Hi,do you have the VRX6 420.1 schematic,esp the power supply section?I have a unit that producing some low level high pitch noise through each channel.Also I measure the dc-dc mosfet gate section is working at around 100kHz,is that the correct PWM frequency?
Thanks in advance!
Both R39(12k) and C18(1nF) measure ok with them stripe off from the board.
Funny thing is the PWM frequency remain around 36kHz for U11 output and 30kHz for U12 output,which is way beyond from the calculation,which should be around 110kHz.
Broken SG2525?
Funny thing is the PWM frequency remain around 36kHz for U11 output and 30kHz for U12 output,which is way beyond from the calculation,which should be around 110kHz.
Broken SG2525?
The osc. freq. is OK this is PUSH/PULL topology.
2X36Khz = 72Khz. if it will be 110Khz then you have problem
2X36Khz = 72Khz. if it will be 110Khz then you have problem
Hi,the DC-DC converter is fine as per u said.
I notice that out of 6 LD1.2 module,only 1 is not making any noise,while the other 5 are generating some noise around 4kHz,which u can hear them with speaker connected even no input signal at all.
Could it be the module issue?Do you have the pinout diagram of it?
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