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L-Adapter
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Old 22nd April 2019, 08:52 PM   #41
schiirrn is offline schiirrn  Germany
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Originally Posted by Salas View Post
So it ate all the source PSU's scope visible switching noises? What will be its client circuit to power?

With switch mode supplies I always measure the switching frequency and put an LC low pass on the output so the regulator doesn't have to deal with it. In my case the regulator's job mostly is decoupling and providing the supply with a low output impedance over a wide enough frequency band.

The LC filter introduces another pole but none that matters in that context.


I had a DDDAC with Pi input that I got rid off. The L-Adapter was supposed to power the Pi. I did build it anyways out of curiosity and hey, who doesn't like to build a regulator and at least measure what it does Maybe the guy who bought the DDDAC will be interested in the L-Adapter.
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Old 22nd April 2019, 09:03 PM   #42
savvas is online now savvas  Greece
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I don't think there will be many people using it for <500mA duty. I don't want to go into extremes with latest LDOs in parallel powering Rasps and PCstreamers. L Adapter seems to other good performance, reasonable consumption and it's simple enough
Tempted to build my pcb and go for Teabag's if I like it.
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Old 22nd April 2019, 09:07 PM   #43
savvas is online now savvas  Greece
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SMPS for a transformerless solution for weight's sake ?
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Old 22nd April 2019, 09:18 PM   #44
schiirrn is offline schiirrn  Germany
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In case you are adressing me: Switchers do have transformers. My "main system" is humongous in size and weight due to a load of power supplies with lots of mains transformers and chokes. Sometimes I like/have to build something more compact and simple.
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Old 23rd April 2019, 12:10 AM   #45
Salas is online now Salas  Greece
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L-Adapter
Quote:
Originally Posted by schiirrn View Post
With switch mode supplies I always measure the switching frequency and put an LC low pass on the output so the regulator doesn't have to deal with it. In my case the regulator's job mostly is decoupling and providing the supply with a low output impedance over a wide enough frequency band.

The LC filter introduces another pole but none that matters in that context.


I had a DDDAC with Pi input that I got rid off. The L-Adapter was supposed to power the Pi. I did build it anyways out of curiosity and hey, who doesn't like to build a regulator and at least measure what it does Maybe the guy who bought the DDDAC will be interested in the L-Adapter.
I tend to still discover some switching noise creeping to places through inductive coupling and ground return paths, not completely gone no matter the filtering, especially when dealing with DC to DC converters.
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Old 23rd April 2019, 07:02 AM   #46
schiirrn is offline schiirrn  Germany
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Maybe you need to switch to 3d rat's nest build instead of PCBs
Joking aside, I am far from being in a spot where I at least feel like seeing light at the end of the tunnel, especially as different types of SMPSs measure quite different. Also when looking at an FFT I mostly see harmonics of the switching frequency creeping through, often in a frequency range where I am not sure anymore if I am looking at noise from the switcher or bench noise or a combination of all the other the "stuff" going on.

Last edited by schiirrn; 23rd April 2019 at 07:02 AM. Reason: typo
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Old 23rd April 2019, 11:05 AM   #47
Salas is online now Salas  Greece
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L-Adapter
Imagine the hair pulling if there was SMPS and I had to debug where switching spikes are coupling on my old humble cassette deck's cable runs. I dug it up along with some tapes and restoring it for fun. Its a low end 2 head Lux. Seems rather alright after disassembly, Cramolin (Deoxit), and some joints rework
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Old 23rd April 2019, 02:44 PM   #48
schiirrn is offline schiirrn  Germany
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For some extra fun: take the signal directly from the head and feed it to your RIAA preamp. You need to change one time constant.
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Old 24th April 2019, 06:48 AM   #49
CallMeMike is online now CallMeMike  United Kingdom
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Quote:
Originally Posted by schiirrn View Post
For some extra fun: take the signal directly from the head and feed it to your RIAA preamp. You need to change one time constant.
That makes this cassette tape recorder a 'player' only... what about the magnificent analogue recording feature...? :-)
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Old 5th May 2019, 12:47 PM   #50
nikosokey is offline nikosokey  Greece
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Here is my test L-Adapter for filaments..
I use it to feed the filaments from my tubes 6.2V
I made my own test pcb to fit my demands box etc..
Cold start without load 6.175V , with load 10Ω start from 6.100V and stabilize finally at 6.200V-6.205V.
The dimensions of the heatsink are 6X3cm.
So my drift in me is 30mv.
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Last edited by nikosokey; 5th May 2019 at 01:14 PM.
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