Has anyone used these?
In particular CMR1215S3C.
12V in +/- 15V out.
I have a noisy 24V DC plugpack and have designed a subwoofer LPF and Linkwitz transform PCB designed to feed a 200W chip amp but there is a digital whine on the output.
I have tried everything to fix it with no success so far.
It is using +/- 5V regulators and opamps.
Things that do not work: CMR inductor filters, LC filters, RC filters, star ground.
I suspect the noise is due either to:
Many here seem to use TRACO but the cheaper units are relatively high noise 70-100 mV ripple.
The Murata CMR series are low noise (~10 mV ripple) and very cheap about USD4.
Although unavailable in 24V DC in I can just denoise the 24V to 12V with a capacitance multiplier or just a 7812 regulator. It is only for an opamp cct (10mA or so).
So why aren't these more popular?
In particular CMR1215S3C.
12V in +/- 15V out.
I have a noisy 24V DC plugpack and have designed a subwoofer LPF and Linkwitz transform PCB designed to feed a 200W chip amp but there is a digital whine on the output.
I have tried everything to fix it with no success so far.
It is using +/- 5V regulators and opamps.
Things that do not work: CMR inductor filters, LC filters, RC filters, star ground.
I suspect the noise is due either to:
- regulators not good enough (I will try a version with a capacitor multiplier instead of regulator)
- incorrect reference point to ground (this is actually a SONOS compatible sub and I have gutted an IKEA Symfonisk).
Many here seem to use TRACO but the cheaper units are relatively high noise 70-100 mV ripple.
The Murata CMR series are low noise (~10 mV ripple) and very cheap about USD4.
Although unavailable in 24V DC in I can just denoise the 24V to 12V with a capacitance multiplier or just a 7812 regulator. It is only for an opamp cct (10mA or so).
So why aren't these more popular?