Hey guys, so I bought a few of these Jab2 boards, specifically the AA-JA32171 2x50 Bluetooth amp board from Sure Electronics.
I emailed them when purchasing to find out if there was any way to get them in Mono without ordering 500 of them. And they said no but sent me this email
"Please kindly understand that there are more than five parts need to be changed for the PBTL mode and all these modifications are finished by our engineers.
It wastes much time so MOQ 500 will be required. Hope that you could understand.
Here is the guidance of how to change JAB2 board into PBTL mode:
JAB2:
1. Change resistors in R6, R21, R5, R23, C26, C21 into 0 ohm resistors
2. Remove 1uf capacitor from C10 and add 1uf capacitor to C18
Maybe you can change it by yourself."
So I figured great I can just do it myself. Now that the boards are here however there seems to be some confusion. R6, R21, R23 and C26 all were empty, so I bridged all of them with 0 ohm resistors. But C21 has a 1 nf capacitor on it, and C10 is empty and C18 has a 1uf capacitor on it.
So I left C10 and C18 alone and put the 0ohm resistor on C21. And while the audio output does operate correctly, I am not getting mono, I am simply getting the left channel.
I have emailed them several times but still have not received a reply. Anybody have any suggestions on how to get true mono out of the board?
I emailed them when purchasing to find out if there was any way to get them in Mono without ordering 500 of them. And they said no but sent me this email
"Please kindly understand that there are more than five parts need to be changed for the PBTL mode and all these modifications are finished by our engineers.
It wastes much time so MOQ 500 will be required. Hope that you could understand.
Here is the guidance of how to change JAB2 board into PBTL mode:
JAB2:
1. Change resistors in R6, R21, R5, R23, C26, C21 into 0 ohm resistors
2. Remove 1uf capacitor from C10 and add 1uf capacitor to C18
Maybe you can change it by yourself."
So I figured great I can just do it myself. Now that the boards are here however there seems to be some confusion. R6, R21, R23 and C26 all were empty, so I bridged all of them with 0 ohm resistors. But C21 has a 1 nf capacitor on it, and C10 is empty and C18 has a 1uf capacitor on it.
So I left C10 and C18 alone and put the 0ohm resistor on C21. And while the audio output does operate correctly, I am not getting mono, I am simply getting the left channel.
I have emailed them several times but still have not received a reply. Anybody have any suggestions on how to get true mono out of the board?
Hey there,
I would like to achieve the same thing, so I wonder if you could make it work... I'd appreciate if you could share... Thanks...
I would like to achieve the same thing, so I wonder if you could make it work... I'd appreciate if you could share... Thanks...
I was able to get it working, however, it was super difficult to successfully swap out the capacitors, I ruined one board already.
Here is what they said after emailing them multiple times.
"Here is the guidance of how to change JAB2 boards into PBTL mode:
JAB2:
1. Change resistors in R6, R21, R5, R23, C26, C21 into 0 ohm resistors
2. Remove 1uf capacitor from C18 and add 1uf capacitor to C10"
Here is what they said after emailing them multiple times.
"Here is the guidance of how to change JAB2 boards into PBTL mode:
JAB2:
1. Change resistors in R6, R21, R5, R23, C26, C21 into 0 ohm resistors
2. Remove 1uf capacitor from C18 and add 1uf capacitor to C10"
Ive just order one of these boards in the hope to do the same thing.
Why 0 ohm resistors? Would a piece of wire work instead?
Where I live it's hard to get an components like that. Without ordering online and spending money on shipping costs.
Why 0 ohm resistors? Would a piece of wire work instead?
Where I live it's hard to get an components like that. Without ordering online and spending money on shipping costs.
Thank you Semaj4712! I got it working as well!
For anyone trying this also consider the following (taken from Sure Electronic's Website):
"PBTL (Mono) Mode Configurable
The JAB series amplifier boards offer the feature of parallel BTL operation with two outputs of each channel connected directly. To operate in this PBTL (mono) mode, apply the input signal to the RIGHT input and place the speaker between the LEFT and RIGHT outputs. Connect the positive and negative output together for best efficiency."
I was really happy when i got it to work.
Greetings!