# Search for Capacitance in Topics

### what if i replace 200v with 220uf capacitor with 200v with 270uf?

Question by desarmy2002    |  last reply

Can a multimeter with a capacitance meter measure capacitance of a home made high voltage capacitor?

### Calculate capacitance across full wave bridge rectifier? Answered

OK,so I need an AC to DC converter.I used a 9 Volts transformer to convert 220VAC to 9VAC,then rectified it to 9VDC using a full wave bridge rectifier(IN4007).I need to know the value of capacitance which is to be connected to the 9 volt DC output(I heard somewhere that its got by multiplying the forward current*5 then dividing it by input voltage to the rectifier and the result is obtained in Farads........well I'm not sure if this is right and I need clarification).I've currently used a 1000uf capacitor and my multimeter shows the dc output from the bridge as 14 volts which is really confusing because before I used the capacitor it showed 9 volts.I really need a way to deal with capacitance.Pls do help me. I've added some pics(not much of help but.....)

### I am thinking of making a precision stylus for my LG marquee phone and my Acer Iconia tablet.

My fingers are too big to easily type on the virtual keyboard. I like the fingertip style, but I want something that is functional, not kitchee like a pen wrapped in tin foil. will the copper foil used in art glass projects work? Is there a conductive paint? How small can the tip be? I do not have a drawer full of arcane electronic parts.  I will have to buy new materials in mass-market stores. (I recently moved, no drawer of nubbies or left overs.)

Question by hardlec    |  last reply

### How to measure capacitance?

What is the most inexpensive way that I can measure capacitance? I have some photoflash capacitors that aren't marked with their capacitance. I went to radio shack, and the cheapest multimeter that measured it was around 60 dollars. Is there a cheap way that I can find out the rating of my capacitors?

Question by daa5849    |  last reply

Can a digital capacitance meter measure the capacitance of an inductor?

### How to measure capacitance?

How do I measure the capacitance of something, I looked at the local ACE and none of the meters have a farad reading or anything else similar to capacitance.  We have an analog one, and I was wondering if there is a way to use it I just don't know of.

Question by jj.inc    |  last reply

### capacitive touch not responsive

I have a cheapo 7 inch android tablet and the capacitive touch screen doesnt work well, some spost work fine but others dont what should i do? also is there anyway of connecting an arduino up with a usb adapter so a program can control it?

Question by The nerdling    |  last reply

### Emco Capacitance Meter (o-o-o-ld)

I have an older capacitance meter made by Emco. Just checked it today. It appears to work ok when I attached the alligator clips to a 2000mF capacitor it made some numbers come up.(I don't know how to read one).It's old, like from the 70s. Takes a 9v battery.Pics tomorrow if anyone is interested.

Topic by Rainbowlaces    |  last reply

### How do I determined the capacitance that is needed in a circuit? Answered

How do I determine what capacitors do I need in a circuit. For example, to make a LED blink. Thank you for your help.

Question by blkhawk    |  last reply

### Can I substitute capacitance on replacement capacitors?

I am trying to fix an IBM LCD monitor and even though I took electronics in high school and have replaces caps before I am not up on electronics enough to make design decisions. So, I would like to know or double check what an electronic supply store person told me which is that a 820uf 25v capacitor is replaceable with a 1000uf 25v capacitor. If the circuit being used on has an impact, these 3 caps sit on what  appears to be on or directly related to the power supply circuit as it is on the board that the power connector and transformer sits on.

Question by Richman1    |  last reply

### Junk-box Testing Equipment

As inductance and capacitance testing is a frequent topic on instructables, N5ESE's GIZMOs page has several home-brew testing gadgets and misc. gizmos, including:-- inductance meter-- capacitance meter-- frequency generator-- crystal checker-- dummy loads and attenuators-- 'scope probesCool stuff...

Topic by gmoon    |  last reply

### Capacitive Sensor Array Switch

I'm looking to build a on/off switch using an array of capacitive sensors.  To turn the switch on requires a finger swipe in one direction, and off in the opposite.  I will be using an Arduino with capsense as the controller.   How can I detect which direction a finger is moving across the array?  I understand what needs to happen and would research it myself if i knew the terminology behind it.

Question by buckchuck27    |  last reply

### What capacitance is a TO412 capacitor?

It came from a disposable camera and has no informational markings. The camera's a few years old so I can't get any manufacture's info. The "o" could be a zero for all I know, and it also says "PET" below that.

Question by Betelgeus3    |  last reply

### Variable capacitor and discharge question?

I don't have a variable capacitor of my own to test this so I am relying on the instructable community. What if you have a variable capacitor tuned so that it is at its maximum capacitance and then charge it in a circuit for 5 tau (essentially full charge). Then you completely removed it from any circuit so that you only had a variable capacitor with two (short) leads not connected to anything. Lastly, you turned the tuning knob so that the capacitor had less capacitance all the way to essentially 0 farads. What happens to the stored energy?

Question by seanroberts    |  last reply

Hello, out there, I would like to find how to build a ground penetrating gadget. I think there are a lot of 'us' would like to have something that can 'peek' underneath the surface of the ground, not necessary very deep. For example, such a gadget that can help fossil hunting tremandously. And it does NOT have to go all the way to Ground Penetrating Radar. As long as it can detect the differences between the matrix and interested object up to say 50 cm in depth, it will be good enough. And it doesn't matter what physical principle is used: GPR, ultrasound, electrical resistance or capacitance, ... (whatever). What I have in mind in such gadget would be tied to one of the shoes (so, it must be very light weight), using wifi to transmit the signal to iPad/iPhone so that the user can just walk and know the place to dig. Any help or comment will be greatly appreciated.

Topic by DinoDragon    |  last reply

### Capacitance transforms electrical energy into what other form? Answered

I've been working on my understanding of electricity. So I am a little ignorant on the subject. From what I've read, there are 3 fundamental ways energy is consumed in a circuit: resistance (R), capacitance (C), and inductance (L). But that's just the terminology, right? Energy is never consumed, it's transformed. So resistance primarily creates heat. Inductance primarily creates magnetism or a magnetic field. Capacitance??? Capacitance transforms electrical energy into what other form of energy?

Question by Vorenus    |  last reply

### Bluetooth amplifier with capacitive touch switch

I have a question and I think this community can solve it. It’s about a Bluetooth amplifier (tda7492p). I want to add capacitive touch switches(ttp223) to it. I saw one guy doing it on YouTube (https://youtu.be/dXUp-1cJUNQ) but I have no idea how I can do it because he didn’t add a wiring diagram to his video. Please give some advise. Thanks in advance!!

Question by Tomv89

### need help with capacitance and slow discharge!

I need to make a slow dishcharge capacitor bank capable of discharging 12 volts at about half an amp over about 5 seconds. What sort of capacitor and resistors should i use? It will be powering a short length of nichrome.  thanks :)

Question by kretzlord    |  last reply

### Will this capacitive discharge welder design work?

I am planning to build a capacitve discharge welder so that I can tab weld my battery packs, and I have no intention of paying 2K plus.  I recently came across a fairly simple design, and was using it to design my own.  If anyone that has built one of these, or knows how to, can look at this design in detail, and inform me if I have the right componants, and in the right order, it would be greatly appreciated  *** Please, I know the dangers and risks to what I plan on building so please do not express your concerns here.  Everything has risks, but without risks their can be no reward.*** UPDATE I added a new diagrahm with the opto-iso and relay that you two recommended, not sure if its right yet, but its a work in progress

Question by supramp    |  last reply

### Arduino capacitive touch sensor help

So I have been messing around with the Arduino Capsense library with the immensely helpful guide; https://www.instructables.com/id/How-To-Use-Touch-Sensors-With-Arduino/  (many thanks to DangerousTim!)   using the code provided, i managed to get a relay to operate with a sensor.  It worked great and I was able to adjust the distance and sensitivity.  But when i tried adding another sensor and relay, it stopped working.  I've been trying to isolate the problem for a while now and have gotten nowhere.  I'm hoping someone can help me, here's the original code for the single sensor and relay; #include #include                                           //change '42' to any desired pin... long time = 0; int state = HIGH; boolean yes; boolean previous = false; int debounce = 200; CapacitiveSensor   cs_4_2 = CapacitiveSensor(4,2);  // To add more sensors... //CapacitiveSensor   cs_4_6 = CapacitiveSensor(4,6);        // 10M resistor between pins 4 & 6, pin 6 is sensor pin, add a wire and or foil //CapacitiveSensor   cs_4_8 = CapacitiveSensor(4,8);        // 10M resistor between pins 4 & 8, pin 8 is sensor pin, add a wire and or foil void setup()                    {    cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);    pinMode(13, OUTPUT);   } void loop()                    {     long total1 =  cs_4_2.capacitiveSensor(30);            if (total1 > 60){yes = true;}     else {yes = false;}            // to toggle the state of state         if(yes == true && previous  == false && millis() - time>debounce){              if(state == LOW){          state = HIGH; }     else state = LOW;     time = millis();     }                     digitalWrite(13, state);            previous = yes;                 delay(10); } and here's the code for the two sensors and relays #include int led = 13;     int led2 = 12;    long time = 0; int state = HIGH; long time2 = 0; int state2 = HIGH; boolean yes; boolean previous = false; boolean yes2; boolean previous2 = false; int debounce = 200; CapacitiveSensor   cs_4_2 = CapacitiveSensor(4,2);        // 10M resistor between pins 4 & 2, pin 2 is sensor pin, add a wire and or foil if desired CapacitiveSensor   cs_5_7 = CapacitiveSensor(4,6);        void setup()                    {    cs_4_2.set_CS_AutocaL_Millis(0xFFFFFFFF);    cs_5_7.set_CS_AutocaL_Millis(0xFFFFFFFF);  //Calibrate the sensor...    pinMode(led, OUTPUT);    pinMode(led2, OUTPUT); } void loop()                    {     int total1 =  cs_4_2.capacitiveSensor(30);     Serial.println(total1);     int total2 =  cs_5_7.capacitiveSensor(30);                     if (total1 > 60){yes = true;}     else {yes = false;}    if (total2 > 60){yes2 = true;}     else {yes2 = false;}           // to toggle the state of state     if(yes == true && previous  == false && millis() - time>debounce){                    if(state == LOW){          state = HIGH;        }        else          state = LOW;          time = millis();      }                          if(yes2 == true && previous2  == false && millis() - time2>debounce){                   if(state2 == LOW){          state2 = HIGH;        }        else          state2 = LOW;            time2 = millis();            }                 digitalWrite(led, state);       previous = yes;       digitalWrite(led2, state2);       previous2 = yes2;                  delay(10); } Any suggestions are always helpful.

Topic by dudes    |  last reply

### Which Capacitance Meter Should I Buy?

I'm interested in testing some electrolytic capacitors I have, as well as some unmarked ceramic disc capacitors.  Which one of these would work best for me? Would this hvac one work? http://www.amazon.com/Elenco-CM1555-Digital-Capacitance-Meter/dp/B0002HDTDQ/ref=sr_1_1?ie=UTF8&qid;=1365901716&sr;=8-1&keywords;=capacitance+meter http://www.amazon.com/Capacitor-Capacitance-Meter-Tester-20mf--200pf/dp/B007MHBCFG/ref=sr_1_3?ie=UTF8&qid;=1365901716&sr;=8-3&keywords;=capacitance+meter Thanks!

Question by transistorguy    |  last reply

### If I put a capaciter that is the same UF and higher voltage will this affect my curcuit? Answered

Question by jbaker22    |  last reply

### Best way to accurately measure capacitance w/ osciloscope?

I am sure there are many ways to measure capacitance w/ an oscilloscope, and one of the annoying things is that some capacitors have different capacitance at different voltages and test frequencies. My original idea was to use the RC time constant and a known resistor, but I think this is probably the least accurate way to do this. Would using a sine wave function generator and figuring out capacitive reactance (and capacitance) be the better method? OR what about measuring resonant frequency of a LC tank circuit? Or some other method I have not mentioned? What's the best?

Question by -max-    |  last reply

### Capacitive touchscreen - easy to hack via Arduino?

I have successfully hacked a 4-wire resistive touchscreen overlay, via Arduino, but the touch data is very noisy (mechanical not electronic noise). I'm considering a capacitive screen as a solution: are such screens hackable, using just an Arduino and basic circuit-building skills? Brendan

Question by brendanmccloskey    |  last reply

### Cleaning House....by house I mean machine shop

Ok...finally compiled a list of everything that's going so I don't have to make multiple posts... this is it:Water Heater 10 gal. Electric 22x24" \$100CRT Monitors Qty. 4 FreeToledo Scale Vintage Counting Scale \$100Electrical Boxes Various sizes, shapes \$10eaDayton Right Angle Motors (Davit motors) qty2 (L&R;) 1/35hp from a boat model 5K5355 RPM 1725 \$300 for both or \$200eaExtrusion Various sizes, shapes, qty. \$1/lbCable winch from boat trailer \$20Time Clocks Mechanical, broken \$20 for bothBrewmatic Junior Industrial Coffee Pot \$60Baseboard Heater \$15Matsuura tool holders *NEW* (qty2) setting/changing fixtures fits BT40 \$470 for both or \$275ea2 Spring Testers 1 torsion \$Price unknown at this time1BridgePort DRO +Scales Scales OK, DRO broken \$100Mitutoyo Touch Signal Probe 192-001 \$115Micrometers Mitutoyo 8-9" part# 103-223 \$125 & 10-11" part# 103-225 \$135 or \$200 for bothGarnet Hopper Jet Edge new this runs \$8700! \$800Spring Wire Various sizes, stainless (17-7, 302) and music wire \$1/lb - large coils (pm/email for list)Drill Sharpener Darex M4 w/ accessories \$500Drill Sharpener SRD 80-M \$400Garmin GPS Old, still works! \$10Briggs & Stratton Motor NEW. 18hp cast iron, twin cyl. 964cc \$999Metal Desk 60" wide, seafoam green metal \$60Hose Clamps 5.25" in diameter \$.25/eaCoffing Hoist 1/2 Ton 3 phase hoist. Works, but is dirty. Has controls \$450Pepsi Machines 2 older can machines. They work & we have keys \$100Lip Cutter/Grinder Alexander 2CG (for engraving tools)w/accessories \$600Capacitance Meter Emco Capacitance Meter, old, good condition. \$20All prices are obo. It can be shipped UPS (sometimes USPS). I have pictures for most of the things on the list.Email garagesale@pittraffic.com if you are interested. I don't check PMs very often, but PMs ok too!THANKS!

Topic by Rainbowlaces    |  last reply

### Can i use different capacitance values of capacitors for a voltage multiplier?

Question says it all

Question by ARJOON    |  last reply

### When building a Coilgun, do i want higher capacitance or voltage? Answered

What is needed in the capacitor bank. For example could i use a group of 8,000uF 80v or would i need higher voltages up to around 400v?

Question by pyroten    |  last reply

### Square Capacitive Touch RGB LED Buttons

I'm having a hard time finding parts like these - is anyone aware of an RGB LED capacitive touch button?  Preferably with the light and the touch sensor separate (DPDT-type, perhaps?).  I'm looking to make a physical prototype of a mobile puzzle game I'm working on, and this would be an ideal input method. Thanks! -Jesse

Topic by xepherys    |  last reply

### brass capacitive touch screen stylus questions

Hello everybody i recently purchased a samsung galaxy 2 tablet and tried to make a brass stylus for it only to find it would not work any ideas why? thank you, fidgety2

Topic by fidgety2    |  last reply

### Want to find capacitive touch input for project

Hi there, I am working on a personal project and would like to find a capacitive touch input device which is roughly 5x30cm in size and will give me a x,y value for one or two fingers. The resolution does not need to be brilliant - 7 bit range in the x direction and maybe 5 bit in the y direction would be fine. Serial interface which I can use with my Arduino. I would also like to get a "pressure" for each - I know this is asking a lot but the "pressure" can roughly be guessed at not by actual pressure but by perhaps an increased/decreased capacitance or the amount of the surface being covered. I only need this to determine which of the two finger inputs is pressing hardest so again it doesn't need to be precise. Would anybody know of such a device? I mean - there must be companies producing these, I'd not want to go and have a custom one made for price considerations but surely there is something vaguely close. I have looked into the possibility of making one for myself but it appears I would struggle to do something this complex with my Arduino alone and the only IC which will do this with a homemade panel (not that I have the ability to create a capacitive panel with this many pads) seems to be QProx QT1081 which only accepts 8 inputs. Any pointers or ideas would be very gratefully received :) Cheers, Adam

### How to use a capacitive touch switch with an mp3 module

I have an mp3 / bluetooth module, which I currently use with a set of buttons extended out in parallel from the board ( https://www.instructables.com/id/Bolts-As-Bottons-...). I'd like to make another system using a similar mp3 module and a set of capacitive touch switches ( https://www.amazon.co.uk/SODIAL-TTP223-Capacitive-... )in the original, I just soldered a lead either side of the momentary switches on the board, however the capacitive switches have two power connections, (vcc and ground) and a single output connection so I cant connect them in the same way, how can I connect these switches to be the controls for the mp3 module please?

Question by oragamiunicorn

### Oscillator Trouble/Math ?

I have a "step-up" transformer from a DVD player that I really want to experiment with, but I know I need some form of alternating current to use it. I just finished taking a 3-week summer camp at which I learned about electronics, and there I encountered the 555 circuit. It's simple to build; I can just connect all the pieces on a small breadboard, considering I have several 555 chips. But what makes me a little miffed is that anything over 6V could burn out the chip's components. So I gave up on the 555 oscillator, and turned to the simple(-er) LC circuit. I want to have around 60 Hz to simulate the mains frequency, but I have no idea what capacitance or inductance I should use. Furthermore, I don't quite understand how to achieve a specific inductance based on coil turns, coil diameter, coil length, etc. If anybody could clear me up on these concepts, I'd greatly appreciate it.

Question by Umniscient

### Can somebody get the capacitance of c8p3 on an xbox 360? Answered

The capacitor is on the bottom of the mother board around the chip ncp5331 (the numbers and letters on the top of the chip). THANKS I appreciate you caring.

Question by jbaker22    |  last reply

### How much should the capacitors capacitance be for my race track, car project? Answered

Hi im doing a project for my brother for christmas. Its a Drag race track thing, I have it all planned. Buuuuuuut for the cars I am using a capacitor, and a motor rated for around 6volts. WHAT should the capacitor's capacitance be?  A high capacitance or a low one?  I have a charging spot on the track to charge the capacitor, and then the energy stored in the capacitor powers the motor for long enough time to make it to the end.(Which is only 3 feet). Note:I found a small car that does just that but the motor doesnt work and the capacitor doesnt show the capacitance on it and I used my multimeter but it said DisC. I will post a picture of it later if it even helps. :(

Question by Mudbud    |  last reply

### Where can I get a capacitive touchscreen overlay kit for my laptop?

My laptop is an Asus G72GX (very fast computer) that has a 17.3" screen with 16:9 aspect ratio. I would like to know where I can get capacitive (must be capacitive, resistive is old school and doesn't respond as well) touchscreen overlay kit. I've googled quite a a lot and though I've found some that fit my screen size, but they aren't capacitive. Since my computer runs both Windows 7 and Mac OS X Lion, it also needs to be compatible with Mac OS. -Thank you for you're help

Question by epicnoobpwn    |  last reply

### Is wax paper a good dielectric for a large capacitor? Answered

Question by JamesRPatrick    |  last reply

### How to rig a capacitive touch to a usb keyboard (or gamepad)?

I need to make a touch sensitive (capacitive) button that triggers a key. I got a capacitive demo board from qprox that should be fine...I touch it and I can hook it up to an LED that gets lit. But if I try to put the wires from a button on a gamepad to the out of the demo board, the button is constantly in the "Down" state. I think I remember reading somewhere about a polarity reverser or something so that it reverses the On and Off state, but not sure what I need. Also, the demo board is powered via a small watch battery which is perhaps conflicting with the power from the USB? I'm not quite sure the best way to do this. I think I can power the demo board using the USB power rather than the battery. I also would like some advice on creating the Capacitor to a 3" button surface are that goes through 1/4" glass. I've got a resistor that upped the Qs so that it works through glass, but not sure how to make it fit to a desired "button" shape.

Question by superjames    |  last reply

### Need help with capacitive button cover for Xbox One.

So I hate capacative buttons.  I work for Microsoft as a game dev and we all have Xbox Ones.  They have the worlds most sensitive capacative power button.  We regularly accidentally turn our boxes off with a slight brush of the hand, bumping a coffee cup that was too close or brushing a controller cord against it. I have been trying to build a button cover.  One that will still turn it on and off with an actual press rather than a light glance of the hand.  I have had no luck so far and have been learning about conductive surfaces along the way. The original plan was to use conductive rubber and some scotch double sided tape.  The tape I am using is a clear rubber and has a mm or so of thickness to it.  I bought some gasket punches and punched out a button about the size of the capacitive area of the Xbox One power button, around an inch, and then another in the tape.  I punched out a smaller center hole in the tape to turn it into a washer, and stuck it onto the button and stuck it on the Xbox.  In theory you have to press the button in to make contact with the capacative button to turn on or off the Xbox.  But alas, it still turned on with the slightest of brush still.  I stacked the tape up to four times.  I tried foam mounting tape.  Alternated tapes, stuck electrical tape inbetween, and still the same thing.   On their own the tapes wouldn't turn on the button when tapping them to, but perhaps there was enough distance when touching holding it length-wise rather than flat against. I figure the electricity must be flowing over the non conductive surface and still going to the button.  In the office with all the EMF I seem to be averaging around 3v to the touch.  I have a grounding mat at my desk that when I make contact with takes me under a volt, to around 0.3v but that doesn't make a difference. So I figured I needed a bigger insulator.   I got some larger machine washers where the hole seemed larger than the capacative area, punched another larger button out of the conductive rubber and glued it over the hole.  Using double sided scotch tape I stuck it to the Xbox.  The same thing as before happened.   Even touching the rubber only was enough to turn it on with a light bump.   I figured I needed a ground.  I tried removing the grounding cord from my mat and holding it against the rubber of the button.   It seems slightly less responsive but still turned on easily.   I tried running copper tape along the side of the Xbox to the button to see if that would draw away the charge, but it did not. Taking my rubber washers I used my multimeter to see if they were conductive at all.  They did not seem to be.  Setting it to measure the volts in ac they are picking up about 0.03v, but so is just the air.  But the rubber rings will turn on the Xbox when I hold them though the thick double sided tape will not. Does anybody have any ideas on how to get this to work or what I am doing wrong?  I will admit I don't know a ton about this stuff.  But I don't understand how these materials can turn the button on.

Topic by technicallyartistic    |  last reply

What is the average capacitance of a salt water beer bottle capacitor?

### Is there any way to change the capacitance on a leyden jar/ bottle capacitor? Answered

I am trying to build a capacitor bank for my tesla coil. I am running two 15 kv transformers in parallel for 120 mah. I was running a bank of 7 .015 mf capacitors with 4 wired in series on each one but they burn out incredibly fast. I need a way to build my own that will either withstand the heavy stress or are simple to replace. Either way they need to be the exact capacitance of my tesla coil.

Question by crazy coiler    |  last reply

### what smd components can I use to make a voltage regulator? Answered

I have components from a laptop hard drive and would like to know which components on the controller board can be used to make a voltage regulator that regulates voltages at 3,6,9 and 12 volts.

Question by techfix1    |  last reply

### If I have two identical capacitors and I connected them in series/parallel what would happen? Answered

Take 10,000uF and 100v, Does that double the voltage or the capacitance? I want to end up with a capacitor bank of around 400v with a capacitance of minimum 8,000uF. So what I'm getting at is what can i change around in terms of capacitors and to what effect. Thanks : DBTW, I'm going for a coilgun hereEDIT:Also, if i'm building a capacitor bank for a coilgun, would i be going for the max capacitance or the max voltage?

Question by pyroten    |  last reply

### Help needed to build a circuit board for a capacitive touch pad with LED's learning aid.

Hello, I am looking for abit of help.  I am creating a capacitive touch system with blue and Red LED'S that light up when touched.  This is for a friend who has a disabled child, and it is going to be a learning aid for them.   So I have 2m of blue LED's and 2m of red LED's attached to x8 AA batteries. I need to create x2 capacitive touch pads that are 20cm x 20cm and when the system is powered on the Blue LED's are lit up then when either of the pads are touched, it changes the LED's to Red LED's on, and blue off, so it basically switches between red and blue as you touch either of the capacitive pads?   I can create a custom PCB board using PCB WIZARD 3.5 but I dont know what has to go where? Or if you can just buy the PCB board that does this from sumwhere?? I have stripped down a TOUCH LAMP and see if has a pcb board in it, and it changes the light from off>>low>>medium>>high>>off (so it must be possible) Could you please let me know if there are boards I can buy that do this? Or do I have to get one custom built? Thanks for your time   Alex

Question by tenchfilms    |  last reply

### Does anyone know how to hook up a motor to a rectifier and then hook up the rectifier to a capacitator and LED?

Hi Does anyone know how to hook up a motor to a rectifier to convert AC to DC. Then the current needs to be passed to a capacitator, and finally discharged to an LED. I am doing this for my science fair. Thank you!

Question by ronney    |  last reply

### can I get the value of an inductor with a resistance and capacitance meter? I don't have an inductance meter.?

Question by m.m.m    |  last reply

### Can an instructable be edited after it has been posted? What if I forgot something?

Question by capacitated    |  last reply

### how to solve external crystal problem in pic16F and its capacitance

I have made a circuit of radio control switch with PIC16F and diplayed the value on LCD16X2, i am having the problem with its crystal frequency. When i set pic18F with its internal crystal of 4Mhz its working fine,but not with 16F using 4MHz  external crystal and 33pF capacitor so how should i solve the problem of external crystal and its capacitance for pic16F.

Question by Alia Bakhsh    |  last reply

### How to calculate a Tesla coil semi spherical top load capacitance? Answered

I want to know if you can calculate the capacitance a Tesla coil semi spherical top load by calculating what it would be then halving it? Also if that is possible could you third it or quarter it because I am going to buy metal bowls for it and most aren't quite a semi sphere (a lot only go about 120 degrees)?