A 390R would simulate your 30mA load draw at 12V. But anything form 330R to 470R would serve the purpose. Your consumption and voltage range is low, so even a 2W dummy would do. The idea is to test a reg for target use, set it, without chance of jeopardizing a real circuit as load while tweaking.
if you plan to use a shunt regulator then the CCS feeding the shunt must deliver more current than the worst case maximum demand of the client circuit (FM4).
If 30mApk is the worst case demand then the CCS should be set for 30+X mA.
X can be any value >=1mA. I would suggest you aim for setting the CCS in the range 60mA to 100mA.
Note that the FM4 has a compartment housing the 3pin regulator. One does not have much room to fit in a BiB.
Can I use this diode VISHAY GENERAL SEMICONDUCTOR|1N5399-E3/54|STANDARD DIODE, 1.5A, 1KV, DO | element14 Malaysia instead of MUR120?
It seems can support higher current and faster as compare to MUR120.
It seems can support higher current and faster as compare to MUR120.
Any diode meeting the power needs will work in the bridges. Your intuition/choice. MUR are well accepted by diyers and easy to find, thus they got proposed.
Those capacitors choices are explained thoroughly in the guide. Those near the output better be MKT plus R107,207,307 1R. 47uF polar caps and that resistor position be a jumper are reserved to battle oscillation if it rarely happens a bad interface to reactive load situation.
The C101,102 etc. Its better the 220uF polar if the application is a high gain or other noise sensitive situation. Else, just an MKT since it normally presents a more open tone. Some had used the polar, and bypassed it underneath with a small MKP.
Those capacitors choices are explained thoroughly in the guide. Those near the output better be MKT plus R107,207,307 1R. 47uF polar caps and that resistor position be a jumper are reserved to battle oscillation if it rarely happens a bad interface to reactive load situation.
The C101,102 etc. Its better the 220uF polar if the application is a high gain or other noise sensitive situation. Else, just an MKT since it normally presents a more open tone. Some had used the polar, and bypassed it underneath with a small MKP.
I have 15R 5W on hand