exchanges the other side with the same results ;-)
Thank you!
But what is the price I do have to pay loosing R2-10?
A less stable PSU?
more Ripple?
?
just finished my first Project with one of your 18V to 15V psu: A analouge X-over for my DIY speakers
Thank you!
But what is the price I do have to pay loosing R2-10?
A less stable PSU?
more Ripple?
?
just finished my first Project with one of your 18V to 15V psu: A analouge X-over for my DIY speakers
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Hi! I accidentally killed one of the caps, 100uF 50V (I put it the wrong way). So I took whatever I could find, a 220uf 50V and put it in place of c60 (on the output). Can that affect performance badly, make it oscillating or something? Is it better to use a smaller cap, I also found a 47uf laying around.
I can measure noise 4,7mV p-p on the negative output(where the wrong value cap is placed). Is that the cause?
I'm planning to exchange that cap for the correct value next time I order some components anyhow, but its good to know.
I can measure noise 4,7mV p-p on the negative output(where the wrong value cap is placed). Is that the cause?
I'm planning to exchange that cap for the correct value next time I order some components anyhow, but its good to know.
It will probably work with either value but if I had to pick one I would have taken 47 uF, How did you measure the noise? The result is 1000 times more than expected. Expected value is a few microvolts only.
I usead a cheap usb osilloscope to measure, so it may not be reliable. It has a function showing p-p voltage when measuring. However the positive voltage measured 0 uV p-p. So something must be wrong somewhere with the negative side.
I will try with another cap to start with.
Can a cap get damaged without being visually destroyed. I did manage to put two of them the wrong direction, one blew up (c42) almost instantly. The other I had at the c60 position, and it seemed to survive. So I removed the bad one(c42) and put the one that survived at c42. And choose a 220uF at c60 (just guessed that the value of c60 would be less critical). So maybe I should chenge both of them for new ones?
I will try with another cap to start with.
Can a cap get damaged without being visually destroyed. I did manage to put two of them the wrong direction, one blew up (c42) almost instantly. The other I had at the c60 position, and it seemed to survive. So I removed the bad one(c42) and put the one that survived at c42. And choose a 220uF at c60 (just guessed that the value of c60 would be less critical). So maybe I should chenge both of them for new ones?
In case your oscilloscope shows "nothing" on the positive and something on the negative it can be a sign of noise but check your measurement setup carefully. Something could be damaged or a bad soldering joint. If your oscilloscope can handle 1 or 10 mV/div then you may have a problem.
Yes you are right about checking the measuring setup. Flipping the probe connectors, gnd to negative and probe "nail" to gnd shows the same as when measureing the positive rail = 0uV. So there is definitly some problem with the oscilloscope. So I guess all is fine 🙂 sorry for bothering u with noob problems.
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