Goodday all,
I need some advice plse. This is a Sony sub which uses the Sanyo STK404-140. The IC does not last for long, I'm reasonably sure that the IC is an original, well not 100% sure🙂 I don't really overdrive it , I just wondered if I can improve maybe on the 10uf bypass caps or something like that to save the IC from committing suicide so frequently. I have thought of getting a class D amp to replace the IC.
Irs2092s 500w Mono Channel Digital Amplifier Class D HIFI Power Amp Board Fan | eBay.
Thought of this one. It is a fine sounding sub when working. Any ideas on improvement will be appreciated.🙂
This is the application suggestion, the origional has a diode on point8 whitch the Sony does not have. What would that diode do ?
I need some advice plse. This is a Sony sub which uses the Sanyo STK404-140. The IC does not last for long, I'm reasonably sure that the IC is an original, well not 100% sure🙂 I don't really overdrive it , I just wondered if I can improve maybe on the 10uf bypass caps or something like that to save the IC from committing suicide so frequently. I have thought of getting a class D amp to replace the IC.
Irs2092s 500w Mono Channel Digital Amplifier Class D HIFI Power Amp Board Fan | eBay.
Thought of this one. It is a fine sounding sub when working. Any ideas on improvement will be appreciated.🙂
This is the application suggestion, the origional has a diode on point8 whitch the Sony does not have. What would that diode do ?
Last edited:
Inside the IC. Am I correct when I say that if R712 is blown then the thermal protection will not work ? Normally the amp will work without R712 but there will be no thermal protection. So amp overheats and blows every time ?😕
Or maybe an open bias resistor making the chip run flat out ?
Or maybe an open bias resistor making the chip run flat out ?
Attachments
R712 appears to tie the substrate of the chip to ground. It looks to be one of those components that a manufacturer may include for safety, or to minimise damage when (or if) the chip fails.
The bias is set internally within the chip and looks to be a conventional vbe multiplier (connected to pin 8). Its fixed, nothing you can do can alter that.
The diode I wouldn't like to say. It may help with switch on/off behaviour in the basic circuit, something that perhaps isn't a concern if the Sony has a speaker relay circuit to eliminate noise at power on/off.
You need to be sure the IC is 100% genuine as there are lower voltage versions available in the same series and so easy to fake by marking it as something it is not.
The bias is set internally within the chip and looks to be a conventional vbe multiplier (connected to pin 8). Its fixed, nothing you can do can alter that.
The diode I wouldn't like to say. It may help with switch on/off behaviour in the basic circuit, something that perhaps isn't a concern if the Sony has a speaker relay circuit to eliminate noise at power on/off.
You need to be sure the IC is 100% genuine as there are lower voltage versions available in the same series and so easy to fake by marking it as something it is not.
Thank you sir,🙂
Yes it has dc offset protection and I see there are a lot of fusible resistors. I will check them all out and the caps on the amp board. I have ordered another IC and if it fails again I will put a class d amp in or just fix it and sell it so another person can swear at it !😀
Yes it has dc offset protection and I see there are a lot of fusible resistors. I will check them all out and the caps on the amp board. I have ordered another IC and if it fails again I will put a class d amp in or just fix it and sell it so another person can swear at it !😀
Thank you sir,🙂
Yes it has dc offset protection and I see there are a lot of fusible resistors. I will check them all out and the caps on the amp board. I have ordered another IC and if it fails again I will put a class d amp in or just fix it and sell it so another person can swear at it !😀
Yes it has dc offset protection and I see there are a lot of fusible resistors. I will check them all out and the caps on the amp board. I have ordered another IC and if it fails again I will put a class d amp in or just fix it and sell it so another person can swear at it !😀
- Status
- Not open for further replies.