Also see that you have set high enough current limit for the load current demand you try to power.
And use bigger sinks next time. Those you got are really small for a shunt regulator even if you manage to fix the mistake.
I mean, radiators for transistors?
I hope the board developer did everything right. (he wrote that he tested it)
I hope I made a mistake somewhere
I hope the board developer did everything right. (he wrote that he tested it)
I hope I made a mistake somewhere
I replaced Q2, M1, M2 and everything worked...
only M1 gets very hot) radiators are probably needed more
only M1 gets very hot) radiators are probably needed more
I didn’t understand with “R1”, I just couldn’t find the resistors (
I bought 3.3 ohm resistors, will they suit my requirements?
I put a table in Excel and took the information on mA from the datasheet.
I bought 3.3 ohm resistors, will they suit my requirements?
I put a table in Excel and took the information on mA from the datasheet.
Whatever total mA load add 100mA more for headroom (mAFinal). Then calculate R1=600mV/mAFinal.
3.3 ohm, suitable for -5V and +5V?
The minus shows 2.5 ohms. Plus, shows 3.3 ohms in the table.
Can I put 3.3 also for the minus? Instead of 2.5? How critical is a difference of 0.08 ohm?
Yes, I accidentally added an extra zero.
I had to buy an additional 0.75ohm
to reduce 3.3 ohms.
How important is the quality of resistors?
And what resistors require quality?
All will work but 100ppm class for R1 is good if you can. Mox or even better metal film. Power rating is not high because only 600mV on the resistor. 1W-2W for your current levels.
For R1 (All the rest are ordinary)
VISHAY Sfernice 3W, Carbon Film Resistor, Ceramic Composition
VISHAY Sfernice 3W, Carbon Film Resistor, Ceramic Composition
Thanks! This is a heavily modified DDDAC so I redesigned some stuff. I can send you the design in the conversations area.
ps: I also designed the pcb and case (if drilling the case can be called designing🤣).