I have two problems that I hope I can get some help with.
I am in the process of updating a 3 way active system I built about 14 yrs ago.
The original setup used Audax 8", 4", & 1" drivers with LM3876 chip amps and active crossovers. I developed a problem with one 8" driver and could not get the same audax anymore. So I decided to update the whole system. I was hoping to use Class D amps and a miniDSP as the crossover.
I am currently using these TDA7498 modules 20VTO DC36V TDA7498 100W 100W Class D High Power Amplifier Board DC | eBay
[IMGHTTPDEAD]http://pcsmarts.biz/sites/default/files/amp.png[/IMGHTTPDEAD]
It's been a long time since I did any electronics, so please excuse my ignorance.
I wanted to check the noise and gain by looking at the output of the amp so I hooked up a 10 ohm 5w resistor to measure with an oscilloscope. To my surprise the amp smoked and killed the output on that channel within 30sec, why would this be?
Second problem is I am disappointed at the noise from the power amp (hence wanting to look at output). It is particularly noticeable on the tweeter and can be heard at 3-4 meters. Are there any mods that might help reduce this noise?
I am in the process of updating a 3 way active system I built about 14 yrs ago.
The original setup used Audax 8", 4", & 1" drivers with LM3876 chip amps and active crossovers. I developed a problem with one 8" driver and could not get the same audax anymore. So I decided to update the whole system. I was hoping to use Class D amps and a miniDSP as the crossover.
I am currently using these TDA7498 modules 20VTO DC36V TDA7498 100W 100W Class D High Power Amplifier Board DC | eBay
[IMGHTTPDEAD]http://pcsmarts.biz/sites/default/files/amp.png[/IMGHTTPDEAD]
It's been a long time since I did any electronics, so please excuse my ignorance.
I wanted to check the noise and gain by looking at the output of the amp so I hooked up a 10 ohm 5w resistor to measure with an oscilloscope. To my surprise the amp smoked and killed the output on that channel within 30sec, why would this be?
Second problem is I am disappointed at the noise from the power amp (hence wanting to look at output). It is particularly noticeable on the tweeter and can be heard at 3-4 meters. Are there any mods that might help reduce this noise?