Question: To getta bridge mode you have to phase shift one channel, would just reversing polarity (i.e. hook it up backwards) on one channel effectively invert the phase of that channel? If that does work would you wanna do it on the on the input side or the output side?
I am trying to bridge outputs to an old tube-type desktop radio, too, using a small amp board with Bluetooth on board. I know how to hook up a single channel (using the radio's phono input), but I can't figure out a clear-cut answer (including in this video) about how to combine the L and R outputs into one. Any tips?
So no problem to parallel connection for a BTL amplifier (class D)? Same (identical) input signal to the L and R input and then parallel the outputs? No power gains, but improved lower impedance performance?
hey thanks for the informative vid on the class D amps John. im a bit of a newcomer here for the last few months but i do enjoy the fact you go into detail and i learn a thing or two. i do have a question though, would i be able to use two of these class D amps by means of stacking (bit of a car audio term i think) ? i have one sanwu class D and im wondering if i could purchase another to improve my output. Thanks -
Say I built 2 of the exact same amplifiers and bridged their outputs. Could I just invert the signal of one of the inputs through an inverting op amp with no gain? I would test this but I don’t have an oscilloscope yet.
I put a TDA7293 on the out put of a 30 watt Bluetooth amp thingy using a transformer for coupling and it works real good. been running for a long time 24 volts.
I saw in video on that and used four 0.1 ohm resistors to level the current for the tda7297. But I have seen someone instructed to parallel without the four resistors. So my question is if this chip can be parallel connected without adding resistors?? Someone told that there is enough of resistors in the chip itself! Can that be measured somehow that it works out for tda7297 without problems? I am waiting for my two tda7297 to be delivered and plan to use one for each channel. And the speakers I plan to use dips down to 4 ohm at two occasions in the frequency span. So parallel each amp so they're driving one speaker each is my plan.
I have a question i have stereo bluetooth module and i want to split the output signal to a low pass filter and then an amp to a subwoofer and an bluetooth ouutput directly to an amp for full range now question is can i split my bluetooth output into 2 diffrent way just by soldering 2 wire for each channel?or I should get a audio splitter for that?
So just put a .1 ohm resistor in series with both the right and left channel + out of the board and then hook them together to the load? Use one channel or both channel grounds hooked together as the - ground?
Have a question ??? New to Class D amps. Im using a class D Amp with a 12 - 24 Volt DC power supply for my home speakers. The amp is rated at 100 watts per ch at 4 ohms. The speakers are 8 ohms , so does that reduce the output to 50 watts per ch. Into the speakers ??? Happy your dad is doing well 👍
Actual power (per channel) depends on the supply voltage. At 12v, max clean power is around 8 watts @ 8 ohms and 15w @4. At 24v, it is around 28w @ 8 ohms and 50w @4. 100 watts into 4 ohms is marketing fluff unless the amp can run on at least 30-32 volt supply.
Hi, i have a 2.1 TDA2030A amplifier and i wonder if i combine the output of the subwoofer to the other two chanels ... I hope i get an answer, by the way the amp is a 2x20Watt + 30Watt Sub, whit tone corector .
Hi John, I tried bridging a class d karaoke amplifier. A signal was inverted by ne5532 and it worked fine. However, I don't know the output of this amp was bridged or not. Does this damage the amp?
I did the same exact test with TDA7377, and the power consumption suddenly exploded and the heatsink got hot. Normally you expect the opposite, since the amps see double the impedance, they should work more efficiently. Do you have an explanation why?
Sorry for the late reply. Probably one of two things. 1) phasing was reversed when the output is wired up. 2) Input signal is not perfectly balanced. (you can't feed it a stereo signal. it must be the exact same signal going to both channels)
Each channel would already be in bridged configuration. Use a dual voice coil sub and connect one channel to one side and the other channel to the other side. You would need a low pass filter for each channel as well. Car stereos are usually rated at 4 ohms, so use subwoofer with each coil rated at 4 ohms.
Hello my surround speaker of my AV Receiver gone bad. Its rating is 8ohms 50watts. Can I replaced it with a 4ohms 120watts? As indicated in the unit. Need your expert advise. Thanks in advance.
You need the speaker to be the same as the matching speaker on the other rear channel. Nobody can answer your question, as you are the only one who can check the specifications of your own AV Receiver (the one in your own house) and read whether it can accept 4 ohm speakers on the rear channels. You can check this yourself.
I'd try for an oem replacement. A different speaker will have different parameters and may change the sound. Otherwise, I'd stay with 8 ohms as most AV receivers would be rated at that. Impedance may be stated on the back of the receiver near the speaker terminals.
Hi John, Can you please help me to further amplify the output of class D amp (PAM8610 ) as driver and power transistors as output device... first of all, Is it possible ??
How do i inverse signales.... First taking a mono signale then use two op-amps.... One is non-inv.... & other is inverting configuration.... Then use a POT to gain mach those..... Or just use a single transistor stage.... & 2stage to inverse these....
hi john, i have some question, how about i want to use ( 1 bluetooth tpa3118 2x30w ) and ( 2 mono tpa3118 ) for powering 4 x 3" 30W 4ohm driver? for input of each mono tpa3118, i just take from tpa3118 bluetooth ( pin 4-5 R IN )-( pin 10-11 L IN ), and parallel power input 19v 3A
![I.N "HALLUCINATION" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/n5B5q1Hwt_U/mqdefault.jpg)
Big thumbs up for the final demonstration, theory without experiments is never to be trusted.
Excelent as always, thanks so much John for all the hours you had spent teaching us amazing things, the way you do !!
Question: To getta bridge mode you have to phase shift one channel, would just reversing polarity (i.e. hook it up backwards) on one channel effectively invert the phase of that channel? If that does work would you wanna do it on the on the input side or the output side?
Thanks. Exactly what I am doing raspPi to small amp into a vintage radio w/ one speaker. Thanks again.
I am trying to bridge outputs to an old tube-type desktop radio, too, using a small amp board with Bluetooth on board. I know how to hook up a single channel (using the radio's phono input), but I can't figure out a clear-cut answer (including in this video) about how to combine the L and R outputs into one. Any tips?
8:26 to TDA7297 can I connect one 5W 16 Ohms tv speaker?? is it (TDA7297) only low frequence (bass) amplifier?
glad your dad's on the mend,
So no problem to parallel connection for a BTL amplifier (class D)? Same (identical) input signal to the L and R input and then parallel the outputs? No power gains, but improved lower impedance performance?
sir i have a tda7498e btl subwoofer amplifier, can i replace the ic with tda7498L ?
hey thanks for the informative vid on the class D amps John.
im a bit of a newcomer here for the last few months but i do enjoy the fact you go into detail and i learn a thing or two.
i do have a question though, would i be able to use two of these class D amps by means of stacking (bit of a car audio term i think) ?
i have one sanwu class D and im wondering if i could purchase another to improve my output.
Thanks -
Say I built 2 of the exact same amplifiers and bridged their outputs. Could I just invert the signal of one of the inputs through an inverting op amp with no gain? I would test this but I don’t have an oscilloscope yet.
I have TPA3116D2, I want to run it mono, how?
@JohnAudioTech How many watt is the 0.1 ohm resistors? I am going to buy resistors for the same amp, When it do 9w @4ohm. Should it be 10w resistors?
Is there a book where I can learn this ?
I put a TDA7293 on the out put of a 30 watt Bluetooth amp thingy using a transformer for coupling and it works real good. been running for a long time 24 volts.
I saw in video on that and used four 0.1 ohm resistors to level the current for the tda7297.
But I have seen someone instructed to parallel without the four resistors.
So my question is if this chip can be parallel connected without adding resistors??
Someone told that there is enough of resistors in the chip itself!
Can that be measured somehow that it works out for tda7297 without problems?
I am waiting for my two tda7297 to be delivered and plan to use one for each channel. And the speakers I plan to use dips down to 4 ohm at two occasions in the frequency span.
So parallel each amp so they're driving one speaker each is my plan.
So inverted signal is unable with this boards? Only parallel with resistors?
I have a question i have stereo bluetooth module and i want to split the output signal to a low pass filter and then an amp to a subwoofer and an bluetooth ouutput directly to an amp for full range now question is can i split my bluetooth output into 2 diffrent way just by soldering 2 wire for each channel?or I should get a audio splitter for that?
National semiconductor AN-1192 is a good read on BPO config for the technically inclined.
I want to run a single speaker on two channels. The input is not mono. Is there a way of combining the two channels to one?
This won't work. It is better to mix the input signal down to mono and use a mono amplifier.
@@JohnAudioTech Input signal won't work. But I've setteled on two speakers anyway.
Hi, can you please tell me if this stereo amp can be bridged mono in and mono out?
Pyle PFA300
If so, how would I wire it up?
Schematic?
Thanks Dave
So just put a .1 ohm resistor in series with both the right and left channel + out of the board and then hook them together to the load? Use one channel or both channel grounds hooked together as the - ground?
Have a question ??? New to Class D amps. Im using a class D Amp with a 12 - 24 Volt DC power supply for my home speakers. The amp is rated at 100 watts per ch at 4 ohms. The speakers are 8 ohms , so does that reduce the output to 50 watts per ch. Into the speakers ??? Happy your dad is doing well 👍
Actual power (per channel) depends on the supply voltage. At 12v, max clean power is around 8 watts @ 8 ohms and 15w @4. At 24v, it is around 28w @ 8 ohms and 50w @4. 100 watts into 4 ohms is marketing fluff unless the amp can run on at least 30-32 volt supply.
Hi, i have a 2.1 TDA2030A amplifier and i wonder if i combine the output of the subwoofer to the other two chanels ... I hope i get an answer, by the way the amp is a 2x20Watt + 30Watt Sub, whit tone corector .
So I can bridge a class D with a class A and what does that give you?
Can i connect 6ohm speaker in tda7297 board
Should I use the same methods to connect a stereo output of an amplifier to a single speaker?
Thanks
Hi John, I tried bridging a class d karaoke amplifier. A signal was inverted by ne5532 and it worked fine. However, I don't know the output of this amp was bridged or not. Does this damage the amp?
Can I Connect 2 Speakers To a A Cheap Chinease Amp ? with Only 1 port Output ?
ruclips.net/video/p1xNbFQ9zRE/видео.html
Look at it
I did the same exact test with TDA7377, and the power consumption suddenly exploded and the heatsink got hot. Normally you expect the opposite, since the amps see double the impedance, they should work more efficiently. Do you have an explanation why?
Sorry for the late reply. Probably one of two things. 1) phasing was reversed when the output is wired up. 2) Input signal is not perfectly balanced. (you can't feed it a stereo signal. it must be the exact same signal going to both channels)
please tell me if I have a car stereo with 4x25w output , can i use it as 2+1 amp ? How to bridge the two back outputs to drive a subwoofer ?
Each channel would already be in bridged configuration. Use a dual voice coil sub and connect one channel to one side and the other channel to the other side. You would need a low pass filter for each channel as well. Car stereos are usually rated at 4 ohms, so use subwoofer with each coil rated at 4 ohms.
I will try that . Thanks for your quick reply !
Hello my surround speaker of my AV Receiver gone bad. Its rating is 8ohms 50watts. Can I replaced it with a 4ohms 120watts? As indicated in the unit. Need your expert advise. Thanks in advance.
You need the speaker to be the same as the matching speaker on the other rear channel. Nobody can answer your question, as you are the only one who can check the specifications of your own AV Receiver (the one in your own house) and read whether it can accept 4 ohm speakers on the rear channels. You can check this yourself.
I'd try for an oem replacement. A different speaker will have different parameters and may change the sound. Otherwise, I'd stay with 8 ohms as most AV receivers would be rated at that. Impedance may be stated on the back of the receiver near the speaker terminals.
Hi John,
Can you please help me to further amplify the output of class D amp (PAM8610 ) as driver and power transistors as output device... first of all, Is it possible ??
Just buy a speaker with dual voice coils! He did answer the question correctly first off. Screw all the other boring crap that comes after!
What's the function of the .1Ohm resistors?
To help balance current sharing between the outputs.
@@JohnAudioTech if i use a stronger amplifier, do i need higher resistors??
that bridged output is kind of like American 220v outlets
We have center tapped 240VAC.
FEED YOUR DAMN CAT! Or as Dr. Jordan Peterson ssys ' clean your room. 😂
God bless you. Love your videos.
Carl Franz This is the last place in which I expected to see a quote from JP.
Paul NJ why’s that? The man says nothing that isn’t founded on fact and based in reality.
Nice !...cheers.
how to make bridge with many amplifier
What if I put them in series?
You'd need isolated supplies for each amp and would have to isolate the input grounds.
maybe if you set the second amp halfway and use the pot in the first one
You mean cannot be used as pre amp and amplifier those board?
those are amp board, not a preamp board
How do i inverse signales.... First taking a mono signale then use two op-amps.... One is non-inv.... & other is inverting configuration.... Then use a POT to gain mach those..... Or just use a single transistor stage.... & 2stage to inverse these....
Ranjan Gupta both ways are work but I like using opamp
Sound is a AC current.. by swooping the hot and the cold you change the phase.. that's what we do if we running is phase problems in live audio
Sir schematic amplifier board class gb (grounded bridge) single supply. Im froom indonesi
hi john, i have some question, how about i want to use ( 1 bluetooth tpa3118 2x30w ) and ( 2 mono tpa3118 ) for powering 4 x 3" 30W 4ohm driver?
for input of each mono tpa3118, i just take from tpa3118 bluetooth ( pin 4-5 R IN )-( pin 10-11 L IN ), and parallel power input 19v 3A
Some chips allow for master slave clock.. fforsage told that once
You could check with a scope to see if the amplifier board is using that function or not.
i love your kitty :D
cat