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42 Threads found on Mic And Amplifier
Q1 and Q2 form a two-stage audio amplifier circuit, the audio signal received by the mic by the C1 coupled to the base of Q1, amplified by the collector directly to the base of Q2, Q2 in the collector to get a negative square wave, with To trigger a bistable circuit. R1 C1, the circuit frequency response for high sensitivity limit in the (...)
Hi. I'm making a sound level alarm, a simple device that will turn on a light if the sound level is above a certain level. For this I would like it to have the ability to be really sensitive, but I'm not sure how to achieve that. Right now I'm using one of those cheap through hole electret mics with an LMV358 op-amp, but there's a limit to how much
HI, In my VOIP application. i have used audio amplifier and mic (condenser type) for open environment. But the mic has pickup speaker signal and it create ECHO issue. i want to arrest echo problem in hardware level. So please suggest Echo cancellation or suppressor ready made module / chip
I need HELP to make a low noise amplifier circuit to amplify mic signal. i want to amplify mic signal and give them to speaker . mic --> LOW NOISE amplifier -->> SPEAKERS. i have tried lm386 but it gives too much noise .
okay another question which is slight away form this topic,sorry if the question is very basic output of microphone (transducer) is voltage signal(voltage varying with time) if the power amplifier want to amplify the current of this signal ,how could it be, because output of transducer is voltage signal not current signal. help me understand (...)
Electret mic needs a pullup R to determine gain and DC quiescent point. (+) input needs to use same DC voltage rather than Gnd, but a bigger LPF <50Hz to remove audio, then Vout is near 0Vdc.
I am using lm386 for signal amplification recievied from microphone and then send them to analog pin of i need a speech filter circuit also between lm386 and arduino or lm386 would limit the frequency response to 300-3400hz (the speech audio spectrum range)??.... { basically i am trying to make a audio recorder..the arduino will store
How to design a preamplifier and an amplifier circuit for a very sensitive microphone signal having output is approximately 12mv .
You probably have an electret microphone which is a condenser mic that has the 48V permanently stored in the electret material and it has a Jfet impedance reducer inside that needs about 0.5mA through a resistor at a low voltage. There are hundreds of preamp circuits for an electret mic in Google.
Electrets produce quite a large output voltage compared to most types. If the Elephant is within a few hundred metres you may see voltages as high as 100mV from them so you don't need a lot of gain. I assume the battery is inside the microphone so you have a shield (ground) and 'live' wire from it. The amplifier probably isn't critical (...)
is no sound from the speaker when in RX mode. The RX circuit seems to be working fine as you can see it picks up the signal and shows RX on the screen. The mic(sound input) is not working as well as I tested it by pr
i need a circuit that takes my voice (via microphone) and hear it by speaker for now.... and later i want to convert my voice to digital.. for the first step i connected a circuit as in the TDA7052 datasheet but i didn't hear anything and on the oscilloscope i just saw a small noise signal. i added an op-amp (...)
Hello all, Am in the process of designing a voice trained robot circuit.. For that I've built an amplifier...and it is working well.. (link to amplifier circuit that i built: ... /Lab1b.pdf) But, now I want to interface mic to this circuit.. I thought of using i378MV iBall mic for my applicatio
Your schematic shows how to get a mic-level signal from your electret mic. However it is not a pre-amp. The signal needs more amplitude, for it to be strong enough to drive the input of your amplifier. Right now you have a weak signal. You have to speak loudly before you can hear any sound from the speakers. Since you've been able to get (...)
What you amplify? Remove R1 and R2, check polarity orientation on C3 and C2. Try this
Good evening. I'm trying to design a single stage BJT amplifier whose input is an electret microphone and its output is a 16 headphones. Here's the circuit so far: 79260 It was calculated for a IcQ=7.9057 . It also has a Zin = 2.058 , Zout = 470 , AC voltage gain = -0.0678 ans Current g
I like the Electronic resource book sky_123 for ease of reference. I'm not sure what radagast had in mind for biasing the mic DC voltage and what voltage the motors are rated for. 6V may work if that is what he has intended. with 4 AA cells. THere are two possibilities. VOX toggle switch with constant Voltage (CV) or Voice controlled torque.
The spec of the electret mic element should show you what kind of signal you will get out of it. You'll need an amplifier (a single transistor amplifier will be sufficient, no need to use an IC). BTW, you don't really need a microcontroller to light an LED when there is sound. I just googled for "sound detector circuit" (...)
I don't know if what I am trying to do is even possible (with my device). I want to connect a microphone to one of the input ports and then sample it using the ADC just to see if i get a voltage change, but I don't really understand how to wire the microphone (GND & POS). I am using the MSP430. I am new in embedded system
If I understand your intention right, I don't expect, that mixing/adding the microphone signals from multiple rooms and locations serves the purpose. It will reduce overall signal-to-noise ratio by a considerable factor and possibly causing failure of a system, that works well with a single microphone. (...)