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!
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 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
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.
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 testing all your old amp boards again
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!
Always a treat when you post tests of amplifiers.
Really appreciate this test videos. Please test TDA7850 board 🙏.
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
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!
' You are the amp man, coo cooky choo'
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
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.
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.
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.
$5.68 on AliExpress. Same exact board. Must be a good seller if they are peddling them years later.
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.
Do you think you could use these for guitar or bass?
YAH MORE TESTS LETS GOOOO!
Jat amplifier circuit please