I suggest you buy at least the E12 range of resistors
I buy 100off for ~£1.80 including tax and postage/packing in E24 range from 10r to 4m7 and a few other values from the easily available metal film, 1% tolerance, 600mW, 100ppm/C tempco
I thought I would give you a link to find that Rapidonline have stopped selling this range !
Farnell do at slightly higher cost.
Finally found the Rapidonline
https://www.rapidonline.com/vishay-...s25-1-metal-film-resistor-pack-of-100-62-7490
But the price has nearly doubled to £3.35 per 100
https://www.rapidonline.com/vishay-...s25-1-metal-film-resistor-pack-of-100-62-7490
But the price has nearly doubled to £3.35 per 100
as it happens that is exactly my target load. So I went to a local speaker shop today and got some mox resistors. Hooked 100R up as a test load aaaand ... nothing ;-) I now get 0.7Vdc and the trimpot still has no effect ... really wierd... double checked all part positions, checked for solder bridges, checked the value of R103 and the trimpot, checked the ac in voltage .. nothing... somewhere there has to be a serious flaw in my thoughts
R101 has a value of 12R for a cc of 300 mA... I used a MOX one and will exchange for a wirewound later... Q103 IDSS is 3,15mA...
andrew: thanks for the advice and the link. That is a really good idea. Will order some in the next days
SSLV for the BA-3:
i will feed the ba-3 with 24vdc. my transformer has 2x24v secondaries and 100VA. i think that the ba3 consumes ~50ma per channel. I have the minikits from teabag but i have doubts on the other components. What diodes do i have to use? MUR120 or MUR820?
i have 2 electrolitic caps 15000/35v from the F5 build, can i use them on the SSLV?
the question is, does the BA-3 needs a hot-rod version?
thank you
i will feed the ba-3 with 24vdc. my transformer has 2x24v secondaries and 100VA. i think that the ba3 consumes ~50ma per channel. I have the minikits from teabag but i have doubts on the other components. What diodes do i have to use? MUR120 or MUR820?
i have 2 electrolitic caps 15000/35v from the F5 build, can i use them on the SSLV?
the question is, does the BA-3 needs a hot-rod version?
thank you
as it happens that is exactly my target load. So I went to a local speaker shop today and got some mox resistors. Hooked 100R up as a test load aaaand ... nothing ;-) I now get 0.7Vdc and the trimpot still has no effect ... really wierd... double checked all part positions, checked for solder bridges, checked the value of R103 and the trimpot, checked the ac in voltage .. nothing... somewhere there has to be a serious flaw in my thoughts
R101 has a value of 12R for a cc of 300 mA... I used a MOX one and will exchange for a wirewound later... Q103 IDSS is 3,15mA...
andrew: thanks for the advice and the link. That is a really good idea. Will order some in the next days
Did you hook all four output wires to the 100R test load as shown in the pdf guide? Also measure the voltage drop across that 12R R101 to find what current the CCS is running. ICCS=R101V/12
As Marra said for R101 because he uses it in the same application so he knows. So MUR120 and 4700uF should suffice. Solder them like their barrels not touching the PCB so air can circulate around them.
15000uF sounds overkill and maybe oversize, you could spare them for more current demanding applications in future builds. If you must use them better use TO-220 diodes also not to wear down and break the small ones in the long term with the high inrush current.
Yes i hooked the wires up as shown in the guide.
I have 3.07V over R101 so 255 mA which sounds about right.