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Old 23rd April 2008, 12:36 AM   #1
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Default couple of noob questions.

2 quick questions.
I got a good deal on some 15000 uf caps and was wondering if I had to change the snubber values for carlos's design if I were to use these larger caps (seems everyone is using 10000)
and I was wondering if I could use the following circuit from elliott's site for a buffer (with R3 and R4 removed for 0 gain) I got a couple of opa2134's laying around and not much in the way of discrete stuff for a buffer.
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Old 23rd April 2008, 09:53 AM   #2
Nuuk is offline Nuuk  United Kingdom
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I'll leave the snubber question to a snubber fan, but I guess the 15K's would be fine.

As regards the buffer circuit, if you want a gain of 0, just leave the whole circuit out and don't connect anything in its place!

What you mean is that you want no gain, ie a gain of 1, and that is what that circuit will give you, as will the buffer circuits shown here .
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Old 23rd April 2008, 10:08 AM   #3
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Default Re: couple of noob questions.

Quote:
Originally posted by coldfuzion76
2 quick questions.
I got a good deal on some 15000 uf caps and was wondering if I had to change the snubber values for carlos's design
I must point out that if you want to eliminate the resonance caused by connecting caps in parallel you must know the caps you plan to use and also the physical placement. Carlos' idea has no scientific value. If you want a predictable effect of these "snubbers" you must have a determined design, both in parts and circuit, pcb etc. The golden rule is at least to keep it compact. Carlos has chosen to have it far apart from the "consumer".

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Old 23rd April 2008, 10:22 AM   #4
AndrewT is offline AndrewT  Scotland
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Hi,
what is R5L feeding?
This is a very high output impedance for feeding most circuits.

The circuit has a gain of 2times (+6db).

Add an RF filter after the 1k0 input resistor.

And take that ground connection back to the input connector. It is part of the flow and return circuit for the input signal.
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