Pumpkin preamp - ordered by Steen , official making thread

Dear Sirs engineers

As I slowly but surely approach the finishing of Pumpkin/shunty, I would like to take the opportunity by the horns and try to manage with serious measurements.
I am totaly newby in this matter.
Will you help me?

The conditions:
1.
I own an scope.
But no signal generator.
And square waves outputed by the PC sound card are not clean.

What should I do?


Trully yours

Manu
(Greedy to learn)
 
Manu said:
Dear Sirs engineers

As I slowly but surely approach the finishing of Pumpkin/shunty, I would like to take the opportunity by the horns and try to manage with serious measurements.
I am totaly newby in this matter.
Will you help me?

The conditions:
1.
I own an scope.
But no signal generator.
And square waves outputed by the PC sound card or not clean.

What should I do?


Trully yours

Manu
(Greedy to learn)

just set that drek by the book and enjoy ;

later - when you buy obladioblada outputin' thingie , you can measure and test everything ............... windows, doors , bleeekbleeek horns, Alephs, Pumpies ...... whatever you like

:clown:

edit:
scusi if answer from non-engineer doesn't suit you ......... :rofl:
 
Sorry to interrupt all the intelligent discussions - and adding noise to the nice signal all of you have been generating.

Doing some calculations:
So if corner freq, F = 1/(2 x pi x R x C)
(where R = R1 X R2 / R1+R2, and R1=shunt resistor of output and R2 = input impedance of F4)
And if I use 3.3uF for C4, C5.

R = 100k x 47k / (147k) = 31973

therefore F = 1.51Hz?
So give a factor of 10 where it starts to fall off the curve - so my calculations shows that it is good for 15Hz?

Correct?

her shann
 
hershann said:
Sorry to interrupt all the intelligent discussions - and adding noise to the nice signal all of you have been generating.

Doing some calculations:
So if corner freq, F = 1/(2 x pi x R x C)
(where R = R1 X R2 / R1+R2, and R1=shunt resistor of output and R2 = input impedance of F4)
And if I use 3.3uF for C4, C5.

R = 100k x 47k / (147k) = 31973

therefore F = 1.51Hz?
So give a factor of 10 where it starts to fall off the curve - so my calculations shows that it is good for 15Hz?

Correct?

her shann




just shoot for it , besides-you can always place nice little Wima as bypass for output caps ...... ya know these little red thingies ..... 2u2/63V

😉