LTspice says fantastically extended for flat. Keep well extended as an answer. It also says less than half Zo from what I derived with no load to 3A load mV drop method on the bench. But spice does not have copper traces and soldered screw connectors. Anyways, because not using error amplifier, moderate Zo but flat to what the various parts parasitic components would limit its logical to see as a spice answer.
Attachments
I am building my 2nd L-Adapter....
this one has a large off-board heatsink.
The L-Adapter guide, front page photograph, shows the bridge diodes as metal back packages...
but the bom has them as plastic packages D12-D15@FFPF30UP20STU
Presumably, as they are plastic packaged they can be all bolted to the communal heat-sink without isolaters ..???
and the only device that will need isolation /thermal pad is Q2 ??
this one has a large off-board heatsink.
The L-Adapter guide, front page photograph, shows the bridge diodes as metal back packages...
but the bom has them as plastic packages D12-D15@FFPF30UP20STU
Presumably, as they are plastic packaged they can be all bolted to the communal heat-sink without isolaters ..???
and the only device that will need isolation /thermal pad is Q2 ??
Last edited:
Attachments
Last edited:
Τhe bcb is donated by a friend who designed it for his personal use.
Is it something wrong posting here?
If so please feel free to delete the post.
Latest Build
My first Salas L-adapter was stock and used to power a Raspberry Pi.
This one is a little more ambitious ....
I have an HP Thin-client HP5740 with 2GB flash storage and 3GB ram.
It is running Ubuntu server and I use it to record LP's to digital files via a temp/Ram-disk and arecord.
From various junk store finds I have used : a toroidial transformer rated 21.5-0-21.5 @6Amp (using only one half so 21.5V AC.)
Wonderful openwork case from an old JVC micro/mini amp and a 200mm x 130mm heat-sink from a sub-woofer.(yet to fully finish and enclose.....)
The L-Adapter replaces the standard HP SMPS (@ 19.5v and 3.42A.)
The HP5470 boots and runs superbly.... there is no measurable voltage drop nor any flickering/dimming of the LED array.
After several hours the heat-sink is barely warm to the touch.
I have used a long umbilical from the transformer to the L-Adapter and a short cable to the HP-5740.
Using the umbilical will allow quick changes of supply/transformers and the open-work case gives easy access to change jumpers and adjust the VR.... so I can use it in other projects when not needed for LP ripping.
From the image=set the left-hand device is the HP5740, the centre is the L-Adapter and the right is the Transformer box.
My first Salas L-adapter was stock and used to power a Raspberry Pi.
This one is a little more ambitious ....
I have an HP Thin-client HP5740 with 2GB flash storage and 3GB ram.
It is running Ubuntu server and I use it to record LP's to digital files via a temp/Ram-disk and arecord.
From various junk store finds I have used : a toroidial transformer rated 21.5-0-21.5 @6Amp (using only one half so 21.5V AC.)
Wonderful openwork case from an old JVC micro/mini amp and a 200mm x 130mm heat-sink from a sub-woofer.(yet to fully finish and enclose..
...)The L-Adapter replaces the standard HP SMPS (@ 19.5v and 3.42A.)
The HP5470 boots and runs superbly.... there is no measurable voltage drop nor any flickering/dimming of the LED array.
After several hours the heat-sink is barely warm to the touch.
I have used a long umbilical from the transformer to the L-Adapter and a short cable to the HP-5740.
Using the umbilical will allow quick changes of supply/transformers and the open-work case gives easy access to change jumpers and adjust the VR.... so I can use it in other projects when not needed for LP ripping.
From the image=set the left-hand device is the HP5740, the centre is the L-Adapter and the right is the Transformer box.
Attachments
Last edited by a moderator: