| K-amps |
Gentlemen,
Heads up, stupid question here:
Typically in a linear dual rail power supply, you'd have at least 2 power lytics after the bridges. Each one will have one prong ref to Gnd and the other on the positive or negative rails right?
Now if I want to add capacitance, I will simply paralell more caps and voila.
Here is my question: I have recently got some surplus 200V 7400 uF caps and I want to add capacitance to by BJT amp (based on an Adcom 555ii.)
Can I simply connect these to the +90 and -90 rails without connecting it to the ground in any way? I mean these caps will see 180v and not 90v...
I know it will simulate 4 times the capacitance if I had connected it in series with reference to ground, (conventional way) but my concern is, will I cause some kind of rail disbalance and blow the amp?
The main caps are already in circuit, these will just be add-ons... I know 200v caps are costly hence no one uses them in this configuration but since I have them, I thought I'd ask the question...
thanks in advance, :scratch2:
-K |
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| K-amps |
Picture attached of what I am trying to do.
C3 is the cap I want to add to the amp's current PSU, (which already have C1 and C). |
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| Nelson Pass |
It will work, but when did the 555 get 90 volt rails? This will
lower the ripple voltage, but will not do such a great job adding
to the capacity at very low frequencies. |
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| K-amps |
| quote: | Originally posted by Nelson Pass
It will work, but when did the 555 get 90 volt rails? This will
lower the ripple voltage, but will not do such a great job adding
to the capacity at very low frequencies. |
I hopped it up. :D
I used the MJ21193/4's as outputs and the MJL21193/4's as drivers. I kept the input and VA stages fixed at +/-85vdc. My next step is to up the rails to +/-95vdc. :devilr:
1) Curiously Nelson, why do you say it will not add much capacitance to the lower end.. but more importantly whta frequencies do you think will begin to suffer.
2) What if I remove C1 and C2.... I will have a dead amp right?
PS: I am surprized no one else replied and you took it upon yourself to do so (My gratitude) but I would have thought its a pretty basic question... |
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