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DIYstompboxes.com  |  DIY Stompboxes  |  Building your own stompbox  |  should I have continuity across a capacitor? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: should I have continuity across a capacitor?  (Read 3765 times)
powerplayj
Posts: 517



should I have continuity across a capacitor?
« on: August 20, 2006, 12:01:59 PM »

I was troubleshooting my EA Tremolo for solder bridges and noticed there was continuity across a 22uf electrolytic (16V) cap.  Is there ever a case when this should happen?  The two legs are on different solder pads and the cap is in series between a FET and a resistor.  See C3 below.

http://www.generalguitargadgets.com/diagrams/eatrem2_lo.gif
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builds completed: boutique fuzz, rangemaster, BSIAB2, PT-80, Tonepad wah, Ross Comp, Axis Fuzz, MOSFET boost, Thunderchief, Big Muff (triangle), Mr. EQ, Dr. Boogey,  Neovibe, Dist+, EA Tremelo, ADA Flanger, RM Octavia
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DuncanM
Posts: 125


Re: should I have continuity across a capacitor?
« Reply #1 on: August 20, 2006, 12:19:33 PM »

Difficult to tell "in circuit" - the capacitor should start out looking short circuit and then as it charges (from the meter) the resistance would rise until it appears "open circuit".
However, in this instance the charge could leak away through the 1.2k resistor in series with the D-S resistance of the FET.
So continuity might be indicated.

If in doubt, I'd pull the cap and test it out of the circuit.
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Peter Snowberg
Global Moderator
Posts: 4898


Re: should I have continuity across a capacitor?
« Reply #2 on: August 20, 2006, 12:52:28 PM »

If the transistor conducts anything, you'll see a reading on the meter beause there will be an aternate path for the power used in checking to flow.

Just about any electrolytic will look like a short when it has no power stored in it. As the voltage in the cap rises, the continuity reading on the meter will get weaker and eventually the meter may stop showing continuity.

Caps are just hard to test in-circuit.
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