Gmi Pro
CB Microphone wired to Phono Plug?
100b I have an old Shure mic series you want to use for recording and am having problems. There are four cables, two of them are for the PT and is not required for use, so I have two cables, one hot and one ground I assume. I have to plug RCA cable, but does not work unless I actually touch the microphone element. like I used as a reason. I am testing the box, which is metal. Not sure what is happening, but herer is a pdf. which shows the circuit diagram at the bottom. http://www.shure.com/stellent/groups/public/ @ GMS_GMI_WEB_UG/documents/web_resource/us_pro_101c_ug.pdf any help is greatly appreciated.
You did not say whether they were recorded on a computer, or audio equipment. According to the pdf, that Mike has a granule microphone element coal, which is commonly used in old radio phones and old equipment. View: http://www.aerialpursuits.com/comms/mikes.htm Now, computers use electret condenser microphones and professional audio using refrigerant or other more advanced designs of microphone, which will bring very low sound levels, usually in the range of a few mV or less. They require a pre-amp for most applications - a computer sound card has a preamp built in. However, carbon microphone requires an external voltage to power, a bit like an electret, and its output voltage is a significant percentage of the input voltage (thus, if you put 5 volts through the carbon microphone, its output signal is about 5 volts maximum). This means that the microphone is using CB needs an external power source, and its signal will thus be higher than the average microphone. As for this type of article. He used a microphone from an old phone, but is the same type of microphone is band radio: Your solution is http://www.instructables.com/id/Telephone-Handset-Microphone/ to add a single battery (1.5 volts), adding some resistance to keep the tension down, and feeding the resulting signal line connectors instead of the microphone jack (since the signal will be approximately 1 volt or less, the microphone, which is closer to the levels of line the micro levels. I think if you've added to your solution to your microphone, it should work. As for why it works when you hold ... I think your body may have been the provision of a few millivolts with the microphone, and this was enough for the microphone generates an output of a few millivolts, which is fine for a microphone input jack, but probably less than what you need to get sound from that mic. Maybe you can experiment with the micro-power that comes from the card PC sound, or touch a USB cable to get 5 volts, voltage applied to the microphone, use and reduce resistance to line levels. If you have access to food phantom, you can try the same thing. The current specifications pdf mentions that takes the CB microphone, for use as a guide to activate the microphone.
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