Hello forum!
I have Jensen 2000.1d D-class amp, which have output switching noise which is present at the output relatively to power source ground:
Blue: VS pin of IR2010S,
(Yellow) (+ terminal).
[IMGDEAD]https://yadi.sk/i/KdhoN9am6K4VxQ[/IMGDEAD]
And at the speaker terminals (between speaker ground and + terminal) I'm getting sine wave ~150khz and 4v rms, (it's without any signal at the input).
Is there any way that this could be normal? Amp is working when signal in, though.
I know that some D-class amps self-oscillating, but thing is that before it wasn't any of that noise or sine wave at the output.
Before that all the problem was with blown some of output fets and one gate diode, I've changed them, but After some time turns out that it was also transformers failure, because all irf3205 PSU fets and couple of output 640n's blew up. I've changed them. And now I see this picture.
Amplifier photos jensen amp — Yandex.Disk)
I have Jensen 2000.1d D-class amp, which have output switching noise which is present at the output relatively to power source ground:
Blue: VS pin of IR2010S,
(Yellow) (+ terminal).
[IMGDEAD]https://yadi.sk/i/KdhoN9am6K4VxQ[/IMGDEAD]
And at the speaker terminals (between speaker ground and + terminal) I'm getting sine wave ~150khz and 4v rms, (it's without any signal at the input).
Is there any way that this could be normal? Amp is working when signal in, though.
I know that some D-class amps self-oscillating, but thing is that before it wasn't any of that noise or sine wave at the output.
Before that all the problem was with blown some of output fets and one gate diode, I've changed them, but After some time turns out that it was also transformers failure, because all irf3205 PSU fets and couple of output 640n's blew up. I've changed them. And now I see this picture.
Amplifier photos jensen amp — Yandex.Disk)