Re: Boston Acoustics Soudware Subwoofer PowerSupply
Just measured voltages at CN3 and CN2. There is no material drop in voltage when heavy bass is played. The voltage hovers around 19.7 (CN3) and 31.8 (CN4)...
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Re: Boston Acoustics Soudware Subwoofer PowerSupply
Yes and No. By doing the subwoofer has started working meaning i can feel the vibrations in the woofer and the vibrations increase and decrease as i lower and increase the volume button in the subwoofer, but the output even at max is very much lower that what it was originally. Earlier in songs with heavy bass i could feel the punch but now its barely there.
This is the second time the power board has blown, the first time i took it to a reputed service center and they repaired it. I assumed they...
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Re: Boston Acoustics Soudware Subwoofer PowerSupply
So finally got the parts. i replaced the Zener ZD3 and C13. Voltage at CN2 is still 0. But i am getting +20V and -20V at CN3
Voltage across C3 is 315V
Voltage across ZD3 is 19V
Voltage at HO is 167V
Voltage at LO is 6V
Voltage at VS is 157V
Voltage at CN2 :
pin 1 = 0V
pin 2= -20V
pin 3 = Grnd
pin 4 = +20V
Any advice on how to trouble shoot this further. Thanks
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Boston Acoustics Soudware Subwoofer PowerSupply
Hi Folks
I am looking for help to trouble shoot my Boston Acoustics Soundware X subwoofer power PCB. The Circuit diagram is attached. I have checked the voltage across C3 (there is no capacitor as this is 240V board). The voltage i get is about 318V so i am assuming that the circuit behind that is working properly. But now I am not sure how to proceed. The circuit on the Left-hand side of the circuit is on a separate PCB that's soldered onto the board using the connector CN4 shown in the circuit diagram. So its difficult to trouble shoot components on that.
There...
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Re: Multimeter repair brymen 786
Check this video. he bypasses the knob completely to test and direct external switch. You can use it to confirm there is no issue with the knob and that power is fine.
[url]https://www.youtube.com/watch?v=UY9Myo5ngPQ[/url]
Check at time stamp 1:06:56 for the testRe: Multimeter repair brymen 786<br ...Myo5ngPQ[/url]
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Re: Multimeter repair brymen 786
Hope you have eliminated the basic checks
- Fuse Check
- Issue with the knob ([url]https://www.youtube.com/watch?v=IoRks5bJw8Y[/url])
Are they all fine ?Re: Multimeter repair brymen 786<br ...hey all fine ?Re: Multimeter repair brymen 786
Hope you have eliminated the basic checks
- Fuse Check
- Issue
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Re: Query on preventing reverse flow
Thanks folks for your responses. But does anyone have a solution for this?
One thing i can do is eliminate the -12V output.
But the other point is valid because for a fraction of a second when i switch between relays there is a possibility of 2 relays being live. The single output from the relays will go through a volt/Ammeter before going to the output banana plug. This will allow me to operate with a single volt/ammeter and output. Hence i dont want to use individual banana sockets for each output.
Any...
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Re: Query on 24V supply
can i use this voltage/source on components that have specified range of 0-24V. For eg: if i am using an IC whose VCC pin range is 0-30V can i use this power source ?
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Query on preventing reverse flow
Hi Folks
I need your help in a design problem. I have a power source that provide 3.3V, 5 V, +12V, and -12V. Each output is rated at 5A individually. Now i need to create a 4 way switch which will allow me to select the output I want. Unfortunately cannot find a 5 way rotary switch that can handle 5A. The ones i find are too big and used for main electricity board. Hence not suitable for my project.
So what i was thinking was to do the following
- Use normal 5 way rotary switch rated for 500mA.
- Connect the output of this to 4 channel 5V relay. So...
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Re: XL4015 Step-Down DC Module
Finally solved this. For whatever reason if the output voltage is kept below 2V the CC does not work. I am not sure why. I retested the whole thing with an output of 2V and the CC works perfectly. Below that it does not seem to work.
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XL4015 Step-Down DC Module
Hi Folks
I need help in trouble shooting a "XL4015 Step-Down DC Module with CV/CC Control". This is something i am trying to use to create a variable power supply which will allow me to control/limit both voltage and current. This device has an overall limit of 5A.
But when i am testing this, the voltage control works fine, but the Current control does not. I need help in troubleshooting why the CC is not working. The schematic of this device and the working is explained here [URL="https://www.electroschematics.com/dc-module/"]Schematic and explanation[/URL]...
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Re: Query on 24V supply
Yes they are rated for the same current 5A...
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Query on 24V supply
Hi Folks
have a basic question on Fundamentals. I have a Power supply that has the following terminals +12V, 0V and -12V. Now normally i can get 12V by connecting between 0 and 12 and -12V by connecting load between 0 and -12V. I can also get 24V by connecting load between -12V and +12V.
Now my queries
1. Is the 24V i get by connecting load between -12V and +12V same as connecting the load between a 0V and 24V power supply. Is there anything to take care of when using one source against the other ?
2. Now assuming there are 5A fuses between...
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Re: LED driver circuit. Burnt Resistors
Thats bad... for me. This part is not available in my country and due to COVID restrictions nothing is coming from outside.
Is there an alternative component for this?...
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Re: LED driver circuit. Burnt Resistors
I checked the resistance between CS and D and its not shorted but its not open either. The resistance is 250 Ohm....
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LED driver circuit. Burnt Resistors
Hi Folks
This has to do with a LED light driver rated for Output - DC36-65V 300mA. This is used to drive a 15W LED panel light.
Now this does not work so opened up and found 2 resistors burnt to crisp. Sensing a learning moment, i looked around the circuit to figure out that it is built around the OB2538 chip. The circuit to a large extent follows the sample application circuit mentioned in the data sheet. I have traced the actual circuit and the same is also attached for reference.
But i have some queries on this circuit
1. The resistors that burnt to crisp...
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