• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Electrolytic Capacitor

Status
Not open for further replies.

alec_t

Well-Known Member
Most Helpful Member

alok1982

Member
Thanks Alec for your reply!
Generally my worry about age effect. So, ESR of my capacitor will increase, with the fall in the capacitance.
 

Nigel Goodwin

Super Moderator
Most Helpful Member
To be more accurate, in the vast majority of cases ESR greatly increases, and capacitance 'may' fall slightly - usually the capacitance is still within tolerance yet the capacitor is totally useless. If you're trying to find faulty electrolytic capacitors then it's ESR you need to test.
 

unclejed613

Well-Known Member
Most Helpful Member
tantalum "dry" electrolytics often fail short circuit, but tantalums aren't used much except in military/aerospace equipment. i see the occasional leaky or shorted aluminum electrolytic, but the most common failure is high ESR. my experience has been 85% high ESR, 10% leaky, 3% open circuit, and 2% shorted. they're not exact figures, and that 2% should have "other failures" included. Sprague Atom capacitors with the red epoxy seal usually fail intermittent open circuit. if there's a black ring in the epoxy around the + lead, replace the cap, because the black ring is from an internal high resistance connection, and if it hasn't failed yet, it will soon.
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top