like that with the ear piece hanging off to the side. When you picked up the ear piece it went to "Central" and the kind lady there connected you to your desired party. Others had an early dial at the base. Enjoy a piece of history along with the new. Dave K8WPE
On Apr 22, 2018, at 10:04 PM, Lee <mr.olson@...> wrote:
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Gordon Gibby <ggibby@...>
Very cool, and That gives me ideas!
toggle quoted messageShow quoted text
On Apr 23, 2018, at 02:50, Mvs Sarma <mvssarma@...> wrote:
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The microphone is a Model T-32 made by Kellogg Company for military communications. It was sometimes used with the English T-1154 transmitter in WW2 Lancaster bombers. Yes, they were used in many places after the war and one popular use was on a PA system in railroad yards. Since I need 4 wires I am using a Cobra/Midland CB style 4 pin plug and jack with the locking ring.
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