Products > Test Equipment
Cheap bench power supply?
shapirus:
--- Quote from: thm_w on January 30, 2024, 01:41:34 am ---Riden is Buck->linear reg..
--- End quote ---
Are you sure? Which one? The RD60xx series looks just like a usual adjustable DC/DC switching converter.
slybunda:
I do have spare laptop power adapters lying around, some hp 65w ones and dell too
Randy222:
--- Quote from: shapirus on January 30, 2024, 09:17:01 am ---
--- Quote from: thm_w on January 30, 2024, 01:41:34 am ---Riden is Buck->linear reg..
--- End quote ---
Are you sure? Which one? The RD60xx series looks just like a usual adjustable DC/DC switching converter.
--- End quote ---
Even if it were, the chopper noise is fairly large, unless RD has made some changes to their ckt's.
However, from that Dave vid, the noise appears to be ringing from silicon on/off cycles, which can perhaps be mitigated with a designed snubber. Placing it onto the PCB might however be a challenge.
thm_w:
--- Quote from: shapirus on January 30, 2024, 09:17:01 am ---
--- Quote from: thm_w on January 30, 2024, 01:41:34 am ---Riden is Buck->linear reg..
--- End quote ---
Are you sure? Which one? The RD60xx series looks just like a usual adjustable DC/DC switching converter.
--- End quote ---
Yeah you are correct, its just buck, thought there was something else under the heatsink..
--- Quote from: shapirus on January 30, 2024, 09:17:01 am ---Even if it were, the chopper noise is fairly large, unless RD has made some changes to their ckt's.
However, from that Dave vid, the noise appears to be ringing from silicon on/off cycles, which can perhaps be mitigated with a designed snubber. Placing it onto the PCB might however be a challenge.
--- End quote ---
I also recall some of the noise was injected from the source PSU. As people had varying results depending on what was used.
You are right the ringing noise is large. I'll see about testing a snubber.
Randy222:
--- Quote from: thm_w on January 30, 2024, 11:09:38 pm ---
--- Quote from: shapirus on January 30, 2024, 09:17:01 am ---
--- Quote from: thm_w on January 30, 2024, 01:41:34 am ---Riden is Buck->linear reg..
--- End quote ---
Are you sure? Which one? The RD60xx series looks just like a usual adjustable DC/DC switching converter.
--- End quote ---
Yeah you are correct, its just buck, thought there was something else under the heatsink..
--- Quote from: shapirus on January 30, 2024, 09:17:01 am ---Even if it were, the chopper noise is fairly large, unless RD has made some changes to their ckt's.
However, from that Dave vid, the noise appears to be ringing from silicon on/off cycles, which can perhaps be mitigated with a designed snubber. Placing it onto the PCB might however be a challenge.
--- End quote ---
I also recall some of the noise was injected from the source PSU. As people had varying results depending on what was used.
--- End quote ---
Not in the Dave vid. Noise from the dc-dc lunchbox PSU showed no additional noise.
It however just looked like ringing when the silicon turns off, basic LC ringing which (I think) can be dealt with fairly easy with snubber. I had a similar issue of ringing from a fet that was sinking large inductive load. I managed to squash the ringing with correct snubber.
The dandy RD buck chopper is like buying a project even before you get to use it. ;)
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