I put together this mini FM transmitter. But I can never hear the audio that should be coming through. I don’t know that much about this type of thing, but I took the mic I got it at Radio Shack and tried to hook it up directly to a speaker using several different schematics I found for electret mics. All I got was nothing except for when I attached the battery I can hear the speaker flutter a bit. Does this mean I have a bad mic or am I just not hooking it up properly? Microphones, even when they are working properly, only generate a very weak signal. They require amplification in order to be heard on a speaker. Have you tried powering the FM transmitter with a known-good source of signal, such as the output of a CD player? That could help you determine whether the problem is with your microphone circuit or with your mini transmitter.
Connecting microphone to stereo amplifier
Audio Frequency AF Transformers work at frequencies between about 20Hz to 20kHz and are used in audio amplifier circuits, they were essential in valve tube designs for matching the high impedance outputs of theses amplifiers to low impedance loudspeakers, but transistor amplifiers have much less need for output transformers.
AF transformers are still produced however for a range of audio functions; many are similar in construction to the power transformers described in Module Some common arrangements of audio transformer windings are shown in Fig Some transformers may also have tapped primaries for an even wider range of ratios. The dots near the windings on schematic diagrams indicate the relative polarity of the signals on different windings, and in this example show that the signal from the upper secondary winding A will be in phase with the primary signal, while the lower secondary winding B will provide a signal in anti phase with the primary signal.
Audio transformers often perform several functions at once:
Most Dell notebook computers have a built-in microphone to use with various programs, such as Sound Recorder, Windows Speech Recognition or Voice-over-IP software. Dell desktop computers do not include a built-in microphone, but offer a microphone jack .
Andy aka k I’m a bit shaky on your proposed solution. Even with a built in FET, electret mics typically have an output on the range of mV according to all my research, so it seems like I’m going to need some kind of amp to get it up to 0. The original thought was that although the small amplitude signal will get fed back via R1, it will also feed through the transistor base, creating a much larger amplitude signal through R2 and the transistor, which then gets tailored to the proper amplitude via the voltage divider and put back on the line.
Am I way off base here? I’m don’t mean to be difficult here, just trying to understand. Even if this circuit won’t work and I believe you when you say it won’t I will still need some kind of amplifier, won’t I? Is it possible to power said amp using the same phantom power as the mic or do I need a separate supply? Put maybe ohms in the emitter and split the 10k to the base into 2 x 4k7 with the centre point connected to ground with a uF capacitor.
This may work BUT so might just trying the mic directly.
How to Connect a Microphone to a Security Camera System
Buy Now Simple, reliable, and portable. This simple, handy little recording interface has just the right features for basic recording needs, allowing you to plug in and start recording right away. Buy Now Just the right size. Simply connect a couple of mics and you have an easy-to-use stereo recording system. A mix control lets you control the level between the input signal and computer playback, without hearing annoying delays.
The result is a simple, affordable, mobile recording solution.
Jun 25, · In the video I discuss the Apex ‘s (stereo matched pair with mic holders, extra Omnidirectional & Cardioid tips, foam wind screens and case). Killer little mic pair for under $
Lindy Sisk Long ago, in a universe far, far, away Oh, wait, wrong story. We have a set of 2 handheld wireless microphones. This is a set of instructions about how to hook them up to a portable boom box. Plug the AC power strip into the a wall socket. Unpack the Freeboss receiver, and plug its power adapter into the AC power strip, and into the 12 V. Do the same for another wireless microphone receiver, if one is being used.
Click here for larger image. This form of microphone connector has been around since World War II. The basic design for this style of connector has roots in the design for a plug and jack set used with headsets. The headset plug diameter was only a two circuit plug sleeve and tip and 0. This headset plug design was in common usage in at least a couple of decades before the “microphone” plug came along.
While Listen is checked, your microphone will be audible through your speakers, and in a more advanced facet, through stereo mix. So if you wanted to record your Mic and Stereo Mix, this is how you would do it, but at the expense of being able to still hear your mic (it throws most people off, like myself).
Next Whether you’re recording a podcast , musical track or field recording, you want to ensure that your audio is crystal clear every time. Condenser microphones are an excellent tool that delivers high sensitivity to capture subtle nuances and smooth frequency response [source: Whether you’re plucking, drumming, singing or speaking, condenser microphones create high-quality audio. Read the steps listed below and learn about how to use a condenser microphone on your computer.
Ensure that your microphone software has been properly installed on your computer. Follow the instructions provided with your hardware, when installing the software. Set your microphone close to your computer. You will want the microphone to be 4 to 16 inches 10 to Make sure that your space is void of any disruptions that may distort the sound [source: Set the microphone’s pattern switch to Cardioid.
This will ensure that the microphone is picking up the sound coming directly at it, as opposed to sound from the sides or back [source: Make sure that the front of the microphone is facing the correct direction. Connect the headphones to the microphone by plugging the cable into the output marked Phones.
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You would need to connect that to the microphone input of the RasPi and devise some software to take the microphone signal and integrate it into the sound level envelope. You might as well just get a cheap electret microphone, such as Sparkfun’s , and use it directly in whatever circuit you put together. Analog logarithms are the way to go here One of the ground truths of modern, cheap ADCs, especially the ones provided on highly integrated systems, is that their dynamic range is limited by noise on the low end and the low supply voltage available on the high end.
Furthermore, taking your logarithms digitally makes poor use of the ADC bits you have available to you — small changes in signal at the low end cause a relatively large change in the log, but are hard for the ADC to distinguish due to its limited resolution.
The SparkFun MEMS microphone breakout board is a simple and easy-to-use microphone for a variety of sound-sensing projects. The on-board mic is an ADMP, which is a low-power, omnidirectional microphone with an analog output. It works for both near and long-range uses and is .
It comes with a single 3. The laptop will work fine when outputting sound through the jack and a pair of headphones. However when i try to use the same port as a line in to record sound from an external device i am having some problems. It just says ‘not plugged in’ under the microphone. After doing some research I found that the lead I was using, a 3 section plug, would not work and that was the reason there was no change when i plugged it in.
I thought my problem was sorted but this was not the case at all. This makes no sense to me whatsoever?!? How can it recognise the lead is plugged in with no problems but then go back to not recognising it as soon as the other end is plugged into an external output?! Surely there must be a way of rectifying this as currently its impossible to record any sound on the laptop from an external device, in this case, my mixer. The main reason I bought this laptop is so I can record the mixes I do.
It is literally of no use to me with this problem. I had no issues with this on my old laptop as it had separate 3. Please can someone advise me of a way around this problem.
How do I hook up a wireless microphone receiver to a stereo (red/white) mixer plug?
Follow these simple instructions and you’ll be wireless and hands-free in minutes… Setting up your Plantronics CS Series Headset Unplug the coiled receiver cord from your phone base detach the handset from the jack at the base end of your phone. Plug the flat black connector cord that is already plugged into your Plantronics CS Headset System base into the jack where you just unplugged your telephone handset.
The jack is located below the headset base facing forward, allowing you to easily answer and end the phone without use of the headset. If you’ve tried the above without success, please call our Headset Advisors at
How To Connect a Microphone To Your PC Computer, Laptop, Mac or iPad. How do you connect a mic to record? Whether you play, sing or make vocal recordings, then if you want to record we tell you how to hook up the microphone.
Power Supplies A constant current source source can supply a fixed current to a load regardless of input voltage or load change. The LM is quite useful as a constant current source, works on a wide input voltage range, from 3V up to 40V. The circuit is rather simple, uses only one transistor and few passive components and performs well in terms of frequency stability, almost zero drifting after about 4 hours of continuous operation. With 12 volt DC it will deliver 1 watt RF power.
The most important parts of the oscillator are the transistor Q1 and the tuned circuit, which comprises the inductor Ll and the variable capacitor CV1. When the battery is first connected, a brief surge of current flows from the collector to the emitter of Q1, causing an oscillating i. An oscillating voltage therefore appears at the junction of Ll and CV1. The frequency of the oscillation depends on the values of Ll and CV1, so that varying the value of CV1 tunes the oscillations to the exact frequency required.
In order to achieve a high output level, you will need a well tuned antenna, and a large heatsink to dissipate the heat from T2 transistor. Transmitter was mounted in metal enclosure and works extremely well. Test and Measurement I finally got round to making my capacitor ESR tester this week after finding a nice simple 5 transistor version.
Checking the headphones or headset Check the following issues to troubleshoot headphones or a headset: If the device came with software, make sure it is installed properly and is compatible with Windows 8. If the device operates on battery power, make sure the batteries are correctly seated and are functional.
Adding a microphone and headset to your office computer turns it into a virtual conference center. These devices make it possible for you to conduct remote business meetings and place phone calls if you have the appropriate software installed.
These pages are intended to support the Packet Radio users and the AX. I’ve spent many long hours and I continue to research the latest Amateur transceiver input and output connections to insure that most, if not all, these interface drawings are correct. Please use caution as you interface your TNC and transceiver. The caveat is; “I am not responsible for mistakes or omissions.
Happy Packeting, es 73 de Glynn E. Read the following as it will prove helpful later. The mic and TNC connections pictured on these pages illustrate the connections you will encounter with most radio to TNC interfaces. Most manufacturers will apply the same pin connection scheme to their radios when using the same type mic number of pins connector. Receive audio is usually taken from the External speaker in most transceivers, a 3.
One very important reminder; For best TNC DCD performance, your transceiver volume should be set between the 9 and 11 o’clock position. I’ve found that too little audio below the 9: Likewise, too much receive audio will create distortion and will cause inconsistent decoding of Packet data. Knowing this, we soon understand that an optimum setting for the volume control is at the ten o’clock position. The Squelch may be set in a similar manner, usually aroung 10 or 11 o’clock position
Microphone issues only with Siri
Remove microphone from stand – set aside in safe place. Remove bottom plate by removing three screws in base. Save the bottom plate and screws. See diagram for terminal numbers.
Adding a wireless microphone to a computer gives the operator mobility when using presentation software. A wireless microphone makes recording speeches, recording instruments, turning a computer into a wireless recording studio or using voice-recognition programs a convenient task.
The built-in 6-channel mixer with EQ makes it easy get great sound instantly—simply connect your microphones and instruments, or stream Bluetooth audio from your mobile device. Similar to the technology that goes into JBL’s massive concert speaker arrays, JBL Directivity Control Geometry optimizes the spacing and angle of each driver to ensure extraordinary sound quality and consistent directionality. This also eliminates the need for wedge monitoring systems.
Bass-reflex technology further increases the impact of your bass tones, delivering crystal clear, well-defined low-frequency response. Play pre-recorded backing tracks for singer-songwriter gigs. Stream your favorite playlist to set the mood for any party.
Chances are that your mic needs a lot of phantom power. Professional mics need that extra power and most computers, including Mac, are not configured to work with this sort of mics. Most good quality sound cards do not provide phantom power either. Therefore, what you need is a little external mixer or audio interface. Preferably a firewire mixer if you have firewire on your computer, otherwise USB will do a reasonable job as well.
Identifying the sound ports on your computer First of all you need to know the sound input capabilities of your computer. The rear of a typical PC The color-coded jacks on the sound card The pink port is normally the microphone input, and is usually mono but might be stereo. The light blue port is normally the line input port and is usually stereo.
The green port is normally the headphone output port, also usually stereo. Check your computer manual to be sure. PC laptops vary widely in the types of sound input and output ports they provide, where they are on the laptop, and how they are labeled. Many modern laptops do not have a line input at all. Again, check your computer manual to be sure of the capabilities of your laptop, where the ports are and how they are labeled.