4556 op amp distortion test

The 4556 op amp features higher output current than the typical op amps. It can be very useful if distortion is not excessive.
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[@micomrkaic]

John, this op amp can be put in parallel, as was the case in the famous O2 headphone amplifier. If you parallel a some 10-20 4556 chips (20-40 op amps), you could get decent output into 8 ohm speakers (maybe even 4 ohm). That would be a cool project and you would not have to do anything else -- just parallel the chips, use small current sharing resistors at their outputs and that's it. If I'm not mistaken some famous designer did that with NE5532, but with 4556 you would use even fewer chips.

[@JohnAudioTech]

I remember seeing that project over on the DIY Audio forum once. Quite part intensive.

[@johnyang799]

Douglas Self did one. The performance is quite good. However it's massive in quiescent current. And in fact blameless amp circuit can have much lower distortion of less than 0.00005% with some tweaking in feedback/compensation circuit with just simple Darlington output stage.

[@Gruftgrabbler]

You teaches me so much about amplifiers and op amps. thank you!! :) I wish you great success and a lot of fun

[@JohnAudioTech]

Thanks for the kind comment!

[@MassimoTava]

Always excited for new videos!

[@edenronald8991]

i guess Im asking randomly but does anybody know a tool to log back into an instagram account? I was stupid forgot my password. I love any assistance you can give me!

[@vancejeremy7939]

@Eden Ronald Instablaster ;)

[@edenronald8991]

@Vance Jeremy Thanks so much for your reply. I got to the site through google and im trying it out atm. Seems to take quite some time so I will reply here later when my account password hopefully is recovered.

[@edenronald8991]

@Vance Jeremy It worked and I finally got access to my account again. I am so happy:D Thank you so much you really help me out :D

[@vancejeremy7939]

@Eden Ronald No problem =)

[@SpeakerFreak95]

John, have you tried out the SSM2142 line driver? Now that’s a high current low distortion device! I have several Wheatstone broadcast products that use these, and I love them. My favorite audio output IC for driving balanced audio lines.

[@gkdresden]

I like the 4556 because of its output current capability (70 mA). So you can use it directly for headphone amplifiers, even in class A mode (with an NJFET between output and negative supply voltage, I use the J113 with gate and source shorted, which gives a current of 20 mA through the output stage).

[@Axldeziak]

It was used in alot of overdrive guitar pedals such as the Tube Screamer, and the OD-1.

[@JohnAudioTech]

I wonder why they needed the high current output for a guitar pedal?

[@worstuserever]

Aaw poor Snickers! Caught handling cat food, have to give him something; them's the rules. Mine will kill on command for a meaty treat stick.

[@EngineeringEssentials]

Good video John 👍. I have a question for you, is there any change in THD, when loading both output vs Single output? Also with different gain settings?

[@JohnAudioTech]

Do you mean combining the outputs with load sharing resistors for higher current? Since each side would be handling half the current, the distortion should drop. Lower gain should reduce distortion at least at 1KHz. I'd have to see the spectrum at high frequencies.

[@EngineeringEssentials]

@@JohnAudioTech thank you 🙏,

[@davidgriffin79]

How about testing the TPA6120; that's a very interesting chip.

[@laxr5rs]

Thanks!

[@youwilldisobey]

Oh Mang, give that Snickers a Steak, Dang that Distortion Mang

[@amitghosh6966]

I came across an amplifier made around LME49710 opamp and two transistors 2sb772 and 2sd882 operating at 12 volt 4 ohms claiming to deliver 3 Watts power. I want to know how much maximum watts can we expect from 12 volts supply ?

[@iblesbosuok]

NJM4556 and M5216, which is the better?

[@777musiqofficial6]

Sir can you please make a video on how to make inverted and non-inverted from one signal. Want to make a bridge mono amp.

[@jp040759]

That is a very common chip in misc. stereo gear. Must have decent audio specs.

[@pliedtka]

Yeah, my '90s Sony CD player uses it as HP amp, and variable line out. And something interesting its application has a little more bass, than straight from 5532. How about two of them in parallel - should drive something Sennheiser HD650 no problem

[@SianaGearz]

Two 4556 in parallel is basically the legendary NwAvGuy's O2. I don't think 5532 by itself is a suitable headphone driver. A nice headphone amp with 5532 and a couple transistors per side was shown on this channel, it's essentially a classic generic circuit, the vid was "Headphone amplifier breadboarded and tested - DIY"; ESP's project 113 is a slightly fine-tuned version of the same, though can't say i'm convinced that the extra components sprinkled by ESP would make for an audible difference.

[@DAVIDGREGORYKERR]

Can you not go with 16384 Bins to speed up the acquisition rate.

[@SianaGearz]

I can't think of many headphones it can't drive, alone, by itself, it should span just about the whole gamut of more or less adequate-sensitivity headphones, from low impedance ones and earbuds, which need a substantial current but not much in terms of voltage, and to studio high-impedance ones which need more voltage swing to be viable, but don't need all that much current at all. And they don't need to be particularly sensitive either, it'll do fine. Try it with 32- and 16-Ohm loads, at about maybe 1-2V? What do you think is adequate? I know it's not rated for that but it goes and does it anyway. Unfortunately there's not necessarily any known second-source for these, it's a NJR exclusive part, so it's looking a bit sad if they do decide to terminate it. Other generic opamps you also get from Diodes or from ROHM etc but not these. Looking now there appears to be a Chinese chip SIMC D4556 which reads like a match, hadn't seen that one before, but i don't know, part of 4556's usefulness is how well and easily it exceeds the spec.

[@JohnAudioTech]

The JRC datasheet shows a couple surface mount variants of the 4556, so at least it has made the transition. No guarantee that it stays in production, but the low cost and reasonable performance should keep it going like the 40-some year old NE5532.

[@pliedtka]

It drives HD 600 series, with impedance of 150 and 300 ohm no problem, unless you want get deaf or blow the drivers. No problem with Beyers either, 250 and 600 ohm. But audiophiles say the better AKG hps like more current than regular chip can provide. Today many headphone amps (Topping, other Chi-Fi) are build around TPA6120 and some op-amp, with DC servo for best performance.

[@SianaGearz]

@@pliedtka You mean AKG K701 and its derivatives? At 93db/mW, which is a fairly low sensitivity, that comes out to 0.25V at 1mW, and from there on, you need to make up 22dB to get to 115db, which is often mentioned as peak SPL that one may desire to reach in transients, though not safe for prolonged listening, so a gain factor of about 12, so that's only 3V and 50mA. I honestly don't see the problem for the chip, it's not even being pushed hard. Furthermore at 115db, the K701 are already reaching 150mW and they're only rated to 200mW, so you really shouldn't be chasing any more power through them! Also DC servos are yucky, and why? They never actually made anything better.

[@Spentelectrons]

Try the OPA551. It can handle 200mA continuous

[@JohnAudioTech]

It's an nice op amp but its $5 a pop.

[@Spentelectrons]

@@JohnAudioTech have you experimented with the LME49720? I recently threw in a handful with my last mouser order. Seems to perform well with gains of 5x or less. Also expensive though

[@JohnAudioTech]

@@Spentelectrons As I understand it, the LME49720 and LM4562 are the same chip. There's a story that National Semiconductor started the LME line for high performance components, but the LM4562 was a well known high performance part, so to keep the brand identity, they retained old number with the new one.

[@dmcbohol]

just at the very end of the video you said "... I can't read" and Snickers said "Why?"

[@dedskin1]

i made a NE5532 headphone amp , tested it to see can it run 36ohm HP , and... not only that it can run it , i cant handle more then half volume at 10V dual rail power . Its just too loud , and clean power . So if you have 36ohm headphones it can handle it , more then happy . If im correct 90ohm loads will be even easier , so you dont need 4556

[@SHADOW47196]

Can you test a TDA7266S audio ic I really want to get more information about that ic Peak power Distortion test in 8ohms and 4ohm load (More) That ic have 5watts + 5watts power (Stereo)

[@dipakbhalodia7155]

How to test and circuit diagram please send

[@chefbink61]

My Kitty wont eat that food ether... I'll put it in her bowl and she'll look at me like I'm crazy!

[@tenmillionvolts]

I do the sniff test. If you sniff the open bag and it smells like a wheat field, cat doesn't want it. They all advertise how many vegetables are in their products too. Like cats are raiding celery from local gardens. I don't think so!

[@chefbink61]

@Lassi Kinnunen 81 hehehe My kitty wont eat any kind of fish,,, I sometimes wonder if she is even a cat

[@chefbink61]

@Lassi Kinnunen 81 She likes beef and chic and I buy the raw meat rolls at the cat shows for my kittys. They eat better then I do!! I do feed them some dry but not a lot.

[@JohnAudioTech]

@@tenmillionvolts The vegetables are fillers to keep costs down. I can't afford $200 a month on cat food, so I go middle of the road, looking at the first few ingredients listed on the can. You can't get totally away from the fillers, but at least there's some real meat in his canned food (not byproducts). The consensus is to be feeding cats a wet diet, so Snickers is eating 100% canned food.

[@jimcatanzaro7808]

How’s snickers

[@jeffm2787]

Hmm, might be good enough to drive some pre-drivers.

[@JohnAudioTech]

Those TO-220 FJP5200/1943 transistors have decent gain at 5A, so the 4556 could direct drive them in an amplifier with +/- 15 volt supplies. Something I want to try.

[@johnsonlam]

Snickers just want a lunch (or dinner?)