2nd stage preamp and power supply

[preciousmolina666]

1) in my schematic im going to use 2 single chip, How to proper supply them using regulated 18v bipolar supply,  what value of electrolytic should i use? should i add 100ohm? how many amphere it need?

2) Is my 2nd stage ok? feeding 6v input and output  will be 15v

Schematic:
Update:


Old
http://i1006.photobucket.com/albums/af190/preciousmolina666re/stage_zpsxhkeltcv.jpg

[preciousmolina666]

Found this on internet

Proper supply decoupling (omitted for clarity) is necessary. Parallel
combination of large electrolytic cap 470uF with 22uF tantalum and several 100nF ceramic
in every supply with serial resistor 47-100 Ohm is recommended

[Brisance]

you have your negative supply the wrong way.

[antonis]

Found this on internet

Proper supply decoupling (omitted for clarity) is necessary. Parallel
combination of large electrolytic cap 470uF with 22uF tantalum and several 100nF ceramic
in every supply with serial resistor 47-100 Ohm is recommended

It's definately right...
(although I don't like tantalum caps.. )

I think that serial resistors in every supply connection is an overkill (but ensure IC's long healthy life..) - just place 100nF ceramics (disk) as close as possible to IC's Vcc and Vee (one leg to supply pin and other leg to GND)

I can't open your dropbox scheme so I can't tell you about your current need but ONE 47-100R resistor in series with individual supply voltage (one for Vcc and one for Vee) should be OK..

P.S 
By "18V bipolar" do you mean +18/0/-18 or +9/0/-9 ...

[preciousmolina666]

P.S 
By "18V bipolar" do you mean +18/0/-18 or +9/0/-9 ...

+18/0/-18
i hope the link is working now

[antonis]

It works but I can't see why Brisance noticed wrong negative supply...

Instead I can notice some mistakes at your "labels"...
(like C2+Rf Low Pass & C1+R1 Low Cut - probably due to anagram..)

On your scheme there are 3 different filters: C4/Rf LP, C3/P2+Rg HP & C6/R1 HP..

IMO, values of R1/C6 & P2+Rg/C3 must be recalculated...
(not for actual cut-off frequensies - that's a matter of taste...)

edit: You should "isolate" stages with a capacitor and place a 1k resistor on OP1 output..

[preciousmolina666]

On your scheme there are 3 different filters: C4/Rf LP, C3/P2+Rg HP & C6/R1 H

oh the pots involve in Highpass/lowcut, thanks

IMO, values of R1/C6 & P2+Rg/C3 must be recalculated...

i dont what u mean recalculate, my input source is 500r mic

[antonis]

I'm talking from economy (price & size) side...

You can pass from big electro to smaller (or even non polarized) caps, saving space and money...
(resistors keep their size and price despite of their value - as long as are rated at the same wattage..)

Generaly, you tend to use relatively low value resistors and this results in excessive current and signal loss - in contrast of course to thermal noise..

[preciousmolina666]

You should "isolate" stages with a capacitor and place a 1k resistor on OP1 output

my spice said my signal to noise was raise, i think im gonna put 10k, what this do? protection?

Generaly, you tend to use relatively low value resistors and this results in excessive current and signal loss in contrast of course to thermal noise

i thought using low value is to minimize noise and i want my signal to noise low, now im confuse

[antonis]

my spice said my signal to noise was raise, i think im gonna put 10k, what this do? protection?

Your spice doesn't care neither about DC "leakage" nor about OpAmp's Output current capability..

i thought using low value is to minimize noise and i want my signal to noise low, now im confuse

Gap between Theory and Practice is always confusing..

[antonis]

Don't get my  wrong...

I'm not the appropriate guy for an in-deph explanation - neither my language nor my electronics knowledge skills help me...

[preciousmolina666]

Your spice doesn't care neither about DC "leakage" nor about OpAmp's Output current capability

i see

Can someone edit schematic that run low noise