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The text on the original schematic says, "Class-B Amplifier" which is wrong. It is class-AB. I agree that the simulated amplifier will work much better when it has a power supply (+ 37V and - 37V) and has the negative feedback (NFB) connected. The audio input says, "VAMPL = 37V" which must be another error.
Your latest class-A amplifier circuit in post #5 has a fairly high output impedance. A speaker will short its output. ALL audio power amplifiers have negative feedback but yours has none. The negative feedback "tells" the amplifier: 1) Reduce the distortion. 2) Flatten the frequency response 3) Holy Smokes! Something (a shorted output) is (...)
LM386 is not operational amplifier it is low voltage audio power amplifier.
zsolt have a look at the Elliot Sound website: There are various proven circuit designs which can be configured as you need as an audio Mixer in the 'Projects' section. Various others if you do a search on't 'net For a 'Matrix' configuration, say 3 inputs to 3 outputs, look at creating a form of cross
Hello everyone......... I am working on Sigma Delta Modulator For audio Range of 0 to 20KHz..... I designed the two stage class A/AB amplifier, internal positive feedback hysteresis comparator and 1 bit DAC.... My supply voltages are 0 to 1.8V in 180nm of technology in CADENCE.... But for both amplifier and comparator my PSD vs
I made another preamp,what you say?it is ok?How do I calculate the output capacitor? Much better! There's one problem that may not be obvious: The TL071 has a gain-bandwidth of about 3 MHz, so with a voltage gain of 1000 the frequency response of your amplifier will roll off above about 3KHz. This is not good - for
hello forum. ı want to build a audio amplifier circuit. And ı built this circuit. But output power is reasonable at 20 hz or 2 khz or 10 khz. ( minimum value of output power is 5w) but other high frequencies such as 15khz ,20 khz , the output power is not reasonable. what can ı do for high frequencies. here is circuit : [ATTA
The old TBA810 is obsolete and is not made anymore. Its performance was not good. Its datasheet says DO NOT USE IT! You must learn about audio amplifiers to understand bootstrap, compensation, ripple rejection and feedback. The datasheet says that without feedback then its gain at low frequencies is 10,000 times which is way too high for (...)
is there any person who works on emic2. actully i wanted to opertae a relay via pic16f887 and wants a audio feedback, i cant use apr9600 bcoz it has limited storage for audio output, so plz anyone there guide me for this situation..i,m also using computer to give commands to microcontroller, so if there is any software that give me (...)
Your next problem will sampling the ADC fast enough but lets cross that bridge when we reach it. But which bridge the OP is actually heading for? I need to sample audio signal through microcontroller and will keep it to a variable which I can display through LCD interface and send this value to my computer through serial com
I think you might have an impedance matching problem. Doubtful. The output stages of audio amplifiers are voltage sources. So long as the power supply can supply enough current, and the output stage can withstand it, the load impedance is not critical.
LM317 PSRR will result in mV hum with unregulated supply which is already perceptable. Your observations also suggest an unsuitable grounding scheme where the filter capacitor's AC current is sharing a wire with the audio signal.
The problem isn't the supply voltage exactly, it's the maximum swing you can get at the output of the amplifier and you have to consider that as the output gets close to the positive or negative maxima (approaching clipping point) the distortion will increase significantly. Any DC at the input, whether from an external source or the internal offset
This little amplifier gives me an idea of making a small positive feedback amplifier using a single transistor. I have not seen any such audio amplifier on the web, aren't they used for autio? have you got any schematic sources? I have only found this
Depends on what you want to drive: If it is a simple DC current (e.g. for driving a LED), a current mirror (1 : x) should do it. If you need an audio driver, you have to use an opAmp (with feedback, linearity reason). 30mA isn't a challenge, needs rather large transistor(s), however.
Hi all, I have created 12Vdc using boost converter, and it will change its polarity as I direct H-bridge. I have to have one visual and one audio feedback of correct volatage and polarity respectively. I want to know what kinds of method i should use and what types of electronic parts i should use? Hayden
Hi everyone, I have what I hope is a really easy question. I am creating a blendable feedback loop circuit, which has 4 jack sockets (guitar in, send, return and out), and a pot between the return and send jacks so I can send the signal back to the send, creating a loop. This all works well. I also have a blend circuit, so that the dry input sig
HI all!! I need to design a ANALOG filter for processing input audio. I intend to make a low pass filter with cutoff around 10kHz. The input to filter is from a line-in or microphone after passing through amplifier. Can anyone with experience in audio tell me how to proceed as to choice of quality factor, response, order of filter. The idea i
are you talking about a class D RF amp? Rather a class D audio amp, I think. I'm not an expert for state-of-the-art of class D audio. I've seen reference circuits for class D, that connected the feedback path before the output filter, e.g. with National LM4651. In this case, you shouldn't have inductors with considerable non-lin
hi all if i have the following scheme: 63119 suppose the codec is G711. the first iteration is sampled voice is enter to the codec (no feedback) the second third and so on, is the feedback will degradationin voice quality occur after the first iteration? what will happen in G729? in my opinion, in G711 case,


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