Timeline for Is connecting a generator to the line input of an audio amplifier OK?
Current License: CC BY-SA 4.0
20 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 6, 2021 at 15:54 | answer | added | JRE | timeline score: 2 | |
| Jan 6, 2021 at 15:27 | vote | accept | chmike | ||
| Jan 6, 2021 at 15:26 | comment | added | Marcus Müller | yeah, and as Bimpelrekkie said, your amplifier is probably doing that quite sufficiently itself. | |
| Jan 6, 2021 at 15:24 | comment | added | chmike | @MarcusMüller high frequencies shouldn't affect my experiment, but it would be preferable to filter them if it is not too complex. The power is high | |
| Jan 6, 2021 at 15:24 | answer | added | danmcb | timeline score: 2 | |
| Jan 6, 2021 at 15:17 | comment | added | Marcus Müller | The amp is potentially introducing higher frequencies (hence the requirement for filtering of these, as mentioned by Bimpelrekkie) | |
| Jan 6, 2021 at 15:16 | comment | added | chmike | @MarcusMüller if I only generate sinusoids below 20kHz, how could higher frequencies affect the system ? Isn't the amp filtering higher frequencies ? | |
| Jan 6, 2021 at 15:15 | comment | added | chmike | @Bimpelrekkie thank you very much. It is very reassuring. So I can safely go on with my application. | |
| Jan 6, 2021 at 15:12 | comment | added | Bimpelrekkie | A photo of the inside of the SMSL SA 98E can be found here: amazon.com/SMSL-SA-98E-TDA7498E-Digital-Amplifier/dp/B01N19ZHVV I see 4 large inductors that will be used to filter the output signal so switching harmonics should not be any issue. | |
| Jan 6, 2021 at 15:09 | comment | added | ocrdu | Some additional info: the function generator's datasheet says the output range can be set to 0.12V, 1.2V, and 12V. Input impedance of the amp isn't specified, but the TDA7498E used in the amp has an input impedance of 69kΩ. | |
| Jan 6, 2021 at 15:09 | comment | added | Marcus Müller | @chmike well, the question is whether components >> 20 kHz "hurt" your application. | |
| Jan 6, 2021 at 15:09 | comment | added | Bimpelrekkie | A 4 ohms coil is probably OK as loadspeakers are also coils from an electronics viewpoint. | |
| Jan 6, 2021 at 15:07 | comment | added | chmike | @MarcusMüller the coil is use to generate a varying magnetic field to interact with a liquid substance in its core. I can't reveal more of the application. | |
| Jan 6, 2021 at 15:05 | answer | added | Mattman944 | timeline score: 2 | |
| Jan 6, 2021 at 15:04 | comment | added | Marcus Müller | @chmike that sounds like essentially a big mass, that will "filter out" all the higher-frequency components that might arise from the class D amplification. What is that coil used for? | |
| Jan 6, 2021 at 15:01 | comment | added | chmike | @Bimpelrekkie I didn't know that. I want to connect a 4Ohms coil to it. Would that be a problem ? | |
| Jan 6, 2021 at 15:01 | answer | added | Marcus Müller | timeline score: 3 | |
| Jan 6, 2021 at 15:00 | comment | added | Bimpelrekkie | Do I have to care about that ? No, you can simply ignore the 50 ohms and 70 Ohms as those numbers will only be relevant when you use frequencies that are much higher than 20 kHz. A BNC to RCA cable will very likely just work. Do realize that the amplifier is a class D amplifier so it has a switching output stage. For using it with a loudspeaker or a resistor, that does not matter. If you use it to drive something else there might be issues. | |
| Jan 6, 2021 at 14:57 | comment | added | Marcus Müller | Disclaimer: I'm computer scientist All creatures are welcome here. | |
| Jan 6, 2021 at 14:47 | history | asked | chmike | CC BY-SA 4.0 |