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Pocket Hearing Aids Body Worn audio amplifier, View Pocket Hearing Aids, NewSound Product Details from Xiamen NewSound Technology Co., Ltd. OPA134 is low noise, low distortion operational amplifier from BURR-BROWN semiconductors and it is exclusively meant for audio applications. Good day, I’ve always loved your circuits and explanations, so I would like to ask about an amplifier circuit I assembled today. But the sound is very loud and noisy when I turn down the stereo potentiometer (It works fine only on the highest resistance value) , so is it the 10k potentiometer (should I use 100K?) or is it lack of voltage? If you use a 47K potentiometer use around 47 K in series with the pot before connecting to card output, This should match the line impedance 100K. As your instruction, If I connect both channel (L+R) in Pin6, then it will be look like Bridge circuit (As Shown in the IC DATA SHEET). Hi Digonto You connect C1 of the above circuit to Pin 7 (pin 6 for the other channel) of the IC TDA2822. For the above application DIP8 pin TDA2822M FCI Semiconductor Dual Low-Voltage Power Amplifier in bridged mode is most suitable.
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The CMOY Pocket Headphone Amplifier is used for boosting the volume and audio quality of headphones and also smaller speakers. If you live on your computer and want to hear better sound then you need to break away from the in-built soundcard and move to an external digital-to-analogue converter (DAC). The Teac's aim is to take any audio source you may have and pump it out of your speakers or headphones with the best possible quality. But at ?700 it's not cheap, which is likely to limit its audience to true audio obsessives only. The only output is, of course, analogue and is in the form of speaker outputs, delivered at 90W per channel. We've used a lot of high-end headphones and amps in our time which typically deliver an "untouched" sound quality. We used some high-end Dali speakers and Denon headphones to test the sound quality of the AI-501DA. Clarity is breathtaking, and given some decent audio - we've been testing from a CD, iTunes lossless, as well as other lossless formats and high-resolution audio from other stores - we just couldn't get over how rounded and crisp the sound was. What you can find in studio quality is a load of jazz music, and the odd lady singing some classical tunes.
We used it with a Windows machine, where it's plug and play operation was simple to set up.
But there was one glitch in our use: at times the Teac would just vanish from the sound devices list.
After weeks of listening Teac had to prise this machine out of our hands because we loved it so much and didn't want to give it back - how's that for testament to a product being top quality?
Starting off as a spotty youth who worked in Currys, he moved to the BBC (after getting a degree) where he was an editorial wrangler. Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc.
I'm interested in finding out more information about the resistance coupled radio circuit used by King George V. I think they're saying that it doesn't use inter-valve transformers, but resistance coupled is a mis nomer. The story told by those old adverts is that in the early days people used low mu valves with transformer coupling.
What this shows is that fashion 'engineering' in domestic electronics is not a new phenomenon! Reminiscant of the '50s when a new set was announced as 'transistor' because it used one somewhere for something quite insignificant which could have been done just as well or better by a valve.
I reckon that even the transformers used with low mu valves (so lower inductance primaries required) had a pretty awful frequency response- OK for clear enough speech but distinctly lacking in LF and HF capability for music.

The circuits seem to show an odd regenerative tuned first HF stage followed by a couple with with R-C coupling- no neutralization so presumably not a lot of gain either- followed by a 3-stage RC coupled audio amplifier. The regenerative circuit in the King George set has no grid leak or grid capacitor, so I'm not sure what they were doing with that.
Some sets use a variable capacitor for adjusting amount of positive feedback and some use a Potentiometer. IIRC the single transistor was used as sync separator but I've never actually come across one.
It seems that the phrase 'resistance coupled' ended up being pretty widely used to describe what we would now call capacitor coupled. If you require further details regarding the transaction data, please contact the supplier directly. In addition to the IC OPA134, the circuit uses only few passive components and can easily generate a lot of sound from even the most inefficient headphones and there will be no compromise for the quality. The FET based input stage provides the IC with high input impedance and it makes the circuit very flexible in terms of the audio source. It is a simple design that fits into an Altoids tin and runs many hours on a single 9V battery. It is inevitable that eventually fully assembled CMOY Pocket Headphone Amplifiers became available as well. You can give it digital or analogue sources to amplify, or connect it up to a computer via USB for amazing sound quality.
You can connect pretty much anything to these: from a cassette deck, through to an MP3 player. This is connected to your computer, and will allow the Teac device to act like a soundcard. These are bindings that you can either thread a speaker cable through, to keep it in place, or fit with banana plugs.
There was a time when every piece of audio equipment had a dial, but that was before remote controls came along and ruined the party. In practical terms this clean sound is bad news when the Teac is fed with low-quality audio. The problem you're going to have is that you won't find much material from the "popular music charts" in this format. We used some really nice headphones, some with a slight bias to bass frequencies, and we got a real kick out of what we were hearing. Now that's not Teac's fault by any means, but if you're a pop prince like us then we'd like to hear some Ellie Goulding in said quality - we would happily pay a premium to listen to such recordings.
It's a good demo of top-spec clarity, and might be spot on for your musical tastes, but it's not what we chose to listen to.
We never got to the bottom of this, but it was usually solved by turning off the amp and then turning it back on again. Now, ?700 is not too much money for such a high-quality system, but it is a lot of money for anyone to cough up. We loved the classic design, but it was the unprocessed sound which wasn't to our taste at first. A stint writing for Top Gear and co-presenting Sky One's Gadget Geeks completes the picture. This gives relatively low stage gain, but high mu valves would need a much higher transformer inductance so not practical. Resistance Capacitance coupling would be capable of much better fidelity at the expense of the extra 3:1 or so voltage gain which a transformer could provide.
I'm not sure if because originally variable capacitor was more stable and cheaper (now a pot is much cheaper and quite stable). We will delete it soon, if we are involved in the problems of article content ,copyright or other problems. In addition to the IC OPA134, the circuit uses only few passive components and can easily generate a lot of sound from even the most inefficient headphones and there will be no compromise for the quality.OPA134 is low noise, low distortion operational amplifier from BURR-BROWN semiconductors and it is exclusively meant for audio applications. You can plug almost all types of sound sources like, mp3 players, iPods, mobile phones etc to the circuit. For what is basically a DIY design, the CMOY easily rivals many higher priced and branded amplifiers on the market.

This one uses TI TLE2426 rail splitter virtual ground for stable performance and Burr Brown OPA 2134 op amp for perfect sonic clarity. Not all CMOY kits are created equal, others use cheap low quality parts and circuit boards. There are two optical inputs, and one coaxial input to extract digital sound from a device - like a CD player, or games console - and output brilliant lossless sound quality.
If you don't have audio built-in, then this will give you a high-quality way to listen to things from your computer.
The problem was that if you had a remote and a dial volume control you either needed to motorise the dial, or design one that didn't really adjust anything, but electrically controlled the volume.
The fact is, equalisation can hide a multitude of sins, and a lot of people will ignore the shortcomings of compressed music when there's a nice lump of bass to warm your ears. We hope this changes, because lossless high-quality, high-bitrate audio is mind-blowing - definitely worth searching it out. Rumour has it Sony is going to unveil a HQ audio store soon, so we're keen to see how that pans out as it ought to mean a huge catalogue of audio.
By the time you've added decent speakers and any other devices you're looking at a lot of cash. But the more audio we fed the Teac - and the higher quality the source material was - the more we got it. Some multistage TRFs without regenerative feedback may have had an RF transformer for each tuned stage and maybe a 3 gang or 4 gang capacitor. Then someone decided that high mu valves with resistor loads and capacitor coupling might be better for audio. With higher mu valves to overcome this problem, the result was a better sounding amplifier. Also if the bypass capacitor on the resistor isn't large enough you can get instability at audio frequencies.
It's also the only way to get very high-resolution audio into the Teac to melt your ears with joy. Yank it towards 11 - although the precision device that the AI-501DA is it deals with volume in -dB. The Teac doesn't add that, so unless your speakers and headphones have their own characteristics, then you're going to be disappointed.
In this case though, there is a driver for both Windows and Mac, and a high-resolution audio player for both that allows you to play audio encoded at much higher quality than a CD.
And then it totally sucked us in because the audio quality is, without doubt, absolutely superb.
The other more stable arrangement is grid leak resistor direct to 0V and series isolating capacitor of RF value. I don't have copies of the original articles so I can't be certain that they describe capacitor coupled amps, but I guess they do. You can plug almost all types of sound sources like, mp3 players, iPods, mobile phones etc to the circuit.In the circuit IC OPA134 is wired as a non-inverting amplifier. However you look at it, it's cool to have dials - which is a very long-winded way of declaring our love for the Teac AI-501DA. This was annoying when it happened, but it didn't happen often, and once we worked it out, we understood how to fix it. A fashion bandwagon develops, and people then start to use RC coupling for RF stages where transformers are definitely better. The load resistor R5 will stabilize the virtual ground and prevents any noise or distortion in the output, but the output will be DC coupled.
This is most likely a driver issue and we've queried it with Teac to see if they can find out the source of the issue.
But perhaps back then everyone simply understood what it meant and there may not have been any intent to deceive when using it.
Because nothing gives you a faster or more intuitive way to adjust something than a lovely tactile dial.

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31.12.2014 admin

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