|
The Raduino used on the uBitx consists entirely of a 5v regulator, an Arduino Nano clone, an Si5351, and a standard 16x2 LCD with backlight.
toggle quoted message
Show quoted text
Power consumption is 40ma without the display, the display (mostly the backlight) sucks another 20ma. ? ??/g/BITX20/message/52886 The linear regulator is typically powered from the main 12v supply, so that Raduino heats the room with 60ma*12v = 0.72 Watts. From table 3 of the datasheet ? ?? the Si5351 with all three outputs running typically draws 22ma, this could be either a 2.5 or 3.3v rail.? So as little as 0.022*2.5v=0.055 Watts if powered from an efficient buck mode switcher. The switcher might be 90% efficient, but we don't need all 3 outputs of the Si5351. The switcher would also have to be extremely quiet, but that is possible to do. Most designs just use a linear regulator. Those Nano clones are not a good choice if going for minimum power. And the display does not need to leave the backlight on much, not at all if reflective. A well done microcontroller plus display could be down in the microamps, And you don't really need the display at all: ? ??/g/qrptech/message/386 So the Si5351 is the power hog in the VFO. A bigger power hit on receive for anything based on the 2n22xx is all that analog stuff in the IF, hard to get around it if you want the dynamic range that the 2n22xx has to offer. If you don't feel a need for the dynamic range (or a need to tinker with a good basic analog design), you may as well build another SA612 rig. The ADE-1 is $3 each (in 100's), the toroids $0.20, an Si5351 $1, PN2222's $0.02, crystals $0.20. Lots of $0.02 parts, but this could be kitted up cheaply. Here's Jim's post:?
? ? /g/qrp-tech/message/19773 Supporting the 2n22xx took a year out of his life, he's not keen to repeat that.
On Sat, Dec 14, 2019 at 03:00 PM, Michael Maiorana wrote:Reading that closely, I see nothing suggesting he would object to somebody kitting something?similar to the 2n22xx but different enough (vfo and pa?) that he can claim to?no longer be the designer.? Worth asking.? We could offer a filter for his email that discards anything from qrptech forum members. Doug might be able to enlighten us further on what Jim might think. If anybody is serious about proceeding.? (I am not.) Jerry, KE7ER
|
