Not sure if the picture is visible - if not please ignore posting! These are the capacitors I want to replace but I don't know what type they are.
123319
I'm replacing the capacitors in a very old tape recorder (1957) and I'm ok with the electrolytics but there are 4 with values 0.001 (x2), 0.002 and 0.005 uF i.e. 1, 2 and 5 nF. Two are marked as 250v and two as 750v. Can anyone suggest what to replace them with please?
56378
While reading a datasheet for an IC I came across the pin voltages being presented as 3V3 or 1V8. What does this representation stand for?
55200
I’m looking to install a capacitor in a circuit which runs at 12V and &lt;10A, and I want it to discharge in about 3 seconds.   The discharge voltage isn’t too important, but it’s probably best if it is as high as possible (not higher than 12V if that is even possible) for those 3 seconds.  The discharge time can be longer but probably should have an absolute minimum of 1.5 seconds.   Sorry if this sounds like gibberish. If I'm not giving enough info, please let me know what else i need to provide. I’m not an electrical guy; just working on a project and have no clue what I'm doing.
76178
I have always believed that it was ok to replace a capacitor with a slightly higher voltage rated one. eg 16v with 25v.Going higher than this would risk the capacitance value being out at the working voltage. However I just read the following quote from this       Electrolytic capacitors are non-ferroelectric with a very low dielectric constant. Their capacitance is derived from a very high surface area and nanometer thick dielectric layers. Their capacitance is not a function of applied voltage.‐Design Solutions For DC Bias In Multilayer Ceramic Capacitors (August 2010 Electronic Engineering Times)   So does this rule not apply to aluminum electrolytics? Eg will I have no issues replacing an electrolytic 25v 100uf with a 50v 100uf assuming both are low esr, similar footprint and good quailty?
101875
Here is a schematic of a Basys-2 board's power regulator IC and filters. It is just an example but this is fairly similar to many designs I've seen.  Why are there so many capacitors added in parallel rather than just one big capacitor? Can someone give me pros and cons of adding many many capacitors in parallel rather than one big capacitor for each supply net?
100057
Wondering why you would choose to use smaller capacitors in parallel vs one bigger one.  Here's an example:      Is this a component size and track width choice?  Thanks!
41773
I would like to make an indicator to show that DC bus (700VDC) capacitors are charged (be careful!).  What is the best way to make a LED indicator, which will work for a long time from 40VDC to 1000VDC without additional power supply and with minimum power losses?
111313
I am looking for an explanation what that component does inside of that circuit.  It can be found on page 3 of the Datasheet of ADP5091:   It would help me out a lot. Thank you in advance!
55680
I am EE hobbyist and I often used recycled parts in my projects. I came across this connector to a Heat Sink Fan and would like to know the name of it.  Thanks for the help.
100084
I have seen here and there schematics with electrolytic capacitors put on AC. And this sounds weird to me.  Electrolytic capacitors have a polarity, right? If we invert the polarities on DC, bad things happen. As far as I understand, AC inverts polarity every now and then (commonly 50Hz). Why can we put such capacitors on AC without damaging them?  Example:    from demonstration here:
105329
I need your help with capacitors...   I'm restoring a 160A inverter welding machine, model Fimer X164. One of the capacitors has cracked and I need tochange that..   Information about the capacitor on the board (i.e. exploded):  PILKOR 10nF 300V-Y2 PCY2 130 MKP  I can't find an identical capacitor but find similar values.  I have  1- 10 n K 400 RIFA 404 FVN  2- RIFA 271 Y 522 250V MP  Can I use capacitor 1? Or what do you suggest as a replacement for this capacitor?
97109
Can anyone help me identify this component? It just says 0 or D on it (I think it's a zero). I tested it for conductivity with a multimeter - doesn't seem to have any (tried both polarities in case it's a diode). Tested for resistance: nothing (i.e. infinite resistance), although I'm not 100% sure I was touching the contact points correctly, so don't take this as an ultimate measurement. Thanks in advance!
96386
I am trying to include a DC jack on one of my PCBs. I am just setting up the footprints now, and I am not quite sure which pin is which. What do the symbols on the drawing mean?  I have included a snap of the schematic below, it has been taken directly from the .
110362
What is this element on the far right of schematic described as "270 OHM"? Is this some kind of inductor? What is its purpose in this device (this is a reference design of dc-dc power supply of sim900 taken from its datasheet) and what would be an exemplary part number?
120258
What is the black thing on the below circuit?   Is it used to hide the IC (or other components) that is used on the circuit?   What material is it?
56791
I'd like to measure (to a few percent precision) the capacitance of a 0.8-0.06pf variable capacitor (eventually to be read by a 120mhz 32-bit microcontroller, if that's any help). I realize that one cannot just measure an arbirarily small capacitor to any accuracy, so I'm not sure if this is practically feasible. I've looked into making a regular RC time circuit and polling to measure the discharge time, but even with the highest value resistor I can easily source (100M) the capacitor is discharged within 1 microseconds, which (I believe) is a stretch for me to sense with the microcontroller.  If this is practically possible, how could I do this?  EDIT:  The capacitor I'm giving values for is just two 1cm^2 parallel plates with a 1-13cm gap between them. I'm ultimately trying to get the distance between the plates from this capacitance. This is probably just a shot in the dark, but I thought I'd entertain the possibility and see what one could hypothetically do; any information on why this wouldn't work would be appreciated. Once known from calibration, any added parasitic capacitance (from traces, etc) can probably just be removed from the final value, correct?
99010
It seems that reading a ceramic capacitor value out of its written values is harder than decoding enigma machine.  I wonder if experienced users here does have a trick to quickly figure out these values. Some examples:  I know that 103M is 0.01µF but how does one figure this out? Another example 104Z/LK ...this one I cant get it at all. All I know is that Z is for assymetric capacitors with tolerence between 80% and -20% ... Am I right? If not would be nice to correct me and tell me where these Z ceramic capacitors are used mostly?