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I have four, 5A, 280V solid state relays. They are activated by 3-8V. I need to tie them together so that I end up with a total of 20A. Do I tie them in series, or parallel? Also, do I tie the inputs in series or parallel so that there is one input? Thanks.

I'm using an rfid-rc522 and I want to print to the serial a string of text if two rfid tags have been read in a given time period. Essentially this: 1. First tag is read (print to serial: Tag 1 has been read) 2. Wait 2 seconds 3. Second tag is read (print to serial: Tag 2 has been read) 4. Print to serial: Tag 1 and Tag 2 has been read) 5. Bonus: Keep this state - and then when a button is pressed (print to serial: Tag 1 and Tag 2 are finished) I know how to read the UID and print to the serial if one is read. Thank you so much for your help, it's greatly appreciated. Here is my code so far: #include     // Core graphics library #include // Hardware-specific library #include #include // For the breakout, you can use any 2 or 3 pins // These pins will also work for the 1.8" TFT shield #define sclk 4  // SainSmart: SCL #define mosi 5  // SainSmart: SDA #define cs   6  // SainSmart: CS #define dc   7  // SainSmart: RS/DC #define rst  8  // SainSmart: RES Adafruit_ST7735 tft = Adafruit_ST7735(cs, dc, mosi, sclk, rst); #define SS_PIN 10 #define RST_PIN 9 MFRC522 mfrc522(SS_PIN, RST_PIN); float p = 3.1415926; void setup(void) {   Serial.begin(9600);   SPI.begin();   Serial.print("Starting cornhole leaderboard...");   mfrc522.PCD_Init(); // Init MFRC522 card   Serial.println("Scan PICC to see UID and type...");   // Use this initializer if you're using a 1.8" TFT   tft.initR(INITR_BLACKTAB);   // initialize a ST7735S chip, black tab   // Use this initializer (uncomment) if you're using a 1.44" TFT   //tft.initR(INITR_144GREENTAB);   // initialize a ST7735S chip, black tab   Serial.println("Initialized");   uint16_t time = millis();   tft.fillScreen(ST7735_BLACK);   time = millis() - time;   Serial.println(time, DEC);   // large block of text   tft.fillScreen(ST7735_BLACK); } void loop() {   // Look for new cards     if ( ! mfrc522.PICC_IsNewCardPresent()) {         return;     }     // Select one of the cards     if ( ! mfrc522.PICC_ReadCardSerial()) {         return;     }     if (mfrc522.uid.uidByte[0] == 0xA4 &&        mfrc522.uid.uidByte[1] == 0xB8 &&        mfrc522.uid.uidByte[2] == 0xB8 &&        mfrc522.uid.uidByte[3] == 0x96) {           Serial.println("Nate has checked in to the game.");           tft.fillScreen(ST7735_BLUE);           tft.setTextSize(2);           tft.setCursor(0, 0);           tft.setTextColor(ST7735_YELLOW);           tft.print("Nate ");           tft.setTextColor(ST7735_WHITE);           tft.println("has checked in ");           tft.setTextSize(2);           tft.println("to the game.");           delay(2000);           tft.fillScreen(ST7735_BLACK);     }     if (mfrc522.uid.uidByte[0] == 0x03 &&        mfrc522.uid.uidByte[1] == 0xFD &&        mfrc522.uid.uidByte[2] == 0xBC &&        mfrc522.uid.uidByte[3] == 0x02) {           Serial.println("Ted has checked in to the game.");           tft.fillScreen(ST7735_RED);           tft.setTextSize(2);           tft.setCursor(0, 0);           tft.setTextColor(ST7735_CYAN);           tft.print("Ted ");           tft.setTextColor(ST7735_WHITE);           tft.println("has checked in ");           tft.setTextSize(2);           tft.println("to the game.");           delay(2000);           tft.fillScreen(ST7735_BLACK);     } } Thank you!

Do I need to apply voltage to pin 5 for it to switch on chip Vishay VO14642AABTR? http://www.alldatasheet.com/datasheet-pdf/pdf/443188/VISHAY/VO14642AABTR.html

What do you think of the Presidents of the United States of America (the band)? Does anyone else on Instructables like my favorite band? If you haven't heard of them search for lump, peaches, or kitty on youtube.Attached are some pics I made using GIMP 2- te ones with the laser and the long poofy hair.

This morning I awoke to find Our president strewn about the news in a rather comical way: He had nearly been assassinated by shoes (joke) and I took some video using the technique from my recent instructable and converted it into a gif if you are going to use this on anything please make sure I'm mentioned, it's just common courtesy XD

I've just come across probably our best-funded new member: the United States Navy.Really. I checked.So, aside from the fitness videos, what Instructables do we want to see from the USN?Here's my starter list:How to shoot down a satelliteHow to make a torpedoHow to operate a steam catapultWhat do you want to add to the list?

Hey guys, I can achieve a mental state through meditation called flow, which helps me get better physical and mental results for a period of time. Could someone help explain a little more about it to me?

Hey, does anyone have any idea as how to make this, besides vaccuform? if you do, please PLEASE post!

I want to know if it is a solid state relay. i got it in an old photocopier matsushita. on the component it is written  sf16drz-h1-4 input    DC4~7v OUTPUT  AC 210V 16A K975c MITSUBISHI Electric it has 4 leads out. 2 small and 2 big. I googled it but no success and if you know explain to me how this component works. it has  a large heatsink on the top

 i burnt wax by keeping it on a spoon on a flame.... after some time it caught fire. then when i turned th spoon upside down large flames were there as if flame shower. so is it a good fuel?  

In this SSTC circuit from Uzzors2K I am a bit confused were the 12V and ground actually connect to seeing that this is a AC circuit? Also seeing as the AC is immediately rectified (I think you can do it with a bridge rectifier) is it possible to power it off DC?

I want to know how to create a link that when clicked will turn a color and stay that color. For example, if you have a navigation bar on a website and each page had its own link, how could you make it so that if you were on the home page, the home page link would black and the rest of the links would be orange? If you were on the about page, the about page link would be black ans the rest of the links would be orange. 

What properties of an environment can be measured with solid state sensors? Specifically, I am thinking of a project requiring a suite of sensors-on-chips that can measure their immediate (dry) environment and pass the data to a control unit.So far, I know of temperature, magnetism, radiation, acceleration and light (a camera chip).Are there any other (reasonably priced) solid state sensors, and where could I find them (either new, or reclaimed from something else)Edited:OK, so I thought I could be vague about my questions and then surprise everybody with a working satellite.Turns out I'm not so clever as I thought.I'm trying to recreate Sputnik on a tiny budget. Something that could be made by Joe Public, without having to rely on grants or Lottery funding.Sputnik weighed nearly as much as I do, but all it did was measure temperature and pressure, then send beeps that changed if the temperature or pressure went outside a certain range. I know it has been outdone by students with CubeSats, but they still cost tens of thousands of dollars.I thought that it should be possible to recreate (and out-do) Sputnik's capabilities on a single board, a simple programmable control chip taking in the data from a set of sensor-chips encoding it somehow, then passing it to a transmitter to be beamed to Earth.I thought - still thinking micro-budget - that the whole thing could be cased in a short piece of sealed PVC tubing, since PVC is radio-transparent.In my head, in fact, the satellite looks like a relay baton, but shorter.Am I being stupidly optimistic?

Well, I am planning to build a solid state tesla coil. I've already build a spark gap one, but the amount of control over the output offered by sstcs looks more enticing. I have been looking at many different designs, but I think I want to go with a design based off of Richie Burnett's sstc. http://www.richieburnett.co.uk/sstc01.gif http://www.richieburnett.co.uk/sstc02.gif Those are the schematcs. The first problem I'm running into is that he is running off UK mains, which are double the voltage from the US mains. Will the output of the tesla coil still be good if I am switching ~120v through the primary as opposed to the ~240v in the drawing? Would this mosfet (https://www.onsemi.com/PowerSolutions/product.do?id=MTW32N20EG) work in the power stage, or should i get a higher voltage/lower current mosfet? I also need a substitute for the mosfet in the logic stage. Does it even need to be a mosfet? Could I replace it with a transistor? The regulation circuit also worries me. Doesn't a linear regulator need to be fed a voltage of at least 2 volts higher than the output in order to function correctly? I just realized how many questions I really had about it. Wow. EDIT: I uploaded the pics for the sstc. The first two are the ones that I linked to, the third is Steve Ward's mini sstc. I was deciding between which one to use, but chose Richie's because Steve's has so many ICs and seems to be over-complicated.

I was taking a survey to see what country/state people live in.

Vote JellyWoo for the president of the United States of America! this website lets you enter in your name and then it will create a video for you. See my video as an example.

The following is a hypothetical (for now...): What Is The Long-Term Viability of Solid-State Storage? So, what does that mean? Well, I am asking about the viability and chances of data or hardware corruption of solid state storage if left in a relatively clean environment for...say...100 years, would it last? More specifically, if it were a boot drive, would it still boot? I am sure some of you will have viable alternatives to solid-state for this purpose I have not considered, which is why I am asking publically. I am trying to ensure the safety of important data over long-term (100+ years) storage and usage. Are there any recommendations/issues or alternatives any of you can think of which would decrease the chances of data loss over such a time?

I have a PLL SSTC. I use IRFP460 Half-bridge. Can I use other MOSFET?. Or how to choose a MOSFET for SSTC

I have a problem using a neon light to indicate when an SSR has switched on. When the neon is connected across the SSR output it lights even though the SSR output is off. There is about 100v on the output, enough to light it. Is there any solution to this. Photo attached.

I need to make a sequential circuit which output will used for my combinational circuit input. I already made my combinational circuit which gives output in 7 segment display. I need to show EC1013 in & segment.The binary to show them is given below. 000=E 001=C 010=1 011=0 100=3 You can see I need to show EC1013 where 1 is repeated again..thats why I am unable to figure out the state  transition diagram for that... I tried to simply make the state transition table according to my output  and used K-map to minimize that and build that circuit..but it stucks in the 10 loop.. after showing EC10 it keeps on showing 10101010 forever.can some one help me with that

Can anybody please help me with a sstc schematic? I'm thinking of building a sstc for an exhibition in my school and so i might need to run it for quiet a long time(like for a day with 5min intervals), and so it shouldn't overheat and die. Though I've found some designs especially the steve ward's sstc schematic, the problem is I couldn't get the ucc37322 & ucc37321 gate driver ICs, a suitable and more available substitute would be fine(I live in India). And which mosfet should i use for this purpose, i would be running it at 220v straight from the mains(in a H-bridge confg). And is the following audio modulator going to work with this?

I have a DC controlling AC solid state relay connected to an arduino diode for control and a light  bulb to the 220 side. While there is no signal coming from the arduino the bulb is blinking insanely fast, when there is arduino signal, the light remains constantly on as intended. How can i make sure there is no load at all on the 220 end while the relay is inactive, so there is no light flickering? Relay specifications: Control: 3/32VDC Output: 48-480VAC 50/60Hz Thanks in advance!

 Is it possible to convert a solid state amp to a tube amp?

I have built an audio equlizer for my independent study at school. There are a total of four state variable filters. They are summed together using a summing op amp circuit. Everything is working fine, except for a buzz I have. I have not calculated what frequency it is at, but it sounds as though it is between 200 and 400 Hz.

OMG! there was an eartquake! did you guys who live in the places mentioned above feel it? i felt tiny tremors, i live in central new york.

By double state i meant for if you press  once job 1 will be done and if you press second time job2 will be done!

I won some sugru from a contest on another website and it has a best before or use by date on it. How strictly do i have to stick to this? Will it still be good after that? I ask because i have only used one small sachet and the date is next month. Does anybody know how it performs after the stated date? Thanks mdog93

All guitarists seem to prefer the sound of a tube amp over solid state. Amp manufacturers, after committing to the solid state format, hook, line, and heat sinker, must have been appalled when guitarists began to demand availability of the old school tube amps, and scrambled to replicate the distinctive tube sound by means of additional effects and eventually modelling features. But, the big boys doggedly refused to admit the error of their ways, which, as it turns out, was a good thing as new amp manufacturers began to spring up to fill the void. Finally after sitting around their boardrooms, no doubt sipping their Coke new recipes while watching their market shares dwindle, they decided to reissue some of their most popular tube amps...at six times the initial price of course. I can't afford a new tube amp. I can't afford a used tube amp. Ebay and craigslist are rife with inexpensive, (relatively), solid state amps. My question then is, could a solid state amp be retrofitted with a tube chassis and perhaps still utilize some of the solid state attributes and parts? My instinct tells me yes. However, my knowledge of electronics and theory being nil, I really haven't the foggiest idea of what might be involved with such an undertaking. To say that a schematic is Greek to me is a gross understatement. Therefore, I appeal to the genius of the Instructable contributers to comment, or even better, start a project build. (C'mon gmoon, you know you want to!) Thanks Sycan

On January 27th, 2015, students, staff, and faculty came together to discover how to use bananas as piano keys, graphite drawings as game controllers, and program in Scratch to use play dough as piano keys. This was part of the Library's new Discover by Doing workshops, and our first Instructables Build Night! It was also the first official event for the newly formed Creative Technologies Association student group. We had 20 curious and excited faculty, staff, and students come through that evening, and they all left with a smile...unless they lost at tetris. There were three stations, one to play tetris with a drawn game controller, one to play the "bianano", and a "free for all" table with a variety of supplies. Each table had a student facilitator and all the supplies needed to complete the project. It was inspiring to watch participants work over the course of the night, and to see them working together to solve problems. Including one student's discovery that if he licked his fingers, he achieved better conductivity with the bananas (don't ask). The Creative Technologies Association is currently working with faculty on writing Instructables for the piano that was created using Scratch, and the discovery and design of the "earthly" connection wristband. We can't wait to share them with you, and are looking forward to future build nights! 

I want to build a solid state tesla coil and hook a keyboard up to it. how can i do this?

Hi all, What is the function of the state pin on the HC-05 6-pin serial bluetooth module?

I bought a Crydom D2425 Solid State Relay 240 Vac 25 Amp relay and I've been able to use it in tandum with my arduino uno to turn on and off a desk lamp so far. I've been reading up on pulse width modulation and was wondering if it was possible to control the lamps light level (something more than just on and off) with it. All help is greatly appreciated.

I have a half-bridge circuit. It using IRFP460. But I want turn this driver to high power version. So I request some help! Can I use IGBT for half-bridge circuit?

Can someone please explain how a SSR works i understand the basics, the led and the photo-diode but im not 100% sure how to use one. im thinking i want to control a large 12v motor that draws a high current (~50A) using the guts of a RC car remote, but i want to maintain the analog signal( if that makes sense...) i dont want it to be on or off, i want to be able to power incrementally. i thought that a SSR would be the right thing for the job.

From what I understand, an SCR is like a diode that can either be turned on to act like an everyday diode, and it will only turn back off when the power is cut. With this understanding, will this circuit work? if not, can you explain? even if it doesn't work as a tesla coil, will it work as a fence charger (with a trigger transformer or ignition coil?)

There is new talks to make English the official language of United States. Although some states have made English their official language it is interesting to see that sometimes more than one language is recognized as official. I agree that English should be the official language of the nation. As a matter of fact is the de facto language of the land. The problem I see is people trying to push the law in areas where is not necessary. English could be used for government business but the use of any language while engaging in commercial, religious, or personal use should not be prohibited. Imagine someone eating at a restaurant and being told to leave the premises because his or her use of her native language offends other patrons. I see this last scenario the misguided and extreme interpretation that some people will try to give to this new legislation.

Http://physicsworld.com/cws/article/news/39802Single atoms have been spotted doing the quantum version of the random walk by physicists in Germany. This sighting of a "quantum walk" could help in the design of quantum search algorithms, or in the understanding of the transition from the quantum, microscopic world to the classical, macroscopic world.Update 15 July 2009: The actual paper appears in this week's Science (pay-per-view, unfortunately). Here's a nice diagram from the article, contrasting (left) the quantum superposition with (right) one of the classicial random walks. The histograms below show their actual measurements in the two situations.

one word, 6 letters. The 1st letter is M, and the last letter is   give the meaning and who discover the 4th state of m____r.

Is there a specific waveform (for example sine, square, sawtooth, ramp, etc) that the driver electronics (an oscillator i think?) in a solid state tesla coil in order to properly drive the coil?

A question below reminded me of this. My friend and neighbor plays a guitar and has been going on about how great his new Fender tube amp is and how much better it sounds than the solid state amp he previously used. Truthfully, I've listened to him play on both (he's no Chet Atkins for sure) and I can't discern much, if any difference. I've done a little research and heard words like, "warmer,"  "more vibrant" and "louder" used to describe the difference. With the exception of louder, most of these descriptions are not actually measurable. Is there a way to definitively say tubes are better, or is it just a subjective quality that depends upon the ear of the listener?

I have a dead home server. It used two hard-disks, one for everything but /home and one for /home. /home is fine, as it was intended to be. I'm about to rebuild it, but its occurred to me that virtually all of my data in there, apart from less than a gig is pretty well static - its the house email server, so there is a dynamic bit in there, but its tiny. What's the best way to do this ? I've Googled a bit, but not found much guidance, except folks selling solid state servers. The motherboard is a mini-ITX. What about using Mint as the basis of something ? Steve

I am building a project that transmits FM radio waves about a mile with frequencies capable of being picked up by a normal FM radio. I know that those little iTrip connectors for the iPod can legally generate FM signals capable of being picked up by a car's radio antenna, but a mile of transmission seems a bit excessive to me. Would such a device be illegal? Does anyone have any links where I can find such information? Thank you.

Hi guys. I have a 12v lead-acid battery and i want to make a circuit, which can show me state of charge of the battery with 5 (blue or white) leds. When the battery is in use, it should light up all 5 leds at 100%, 4 at 80%, 3 at 60%, 2 at 40% and 1 at 20%.Now when i want to charge the battery i would like them to light up in order, as it gets recharged. Lets say it has 0% capacity left and i plug in the charger, the first led should start flashing/blinking. When the battery has charged to over 20%, the first led should turn solid and the second led should start flashing, which indicates that the battery has recharged somewhere in between 20-40% battery life. This goes on until it has reached 100% and all leds should light up solid. When the battery is in use (no charger plugged in) the leds should flash like this, just turn off as explained in first.Furthermore i would like to add a switch, which can turn on/off the indicators (but not the battery and charger itself)To see what i mean, i saw that soundboks, has added this feature in their batteryboxes: https://www.youtube.com/watch?v=rlY8B2dHYD4 (watch 0:50)Is this something someone can help me with?

Whenever I try to publish my instructable it states ERROR 401: Not authorized to EH55ICZFCEIJ5M7? How do I fix this? This is my first instructable so help will be appreciated

What kind of molecule does fungus excrete or produce as a by products of feeding or in a hibernation state? I'm just doing a little experimentation at home LOL

Hi guys, I'm working on a small solid state Tesla coil (Slayer exciter) and every time I test it, the internet router stops working and peoples don't really appreciate it when it happens. The router is about 25-40 feet away but my brother's computer is in the same room about 10 feet away but is connected with an Ethernet cable that might act as an antenna? I know that all the touch lamps in the house goes crazy so I really need to find a way to stop the EM waves to interfere with the electronics in the house. I thought about putting the coil in a earth grounded metal cage but have no idea if it would work and if there is any other ways to do it. Any help?

I've been looking about for something like this, and have yet to find something that will work for my needs. I plan to break ground on a portable Raspberry Pi system, and will need a battery system for it. I've seen a few others around (both RPi portables and battery packs) but I would love to be able to make a battery pack that I can charge while the battery pack is being used, along with add some form of meter to know how much charge I have left. Any and all help is greatly appreciated!

What if i instead of using expensive materials and building cryogenic systems to store oxygen and hydrogen...    I use electrolysis to separate oxygen (Negative) and hydrogen (positive) from water and store it in a water bottle so that i have a portable system of hydrogen and oxygen so that i can use it a few minutes after its "extraction".