this one i have has 12V 5Ah.it is from an old ups.the ups had 2 accumulators but due to time pass one is dead.the one left wasn`t charged for about one year and few days ago i decided to charge him up from a normal 13.7 vdc supply.
i didn`t expect him to work, but after 4-5 years on the ups and another year of ''vacation'' the accumulator measured 13.2 volts after 10 hours of recharging at 200ma without any load.
the shunt draws ~280ma and when connected to the accumulator the voltage on this(acc) initially drops to 13v and after 7-8 hours finally drops to 11.8v
almost forgotten , the first 3 hours i had 500ma current draw from the accumulator.
i didn`t expect him to work, but after 4-5 years on the ups and another year of ''vacation'' the accumulator measured 13.2 volts after 10 hours of recharging at 200ma without any load.
the shunt draws ~280ma and when connected to the accumulator the voltage on this(acc) initially drops to 13v and after 7-8 hours finally drops to 11.8v
almost forgotten , the first 3 hours i had 500ma current draw from the accumulator.
A string has more impedance to filter easier by the cap and staggers the dissipation between pieces which is a good thing. If with one fat zener, add 100-220R in series to help the filtering. They don't add up noise linearly so its not that bad using more. The cap should be bigger than when with a resistor ref (you did well with the one you used), the zeners are livelier noise sources (like pink type noise), unless we talk TC compensated defence contract style ones which are silent, though hard to come by. Any pics?
Hi Salas, compliment to You, CRT and Tea Bag for the great job with BiB 1.1v.You said many times that every new version of shunt reg is better than precedent. 1.2r is better than 1.1; correct? Have you implemented the 1.1 ver only because this version is less problematic for a lot of different circuits?
ciao
ciao
1.1 stands in the middle. Tries to break some bandwidth performance ground towards 1.2 family while retaining less components and no compound feedback pair or CCS that needs scaling. So your last phrase I borrow and change to ''I implemented the 1.1 ver NOT only because this version is less problematic for a lot of different circuits, but to improve V1 family also.'' You guys are going to decide on what V circuits are going to be subjectively more synergistic with certain applications or not. The BJT output option of BiB is as much open as 1.2 by the way, but not same low Zo.
We have given before for squeeze in this thread I remember. It was 1.0 with remote, set on high CCS.
R1, best resistors?
I am using V 1.0 (Quanghao boards) in my DAC, with great sonic results, thanks Salas/Quanghao! I will be building V 1.1 as well. I am fine tuning the regs, mostly to get the heat levels manageable, and I am wondering what most people are using for resistors to set the CCS current? Right now I need about 550-600 mA (for my 5.3 VDC DAC supply), and am using two Panasonic 3W metal films, but these resistors seem to drop their value a lot when they heat up. Is there a type/brand of resistor that would be recommended that both supports high performance (I suspect low noise is important here?) and relative temperature stability?
Thanks for any help.
I am using V 1.0 (Quanghao boards) in my DAC, with great sonic results, thanks Salas/Quanghao! I will be building V 1.1 as well. I am fine tuning the regs, mostly to get the heat levels manageable, and I am wondering what most people are using for resistors to set the CCS current? Right now I need about 550-600 mA (for my 5.3 VDC DAC supply), and am using two Panasonic 3W metal films, but these resistors seem to drop their value a lot when they heat up. Is there a type/brand of resistor that would be recommended that both supports high performance (I suspect low noise is important here?) and relative temperature stability?
Thanks for any help.
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