Timeline for Eurorack PSU design and noise
Current License: CC BY-SA 4.0
26 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 9 at 5:57 | comment | added | Ian Bland | I built a Eurorack module with a linear (transformer, bridge rectifier) PSU. Simple and not particularly costly. Generic wall warts are not going to give you a low noise solution. | |
| Mar 9 at 5:03 | answer | added | lemon | timeline score: 1 | |
| Mar 8 at 21:05 | answer | added | Justme | timeline score: 3 | |
| Mar 8 at 20:53 | comment | added | brunobhr | @Justme My point was to use cheap switch wall warts opposed to costly linear supplies exactly, hence my question. | |
| Mar 8 at 20:49 | comment | added | Justme | @brunobhr No, it is possible, but you need to select which kind of electronics they have in them. For your case of audio, do not use switch mode power supplies. Use unregulated or regulated linear power supplies. When you buy wall warts, you need to know what you are buying to know if it is suitable for what you need it. If you don't show or identify what you have now, we cannot say if these specific power supplies are suitable for your use case. Generally, devices have a label with make and model printed on them along with other info like "switch mode power supply". What reads on the labels? | |
| Mar 8 at 20:41 | comment | added | brunobhr | @Justme As I said, I just took a wild guess assuming that'd work. If that kind of PSU is impossible to make out of basic switch wall warts, I will try to find another solution | |
| Mar 8 at 20:35 | comment | added | brunobhr | Switch mode, in any case the most basic wall wart you find everywhere. en.wikipedia.org/wiki/AC_adapter#/media/… | |
| Mar 8 at 20:34 | comment | added | Justme | @brunobhr I know what warts are. I need know which exact wall warts you happen to have to help you. You might have the noisy switch mode types, or the noiseless linear types, or the unregulated typed. But I can't know which kind of wall warts you have unless you give details which wall warts you have. | |
| Mar 8 at 20:29 | comment | added | brunobhr | @Justme en.wiktionary.org/wiki/wall_wart Just regular cheap AC/DC wall warts like there are millions..what's unclear? thank you | |
| Mar 8 at 20:24 | comment | added | Justme | @brunobhr Saying that they are two 15V AC/DC wall warts means literally nothing which is why I asked for details. Whicn kind, make, model, switch mode or linear, regulated or unregulated, earth referenced or floating, knowing these kind of details are needed to solve the problem. | |
| Mar 8 at 20:21 | comment | added | brunobhr | @AndrewMorton I don't understand your question. The input is mains. Also, where should these 10nF caps be located? | |
| Mar 8 at 20:18 | comment | added | Andrew Morton | @brunobhr What noise do you observe on the inputs and the outputs of the power supplies? Maybe some extra capacitors of values like 10 nF would help: it might be easy to give it a quick check. | |
| Mar 8 at 20:12 | comment | added | brunobhr | @AndrewMorton The modules work fine when powered with my Rigol DC lab supply (no 'noise'). The modules are fresh built with new components | |
| Mar 8 at 20:10 | comment | added | Andrew Morton | @brunobhr (1) What is the noise when there is an input? (2) You've only shown some power supply circuitry. (3) Do you have any evidence that the mystery audio generation/processing modules work as you expect with any other power supply? Maybe they've gone a bit flaky with age? | |
| Mar 8 at 20:10 | comment | added | brunobhr | Also, I am totally open on another design using two wall warts as a power source! | |
| Mar 8 at 20:06 | comment | added | brunobhr | btw my mains are 230V 50Hz | |
| Mar 8 at 20:03 | comment | added | brunobhr | @AndrewMorton At the output of the module when no input is provided | |
| Mar 8 at 20:02 | comment | added | brunobhr | @Justme Like I said they are two 15V AC/DC wall warts. | |
| Mar 8 at 19:55 | comment | added | Andrew Morton | Is the noise present on the power supply rails, or might it be induced onto the amplifier inputs somehow? Where in the circuit are you detecting noise? | |
| Mar 8 at 19:55 | comment | added | Justme | The power supplies that provide power to your regulator are unknown. Please tell what they are, how they are connected to your regulators, and how they connect to some upstream power source like mains voltage. | |
| Mar 8 at 19:46 | comment | added | brunobhr | @AndrewMorton The Eurorack modules generate or process audio signals | |
| Mar 8 at 19:44 | comment | added | brunobhr | @AndrewMorton By noise I mean a signal added to the signal I send | |
| Mar 8 at 19:26 | history | edited | brunobhr | CC BY-SA 4.0 |
added 124 characters in body
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| Mar 8 at 19:06 | comment | added | Andrew Morton | Is it possible that what you describe as noise, others would describe as signal? Why not? | |
| Mar 8 at 19:03 | comment | added | Andrew Morton | Does the noise have a distinct frequency? What do the Eurorack modules do? | |
| Mar 8 at 19:00 | history | asked | brunobhr | CC BY-SA 4.0 |
