I would like to know how to increase the gain of this pcb to attack 2 tweeters cut in 8000 hz
NE5532 * 24 ultra baja distorsion 12W*2 Auriculares Estereo Amplificador Board Para Estereo | eBay
NE5532 * 24 ultra baja distorsion 12W*2 Auriculares Estereo Amplificador Board Para Estereo | eBay
Sounds like a lot work to change that many resistors to alter the gain.
Can you not just turn up source gain ?
Can you not just turn up source gain ?
If I'm not mistaken the one OpAmp at the input provides the gain, the rest are wired as unity gain buffers.
Mike
then I would just have to change the value to the first four?
greetings and thanks for the answers
greetings and thanks for the answers
Hola!
If the PCBs are according to D. Self's design, you can find all the information about this board here:
https://www.elektormagazine.com/magazine/elektor-201010/19460
The original had 1 PCB per channel for the bank of NE5532 acting as current buffer AND the input balanced/unbalanced voltage gain amplifier. It appears that the PCB on eBay is ONLY the current buffer part, without the voltage gain part, see screen shot below of original amplifier "5532 OpAmplifier". Good luck! Here is a link to the article by Douglas Self:
https://www.physicsforums.com/attachments/douglas_self_elektor_amp5532_compressed-pdf.254881/
In short, the PCB on eBay has gain +1 (and -1 for the balanced half) and appears to be only the bridge-tied balanced current buffer.
--Christian
If the PCBs are according to D. Self's design, you can find all the information about this board here:
https://www.elektormagazine.com/magazine/elektor-201010/19460
The original had 1 PCB per channel for the bank of NE5532 acting as current buffer AND the input balanced/unbalanced voltage gain amplifier. It appears that the PCB on eBay is ONLY the current buffer part, without the voltage gain part, see screen shot below of original amplifier "5532 OpAmplifier". Good luck! Here is a link to the article by Douglas Self:
https://www.physicsforums.com/attachments/douglas_self_elektor_amp5532_compressed-pdf.254881/
In short, the PCB on eBay has gain +1 (and -1 for the balanced half) and appears to be only the bridge-tied balanced current buffer.
--Christian
