Oct 24, 1. Jan 26, UK. Hello I've got an MEC pre amp and i really like its general tone characteristics. My first question is what would be the audible results of such upgrade? I also understand that the battery life will be reduced to about half the way it is now. Will it be possible to somehow add another battery so it help share the load and thus extend the time i have to change batteries? Im clueless when it comes to electronics but im quite an expert sound designer, so please try to use sound terminology rather than electronics.
Oct 24, 2. If possible, I'd install sockets for the ICs and try a few different ones. TL07x and TL08x for example. These are JFET input op-amps, aren't they? You could probably try other low-noise JFET op-amp packages too. For low noise applications I often like the NE dual op-amp.
Upgrading my Bass preamp (TLO62 -> TL072 / TL064 -> TL074)
But there are prpbably many more that would suit your need. But, there might not be that much difference in sound just from swapping op-amps. Many other details in the circuit design matter at least as much I'm no expert on this, not at all. But it's fun to experiment. Oct 24, 3. May 12, The TLE is quite a bit less noisy. It works well in my modified Thunderfunk amp. Oct 24, 4.Welcome, Guest. Please login or register.
Did you miss your activation email? Home Help Login Register. Kesh Poster2 Posts: Total likes: 6. I'm moving from pedal builds to slightly more hi-fi gear, mic preamps and other home studio kit and I'm looking for a replacement for the TL07x family op amps. I really just want the good, but workhorse, jfet op amp that's a replacement to the TL A lot of op amp talk is full of audiophile nonsense that I am sceptical about.
DIYSB seems less full of that guff. The noise and distortion figures from them are ridiculously small. If at first you don't succeed Quote from: merlinb on September 12,AM. The TLE doesn't look great. I just want a quality jelly bean like the but jfet. Of course the worse voltage noise is not an issue for high impedance inputs like a trafo on a mic pre, as current noise dominates. Quote from: Kesh on September 12,PM. Maybe I do like the sound of it's distortion, I kinda approach everything as an "Everything can be made to clip, it's about clipping gracefully" attitude.
I have some mic pres with OPA chips in them, I think they're pretty good sounding. Of course a lot of audiophools dislike thebut it's an honestly good op amp. It always makes me giggle when I think of the hundred or so 's a recording passed through before making it to any format and then someone says they sound like crap in this last piece of equipment on which they are listening.
New and exciting innovations in current technology! Bone is in the fingers. Quote from: wavley on September 12,PM. Quote from: merlinb on September 12,PM. ADA would be more for cases where you are seeking the highest fidelity. It is far better to grasp the universe as it really is than to persist in delusion, however satisfying and reassuring.
While it is just-possible to get mike-level hiss with big FETs, the demand doesn't justify making chips that way. In any other industry, we'd look to change the transducer impedance; alas we have a closet full of rr microphones we must use.
Or a transformer which has other advantages; also disadvantages. With iron, even the horrid noise-voltage of a 12AX7 can be made to vanish below mike self-noise.One of its main functions is to provide a wide range of options for any operational amplifier developed before. It has the characteristics of wide common mode and differential voltage range, low input bias and bias current, output short circuit protection and JFET input stage with high input impedance.
Following is the introduction of TL pin and TL circuit diagram to meet your needs.
TL has eight pins, each pin is used separately, so that the whole chip can realize its function. Circuit schematic diagram can help us better understand the circuits and components used, and is a reference for practical circuit work. Below is a complete TL schematic circuit diagram for reference. Referring to the characteristics of TL, the first scenario we can think of is that it provides a wider choice as an operational amplifier. In addition, we need to understand some other features and applications that can help us make better use of it, such as its low-cost, high-speed, dual JFET input operational amplifier, with an internally adjusted input bias voltage, which requires a low supply current while maintaining a large gain bandwidth product.
Conversion rate is fast. OP-AMP is one of its main functions. It has low temperature coefficient of offset voltage, low input bias and offset current and high voltage swing rate. Below you will mainly introduce TL pin arrangement and TL circuit diagram to meet your needs. TL has eight pins, each of which is used independently to enable the whole chip to achieve its functions. The pin arrangement of TL is shown in the following figure:.
Below is a complete TL circuit schematic for reference. Referring to the application of TL, the first scenario we can think of is that it works as an operational amplifier.
In addition, there are other applications we may need to know, which can help us make better use of it, such as audio mixer, AC inverter, VF driver, oscilloscope.
Okay, okay, I know technically they can be exchanged. Maybe there are other noise or distortion parts that hide the marginal difference between the two parts. The main idea is to use it in front of the preamplifier circuit. How about the overall sound quality of 72 pairs of 82? Strangely, there is not much information. On top of that, TL is now an out-of-date part. If you have rich experience and know what you want. If you use OPAMP incorrectly, you may hear it for example, many people complain about op because they dropped it into the tlnx circuit and hope it works properly.
I think the best thing you can do is look at the opamp specifications and compare them with the requirements of the circuits you use and your budget. Why do you say TL is out of date?
The parameters of and in the data table look very similar has a lower input bias currentand the relationship between equivalent input noise and frequency, thd and frequency of the two devices looks almost the same.
OPA is a nice hifi drop-in replacement to the The TL07X series is certainly not out of date.Swapping opamps in a WM12, worth it? Jun 5, 1. May 30, The Hague, The Netherlands. I've been doing some reading on opamps. I've found that there are better opamps than the six TL's that are in my first generation WM The OPA is mentioned as a drop-in replacement and a better sounding one too.
The OPA advertised as: Very low distortion, low noise and wide bandwidth provide superior performance in high quality audio and other applications requiring excellent dynamic performance.
Anyone ever done such a modification? Any improvements to be gained? Worth the money and trouble? Jun 5, 2. Before you do this, please Google "OPA instability" and make sure you understand why this is not a straight drop-in replacement part. Works OK in many circuits, but could be catastrophic in others. Be sure to check circuit integrity with an oscilloscope if you do the swap. Also be aware of the increased current draw, which might be a deal breaker in some cases. After you sort that out, will it sound better?
Maybe, maybe not. Jun 5, 3. Jan 2, Victoria, Canada. Jun 5, 4. TL, IMO is not a bad opamp, and given the application, can perform quite well. If OPA, is truly a drop-in replacement, then yes these do have better signal-noise specs than TL and more importantly, faster slew rate that's where most harmonic distortion comes from, slow response time.
Jun 5, 5. Jun 14, Tallinn, Estonia Operator: prophecysound systems. Jun 5, 6. My recent project has been improving the sound of my Eden WT bass amplifier.
To that end I've replaced most of the electrolytics in the signal path with film capacitors and bypassed those which could not be replaced. I've also removed some of the high frequency roll-off to extend frequency response from 12 kHz to 20 kHz, as well as changed the overall gain structure to reduce noise. Overall, I think it sounds quieter, and far more open and natural. Whether such an endeavor is worthwhile will depend on how particular one is about their tone Jun 5, 7.
Jun 5, 8.Forum Rules. Remember Me? Page 2 of 2 First 1 2 Jump to page: Results 11 to 16 of Sign in to disable this ad. Actually for driving outputs they perform really good.! Soundtracs used TL's almost entirely in my MX desk I think they used them well, but they did use 's for the channel output stage I just really have a thing for the 's. Personal preference based on a number of different units I have heard and liked only to find there are 's dwelling inside so Thanks for the input, folks.
Now to find myself having nothing to do I actually tried swapping out the s in my mixbuss of the DDA. To my ears, the s sounded " dull". I preferred the s. I then switched the s out for the LMEs.
Game over.! OPA is one of those that's fast enough to have to worry about oscillation, although it's not a video opamp or anything really crazy. It's also a touch noisier than and it uses a bit more current, so you'd have to be careful about swapping a couple dozen in a mixer. I think I'll throw in my 2 cents worth here, If you look at the the data sheets for these 2 devices,you'll notice, that while TL requires only 1.
The original circuit would have taken " gain " requirement also into consideration in their design.Apr 21, Jan 2, Victoria, Canada. Even the schematics are basically the same, so I wouldn't expect much difference in the sound. As mentioned in my mod thread, I've gone through a lot of op amps over the years AlexanderB likes this. Aug 10, Waterford, MI. Well def. So if that mod really takes that curve out of the preamp and makes it sound like the signal from the effects return I will be extremely happy!
Nov 14, St Louis. When trying different parts, be aware that some parts have bad-for-audio characteristics FET input opamps and some others have had, and some still do have, nasty quirks like "output reversal", where under certain conditions of input, the output voltage will suddenly "snap to" the completely opposite polarity This is usually visible in teh specs, but only if you know what to look for Oct 18, Norway.
Jun 12, Ypsilanti, MI Apr 22, Jul 11, NYC vicinity. My vote would be to put the TLEs in. If you decide not to make a major change, it's probably best to just put the TL back in rather than a TL There's actually a TLE in the compressor I built, shown above in my avatar photo. Apr 13, UK. So I stopped bothering. I preferred to use NE chips over the TL and the actual difference was a lower noise floor; the tonal characteristics didn't change much if they did at all, and I eventually got the noise spec down to a level comparable to my Alembic and Demeter preamps, but the basic tone signature of the SWR, whilst useable certainly, was still annoying to my ear and I sold it on eventually as it was hardly used in my commercial studio.
I did a lot of mods for SWR owners I came across, and it was simple demonstration of hearing the difference in the idling noise of the amp vs the lower noise floor of the modded preamp with the NE chips. Tonally, no one complained that anything changed. Apr 26, The TLE's have arrived and have been installed! I started by only replacing the two op amps directly behind the inputs and just from doing that the noise dropped exponentially! With the TLO82's the amp hissed incessantly, even with treble rolled off.
I'm so happy I did this!TL Upgrade. The application is an audio mixer. Not much decoupling to speak of, some many need to be added. What I am looking to get out of it: lower THD, lower noise floor. I replaced all with 's on one board, but there is a lot more noise, even with extensive decoupling. But it's very possible I messed up. I never really liked the TL but the LF was great it's possible that the opa is oscillating given the NF is not direct.
You may have to add a 47pf cap between the output of each op amp and the - minus pin. Last edited by stocktrader; 9th June at AM. Not sure why it would need to be a JFET type here - the impedances are low. I'd suggest a bipolar - like NE It has way more drive capability than TL which is about the wimpiest audio opamp I've come across for load tolerance.
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Swapping opamps in a WM12, worth it?
But it does draw about twice the current if I recall correctly, and so filling a mixer with them might overtax its power supply. At least it is a consideration. What is the mixer - make and model? Good point - the takes more than twice the current of the TL In proposing it here I was only looking at the part of the schematic shown - the mic amp section.
There will be different trade-offs in the various different sections and some may well call for JFETs rather than bipolars.OP Amp Comparison in TS/SD Type Overdrive JRC4458 D, NE5532, TL072
If current consumption is a major issue, TI make some low noise bipolars with quiescent currents only slightly higher than the TL They are significantly more expensive than the though. Originally Posted by stocktrader Last edited by ivandezande; 9th June at PM. Originally Posted by Enzo. Originally Posted by AndrewT.
Could it be the capacitors adding noise? They are all over 20 years old by now. BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is PM. Resources saved on this page: MySQL User Name.