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Forum Index : Microcontroller and PC projects : TDA2023 mono 18W amp modules for 39c....
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9307 |
These are quite good, and appear to be genuine 2030 IC's. US$0.39 each! The TDA2030 amplifier IC is obsolete and I think discontinued, so these modules will be using up all the old-new-stock. The IC's seem genuine - laser engraved with the standard ST part ID. They don't APPEAR to be clones. IDEAL for mono annunciator type work using an array of three or four little speakers in parallel. Not very grunty, but... On-board volume trimmer. LINK.... 14W output @ 14v into 4-Ohms, 0.5% THD. Not super-HiFi by today's amp standards(and probably not that efficient either), but perfectly suitable for simple tasks. Smoke makes things work. When the smoke gets out, it stops! |
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Plasmamac Guru  Joined: 31/01/2019 Location: GermanyPosts: 554 |
na , never 14W . beware, maybe 1-2W. i know the specs but this will not work . Plasma |
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Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6790 |
Nope. Won't happen with that chip at that voltage., not even into 4Ω. The spec implies that you won't get much out of it without at least 16V - and the caps on the board (and the heatsink) won't let you use a proper voltage to get anywhere near 18W. :) Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 859 |
At some point, I need to get an understanding of this stuff. I do know that the important thing is not wattage but actual SPL (sound pressure level). I have a mobile phone that has a 3.5W speaker and man, I get a call and the entire neighborhood knows it  Heck of a bass response as well. I turn the volume down and use the back speaker for calls instead of the screen-side speaker because I detest having the screen against my face. It's kinda like using an old desk-top phone with a very full sound. Power Armor 16 Pro |
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| Plasmamac Guru Joined: 31/01/2019 Location: GermanyPosts: 554 |
122 db hifi from a phone 🤣 iam shure its loud but .. Plasma |
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| PhenixRising Guru Joined: 07/11/2023 Location: United KingdomPosts: 859 |
Machine operator was bummed because he forgot to bring his radio. This phone is one of the few with an FM radio that doesn't require an external antenna (most require that wired earbuds are plugged in). I stuck my phone out by the machine and found his radio station and he was happy as Larry...even with the machine noise.  Edit: The radio also doesn't need a data-connection. Edited 2024-01-18 21:53 by PhenixRising |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6790 |
"3.5W" would be the power *into* the speaker. It doesn't mean it is loud or quiet, that depends on the sensitivity of the speaker and whether you are listening on or off axis. A lot of people are surprised when the hear 1W per channel filling a living room with sound. Watts aren't everything. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
true Mick. sound is logarithmic, to get twice as loud as 1W would take 10W. |
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| damos Regular Member  Joined: 15/04/2016 Location: AustraliaPosts: 63 |
It isn't that complex. Power is Voltage x Current, or more conveniently V^2/R. If you want RMS power the easier way is to start with RMS voltage. The reason people like RMS is because the RMS power of an AC signal is equivalent to the same heating effect you get into a load as running a constant DC voltage into the load - it is hard to fudge. If you have a 16V supply, the best (if you are lucky) you can hope to get out of the amp is 16V peak-to-peak. This is 8V peak. RMS voltage is approximately 0.7 times that or roughly 5 volts. So the best case RMS power into 4 ohms is 5 x 5 / 4 which is around 6 watts. Supply voltage is not the only parameter as people have come up with many clever ways to get lots of power with small supply voltages, but most modules are class D or class AB and the calculations are correct for those modules. I know I have probably offended some who will have more nuanced explanations, but I have tried to keep it simple. Like all engineering, there is no such thing as a free lunch, so you are usually better off chasing efficiency than brute force. Sound pressure level is given by the efficient of your speaker and is usually quoted at 1W. I have an 18" speaker with a SPL of 103dB/W. This means that it is very loud with only 1W of power (and it is rated at 1000W). A typical 3-4" speaker will have an SPL of 83dB/W so you need to put 100W (good luck) into it to get the same sound pressure level as my 18" driver. |
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| stanleyella Guru Joined: 25/06/2022 Location: United KingdomPosts: 2129 |
if you use 2 1W amps but drive them with anti phase signals you get 4W. that's how car stereos give 40W per channel. |
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hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 713 |
FWIW my site |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9307 |
I think I touched a nerve!  Never was I suggesting this thing was capable of lots of grunt, only that you could use it for a general-purpose amplifier on the bench, or as - in my case - a simple and cheap mono amp for annunciator purposes. I mean.....for 40c, what do you expect?(rhetorical) The datasheet does say this - which is where I quoted the stats from:  Looks like @ 28v, you can get 12W from it into 4R, which sounds reasonable. Not sure what their quote above that is all about with 14W into 4R @ 14v, but perhaps it was a misprint. Perhaps they meant 4W? Smoke makes things work. When the smoke gets out, it stops! |
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phil99 Guru Joined: 11/02/2018 Location: AustraliaPosts: 2135 |
+/-14V = balanced supply WRT 0V = 28V single supply. Edit. Perhaps another special +/- symbol, there are a few empty places. Edited 2024-01-19 17:29 by phil99 |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 4234 |
Car radio systems often use 2 of these in a bridge. Volhout PicomiteVGA PETSCII ROBOTS |
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| hitsware2 Guru Joined: 03/08/2019 Location: United StatesPosts: 713 |
If you don't mind a little wiring ..... This will do ... AND ... run on 5 volt .... my site |
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| Mixtel90 Guru Joined: 05/10/2019 Location: United KingdomPosts: 6790 |
I've just got a little LM4881 headphone amp module to play with. It's only a nominal 200mW per channel, but looks very useful because the outputs are normal single-ended capacitor-isolated types so the headphone tap is grounded. Operates from 3V to 5.5V. As usual they've set the gain a bit high though, at x7. I could do to pull that down if feeding it from a DAC. Mick Zilog Inside! nascom.info for Nascom & Gemini Preliminary MMBasic docs & my PCB designs |
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