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Old 27th October 2004, 03:13 PM   #1
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Default decoupling caps question

Ok, Im swapping out the opamps in my dvd player to AD8620's. Im adding 47uF Elna decoupling caps from pin 8+ to ground, and pin 4- to ground. I was told to just "stack" them over the existing .01uF ceramic SMD caps. My question is the pole orientation of the elna's. Now the pin 8 is easy + to +, - to gnd. How do I orientate the cap from neg to gnd on pin 4? pos on cap to pin 4, neg to gnd, or vise versa? Thanks in advance!
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Old 28th October 2004, 03:37 AM   #2
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Default please??

It may be a stupid question, but can someone take a sec to answer me? Going from DC -11v on opamp to gnd through a electrolytic cap. Where does the pos+ on the cap go? To gnd or -11v?
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Old 28th October 2004, 12:43 PM   #3
Luke123 is offline Luke123  Canada
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The (-) marks on the capacitor always goes to the smallest voltage potential on the circuit. So, for the positive supply, your cap should have its negative marks on the ground when other cap terminal goes to (+V). Fot the negative supply, the other cap should have its negative mark to (v-) and the other positive terminal on the ground.

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Old 28th October 2004, 12:47 PM   #4
Bricolo is offline Bricolo  France
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Yes, - doesn't always go to ground
I learned it the hard way
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Old 28th October 2004, 03:48 PM   #5
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Default Thank You

Thank You very much!!!!
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Old 28th October 2004, 07:31 PM   #6
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Quote:
Originally posted by Bricolo
Yes, - doesn't always go to ground
I learned it the hard way
i too! found out the hard way but, i at least got to see what the insides of a capacitor looks like he he.
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Old 28th October 2004, 09:56 PM   #7
Bricolo is offline Bricolo  France
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Quote:
Originally posted by crippledchicken
i too! found out the hard way but, i at least got to see what the insides of a capacitor looks like he he.

mine thought it was a rocket, and flew through the room
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