Low Cost OpAmp PreAmplifier Board Schematic & test; Bode Plot with Omicron Lab Bode 100
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- Опубліковано 22 гру 2023
- In this video 'Low Cost OpAmp PreAmplifier Board Schematic and test; Bode Plot with Omicron Lab Bode 100', I will show the Los Cost OpAmp PreAmplifier board. I'll show the schematic and Bode Plot with Omicron Lab. This is a great OpAmp board for testing OpAmps.
#OpAmp #PreAmplifier #OpAmpPreAmp #KPSmultimeter #omicronlab
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I first looked at this board about 3 years ago. Sadly, the parts change from batch to batch. A fault I have found on ALL these boards is C11, in the feedback loop. 330pf is just a joke. Could not be classed as HiFi under any stretch of your imagination. Replacing this with a 25-33pf gives you a ruler flat frequency response of about 45khz and very nice square waves with a fast slew rate. Many batches of this board also have a fake 5532. Funny thing is whatever chip they are using, in this case is still quite good. Only real difference is slew rate and noise. Works better on a higher voltage. Not sure why you choose such a low voltage? This also limits headroom considerably. Swapping chips makes surprisingly little audible difference. You can measure slight differences in noise mostly and slew rate. Sadly, I cannot measure low enough distortion with my test gear. Needless to say, on all compatible chips, the distortion is very low.
Thanks for the great feedback Michael! I think I'll use it to measure and compare OpAmps. I have found a new board that might be better - but I'll have to wait to receive it to know that. I agree about the choice of components. I think as a test bed I'll make the cap closer to your value.
Regarding my voltage, I was considering it for a specific application - but decided against it. Low price for a test board;)
There are quite a few such boards using the 5532 (fake mostly) One of the better uses a plus & minus voltage of 15 volts and is DC coupled. Once again it has that high value feedback cap. You can run it without any cap but you may well pick up broadcast radio, not good! @@KissAnalog
Thanks Eddie, lots of fun.
It's a good thing that only cost four bucks, it sucks!
I think it could be a good test bed to test OpAmps to be sure that they work first, and that they look genuine second. I think the caps can be changed to give better freq response.
@@KissAnalog True, the cut a lot of corners like the single supply rail.
Hi Eddie, thanks again for another awesome video. Merry Christmas.😁☃️
Happy holidays! I appreciate your support!
Nice another MicroCap video, thanks😊
You Bet! Thank you!
Tuning Bode Plots of OpAmp circuits is my specialty :)
Sounds great! Any pointers are appreciated;)
Op amp shoot out sounds awesome. Have a great holiday.
Thanks! Happy Holidays!
Saw this when it came out but was busy hooking up new stereo equipment so your timing is good lol
Thanks!
Thank you !!!
I really appreciate you! Thank you!
Cheers & Merry Christmas
You are amazing! Thank you so much!
Enjoy a beer@@KissAnalog
Merry Christmas Eddie
Thanks so much!
Thanks
Thanks so much for your continued support! I really appreciate you!
More thanks for showing how to use MicroCap. The power of the filter design tool blows my mind but there just isn't support on how to use the software.
Thanks so much for your feedback. Have you seen my playlist for my tutoriial?
No, I did not! I didn't really consider you had organized a MicroCap playlist. On it.
Noise figure should be a top priority when measuring the performance of a preamp....
Thank you for this, but when is it ever measured? I'm interested in this and would like to know why it is important and what noise level is acceptable vs what number would be thought of as the ultimate target? I see the focus on THD, but never hear about noise figure - unless it is shown in an OpAmp data sheet.
I'd like to do a video on this - but this is the first comment that I have seen relating to this topic. For instance - what high end amplifier talks about noise figure?
Noise is important for preamps because anything coming out of the preamp will be further amplified by the power amp. Not only does this reduce the dynamic power potential of the amp(due to bleeding the capacitors,) noise can manifest itself as actual sound coming from a speaker(tweeter hiss being the most common.)@@KissAnalog
Opamp shoot out, yea. My IR beams are nearly 40kHz and I need hyper gain, maybe variable!
LOL Thanks!
Is the Omnicron similar in functionality to the Quantum Asylum unit? I was thinking about the Quantum Asylum unit after waching some of your other videos.
Yes but I'll have to run some comparison measurements to show the differences.
Thanks for another fine MicroCap video. I see that updates for the MicroCap software has ceased, they give you enough tools to design and create missing components. I'm running this on my Linux system under Wine just fine. Are you making your MicroCap files available so we can follow along?
-d
Thanks for the feedback! Yes - just send an email to KissAnalog@gmail.com
no , you are jim gaffigan, the comedian . jim gaffigan
LOL - thanks!
This simulation software name I given me preamplifier schematic
Thank you! Happy New Year!
Interesting how the cost of this board is now up to $8.95.
Thanks! Great point - it just went up! I wonder why it changes so much?
Here's to a very Merry Christmas and a Happy New Year!@@KissAnalog
12KHz -3dB should be more or less appropriate if you're playing old mass-market Dolby B cassettes with current-production tape decks that don't have the Dolby B reduction. People in our age group really can't hear much above 12KHz anyway. :p
I agree - but we have to think about the youngsters;) I like to design for the tech - and then no ear should be able to discern an issue;)
8:51 you talk about the input bias current offset. This is not relevant in this circuit because the amplifier is AC coupled by C5 and the DC gain is 1. The remainder of what you've said about the 330 pF capacitors is for the same reason not valid.
I actually talk about the input Voltage offset - much different than bias current. And this is completely relevant as this is how this OpAmp can work on a single input voltage. Also the gain is not 1. I think you should watch this video again and try to understand the circuit as it is obvious that you do not understand how this this circuit works. I'm sorry that you are resistant to learning - you could improve your knowledge by trying to understand how this works and what I am trying to explain .
@@KissAnalog No, you are wrong Sir. 1: You state that R1 should be equal to the parallel replacement for R5 and R3 or less than 10 K. But look carefully, R3 is AC coupled and does not affect input voltage offset which is caused by input bias current which is a DC current. 2: Input offset doesn't really matter in this circuit because the feedback network is AC coupled trough R3. As such the DC gain of this circuit is 1. You might want to correct / improve the video instead of telling me that I'm resistant to learning. But you are misguiding your viewers and that's not nice.
Oof, you have an op-amp driving a capacitive load directly???? Some op-amps won’t be very happy with that…
Thanks for bringing this up. Actually the capacitor is in series so it is not the load unless the output was shorted. I had the 20k resistor as the load, so the capacitor (large value) is part of the RC load, but the resistor is almost all of the load. Great point though.
-3dB@10kHz. This may be the worst "preamp" design I have seen. 330pF in feedback loop must be some mistake. In one of his videos, John Audio Tech has demonstrated (quite convincingly in my opinion) that it is very unlikely that there are any audible differences between opamps like 5532 and 4562. Despite that, I would still rather use 4562 as it may measure slightly better. Merry Christmas. Or Happy Holidays.
Thanks for the great feedback. I think after switching values for the 330 pF that is could be a great test bench for comparing other OpAmps - right?
I think it could be test bench. But I remember reading some horror stories about people struggling with some "faster, better" opamps. Allegedly some of them won't work properly in single rail circuits, some may require better rail decoupling than others, and so on. So most likely it is best to always verify with some instrument. @@KissAnalog