Hi,
Does anyone know if there is a benefit to using off size capacitors to get a desired value for the purposes of a crossover?
Ex: Target is 80uF. Is it 'better' to use two 40uF versus a 20uF combined with a 60uF? Is there a simple rule, or calculation?
Thanks.
Does anyone know if there is a benefit to using off size capacitors to get a desired value for the purposes of a crossover?
Ex: Target is 80uF. Is it 'better' to use two 40uF versus a 20uF combined with a 60uF? Is there a simple rule, or calculation?
Thanks.
Ideally, you'd use the combo with lowest ESR:
Why low ESR matters in capacitor design – Passive Components Blog
Practically, I just use what I've got in my parts bin....
Why low ESR matters in capacitor design – Passive Components Blog
Practically, I just use what I've got in my parts bin....
I would expect no audible benefit, but when you connect two capacitors in parallel, you must use the lower of the two voltage ratings.
Thanks guys.
Galu, I'm not able to locally source the sizes required, so I was going to combine smaller values to achieve the desired uF.
I was just curious if one way of combining was 'better' than another.
Galu, I'm not able to locally source the sizes required, so I was going to combine smaller values to achieve the desired uF.
I was just curious if one way of combining was 'better' than another.
Understood, but use the minimum number of capacitors in parallel required to achieve the desired capacitance - less chance of bad connections that way!
Sounds good. Thank you!
Our of curiosity, is there a minimum recommendation or standard forVDC?
I was going to use 250V, because they are easier to find in audio grade 1%. That will give a fairly good Voltage buffer, as my amps rails are ~67V. Does that seem reasonable?
Our of curiosity, is there a minimum recommendation or standard forVDC?
I was going to use 250V, because they are easier to find in audio grade 1%. That will give a fairly good Voltage buffer, as my amps rails are ~67V. Does that seem reasonable?
250 V capacitors will leave a huge margin of error - perfectly reasonable.
A minimum recommendation for domestic speakers would be 70 V.
A minimum recommendation for domestic speakers would be 70 V.
If your amplifier rails are +/-67V, then the cap should be rated for the total voltage swing; ie- 134V; plus about half again (1.4x for safety margin), or about 200V. This is why a lot of speaker designs specify a minimum 150V on capacitors.
Wolf
Wolf