change the resistance value in the caps? It's always defaulted to 2 and I always thought that this resistance must be changed to the ESR rating of the capacitor.
Thank you.
Thank you.
ESR
During a recent project I did change the ESR value only due to the fact that I was using a Black Gate cap and the ESR was very low on the order of .1 ohm or lower.
Jf
During a recent project I did change the ESR value only due to the fact that I was using a Black Gate cap and the ESR was very low on the order of .1 ohm or lower.
Jf
Nip along to Dick Smith's and buy the capacitor ESR meter kit. I received mine two weeks ago. It took me three hours to build and worked first time. I got it specifically for PSUD2...
Brian Beck said:
It's an australian electronics shop (which has ventured to selling pcs and other audio/video goods in the last few years).
not sure if they ship overseas though
www.dse.com.au
Hello Brian,
truth be told, I didn't actually "nip along" myself, but a friend in Oz got one for himself, mentioned it to me and I asked him to get me one in return for sending him some British goodies. I gather that Dick Smith have sold quite a few (12,000) of these ESR meters, and some abroad.
truth be told, I didn't actually "nip along" myself, but a friend in Oz got one for himself, mentioned it to me and I asked him to get me one in return for sending him some British goodies. I gather that Dick Smith have sold quite a few (12,000) of these ESR meters, and some abroad.
If you experiment, and change the cap resistance value from .001 ohms to even 2 or 5, it really doesn't seem to change too much in terms of the voltage curve, so i don't sweat it 😉. the thing i've learned to always measure is a) unloaded voltage on secondaries and b) winding resistance. those have SO much more of an effect.
Capacitor ESR doesn't change the voltages very much but it has a major effect on ripple currents, especially in capacitor input filters. It's very important to check ripple currents to make sure you're not exceeding choke or capacitor current ratings.
I ran the same simulation twice, once with the esr at 2R, and once at 0.1. Voltage was within 0.15V and ripple was essentially the same. Is there a real reason to spend $130 for this?
well, as long as you're within reason with your capacitances, it seems like you don't have to worry about ripple currents. you DO mean the big wavy things before the voltages smooth out, right? i didn't realize that it resistance would have such an effect. couldn't you "tune" your capacitor by paralleling a resistor? or is that folly of the worst kind?
Hi Brian,
If you have an LCR bridge or meter, you should be able to get a resistance from that. More use from one instrument.
You can also look up a manufacturer's spec. from the catalog. I'm sure most of these parts will range close to the same number per capacitance value. I am assuming you will be using new parts for a design. If not you may want to check your parts more closely than the ESR meter affords.
Specs are freeeeeeeee! 😎
-Chris
If you have an LCR bridge or meter, you should be able to get a resistance from that. More use from one instrument.
You can also look up a manufacturer's spec. from the catalog. I'm sure most of these parts will range close to the same number per capacitance value. I am assuming you will be using new parts for a design. If not you may want to check your parts more closely than the ESR meter affords.
Specs are freeeeeeeee! 😎
-Chris
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