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Digital Capacitor
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 Audiofonics ADF-2.2 /2 Farad Digital Power Capacitor  US $34.99
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ESR Meter - The Capabilities To Check Beyond Electrolytic Capacitor
There is something good about esr meter because besides electrolytic capacitor it can be use to measure other type of capacitors such as the non polarity capacitor. From esr meter specification, it is usually mentioned only checking the electrolytic type. When i began to experiment with the Dick Smith ESR Meter i found that it have the capabilities to check other type of capacitors as well.
However it is limited to checking capacitor in the higher value only such as .1uf(104), .22uf(224), 1uf(105) and etc. Lower capacitance value don't get any reading from the esr meter due to it can only read until 99 ohms. Perhaps other esr meter such as the B & K esr meter have the range to check it.
You will even be surprised to see that the dick smith esr meter can check the non-polarity capacitor in-circuit (without removing the cap).
True case example-Monitor came in with display jumping horizontally. You can see a bunch of horizontal black lines across the top display (picture). From experienced it will tell you that vertical section have problem. I begin to troubleshoot the vertical section. Supply voltage checked ok, vertical driver and oscillator IC replaced, all components connected or nearby vertical driver and oscillator ic have been checked ok. By the way I used digital capacitance meter to check the non-polarity cap and esr meter to check the electrolytic cap. The problem is still there and can't be solve!
When i use Dick Smith ESR Meter to compare the esr value of a non-polarity capacitor located near the vertical driver ic, i noticed that there is a big different in the esr value. The good esr value for a .22uf non-polarity cap is between 6.5 to 7 ohm but the spoilt one have a value of 14 ohm! Almost double the value, that's why the display jump. The good thing is i discovered the culprit while the capacitor still in the circuit which mean this esr meter can check non-polarity cap in-circuit. However my recommendation for you is to solder out one leg and check unless you already have the experienced in checking components on board. Replacing the cap solved the display problem.
Conclusion-In order to accurately test a non-polarity capacitor, besides checking the capacitance value and using analog meter to check the charge and discharge to see if it has develop any short circuit when under load, you are also required to check the esr value as well.
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does any one know how to use a 1.5 FARAD 24 vcd max digital capacitor?
It has to be charged just before you supply power to it.
It's best to install it as close to the amp as possible. You may need to get addition power and ground wire the same size you have now. Otherwise, cut the ground and power wire leaving enough room to mount it. The overall length of the ground wire should as short as possible (18" or less if possible, not critical).
Remove the fuse at the battery. If you don't have one, you need one that is rated the same as the total fuses that are on the amp. It must be no more than 18" from the battery.
Connect the ground from the chassis to the cap then to the amp.
Connect the the power wire (from fuse by the battery) to the cap then to the amp.
To charge the cap, get a 12v light bulb with leads. Temporarily connect the power wire from the battery to one side of the bulb (at the fuse) and connect the other side of the bulb to the wire going to the cap. The bulb will light and over a period of time (10-20 seconds) it will get dimmer. When the bulb goes out, the cap is charged. Basically, your going to put the light bulb where the fuse was.
Now you can re-install the fuse.
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IMPORTANT: Make/print a sign/note that states:
"WARNING: This vehicle employs a large electrolytic capacitor for the electrical/audio system. The capacitor holds a charge EVEN when disconnected. When changing the battery, remove this fuse. Take caution and charge the capacitor prior to replacing this fuse. SEVERE INJURY OR DAMAGE MAY RESULT IN FAILURE TO COMPLY!"
Have a big red arrow pointing to the fuse and one of those yellow triangles with the exclamation point in the center. Laminate this sign and place it near the fuse by the battery.
Something like this:
http://i81.photobucket.com/albums/j230/sparky3489/CapWarning.jpg
How to use an FPGA to test a PLL band calibration algorithm
Prototyping an ASIC design first on an FPGA is not only useful for verification but allows more room for algorithm experimentation. Application-specific integrated circuit - Field-programmable gate array - Hardware - Programmable Logic - FPGA
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