Tag Archives: microphone

Balanced Microphone Amplifier

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We published a design for a stereo microphone preamplifier with balanced inputs and a phantom power supply. The heart of this circuit was a special Analog Devices IC, the SSM2017. Unfortunately, this IC has been discontinued. In its place, the company recommends using the pin-compatible AMP02 from its current product… Read more »

Quality Stereo Wireless Microphone or Audio Link

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This stereo FM wireless microphone also makes a great quality audio link. We tested it to beyond 50 meters and it was rock solid. It’s certainly not the first wireless microphone we’ve ever published but this one is a little different. It’s stereo, providing surprisingly good quality sound. Second, it… Read more »

Condenser Mic Audio Amplifier

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The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier. Resistor R1 provides the necessary bias for the condenser… Read more »

Spy Ear

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What binoculars do to improve your vision, this personal sound enhancer circuit does for listening. This light-weight gadget produces an adjustable gain on sounds picked up from the built-in high-sensitivity condenser microphone. So you can hear what you have been missing. With a 6V (4×1.5V) battery, it produces good results…. Read more »

Preamp Stage For Ceramic Phono Cartridge Or Violin Pickups

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While we have published a number of variations on a standard RIAA preamplifier for magnetic phono cartridges, we have not published a preamp stage for ceramic phono cartridges. Typically, these were supplied as turnover cartridges in record changers but there were higher quality versions such as the Decca Deram. These… Read more »

Room Recorder

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My wife was working on a doctoral dissertation and needed to do some field work involving personal interviews in various settings. What would be the best way, technically speaking, to record the interviews? To pass a tape recorder or microphone back and forth seemed too awkward and clipping wired microphones… Read more »

Microphone For Computer

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Buying a microphone for a computer is costly. Especially when there is a need to have two microphones—one for modem and another for sound card—or if the present microphone is not working properly and needs to be replaced, you are likely to feel the burden of extra cost. Here is… Read more »