Thanks Eddie , The temperature is high for just 1 amp ! With 2 amps even higher !! better do some cooling grease between the amp and Cooler Also I like to know how hot it gets when using both of them You don’t use a noisy fan at the back of your amp at home And what influence has the fase on music quality? Thanks in advance Best regards Bert
Bert van Lelieveld YW Bert and thanks for the great questions! I’ll explain what I think the phase might do to music and power both channels in the next video.
Enjoyed this video.You going in and utilizing your test equipment. Showing what the amp can do. Hopefully you get some time and can do more hands on videos again. Just for fun I ordered some cheap DIY audio amp kits off ebay. I ordered a LM386, TDA7297, TDA2030A. I figured it would be fun to see which setup was best for powering bookshelf speakers.
Thanks for the great question! I appreciate you asking... The beauty of the Class A/B is that it is biased enough that there should be no cross over distortion. It is kind of like a Class A just about the crossover point.
LOL nice with a video I can understand without having to squeeze my brain:-) At 10:20 you have some clipping, right? You decided to turn down for the input signal, but could you not also have turned up for the supplied voltage? I am wondering, how do an amplifier react if voltage is fine but there is not enough current? ;-) to you to:-)
That’s great - I’m glad this one was easy;) I need a power supply with higher voltage. The GW Instek power supply is only rated for 30 Vdc, but it goes up a little higher than that. I’ll do a quick example to show when the current is not high enough - that’s a great question! Thank you for the great feedback and questions!
The high freq oscillation is caused because lm3886 was used with resistive load, with a speaker that oscillation disappear. This circuit is waiting for a inductive load... One colegue did a video and figure out this "problem".
That is a great question! I’ll do a video and show this - thanks for the idea and for watching! I appreciate you watching and asking the question Naresh!
Some of the distortion you see when you crank it up is high frequency oscillation. This shows the amp isn't quite stable under all conditions. It shouldn't oscillate at the clip point.
@@KissAnalogIt is usually the compensation of the driver stage being too small. You can try placing a cap across the feedback resistor or slightly increasing its value if one is present. The power supply is not usually the culprit unless you are using a regulated supply. The current peak might cause the regulator to burst into oscillation if its unstable. Hope this helps your search.
The high freq oscillation is caused because lm3886 was used with resistive load, with a speaker that oscillation disappear. This circuit is waiting for a inductive load... One colegue did a video and figure out this "problem".
Great to hear from Thailand;) Yes, you are correct. This model is the lower cost MDO, and it comes with the 2 generators built in which helps to the FRA; amzn.to/2OdW3Y5
Hi Enio - that's interesting... It could be a bad connection, or a ground issue. You could try placing a 10 ohm resistor in series with the input signal return/gnd. This might isolate the ground/loop issue - if that is what it is. Let us know how it goes...
@@KissAnalog Im learning here still...... it just dawned on me that not all "chip" amps are class D. I have a sharp cd7700 amp that claims is "digital", inside though are STK chips which Ive learned are "darlington" AB amps.
Just today I disassembled a sub which claimed to have Class D amplification, on the heatsink were dual TDA7294 chips. Checked the datasheet and these are also listed as Class AB chips, WTF!?!?
I think it could be a good option. The Yamaha has a great selection of inputs. This would need a preamp with the input connections that you want. I do have a few options that I need to get videos out on;)
Pretty wide range input Bill - thanks for the feedback. This eval card is made to make it easy to change outputs - I think I'll change it for something that I can use in some project;)
good night sir .... you try to make a power class driver ab 1000 watts. do you want to make it ... with a simple scheme but the results are satisfactory
I am from Indonesia and can not speak English ... smoothly..just rely on google .... good luck sir ... ok. I ask that you make a simple AB driver class but able to drive speakers 18 "two boxes and 15 "two boxes ... ok sir please please .........
Thanks Eddie , The temperature is high for just 1 amp !
With 2 amps even higher !!
better do some cooling grease between the amp and Cooler
Also I like to know how hot it gets when using both of them
You don’t use a noisy fan at the back of your amp at home
And what influence has the fase on music quality?
Thanks in advance
Best regards Bert
Bert van Lelieveld YW Bert and thanks for the great questions! I’ll explain what I think the phase might do to music and power both channels in the next video.
Enjoyed this video.You going in and utilizing your test equipment. Showing what the amp can do. Hopefully you get some time and can do more hands on videos again. Just for fun I ordered some cheap DIY audio amp kits off ebay. I ordered a LM386, TDA7297, TDA2030A. I figured it would be fun to see which setup was best for powering bookshelf speakers.
That sounds like a great idea. Thanks for the feedback!
Hi Eddie, very cool. Thank you for the info another great video.
YW and thanks for the feedback;)
THE THING THAT I DON'T LIKE ABOUT THAT CLASS AB AMPLIFIER IS MOST PEOPLE USE EIGHT OHM SPEAKERS HOWEVER,IT DOES HAVE IMPRESSIVE RESULTS.
Hi David, this amp works great with 8 ohm loads too. I used 4 ohms to show how it can handle that load.
forgive my ignorance but I was expecting to see crossover distortion on the output but it looked perfect.
Thanks for the great question! I appreciate you asking... The beauty of the Class A/B is that it is biased enough that there should be no cross over distortion. It is kind of like a Class A just about the crossover point.
Am I wrong if I say LM3886 distortion levels are lower than that of TDA 7293/94
LOL nice with a video I can understand without having to squeeze my brain:-)
At 10:20 you have some clipping, right? You decided to turn down for the input signal, but could you not also have turned up for the supplied voltage? I am wondering, how do an amplifier react if voltage is fine but there is not enough current?
;-) to you to:-)
That’s great - I’m glad this one was easy;) I need a power supply with higher voltage. The GW Instek power supply is only rated for 30 Vdc, but it goes up a little higher than that. I’ll do a quick example to show when the current is not high enough - that’s a great question! Thank you for the great feedback and questions!
The high freq oscillation is caused because lm3886 was used with resistive load, with a speaker that oscillation disappear. This circuit is waiting for a inductive load... One colegue did a video and figure out this "problem".
Hello sir what type board should I buy lm3886 or 2sc5200 /1943. Which sound is better for home please reply
Naresh Kumar Thanks Naresh, that’s a great question! My first thought is that they roulette both be great - but let me do a video to compare;)
What about heating on voltage regulator 7812 and 7912 transistor/ic
That is a great question! I’ll do a video and show this - thanks for the idea and for watching! I appreciate you watching and asking the question Naresh!
Thank you very much sir for replying
Thanks for the video! amazon link seems to be broken
Al Brough Thank you! Try this; amzn.to/31Aqmwg
Some of the distortion you see when you crank it up is high frequency oscillation. This shows the amp isn't quite stable under all conditions. It shouldn't oscillate at the clip point.
I’ll take some time and look at this. Not sure if it is related to the power supply or amp...
@@KissAnalogIt is usually the compensation of the driver stage being too small. You can try placing a cap across the feedback resistor or slightly increasing its value if one is present. The power supply is not usually the culprit unless you are using a regulated supply. The current peak might cause the regulator to burst into oscillation if its unstable. Hope this helps your search.
I have this very board and it sounds great but has terrible hissing sound. Do you guys know a solution other than making my own outboard psu.
Needs s Thiel Network at the output to solve the oscilation
The high freq oscillation is caused because lm3886 was used with resistive load, with a speaker that oscillation disappear. This circuit is waiting for a inductive load... One colegue did a video and figure out this "problem".
A comparison with the TDA7294 should be interesting.
I'll look into it - thanks!
lM3886 distortion level is lower than that of tda7294 but not that much ...
hi Kiss, greeting from thailand
i wonder FRA stand for Frequency Response Analysis, right?
If i have less money, which oscilloscope can do this?
Great to hear from Thailand;) Yes, you are correct. This model is the lower cost MDO, and it comes with the 2 generators built in which helps to the FRA; amzn.to/2OdW3Y5
@@KissAnalog thank you very much ;-)
looks like that the link to the board dosnt work anymore .
Thank you for telling me about this. This link should be good;)
amzn.to/3kMo6wt
Hi. I have the same board but it suffers from terrible hissing sound. Do you know how i can fix it? Thanks in advance.
Hi Enio - that's interesting... It could be a bad connection, or a ground issue. You could try placing a 10 ohm resistor in series with the input signal return/gnd. This might isolate the ground/loop issue - if that is what it is. Let us know how it goes...
@@KissAnalog im willing to give it another shot.
@@KissAnalog does the Resistor wattage matter?
I thought the LM3886 is a Class D amplifier? What am I missing here?
Thanks for asking. It actually is a class A/B, so no switching and does need some heat sinking;)
@@KissAnalog Im learning here still...... it just dawned on me that not all "chip" amps are class D. I have a sharp cd7700 amp that claims is "digital", inside though are STK chips which Ive learned are "darlington" AB amps.
Just today I disassembled a sub which claimed to have Class D amplification, on the heatsink were dual TDA7294 chips. Checked the datasheet and these are also listed as Class AB chips, WTF!?!?
Hi Is this going to be better than yamaha Yamaha A-S301 ?
I think it could be a good option. The Yamaha has a great selection of inputs. This would need a preamp with the input connections that you want. I do have a few options that I need to get videos out on;)
Surprised that it runs on only 12vdc(?)
Pretty wide range input Bill - thanks for the feedback. This eval card is made to make it easy to change outputs - I think I'll change it for something that I can use in some project;)
can you give the driver and layout scheme?
Yes I will do a video on this. Thank you for the suggestion!
@@KissAnalog that means I asked for the amplifier driver scheme
good night sir .... you try to make a power class driver ab 1000 watts. do you want to make it ... with a simple scheme but the results are satisfactory
I am from Indonesia and can not speak English ... smoothly..just rely on google .... good luck sir ... ok. I ask that you make a simple AB driver class but able to drive speakers 18 "two boxes and 15 "two boxes ... ok sir please please .........