Good work bro. Just have one suggestion next time when measuring the voltage and current output you can use a signal generator app so that you can play a constant signal like 40hz or 50hz your voltage won't flactuate kabisa and it will be easy to get your voltage and current.
BRO NICE JOB HOWEVER YOUR CONCLUSION IS MISLEADING... WE WERE TESTING THE BASS OUTPUT BUT IN YOUR CONCLUSION YOU ARE TALKING ABOUT TRANSFORMER.... i feel it's misleading coz you should have mentioned each amp had its manufacturer's power input rating
If you test the green board with a genuine toroidal transformer you'll get better power output. Most of these box transformer are less efficient, I've seen several cases of them blowing up
I think, my fan is connected directly to the motherboard. It makes alot of noise, also heard through the mids. How do I solve that?? Also if i cut the fan cable, will there be a problem??
Good stuff. A quick question though. What can I do to get clearer bass? The midrange is perfect but the bass is rough with noisy vibrations, (like in your test) Using an 8 inch, 4ohm speaker. Any ideas?
Measure the voltage with no load since when connected with a speaker there is a voltage drop.Around 30v with no load Current you measure with load. Around 3amps. Power of 90watts max,45 RMS
This is great.I didn't know how to measure the output power.Well,I have a 2.1 and was asking if it can power a 4 ohm 1000-1500 watts subwoofer,comfortably.Then,if you can have a video on how to connect boschmann equaliser to the amp,ingekua fyti.Good work!
Several factors 1. The fans, they need separate power, not from the amp board 2. These box transformers have electromagnetic effect which interfere with audio signals. If possible use toroidal transformer. 3. Lack of earthing.
Hey Bro Just a question since I heard you say that humming sound come from the fan powered from the amp Kindly advice the best method/ part to power the fans
Very simple, get 12 volts from 7812 regulator, that powers the fan, if it's distorting, use go tv adapter and fix it inside the box. Take left, right and ground signal to the amplifier inputs
Great technical knowledge bro and excellent video. We're tired of the bogus videos from other 'fundis'. As a 'fundi' myself, who likes drawing the amplifier from scratch, I wish to point out that 2ohms woofer on these amplifier is not safe for the two output power transistors. In your case the two ohms speaker wishes to pull about 145watts from that amp . This is from: -Power= V²/R Power =17²volts/2ohms. The current pulled by the 2ohms speaker will be given by POWER= V × I I= 145w/17volts Current will be about 9amps. Which is stressing the transistors and that specific power transformer. (It will overheat because it's rated for 120VoltAmps and melt) 4ohms speakers are the best for this amp for they will pull about 70watts only at their maximum.
Thats a great amplifier you got!
Thanks
Good work bro. Just have one suggestion next time when measuring the voltage and current output you can use a signal generator app so that you can play a constant signal like 40hz or 50hz your voltage won't flactuate kabisa and it will be easy to get your voltage and current.
Thanks
What's the best app to use?
BRO NICE JOB HOWEVER YOUR CONCLUSION IS MISLEADING... WE WERE TESTING THE BASS OUTPUT BUT IN YOUR CONCLUSION YOU ARE TALKING ABOUT TRANSFORMER.... i feel it's misleading coz you should have mentioned each amp had its manufacturer's power input rating
If you test the green board with a genuine toroidal transformer you'll get better power output. Most of these box transformer are less efficient, I've seen several cases of them blowing up
Nice job
I think, my fan is connected directly to the motherboard. It makes alot of noise, also heard through the mids. How do I solve that??
Also if i cut the fan cable, will there be a problem??
I did a video on that, look for external 7v to 9v, and another bigger fan, they dont make noise. Distortion is caused by ground issues
@@emmanutechnician thankyou for getting back...
i am not a technician though...where are you located??
Good stuff. A quick question though. What can I do to get clearer bass? The midrange is perfect but the bass is rough with noisy vibrations, (like in your test) Using an 8 inch, 4ohm speaker. Any ideas?
Okay, if possible you can add a bass preamp, or equalizer. You will be able change bass gain and frequency and make it sound the way you want
Can u put DC supply in this
I don't think so, it uses dual ac voltage, 24-0-24volts, AC
Can i use a 4ohm 30w speakr two of them
I think one 10 inch or 12 inch, 4 ohm sub will be enough
i have the ssame one..... different layout
You mean green board with different layout?
Can i use a 8ohm 100w speaker
Yeah but it won't be that powerful, 4ohm 100w watts and above will be better
Hi, if I want to use the green board entirely for mids, which two transistors should I remove that are responsible for subwoofer
Those two on the left side. And there is a way of converting that whole channel from bass to tweeters
Measure the voltage with no load since when connected with a speaker there is a voltage drop.Around 30v with no load
Current you measure with load. Around 3amps.
Power of 90watts max,45 RMS
Point noted, I'll try to see if it will have any change.
How can i do grounding
Follow this video
th-cam.com/video/9SQv_H6mVP8/w-d-xo.html
Where to start if there is no power n also can the green board Support 26volts
The manufacturer says 24-0-24v,
Keep it up
Wish you showed us how to cut that box
I'll show when assembling another amplifier
so which one is the best speaker for ths
Mostly SVCs, like Kenwood 3010, I also see pioneer 32s4 being used
Why is mine just the type producing a buzzing sound and around the small transsitor its burning a wire that crosses infront of the transitor
What is the voltage is your transformer?
@@emmanutechnician 24 volts
This is great.I didn't know how to measure the output power.Well,I have a 2.1 and was asking if it can power a 4 ohm 1000-1500 watts subwoofer,comfortably.Then,if you can have a video on how to connect boschmann equaliser to the amp,ingekua fyti.Good work!
Yes it can power, but make sure the rms of the subwoofer is not much. Mostly it works with Kenwood 3010, the yellow sony explod and mobile authority.
What is the cause of distortion ?
Several factors
1. The fans, they need separate power, not from the amp board
2. These box transformers have electromagnetic effect which interfere with audio signals. If possible use toroidal transformer.
3. Lack of earthing.
Is it 24 0 24 or 12 0 12,,, coz mine distortion tupu kwa bass when volume is high but iko na 12 0 12
Should be 24-0-24, 12-0-12 is too low for green board
@@emmanutechnician 48v 5amp 240w 24V-0-24V 240%3--80w for channel or 36V 5AMP 180W 18V-0-18v 180%3--60w for channel
Where are you you located i need you to fix my amp
That amp it uses speaker with 8ohms but why have you choosen to use 2 ohms
At that moment I had only that 2 ohm
Nice
Hey Bro
Just a question since I heard you say that humming sound come from the fan powered from the amp
Kindly advice the best method/ part to power the fans
Yeah, the fans need separate power,eg from 12v adapter, but not all, some boards are not distorted by the fan.
@@emmanutechnician it's the green board
So if it has that distortion fan is the cause
Hi bro siku hizi haufanyi video add more bro i normally learn from you
Nice, I will be doing more, thank you.
How to fix USB reader in this amp
Very simple, get 12 volts from 7812 regulator, that powers the fan, if it's distorting, use go tv adapter and fix it inside the box.
Take left, right and ground signal to the amplifier inputs
@@emmanutechnician thank alot bro
Good job but a transistor is not a tube nor is a tube a transistor🤣
They are almost the same. Transistors operate at lower voltages, tubes use higher voltages
Great technical knowledge bro and excellent video. We're tired of the bogus videos from other 'fundis'.
As a 'fundi' myself, who likes drawing the amplifier from scratch, I wish to point out that 2ohms woofer on these amplifier is not safe for the two output power transistors.
In your case the two ohms speaker wishes to pull about 145watts from that amp . This is from:
-Power= V²/R
Power =17²volts/2ohms.
The current pulled by the 2ohms speaker will be given by
POWER= V × I
I= 145w/17volts
Current will be about 9amps. Which is stressing the transistors and that specific power transformer. (It will overheat because it's rated for 120VoltAmps and melt)
4ohms speakers are the best for this amp for they will pull about 70watts only at their maximum.
Remember also to wekea hawa vijana a fuse wasichome cube yao 😂. These amps hate short circuiting