That reminds me: I have a 2.1 or 3-channel board that I was building a 3-way speaker tower with small JBL drivers for my garden. Gotta get back to that. This explains why I never heard distortion even on full volume. Thanks again, John!
These chip amps are better than expected. The TDA7377 has rail-to-rail output stages. So it can operate with a very high output swing, which is good for car audio applications. The car generators typically operate the car power system at 14.4 V. The diagnosis pin 10 is useful to detect clipping. It draws 60 µA at 1% THD and 160 µA at 5% THD. So you can use a super bright white or blue LED directly against VCC for clipping signalization. The pin to pin distance of 2.54 mm within the row and 1.27 mm within both rows is also very PCB designer friendly.
Watching and listening to this video through a TDA7377. Had an old class AB amp with a chip that went out of whack and replaced it with this while using the old pre-amp with tone controls and inputs. Running the 7377 for a couple years now at around 17 volts while using the much larger heat sink of the old amp. Sounds fantastic to me! Careful as that board doesn't come with thermal paste applied.
i would love to see analisis of a stage amp like i have at work, some kind of dynacord powermixer with hybrid power stage where it does not give full voltage to output stage if the signal amplitude don't need that, basically making it run cold in low volumes while pushing up to 1000 w per channel at max volumes plus output power is software limited
As you are now testing these amplifiers in greater detail. Might be interesting if you test frequency response at half the pots rotation as opposed to full rotation. You will be surprised at the difference in some amplifiers. I was!
Amps can be sensitive to supply impedance. You should consider making a PCB with a two sets of electrolytic caps in parallel and with some very short and very thick wires (the largest that will fit into typical screw terminals. And double up the ground wire directly to the cap pins. Then insert this just before your DUT. If you really want to get nuts add two transistor capacitance multipliers before the caps.
Since the output of the amp is bridged, both leads are considered hot (not tied to ground). The analyzer as two inputs that measures the difference in voltage which is needed for measuring the bridged amplifier's outputs without shorting one side to ground which a single ended input would do.
Thanks for this! I was needing a small amp for some speakers. Im in a apartment so I cant push much power anyways. I will not buy Class D amps any more after I had one radiating RF on 145MHz that interfered with my ability to hear 2M amateur radio. That one took me a minute to figure out since it was always there, regardless of any audio going through it or not. Curious though, what kind of current was it drawing?
What I hate about this amp ic, is when You drive any speaker with crossover… Forget this 0.03% THD. You can see 4,5, or even 13%! The problem is the damping factor, due the virtual ground half power voltage circuit inside. Horrible responses, just too slow. If You have an active crossover before, and Your speakers has stabile Z in their frequency range, then this is an excellent class AB low power driver. It’s also hates bass drivers with ported boxes 😂
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Thanks for testing all your old amp boards again
Always a treat when you post tests of amplifiers.
That reminds me: I have a 2.1 or 3-channel board that I was building a 3-way speaker tower with small JBL drivers for my garden. Gotta get back to that. This explains why I never heard distortion even on full volume. Thanks again, John!
Really appreciate this test videos. Please test TDA7850 board 🙏.
Thanks for doing this video , I always learn when watching your vids , thank you
These chip amps are better than expected. The TDA7377 has rail-to-rail output stages. So it can operate with a very high output swing, which is good for car audio applications. The car generators typically operate the car power system at 14.4 V. The diagnosis pin 10 is useful to detect clipping. It draws 60 µA at 1% THD and 160 µA at 5% THD. So you can use a super bright white or blue LED directly against VCC for clipping signalization.
The pin to pin distance of 2.54 mm within the row and 1.27 mm within both rows is also very PCB designer friendly.
I keep and carry with me all the class AB/TDAs that I find. I am fascinated by the tiny size of the new chips, but these TDAs are nostalgic
Watching and listening to this video through a TDA7377. Had an old class AB amp with a chip that went out of whack and replaced it with this while using the old pre-amp with tone controls and inputs. Running the 7377 for a couple years now at around 17 volts while using the much larger heat sink of the old amp. Sounds fantastic to me! Careful as that board doesn't come with thermal paste applied.
' You are the amp man, coo cooky choo'
John is all about that bass.
Very nice video again
i would love to see analisis of a stage amp like i have at work, some kind of dynacord powermixer with hybrid power stage where it does not give full voltage to output stage if the signal amplitude don't need that, basically making it run cold in low volumes while pushing up to 1000 w per channel at max volumes plus output power is software limited
thinking about the excuse I'm going to give my family so I can spend money on an audio analyzer
E1DA Cosmos ADCiso is cheaper and better solution IMHO... 😊
Working on the same problem myself. Good luck.
As you are now testing these amplifiers in greater detail. Might be interesting if you test frequency response at half the pots rotation as opposed to full rotation. You will be surprised at the difference in some amplifiers. I was!
I'm planning on making a couple of speakers and amplify the drivers individually using dsp. These are definitely interesting to use
Nice! Tom Evans would add 20 linear power supplies to this and sell it for $30000.
$5.68 on AliExpress. Same exact board. Must be a good seller if they are peddling them years later.
Good evening. Off question here. Have you used a lot of single sided Perf-Board for permanent circuits?
I've used it on a few permanent circuits but mostly for prototyping.
Amps can be sensitive to supply impedance. You should consider making a PCB with a two sets of electrolytic caps in parallel and with some very short and very thick wires (the largest that will fit into typical screw terminals. And double up the ground wire directly to the cap pins. Then insert this just before your DUT. If you really want to get nuts add two transistor capacitance multipliers before the caps.
Sounds like your getting over your Cold John. Can you tell me what differential measuring is or means?
Since the output of the amp is bridged, both leads are considered hot (not tied to ground). The analyzer as two inputs that measures the difference in voltage which is needed for measuring the bridged amplifier's outputs without shorting one side to ground which a single ended input would do.
Sir, please test the TDA7293 amplifier on the audio analyzer.
YAH MORE TESTS LETS GOOOO!
Thanks for this! I was needing a small amp for some speakers. Im in a apartment so I cant push much power anyways. I will not buy Class D amps any more after I had one radiating RF on 145MHz that interfered with my ability to hear 2M amateur radio. That one took me a minute to figure out since it was always there, regardless of any audio going through it or not.
Curious though, what kind of current was it drawing?
Do you think you could use these for guitar or bass?
We would love if you test amplifier boards that can be commonly found in aliexpress .😇
Jat amplifier circuit please
hi why don't you make a circit of High Level input from old amp speaker output in old amp dont hv ( SUB OUTPUT
2 questions :
Can it run on 19v
Power output if I use a 8 ohms Speakers
No. 18 volts is max recommended. Add a couple diodes in series on the power supply to drop the voltage below 18v.
@@JohnAudioTech I appreciate your reply, sir. Best wishes from Kerala.
The JAT Easy Amp _Nothing But Trouble_
That's actually brilliant marketing.
What I hate about this amp ic, is when You drive any speaker with crossover…
Forget this 0.03% THD. You can see 4,5, or even 13%!
The problem is the damping factor, due the virtual ground half power voltage circuit inside.
Horrible responses, just too slow.
If You have an active crossover before, and Your speakers has stabile Z in their frequency range, then this is an excellent class AB low power driver.
It’s also hates bass drivers with ported boxes 😂
I was expecting crocs. Disappointed.