Hi guys, i have got a bunch of SC 5171/SA1930. Can these be used as drivers for 4pairs output?.
Quan
Quan
Very fast but bad SOA... Would be on the edge when using 4 Ohms load I think... Another universe then MJE or the 4883/1859.
Hi Guy's, @fireanimal has very kindly put his hand up, to offer completed and tested wolverine amplifier modules for those who are pushed for time or would just like their amplifier built by an experienced DiyAudio member.
A list of prices for such a service can be found in the PDF attached to the first post of the 2nd group buy thread
For those who are interested in this please advise me when you send me your excel order sheet and I'll pass your details onto @fireanimal and ensure he receives your blank boards ready for assembly.
A list of prices for such a service can be found in the PDF attached to the first post of the 2nd group buy thread
For those who are interested in this please advise me when you send me your excel order sheet and I'll pass your details onto @fireanimal and ensure he receives your blank boards ready for assembly.
I finally received all the parts needed to finish the boards. I have installed the IPS on the main board and powered up with a +-30VDC bench supply limited to .3amps. When I started it the bias between R111A and R111B jumped to 220mVDC. I had Q104 installed backwards on fly leads. I removed it and tested it and it was fine, so I reinstalled the correct direction, same problem. I swapped out the other IPS board to test if it was main board or IPS, same problem, so went back to original IPS. All diodes except D10 and D11 lit, there was no smoke, nothing overheated, and current draw was .01 amps on positive rail and .02 amps on negative rail. Is it possible I "smoked" Q103 having Q104 installed backwards? Not much else on the main board in the bias circuit that could "smoke" without seeing something.
I fixed the diode issue and it now has 700mVDC across R111A and R111B with both rails powered. When only the negative rail is powered it drops to 0.09mV, when the positive rail only is powered it jumps up to 700mV. I'm suspecting that I "smoked" Q10 or Q11, since with jumpers in positions D105 A and B, I created a dead short to ground. Am I on the right track?
Both Q10 and Q11 checked out and I have 1.9VDC on the base of Q105 and -2.1VDC on the base of Q106.
Hi Richard, I'm out at the moment so I'll have to study your posts and get back to you. Just checking that you have Version 21 of the build guide?
I will check that also. I am heading out to see the Drive-By Truckers. I'll be back on tomorrow.
Thanks what I was thinking and based on some of the revisions I did.
Let me know if you've lost your Dropbox link
I still have the dropbox link and have downloaded version 21. Looks like it is working perfect now after fixing my diode issue. I will thoroughly check it out tomorrow. BTW, the Drive-By Trucker concert was awesome, ended it with Angels and Fuselage.
Everything checked out perfect except the reading across TP-105 and TP-106 to rails. TP-105 to the positive rail measured 1.280VDC and TP-106 to the negative rail measured 1.339VDC. I'm using KCS3503E/KSA1381E and powered the rails from a +-32VDC bench supply.
I'm wondering if the lower voltages aren't because I have the rails set-up for 71VDC. Can I safely power one rail at a time with 64VDC and test TP-105 and TP-106? I can series the bench supply and get 64VDC.
Hi Richard, If you have followed the start-up tests listed in the build guide and everything else checks out I would say that the reason you are seeing those slightly lower voltages is your supply voltage is to low.
It's not a good idea to power up one rail at time, so please don't do that.
If you don't have a current limited DC supply that can reach 57-71vdc on both rails use the light bulb method idealy with to limit your current and a variac to increase your voltage for 35v rails up to your 71v rails
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