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# Amplify Small Signal

31 Threads found on edaboard.com: Amplify Small Signal

## How to amplify small swings in voltage?

I've built a first, small AM radio and I'm just getting into electronics. I'd like to add a station strength indicator LED. The voltage exiting the amplifier stage varies by a small amount, 100 or 200 mV, based on signal. How can I amplify that swing such that the LED will vary output in a meaningful way? Just hooking it up (...)

## How to amplify 2mV signal to 100mV?

The 2mV input signal is two small compare to the offset or noise voltage. So which amplifier can be used to amplify so small signal? The input signal can be DC or AC. Could anyone help me? thanks

## Crystal radio amplifier of very high gain needed

Hi, I have a crystal radio (single diode detector) and I need to amplify the detected audio signal so that it can drive a small speaker or headphones. The amplifier must have as much gain as possible. The whole circuit must be made discrete (no opamps) and using as low parts as possible. Power consumption is not important, simplicity is (...)

## Narrow pulse amplify

Hi guys. I want to amplify a microwave pulsed signal, with small pulse width (10~20ns) what should i do? are an cw microwave amplifier can amplify the narrow pulse signal?

## IF signal amplify without delay

I have a RF Frontend that has an 4 IF signal output (2 I channel and 2 Q channel from 2 receiving anettans). Each channel of the IF has a signal rangining from 1.5V to 3.5V with a DC offset of 2.5V. IF output signal: 111250 I want to sample the signal with an ADC that has a reference voltage from 0 to 5V and use th

## Measuring small current signal on top of DC offset

With a secondary current load resistor of (max.) 30Ω you receive about 0.3mV of fluctuations ac voltage. Separate it from the (max.) 6V DC voltage via a capacitor and amplify it.

## small signal power amplifier

I want to design a circuit that will amplify a very low power signal of -1762dBW to 2W DC. But I don't know how to get started, though I have some basics in circuits. Can anyone help me with how to get started, some tips. Or tell me is it possible???? I need your help..

## Would You Expect this Op-Amp to Amplify Small Voltages?

The very old Japanese dual opamp has a typical voltage gain of 110dB (300,000 times) from DC to about 10Hz. If it is biased properly it can amplify 15uV to 4.5V but it will have a lot of noise. Is a rolloff at 10Hz good enough? What is the signal?

## LNA transient analysis

LNA is usually used to amplify the very small signal (uV~mV), so you have to ensure the swing in the the transient simulation

## Help in designing RF amplifier with specifications

Is it a power amplifier (what about the output power), a small signal amplifier or a low noise amplifier (in this case what about the noise figure) ? The specs should also include: the type of the signal you have to amplify: CW or modulated (in this last case which kind of modulation) ? intermodulation performances (...)

## Noise source for filter measurements

not many noise sources have enough output power. I agree. Even if you amplify the signal, the "signal" power in the given measurement bandwidth (spectrum analyzer BW) is only a very small fraction of the total noise power. Let's assume you have a noise source followed by a nice power amplifier, with total

## analog multiplexer designing and ic detail

I'm not sure you can find a multiplexer that will work that well at such low levels (but I could be wrong, again). You need to consider noise and distortion, and I don't think they spec noise for muxes. I would amplify the signal first, and then apply it to a mux.

## audio amplifier for am transmitter

There is no fixed formula for calculating the gain needed to modulate an RF signal. You have to amplify the small electrical voltage or current from the microphone to a strength that's sufficient to modulate the RF signal. So, the amount of gain necessary depends on the output from the mic and the RF power at the point of (...)

## Which select transistors? I need high dB gain

Hi, I want amplify the signal on buffer(VCO) -5 dbm I want find a transistor NPN with high dB gain. I'd like to find a NPN to gain > 20dB Have you a name of transistor for small signal to recommend? PS: Frequency operation is less 250Mhz

## Why do we amplify signals at the receiver side?

You amplify signals, because your A-to-D converter doesn't have enough resolution to "see" a typical, small incoming signal, say around -90 dBm (which is about 20 microvolts, pk to pk). Most receivers have a conversion gain on the order of 50-100 dB, so that brings your signal up to a range of -40 to +10 (...)

## external Voltage REFerence (low limit?) C8051F330

Why do you not amplify your very small signal to a range of 0 - 5 V?

## (pir)passive infrared sensor getting signals

You need to supply power to the sensor and amplify the signal if it is very small. The resultant signal can be interfaced to a A2D labview card or even cheaper use your audio microphone or line inputs

## Compare single/dual power supply OPAMP?

Which is better? for my idea, I preffer use Single OPAMP because it's easy to design power supply. But if we want to amplify small signal ~ 0 to 10mV we need shift it to DC voltage to fit with bias condition. Do you have any idea?

## What is the purpose of op-amp?

we use amplifier simply because we need to amplify small signal to drive certain circuit for a certain application.

## What topology suits my requirement?(fixed-gain openloop amp)

I need a open loop circuit to amplify small signal(0~12mv) by two or three,and gain error <5%,Does this kind of circuit exist? thanks in advance.

## why input signal amplitude is not specified in class d amp?

Most of the time, audio signals are very small, with less than 1V as the input and always several hundred mV or several tens mV, so there is no need to specify input range, also, there is always a PGA to amplify the incoming signals. For SNR testing, one may input a 1mV (-60dB) signal to test the (...)

## Which IC or transistor should I use to amplify 1/2MHz signal

hey.................. please could any one tell me which IC OR TRANSISTOR should i use to amplifie a 1 mhz or 2 mhz signal.......with schematic please

## 400W Powered Amp for small signal input

Hello , I'd like to build a 400W powered amplifier for small signal input from a microphone source to amplify vocals out of PA speakers. I have found the following schematic and I have two questions for whomever is willing to help: 1) Is this circuit adequate for the application? 2) What type of power source should I be looking for (...)

## Convert output to 0-5V

One option is to use opamps .. see picture below .. The first opamp may "shift" the voltage from 0.3-4.9V to 0.0-4.6V and the second opamp may amplify this signal by 1.087 to produce the required 0-5V output .. Another option is to employ a small microcontroller such as the 8-pin PICAXE-08M, use its PWM output to generate 0-5V and set (...)

## cmos high speed operational amplifier help

I want to design a high speed cmos operational amplifier which can amplify 1Mhz small signal. Could anyone help me? Best regards.

## Measure current using a microcontroller

You will have to use a high side or low side shunt and amplify the small signal with a low offset amplifier and fallow it with a comparator. the output of the comparator can be monitored by the PIC to protect your motor.

## Problem with distorted signal when the gain is set to more than 20 (LM386 audio PA)

I am currently doing a small project that involves creating a small audio amplifier circuit that will amplify speech output on a phone. I have made up a circuit on a breadboard (vero board) using an LM386 audio power amplifier using the first conifguration example from the datasheet. I have connected an 8ohm 0.1W speaker. The problem im (...)

## How to measure high alternating current of AVR ATmega8

You should use opamp (with dual power supply) to amplify signal from currrent transformer (if its small to much). Then you can make bridge rectifier with schotky diodes (low voltage drop). Then you need ADC (inside mcu or outside), so you need to get samples of current and do some math (to get effective value). Lots of work. (...)

## Small package motion device

Use a commercial passive IR detector (as used in burglar alrm systems) or Use an IR photodiode as a detector(plus the necessary amplifier). Place a Fresnell lens in front of the photo diode. The humabn body will be a source of IR signal. Use a high pass filter to detect the target movement (The Fresnell lens will "amplify"target movement.

## chopper A need help urgent

I need help to finish this project. I used 2 IC555 as Astable and Monostable to trigger the MOSFET IRF620 n channel, I can also change the frequency and duty cycle. I got two problems. 1/. The output signal is small when compare with input voltage(~50V), can the LM358 amplify this signal, if not, what else IC I can do, I (...)

## serial port comm with Video device

Hi all I've built a basic circuit to communicate from a Sony Camcorder to my PC, using the serial port and a small circuit (MAX233A chip with one capacitor, to invert/amplify the 5V signal from LANC) to allow the data exchange. since sony uses a standard very close to the RS232 protocol, I was able to read some data and to confirm that (...)