Hello Everybody,
We are developing an Audio system with integrated Power supply (SMPS), which results to noise (hum). Can anybody suggest any advanced method to reduce as i have applied Filters (EMI and output). Also give the International Acceptable No-Signal to Noise Ratio.
Thanks
We are developing an Audio system with integrated Power supply (SMPS), which results to noise (hum). Can anybody suggest any advanced method to reduce as i have applied Filters (EMI and output). Also give the International Acceptable No-Signal to Noise Ratio.
Thanks
I agree with previous posters on their points. A "noisy" SMPS will usually result in all sorts of hash and spikes on the output and can take quite a bit of things to get rid of it. Good shielding - good grounds - and some good caps and a choke or two for starts. If you have a "hum" it is most likely lousy grounding - or perhaps ground loops or a crappy power trany. That's where I would be looking 1st.
As to SNR - well the higher the better but there is no "standard" to meet regarding audio gear. If you want a target to shoot for then aim for -130 or better as that will limit the noise floor for the rest of the rig.
As to SNR - well the higher the better but there is no "standard" to meet regarding audio gear. If you want a target to shoot for then aim for -130 or better as that will limit the noise floor for the rest of the rig.
I love you, oops, I mean I like your quotes.don't let the PCB designer ruin a good circuit
This reminds me of this thread, which also involves a couple of guys developing a commercial product and needing help with the design. Maybe the same project?
What do you want? The no-signal to noise?Also give the International Acceptable No-Signal to Noise Ratio.
Thanks Everybody, well its not a commercial project as we are making it for some futuristic product. Noise is a big problem, and most of the circuitry used to suppress it. I think, it has some ground problem and power supply output's low frequency amplification problem too.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Amplifiers
- Power Supplies
- Reduce Output Noise and International SNR standard