your videos are very helpfull yesterday i fixed my pioneer stero ampflier A-227 when turned the amp on to the cd player and played the cd i got crackling sound on the right channel of the speaker i thought by pushing speaker slector buttons that would solve the problem lone and behold it did not solve the problem so so yesterday i went to the home depot store and got circuit spary and i started spraying every switch and the slector nob on the amp after that i solved the problem when turned the the slector nob on the amp to cd i put in a cd and play the quality of the sound blew my mind the amp sounds like when the it come out of the factory
What are you doing with a Tektronix 24658 living on the same workbench with a $200 UNI-T?? It's like having a 2020 Rolls Royce Ghost and riding in a KIA Rio...
have the same one, can't get sound on speakers, light is on but no sound?? any experience with this? my model is sanwu TDA7498 , same processor, no bluetoot, put it on 19-20V and 5A, checked on two different power supplies and different speakers, no sound.. it's new, unpacked but no sound.. i use power supply from laptop power cable.
I wonder if this class D amp could be used as a substitute for a dead STK power module running at 39 Volt. If I remember well a class D amp needs the grounds of the output channels to be separated. One shared output ground, like in a standard amp chassis, may kill the class D amp. Anybody?
Hi. Great review. I have an old Pioneer 8ohm 3way speaker . 8" woofer I think 80 w power handling. I want to make a Bluetooth boombox powered by a 21. 6V 5Ah drill battery from HILTI.I think it can play music for 5-6 HR. Can you suggest me a decent board for this purpose? Thanks
Higher input voltage means higher output voltage and with that higher output wattage before distortion. Lower input voltage means lower output voltage and with that lower output wattage before distortion. 2x50w boards with a 12-26V input range tend to output 10-20W per channel at 12V and nearing 50W (usually with 10% distortion) at 26v. 35-40W at 26v when you dial down the gain and volume until you don't get any real distortion. If you want to amp up a pair of 50W speakers, you're better to go with a 2x100W board and then dial that down to 50W (which won't be that far since the 2x100W boards at max voltage tend to still only get to about 75W).
i use one on sony 6ohm speakers fromn an rg660....powered by a laptop psu rated at 20v 6A ......it sounds ok but my lc filters it's warmer than the other components.... can this be a problem ?
After watching this video found a excuse now to use my new Keithey 2015 THD meter that just finish overhauling. Have a few of these amp's modules laying around. Now just need to find some over 100w resistors for dummy load on feebay.
I had a question that relates to Class D. I'm thinking about buying a Class D solid state guitar amplifier, but I heard that Class D amps lose a lot of their power (more than Class A or A/B amps do) when they drive speakers above 4 ohms, and my speaker happens to be 8 ohms. Is this so? If it is, the high watts the amp manufacturer claims for the amp don't seem as impressive.
It's all relative. A 4 ohm speakers will burn up more power than an 8 ohm. Given the same power an 8 ohm will generally be louder than a 4 ohm because the lower impedence requires more current to produce the same magnetic field to move the voice coil. Watts are not everything. My tube amp is 40 watts per channel and will kick the shit out of a 100 watt ss amp every day of the week and twice on Sunday. Class d is rail to rail power so the higher your input voltage the higher the power output regardless if it is into a 4 or 8 ohm speakers.
The TDA7498E (higher voltage rated version of this chip; about $18 on ebay) you can run at 36v. It's an H-bridge output so you get ~60v P-P into 8ohms. I threw together an amp in an ammo can with a $20 amazon car EQ/preamp and use a pair of these boards (so four outputs) at 36v and it's _very_ loud indeed.
So how many watts did you get in per channel? I have the board and I ordered another one, the board isn't bad but I'm sure I don't get 100watts per channel.
The newer class D amps actually do sound fairly good. Not as good as a good class AB power amp with big MOSFET transistors, but they do sound good compared to the earlier ones. I will be doing a comparison video where I will try out several of the amp modules I have reviewed using the same speakers, same microphone, same level, and of course play the same material. That way sonic differences should be audible. I will put them up against my little 2 watt class A tube amplifier so all can be compared.
I rely on the published specifications as with class d the power is all related on input voltage. Since the PWM switching signal operates rail to rail it is relatively easy to calculate power. p=IxE where I = current and E = voltage, or E2 / R (Voltage squared divide by resistance) Class d are very clean until you try to exceed the rail voltage, then they clip, and go from 0.001% distortion to 100% distortion. I have done load tests and measured with the scope on other videos. I do not have a distortion meter for measuring THD, I have to go with the published specifications which are going to be very accurate. Remember these are prefab chip sets. Texas Instruments make the vast majority of them. They spec out the support components, and board layout. The manufacture just builds them to spec so they are all going to be very good these days. Unlike analog amplifiers where every component, and even the placement of components can and dies affect the sound.
I think you should start including in your videos real wattage those little amps give. Because we all know it cant deliver 100w per channel. Show us when it starts distorting audio signal on oscope and give us reall power those little guys give out. All in all, good video, keep it up.
Actually, the math pencils out. 36V with bridged outputs means you have have a 72v swing. That's 36V center to peak, or 36/1.4= 25.7 Vrms. V^2/R into a 6 ohm load (as specified by the data sheet), is 110W. High efficiently means little lost to heat, so it's not the beefy unit we expect to see for a 100W amp.
A lot of people have no idea how efficient and small class-D amps can be - I'm going to be playing with an IceEngine400 soon, half the area of a credit card, 400W continuous into 4 ohm, very high spec, very affordable for what it is (just needs 5 different power rails though...)
I tested this and the TPA3116 at full load and voltages with a scope and they both work according to the datasheets; doesn't clip at all until you hit the specified power limits (just determined by the p-p swing as Russell points out). Very good amps, very efficient, well protected against damage, very cheap. Just use a decent power supply
![FNAF vs TF2 - Episode 2 [SFM]](http://i.ytimg.com/vi/z5b3V2-VLb0/mqdefault.jpg)
your videos are very helpfull yesterday i fixed my pioneer stero ampflier A-227 when turned the amp on to the cd player and played the cd i got crackling sound on the right channel of the speaker i thought by pushing speaker slector buttons that would solve the problem lone and behold it did not solve the problem so so yesterday i went to the home depot store and got circuit spary and i started spraying every switch and the slector nob on the amp after that i solved the problem when turned the the slector nob on the amp to cd i put in a cd and play the quality of the sound blew my mind the amp sounds like when the it come out of the factory
What are you doing with a Tektronix 24658 living on the same workbench with a $200 UNI-T??
It's like having a 2020 Rolls Royce Ghost and riding in a KIA Rio...
have the same one, can't get sound on speakers, light is on but no sound?? any experience with this? my model is sanwu TDA7498 , same processor, no bluetoot, put it on 19-20V and 5A, checked on two different power supplies and different speakers, no sound.. it's new, unpacked but no sound.. i use power supply from laptop power cable.
I wonder if this class D amp could be used as a substitute for a dead STK power module running at 39 Volt. If I remember well a class D amp needs the grounds of the output channels to be separated. One shared output ground, like in a standard amp chassis, may kill the class D amp. Anybody?
1959Berre
Yes the speaker negative need to be isolated as it is a bridged output. Grounding or connecting together will blow it in a second.
Could you put a dummy load on the output, then a sign wave on the input and look at it on the scope.
Yes I can. Just need a couple of big 4 ohm resistors
Hi. Great review.
I have an old Pioneer 8ohm 3way speaker . 8" woofer I think 80 w power handling.
I want to make a Bluetooth boombox powered by a 21. 6V 5Ah drill battery from HILTI.I think it can play music for 5-6 HR.
Can you suggest me a decent board for this purpose? Thanks
Hi, Can we use 24volt power supply? I mean, does lower voltage affect its efficiency? Thanks for your attention. I’m looking forward to your reply.
Higher input voltage means higher output voltage and with that higher output wattage before distortion.
Lower input voltage means lower output voltage and with that lower output wattage before distortion.
2x50w boards with a 12-26V input range tend to output 10-20W per channel at 12V and nearing 50W (usually with 10% distortion) at 26v. 35-40W at 26v when you dial down the gain and volume until you don't get any real distortion.
If you want to amp up a pair of 50W speakers, you're better to go with a 2x100W board and then dial that down to 50W (which won't be that far since the 2x100W boards at max voltage tend to still only get to about 75W).
i use one on sony 6ohm speakers fromn an rg660....powered by a laptop psu rated at 20v 6A ......it sounds ok
but my lc filters it's warmer than the other components....
can this be a problem ?
I'm wondering what the pin configuration is to the Audio Input Socket shown in the picture. How can one use them?
Thanks for the video, very helpful as I have one on order. Can you let me know the name of the royalty free music played in the demo?
Hello, I am writing from Turkey. I also bought this circuit. I would have a question. How many volts and amps can I connect?
12-36V input voltage, up to 100W if using 36V
After watching this video found a excuse now to use my new Keithey 2015 THD meter that just finish overhauling. Have a few of these amp's modules laying around. Now just need to find some over 100w resistors for dummy load on feebay.
I had a question that relates to Class D. I'm thinking about buying a Class D solid state guitar amplifier, but I heard that Class D amps lose a lot of their power (more than Class A or A/B amps do) when they drive speakers above 4 ohms, and my speaker happens to be 8 ohms. Is this so? If it is, the high watts the amp manufacturer claims for the amp don't seem as impressive.
It's all relative. A 4 ohm speakers will burn up more power than an 8 ohm. Given the same power an 8 ohm will generally be louder than a 4 ohm because the lower impedence requires more current to produce the same magnetic field to move the voice coil. Watts are not everything. My tube amp is 40 watts per channel and will kick the shit out of a 100 watt ss amp every day of the week and twice on Sunday. Class d is rail to rail power so the higher your input voltage the higher the power output regardless if it is into a 4 or 8 ohm speakers.
The TDA7498E (higher voltage rated version of this chip; about $18 on ebay) you can run at 36v. It's an H-bridge output so you get ~60v P-P into 8ohms. I threw together an amp in an ammo can with a $20 amazon car EQ/preamp and use a pair of these boards (so four outputs) at 36v and it's _very_ loud indeed.
Review it again with toneboard
I wanna know how big is the difference
When you put a toneboard
I also have to class d boards with this chip they can do about 50watts or even up to 70Watts on 24v an 4Ohms
how much signal voltage it needs to obtain the rms power? and. you can meassure the power of the tda 3116d2 2.1ch 50+50+100w?? greetings
So how many watts did you get in per channel? I have the board and I ordered another one, the board isn't bad but I'm sure I don't get 100watts per channel.
Very dependent on supply voltage and load impedance. It is 2x100W at 36V 6 ohm, and probably just 2x30W at 12V.
36 volt supply at 4 ohms I bet will be real close to 100 watts per channel
How is the sound of these compared to a vintage STK-based 30 WPC receiver?
The newer class D amps actually do sound fairly good. Not as good as a good class AB power amp with big MOSFET transistors, but they do sound good compared to the earlier ones.
I will be doing a comparison video where I will try out several of the amp modules I have reviewed using the same speakers, same microphone, same level, and of course play the same material. That way sonic differences should be audible. I will put them up against my little 2 watt class A tube amplifier so all can be compared.
@@12voltvids Have you made a comparison video yet?
Rms power at 4ohm 32?v????
Does it pop on turn on and off?
Which one is better tda7498 or tpa3116d2?
Tda7498 puts out much more power. Go for it.
Where is the power output numbers? 🤦 Dude u have an oscilloscope pls measure the clean maximum power output and harmonic distortion!!
I rely on the published specifications as with class d the power is all related on input voltage. Since the PWM switching signal operates rail to rail it is relatively easy to calculate power. p=IxE where I = current and E = voltage, or E2 / R (Voltage squared divide by resistance)
Class d are very clean until you try to exceed the rail voltage, then they clip, and go from 0.001% distortion to 100% distortion.
I have done load tests and measured with the scope on other videos. I do not have a distortion meter for measuring THD, I have to go with the published specifications which are going to be very accurate. Remember these are prefab chip sets. Texas Instruments make the vast majority of them. They spec out the support components, and board layout. The manufacture just builds them to spec so they are all going to be very good these days. Unlike analog amplifiers where every component, and even the placement of components can and dies affect the sound.
Does it have any sort of overcurrent protection? Will it survive short on the output?
See the datasheet perhaps? Not rocket science any more...
how convert output L- R- to Gnd for stereo 3.1 jack for headphone and protection my headphone from high sound in this amp ?
Hello! I live in greece so they don't sell 36v power supply....Can i use 24v 5A 120w?
Thanks in advance!
Yes it will work at reduced output power. I have been running on 12 volts and they sound fine.
It's possible? mono configuration, left and right output bridge?
It is already a BTL or bridged output.
@@12voltvids ok! Thanks!
Real rms power???
I think I prefer the tube amp, this one sounds muddled?
a good class D costs a lot, unfortunately. the best class D i've ever heard is Gato Audio which costs like 4 grand
You are listening to the camera's microphone and youtube's codec, not the amplifier directly, these chips sound just fine in real life.
Does this TDA7498 board require an external preamp?
No, just give it power and line level audio and it is set. It has a volume control on it.
Sorry I'm new to this, but is a Phone's auxiliary output considered line level audio?
@@abdadkhbqefkehfkf
yes
Real 100watt x2 ??
Which sounds better tda7297 or 7498
Tda7498 3 times more powerful..
@@miteshkumar7603 Not powerful, sound better was question
Thank you... That was useful...
That circuit board uses 35v, and the IC can use up to 36v, that's annoying!
?
I think you should start including in your videos real wattage those little amps give. Because we all know it cant deliver 100w per channel. Show us when it starts distorting audio signal on oscope and give us reall power those little guys give out. All in all, good video, keep it up.
Actually, the math pencils out. 36V with bridged outputs means you have have a 72v swing. That's 36V center to peak, or 36/1.4= 25.7 Vrms. V^2/R into a 6 ohm load (as specified by the data sheet), is 110W. High efficiently means little lost to heat, so it's not the beefy unit we expect to see for a 100W amp.
A lot of people have no idea how efficient and small class-D amps can be - I'm going to be playing with an IceEngine400 soon, half the area of a credit card, 400W continuous into 4 ohm, very high spec, very affordable for what it is (just needs 5 different power rails though...)
I tested this and the TPA3116 at full load and voltages with a scope and they both work according to the datasheets; doesn't clip at all until you hit the specified power limits (just determined by the p-p swing as Russell points out). Very good amps, very efficient, well protected against damage, very cheap. Just use a decent power supply
Can i use this amplifier in car?
Yes, you can, the voltage required 8v - 32v. @ 12v you will reach 40w per channel.
@@jon123423 thanks... And how much at 32 v?
@@umarfarooq2348 Between 70 - 100w per channel depending on the quality of PSU. Direct DC will give better results.
3:30 minutes in and i just realized this video was 360p
Give it time, youtube is slow at processing. It is 1080p