Using the 4 kelvin wire gives freedom in distance and keeps impedance low, the lenghts you use are no problem for the BiB. Sense is often signal wire and force thick wire, that gives unequal Ohm value, does for I know not matter in Salas his schematic. So the difference in length -to the output of the board- you describe =difference in resistance shouln't be a problem. Direct mounting on components could cause instability.
Erik
Erik
I think they are logical. But do confirm that you get 2.1V and 1.9V from your greens and reds at say 3mA so to be nearer on target. If you will join gate and source on a K117GR and take that node to (-) of a 9V battery, put a led between drain and B(+). Measure the drop across it as it lights up.
P.S. If you don't get 2.1 or 1.9 don't go looking for leds, just feed the real @ working current vf values in the calc.
P.S. If you don't get 2.1 or 1.9 don't go looking for leds, just feed the real @ working current vf values in the calc.
Looking to take the pcb routes to connector out? Could do if skipping the connector and soldering at the semis pads. Bit of messy looking and I don't know if it would present some benefit since the vias are extensions to the wires themselves. More impedance uniformity maybe by not changing transmission characteristics in a very short 4 wire situation, less joints & screws. Dissimilar length or resistance are taken care of Mr. Kelvin. The gist is IF you can aurally sense it, why not?
I think they are logical. But do confirm that you get 2.1V and 1.9V from your greens and reds at say 3mA so to be nearer on target. If you will join gate and source on a K117GR and take that node to (-) of a 9V battery, put a led between drain and B(+). Measure the drop across it as it lights up.
P.S. If you don't get 2.1 or 1.9 don't go looking for leds, just feed the real @ working current vf values in the calc.
Thanks Salas, I will do so.
I found great improvements by using obbligato gold 10u instead of BG47u for vref but that depends on what you are powering with the shunt and also on the type of vref you use.
Large caps
Merlin: I have been noting your use of large film caps for Vref filtering (for an anlog circuit) for awhile now. I understand that you subjectively prefer the performance with them, and am interested in experimenting with this approach myself. I am somewhat concerned though, with the long leads (antennas) which large caps like these will have. Do you have a 'scope (I do not) and, if so, have you looked to see if these long leads might be picking up and RF and introducing it into the circuit? I assume you have not "heard" any problems which you could attribute to RF, like coarse sounding, or extra crisp HF representation, right?
Does anyone else have experience using large caps with long leads in these positions, and thoughts or advice on whether RF pickup might be a valid concern?
Merlin: I have been noting your use of large film caps for Vref filtering (for an anlog circuit) for awhile now. I understand that you subjectively prefer the performance with them, and am interested in experimenting with this approach myself. I am somewhat concerned though, with the long leads (antennas) which large caps like these will have. Do you have a 'scope (I do not) and, if so, have you looked to see if these long leads might be picking up and RF and introducing it into the circuit? I assume you have not "heard" any problems which you could attribute to RF, like coarse sounding, or extra crisp HF representation, right?
Does anyone else have experience using large caps with long leads in these positions, and thoughts or advice on whether RF pickup might be a valid concern?
@barrows
I use 10uF 400V Auricap Vref for Legato and scope sowed a straight line without any kind of ripple, the Auricap don't use solid core & the cable is insulated so no problem to make any kind of contact with other components but if you use cap with solid core I will insulated with teflon tube to avoid contacts. Other good and cheap solution is use box caps MKP exactly the same pins distance that have the reg and bypass with small teflon in the other side of the pcbo (can be used for lytic Vref cap when using MC or digital).
I use 10uF 400V Auricap Vref for Legato and scope sowed a straight line without any kind of ripple, the Auricap don't use solid core & the cable is insulated so no problem to make any kind of contact with other components but if you use cap with solid core I will insulated with teflon tube to avoid contacts. Other good and cheap solution is use box caps MKP exactly the same pins distance that have the reg and bypass with small teflon in the other side of the pcbo (can be used for lytic Vref cap when using MC or digital).