paskal
New member
Help!!
guys, i need some help over here. i tried to build the scaleable non-ucd but got into some problem. as you can see, i drew my own pcb using the schematic attached. the 12v supply follows schematic from stewin mosfet based regulator.
there's no problem with the mosfet supply and it gives around 10.6v, the board powers fine from 12v-32v and current draw is only at 0.01-0.02A across the voltage (there's no short). dc offset is at around 50mV.
but when i feed it some music the DC offset jumps up and down to around 1.5V (no speaker connected). plugging in my test speakers all i can hear is screeching sound. when no music is playing the screeching sound is lower.
inductor is 20uH, output caps is 1uf, speaker load is nominal 6 ohm. i could plug it into a scope but i have no idea how to test this class D amp.
any advices from you guys are much appreciated.
guys, i need some help over here. i tried to build the scaleable non-ucd but got into some problem. as you can see, i drew my own pcb using the schematic attached. the 12v supply follows schematic from stewin mosfet based regulator.
there's no problem with the mosfet supply and it gives around 10.6v, the board powers fine from 12v-32v and current draw is only at 0.01-0.02A across the voltage (there's no short). dc offset is at around 50mV.
but when i feed it some music the DC offset jumps up and down to around 1.5V (no speaker connected). plugging in my test speakers all i can hear is screeching sound. when no music is playing the screeching sound is lower.
inductor is 20uH, output caps is 1uf, speaker load is nominal 6 ohm. i could plug it into a scope but i have no idea how to test this class D amp.
any advices from you guys are much appreciated.