The amplifier module with PAM8610 has a power connector, terminals for connecting speakers, a minijack input and a volume control potentiometer. The kit includes a small heat sink to stick to the PAM8610 chip. Class D declared by the seller suggests energy efficiency, while the possibility of working at 12V may allow for power supply from a gel battery. Module to be found in online stores by searching for the phrase: PAM8610 .
When testing the PAM8403, it turned out that the circuit at the output generates "chaff", while the current consumption is increased when we connect the 8om resistor at the output instead of the loudspeaker (with measurable inductance).
After connecting the module with the PAM8610, it turned out that without the presence of an input signal in the speakers it is present noise louder than in PAM8403 . The attempt to listen to the music was successful, the quality is acceptable.
The module was powered with 15V, 8 ohm resistors were connected to the outputs. In the absence of an input signal, the output is quite clear, causing the noise mentioned above:
As with PAM8403, with PAM8610 the current consumption depends on the type of load (inductance). If there is no input signal with disconnected speakers, the system uses 26mA, connecting 8ohm speakers is 30mA consumption, connecting 8ohm resistors is 41mA, and with 4ohm resistors 44mA. The differences in power consumption are much smaller than with the PAM8610.
The test system was powered with 15V, 8 ohm resistors were connected.
After giving the 1kHz signal, the familiar PAM8403 "chaff" appears on the output:
The output voltage of 2.8V at a resistance of 8 ohms corresponded to the output power of 2x1W, current consumption at 15V was 0.423A, i.e. power consumption ~ 6.345W and efficiency ~ 32%.
2x5W power with an output voltage of 6.3V, required the delivery of 15V * 1.087A = 16.305W which gives the efficiency ~ 61% warm system.
Power 2x10W at a voltage of 8.9V on a resistor 8ohm, power consumption 15V * 1.731A = 25.965W which gives an efficiency of ~ 77%, the system is very warm.
The method of measurement is debatable, which was described in the previous material https://www.elektroda.pl/rtvforum/topic3458041.html but the amplifier module is also unusual, the output signal is very different from a typical class D amplifier, eg TDA8932.
There are two jumpers on the board, one is closed (power on), the other is open (mute).
What do you think about the cheap PAM8610 amplifier module, where can it be used?
A module like a module ... An amplifier like an amplifier. Nothing fancy except that it is small and cheap.
where can it be used?
The quality is not a sin because it is not designed for professional (audiophile) applications. As described previously - it is to be cheap, efficient and "powerful" (to the best of its abilities) and at the same time economical for power supply. Taking the above into account, the applications impose themselves - battery powered portable audio devices - And since recently it is fashionable to build portable MP3 players preferably with radio and BT - this (and previous) module is ideal for such applications as a power amplifier.
With this efficiency it is comparable to the old tda2003 where the sound quality at this voltage is better.
These amplifiers have one major drawback. They have to work with the loudspeaker because of the inductance and possibly short wires. Hence the visible chaff. Each such type of amplifier lacks an LC filter at the output. Using such a filter will improve the efficiency and quality of the signal, and the difference between the loudspeaker and the resistor will disappear.
Class D profit does not differ from AB in the maximum efficiency 100% vs 78%! Only from her character, which is little to talk about. The efficiency of the linear amplifier (AB) is proportional to its drive and reaches a maximum of 78%, which results only from the sine shape. A class D amplifier is theoretically 100% efficient over its full control range!
Class AB amplifier for square wave also has a theoretical maximum efficiency close to 100% !!
Added after 7 [minutes]:
What do you think about the cheap PAM8610 amplifier module, where can it be used?
The module makes all the other big and expensive car TDAs a thing of the past, very hot and requiring heat sinks. Thanks to him, it became possible to make portable speakers of high power, playing much longer than on line tips. For me it is a revelation that the choice of a larger arrangement is even better. I ordered a piece of each genre for ali and only such a comparison makes sense! Because the fact that class D has replaced AB has been a fact for a long time!
And in mobile phones / smartphones do you think you have AB? Also D and also without output chokes
You could also think that when something is designed with an audiophile in mind, it becomes an audiophile product as a rule. Anyway, it is like that on the forums No matter what system it is important that audiophile parts and a gold plate
If someone wants to describe his tests on the electrode and has an idea for a sensible use of the system, the possibility of testing, or want to get acquainted with this type of amplifier, I have 1 piece module PAM8610 to share in exchange for describing your attempts.
Hello. Today I tried to replace the amplifier in the Polish boombox. Unfortunately, this amplifier generates some strange +15 and -15V single noise pins with and without load. All attempts to filter the power supply and insert chokes in series with the speakers did not bring any results. The noises and murmurs disqualified him from working. At one point there was smoke and fire (for no reason, it seems). RIP. If someone works with this amplifier correctly, please let me know. I put the PAM8403 into the damaged JBL Flip and there, powered from USB, it sounds pretty good (without measurements).
Apart from the noise in the absence of the PAM8610 signal, there was no question of a cube explosion, the system worked stably (power consumption), with no signal, overdrive, presence and no load at the output.
The problem is that no one has reliably tested the module or even measured its basic parameters. And the fact that someone can not apply it, as a consequence of which the scalak exploded, has nothing to do with quality.
And how does the quality of the popular TDA automotive chipset ...? Their parameters are also average. Maybe, for the test to be reliable, both solutions should be compared?
Saying that there are some strange pins appearing on the output, suggesting that they shouldn't be there is no test of any kind. This is simply the incompleteness of the tester.
And how does the course on each of the outputs look like, i.e. plus and minus of the loudspeaker separately in relation to the mass? Who of you measured it?
Only that it is not a ready device that can be turned on by everyone. This is an electronic module that needs to be applied! All you have to do is loop the ground between the power ground and the signal ground and you have the effect :)
I have this module, I connected it and it works for others too. If it didn't work, nobody would produce it. So so far the fault lies with the poor professional!
Please. It was enough to add simple RC filters to the outputs to show the audio waveform. The oscilloscope math function puts two waveforms together and we have a sine wave. The tip works in the bridge, so you should not connect the mass of the oscilloscope to its output. It is possible if the mass of the oscilloscope / generator are not connected to each other, e.g. with ground. But the resulting waveform will contain a large component of 50hz mains noise.
The oscilloscope now shows that the modulation used is unipolar. For one half of the signal, one output is grounded (PWM drops to zero fill) the other is modulated (PWM increases from minimum to maximum). For low signals, we have bipolar modulation, on both outputs there is a PWM signal with low filling.
Another important piece of information is the large gain of the module with the value of 32dB or 40 times, which gives the sensitivity of 200mV.
The PAM8610 circuit has the ability to adjust the volume using DC voltage. I think there are two types of volume control modules. In one there is a mono potentiometer which, by changing the voltage on the appropriate pin, regulates the volume. In the second stereo (in the picture above), it probably only changes the attenuation of the audio signal. In the black modules without pot, the volume control is turned off and the full gain is 32dB. Scalak also has differential inputs to avoid the hassle of the mass loop, as far as I can see this has not been used in the modules.
One should also mention the power supply of the module. PAM8610 works in the voltage range 7-15V (max. 16.5V). With a load of 2x4ohms and 12V, the output power reaches 2x15W for audio waveforms and high efficiency, it will give about 1A of average power consumption (average power for music is about 30% of maximum power). It might seem that a 12V 1A power supply is enough to power it. Unfortunately, it may not be enough, because the maximum current pulses reach over 5A! 1-2A power supply may turn off! Using a 5-6A (> 60W) power supply seems pointless. The unregulated power supply is also dropped due to the large voltage drop. In fact, the only sensible power supply is a 12V battery or 3 Li cells.
On each output 4k7 and 10nF to ground. Output to the oscilloscope with capacitors. Such values give the limit frequency of about 4khz, so they filter the carrier well, which is about 300khz, but you can watch the signal of 1khz or lower.
I also tried the filter twice on each output and one capacitor between them and the oscilloscope. The waveform was ok, but the mass of the oscilloscope was connected to the output of the amplifier and there was a lot of noise at 50hz.
Sometimes I use a filter as shown below or the same capacity is only half the size. This one is suitable for measuring bandwidths up to around 20kHz and a 1kHz square response. It is a passive filter so it does not make "ringing". I also use LC filters and active 20khz 54dB / oct to measure noise and distortion. In the future, he will probably assemble the AES17 filter, because there is a schematic available.
Added after 3 [minutes]:
I have a black module without pot and without a lot of power. The Class D amplifiers need a solid LESR capacitor in their power supply. After adding it, the amplifier unfortunately turns off with a squeal and a crack.
Check whether your potek module regulates the audio signal or the voltage on the chip?
So this module with a single pot must regulate the voltage on the cutter volume and thus the volume but through the internal circuits of the IC. It is possible that this way the amplifier has less noise with less gain.
Added after 1 [minutes]:
Here is the module: https://pl.aliexpress.com/item/Super-Slim-2-x...mplifier-Board-12V/32790003809.html?spm=a2g17. search0220.127.116.11ee248f2mccmbw & ws_ab_test = searchweb0_0, searchweb201602_1_10152_10151_10065_10344_10068_10342_10325_10546_10343_10340_10548_10341_10698_10696_10084_10083_10618_10304_10307_10059_308_100031_10103_10624_10623_10622_10621_10620, searchweb201603_1, ppcSwitch_5 & algo_expid = d1ae39cb-22cd-4336-b12e-024039c6806f-33 & algo_pvid = d1ae39cb-22cd-4336-b12e-024039c6806f & transAbTest = ae803_1 & priceBeautifyAB = 0
Transistor on, zero drop, zero loss, transistor off zero pard, or zero loss, and you have 100%.
I am asking for the symbol of this transistor with zero drop, i.e. zero resistance. I don't know, maybe I don't know something, I'm old and backward. MOS has, for example, 20 milli ohms but it is not zero. So we're going into superconductors. How much energy is needed for a superconductor to work?
Unfortunately, you are picking on your friend and you don't want to understand what he is writing about or you think you know.
The theoretical efficiency of an amplifier in class D is 100% additionally regardless of the level of control.
The theoretical efficiency of an amplifier in a shallow AB class depends on the level of control and reaches a maximum of about 78%. This number is due to the shape of the sine wave.
Because for the rectangle, it is also theoretical 100% (with full control)
The practical difference in efficiency between class D and AB is not 100% -78%, which would be for maximum control. For music it is much bigger because the average efficiency of an AB amplifier depends on how loud you listen. In practice, with loud listening it oscillates around 50% and with quiet it is close to 0%. So we work in the range of 0-50% in the case of the clade D amplifier, from small signals we achieve a practical efficiency of around 90%.
What, buddy, do not understand, I will gladly explain? I have been dealing with amplifiers for nearly 30 years, so I know what I am writing.
Do you have such problems that it sows you on the VHF? Because in the basement he effectively disrupted all stations. Do you think it would need to be screened? And don't you have these nasty noise-distortion at low volume? Now I don't remember them anymore, because his life was short (but I made a short circuit), but you got me up so much that the next one is coming to me. I made a hybrid from the boombox, a combination of radio and TV - Condor + Siesta 3A and it even has a kick.
Some time ago, while placing an order for electronic parts, I bought a module for PAM8403 "by the way". It made a very positive impression on me, so I ordered several modules for the PAM8610. Black module, no PCB potentiometer. After the first enthusiasts, unfortunately, a serious flaw of the system emerged - it is not suitable for heavy playing. The system starts to fade with strong control. I see the circuit primarily as an amplifier for a portable loudspeaker - and here the realities are that it was played "just louder" more than once, and the fact that it wheezes did not bother anyone at some point. This is how my previous TDA1557Q product was tortured, which I decided to replace with a "digit" in order to extend the battery life and, unfortunately, as it turned out, PAM8610 is NOT SUITABLE for such use. You can forget about working with a 2x4R load. even on 2x8R (and audible distortion) it likes to turn off. I will add that it is rather an overcurrent protection, not a thermal one, the amplifier behaves in the same way with small heat sinks on the chip and under it, as well as after their complete removal. It is a pity, it was close to the 'ideal'. The amplification is "hand in hand" - practice has shown that not every phone has a sufficient signal level at the headphone output to fully drive the amplifier. A few more dB of reserve would be good here. Well, unless these modules are not set to maximum gain? Because to be honest, I did not check - it does not make sense, since you have to be careful not to overload it anyway, because it will turn off ...