Hi all
I am in the process of sourcing components to build an Aleph P1.7 Clone
One of the significant costs is the capacitors used in the output legs of the circuit, namely C10-13 and C14-16. each is noted as 10uF.
I am trying to use WIMA MKP4’s for each of these
The 3 caps in the output are paralleled to equate to 30uF
Unfortunately these are rather costly at approx $10 AUS each..
My question is this, what would happen if I used 1 off 10uF cap instead of 3 off to each +ve & -ve leg?
Would the LF roll off rise by a factor of 3? (quoted in spec’s as being down 3dB at 1Hz) to 3Hz??
Am i missing something?
Pardon my ignorance
Regards and thanks in advance
I am in the process of sourcing components to build an Aleph P1.7 Clone
One of the significant costs is the capacitors used in the output legs of the circuit, namely C10-13 and C14-16. each is noted as 10uF.
I am trying to use WIMA MKP4’s for each of these
The 3 caps in the output are paralleled to equate to 30uF
Unfortunately these are rather costly at approx $10 AUS each..
My question is this, what would happen if I used 1 off 10uF cap instead of 3 off to each +ve & -ve leg?
Would the LF roll off rise by a factor of 3? (quoted in spec’s as being down 3dB at 1Hz) to 3Hz??
Am i missing something?
Pardon my ignorance
Regards and thanks in advance
Nelson
Thanks for your very prompt reply!
Your response leaves little issue for discussion!- I'll just plough on forward!
BTW have you had any chance to mull over the following thread?
http://www.diyaudio.com/forums/showthread.php?postid=235994#post235994
This posting by Mark Finnis relates to an alternative way of achieving a simplified volume control for the P1.7's that he and I will be building concurrently.
many thanks again, your kind efforts on this forum are effectively allowing me to achieve the equivalent in HiFi terms of the Sports car I can't afford to buy to battle my mid-life crisis.
"My regards to you and anyone else you might happen to bump into" Quote- Elwood P. Dowd.
Thanks for your very prompt reply!
Your response leaves little issue for discussion!- I'll just plough on forward!
BTW have you had any chance to mull over the following thread?
http://www.diyaudio.com/forums/showthread.php?postid=235994#post235994
This posting by Mark Finnis relates to an alternative way of achieving a simplified volume control for the P1.7's that he and I will be building concurrently.
many thanks again, your kind efforts on this forum are effectively allowing me to achieve the equivalent in HiFi terms of the Sports car I can't afford to buy to battle my mid-life crisis.
"My regards to you and anyone else you might happen to bump into" Quote- Elwood P. Dowd.
10uF will be more than enough - and so no need to parallel three of them?? Thanks!
1/(2PiRC)=cut off freq (-3dB)
1/(2Pi*10k*10E-6)=1.59Hz
10uF should be lots, unless you perhaps require deeper bass!
Gaucho said:
1/(2PiRC)=cut off freq (-3dB)
1/(2Pi*10k*10E-6)=1.59Hz
10uF should be lots, unless you perhaps require deeper bass!
Hehe - you now - it's never too deep
1.7 output capacitors
Hi all......
For the Aleph 1.7 output capacitor that is consisting of 3 x 10uF, not only for the purpose of lower frequency, but I guess more the 'sense of body' since the output volume control acts as a load to the pre-amp circuit.... The lowest the volume, the lower resistence, the more output is loaded.
You could test it with 30uF single caps and then parallel 3 x 10uF and feel this effect.... I have my own experiments and the experience told me so...
Just bear in mind, never use 'too big' output caps, since the sound just like when you use a graphic equalizer with V frequencies setting. Very un-natural and metallic on its high frequency...
I hope this will help you, and See you, guys....
Hi all......
For the Aleph 1.7 output capacitor that is consisting of 3 x 10uF, not only for the purpose of lower frequency, but I guess more the 'sense of body' since the output volume control acts as a load to the pre-amp circuit.... The lowest the volume, the lower resistence, the more output is loaded.
You could test it with 30uF single caps and then parallel 3 x 10uF and feel this effect.... I have my own experiments and the experience told me so...
Just bear in mind, never use 'too big' output caps, since the sound just like when you use a graphic equalizer with V frequencies setting. Very un-natural and metallic on its high frequency...
I hope this will help you, and See you, guys....
what about the volume control
The volume control shown for the P1.7 is also connected to ground. Not knowing the microcontroller details, I can't know the resistance for sure. However, it seems reasonable that the volume control could, for some volume levels, be as low as a 250 ohm load.
In that case the cutoff frequency (-3dB) is
1/(2Pi*250*30E-6) = 21 Hz
That is pretty high.
If you use a 5k or 10k pot instead, then you have no problem.
Jeremy
Gaucho said:
1/(2PiRC)=cut off freq (-3dB)
1/(2Pi*10k*10E-6)=1.59Hz
10uF should be lots, unless you perhaps require deeper bass!
The volume control shown for the P1.7 is also connected to ground. Not knowing the microcontroller details, I can't know the resistance for sure. However, it seems reasonable that the volume control could, for some volume levels, be as low as a 250 ohm load.
In that case the cutoff frequency (-3dB) is
1/(2Pi*250*30E-6) = 21 Hz
That is pretty high.
If you use a 5k or 10k pot instead, then you have no problem.
Jeremy
rsbay said:Hello,
is there any difference in the sonic character between the
Wima MKS4 and MKP10 capacitors ? Which is the better choice
for the Aleph P ?
Regards
Ralph
Hi,
I can try to organise the MKP4 10µ/160V for 2 EUR/pc + shipping. If you are interesting send me an email. MKS are polyester and MKP polypropylene insulated. I´ve not seen MKP10 with 10µ value...
At the next days I´ll loading up my layout for volume control (adc0804). -> http://www.diyaudio.com/forums/showthread.php?threadid=48428&goto=newpost
Regards
Adam
Aleph P1.7 Caps
Hallo ,
you can find MKP4 Caps by
http://www.buerklin.com/
10 uF, 250 V–/160 V~, 19,0 x 32,0 x 41,5 mm, RM 37,5
Ordernumber 43 D 5895 5,55 €
You can contact by walter_burkhardt@web.de
regards Walter
Hallo ,
you can find MKP4 Caps by
http://www.buerklin.com/
10 uF, 250 V–/160 V~, 19,0 x 32,0 x 41,5 mm, RM 37,5
Ordernumber 43 D 5895 5,55 €
You can contact by walter_burkhardt@web.de
regards Walter
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