Led soldering help

I wanna solder 10 leds parallel and but it in light bulb like in https://www.instructables.com/id/A-Steampunk-lamp-with-muliti-color-LEDs/step2/Preparing-the-bulb/ I don't have aluminium tube. I have only heat shrinking tubes. I found serial scheme http://img.neons.org/archives/LED3rdBrake/image23.gif. I'm thinking to use battery - as ground. I have 100k and 10k resistor. 1m think this is resistor. I dont wanna mess things up or burn someting down.

Question by DeathSuperMario   |  last reply


How many LEDs can a 9 volt battery power in parallel?

Basically what the title says 

Question by Zem   |  last reply


It possible to connect multiple AXT PSU's in parallel or series to increase the current and/or voltage?

It possible to connect multiple AXT PSU's in parallel or series to increase the current and/or voltage? I'm not too sure what else to say... Thanks a bunch,Mike :)?

Question by muttyfutty   |  last reply


What happens when you connect capacitors in parallel and series?

Does it raise the voltage rating if connect in parallel? I am going to be usin the capacitors for a coil gun, so I want the maximum voltage without having to buy bigger caps. Thanks

Question by qwertyboy   |  last reply


HOW CAN I BUILD A CART TO PULL BEHIND MY POWERCHAIR?

I AM PARALIZED ON MY LEFT SIDE. I NEED A CART THAT WILL BE 48" WIDE X 80" LONG X 18" HIGH (WITH 10" PNEUMATIC WHEELS). I WANT TO HAVE 10" FIXED SIDE RAILS. THE HITCH POINT HAS TO BE 1" SQUARE WITHOUT A BALL. I NEED THE WHEEL AXLES TO BE ABLE TO TURN INDEPENDENTLY (FOR TURNING). I ALSO NEED A JACK STAND TO BE ATTACHED TO THE FRONT OF THE CART.

Question by CHRIS102009   |  last reply


Wiring Two Ports on a Phone Battery Bank in Parallel?

If a power bank claims that each port on it can charge a device at 2 amps, if I connect both ports together in parallel, am I able to get 4 amps? Or would it be just like trying to double the voltage off of the same battery, and not work? I have an Intel Compute Stick, which requires 3 amps to run. However, battery banks that provide more than 2.1 amps per port are super rare. Would it work to wire them in parallel?

Question by RocketPenguin   |  last reply


74LS147N 10:4 priority encoder not working... Answered

Hi,    This is a follow up of this question- https://www.instructables.com/answers/Logic-circuit-to-generate-and-convert-3-bits-paral/ I set all the 10 inputs of the encoder high and was expecting to see all the 4 outputs give a high(4 LEDs were connected to the outputs to see this happen).But that wasn't the case and just 2 of the LEDs glowed.I tried different configurations on the inputs but all the time it was either these two LEDs that glowed or none .Can this ic power 4 LEDs directly from its outputs? Could I have wrecked the ic? Something a bit off the topic- What should I keep in mind while mixing TTL and CMOS logic gates? I powered the ic with 5 volts.

Question by Adarsh_tronix   |  last reply


Can I charge 2 deep cycle batteries with my car alternator and a 200w solar pannel kit at the same time?

I have a conversion van with 2 deep cycle batteries in paralle hooked to my . I want to add a 200w solar power set up with a 30 amp solar charge controller to charge my batteries in conjunction with the alternator. I only drive 20 minutes a day and I live in my van. Can I hook up the solar set up with the alternator set up? I also have a 2,500 watt power inverter hooked to my 2 deep cycle batteries. If you have any information on a set up I can do please help, thank you.

Question by Creighton43   |  last reply


Can I send Parallel Port outputs/Record Parallel Port inputs with Batch files?

Is there any way that I can do this? If possible, can you please specify how I would accomplish this, and any other things you may know about Parallel Ports, Batch Files, Maximum Input Voltages On A Parallel Port, and the functions of the leads on the Parallel Port socket. If this isn't possible, I would be grateful if you were to point me in the right direction(Ex: other languages and programs that support output/input, info about coding, etc.). Thank You in advance!  I was planning on developing a simple blinking Led or Tone generator, and the only feasible way of doing this may be a Batch file (feasible because Batch files are the only things I can create on my own without trouble. :( ). I am also going to attempt to record the codes on a remote using an IR sensor so I can develop "An ultimate computer-based remote control".

Question by =PhysicsGuy=   |  last reply


Logic circuit to generate and convert 3 bits parallel binary code into series for subsequent transmission ? Answered

A project I am working on has 6 water sensors placed at different altitudes inside a tank.I've developed a circuit to assign 3 bit binary codes to each of the sensor and then transmit it wirelessly.I've attached the truth table and the binary functions that yield the desired output, as a picture.Please refer to it and check if it looks alright to you.Keep in mind that the sensors output '0' (ground) when idle and '1' (Positive) when active.  Also, the sensors are so placed that sensor 2 won't get activated unless sensor 1 is activated ,sensor 3 unless sensor 2 is activated and so on..I.e,when the sixth (last) sensor is activated ,all the other sensors would be active too.So,the truth table contains just the possible combinations. A,B,C,D,E and F are the sensors(bottom to top) X,Y and Z will be fed into a binary encoder ic,whose output will be transmitted. Surfing the web,I realised that logical high and low can also be set using pull up and pull down resistors .I would appreciate it if someone could enlighten me on how this is done.(Explaining with reference to my circuit will be the best way)

Question by Adarsh_tronix   |  last reply


How to calculate resistor size for lasers in parallel - for dummies

I have four laser modules taken from laser pointers. Normally each module runs off of three hearing aid batteries in series, 1.5 volts per battery 4.5 volts total. I want to run all four laser modules off of two D size batteries which are 1.5 volts each 3 volts total in series.The problem is they will not light up when connected to the two D size batteries in series ?  When I use a power supply they will light up even at only 1.5 volts  ( although dim ) up to 5.5 volts,after that they become permanently dim, with the brightest at 3 volts. It seems like I have to limit the amps not necessarily the volts. Each module has its own resistor  - the # on it is 680. When I measure the resistance it shows 68 ohms. What do I need to do to get this to work ? There must be some way to simply figure this out.... By the way I have about 40 more laser modules and I might like to use them all at once to make say..... an unquestionably visible turn signal bulb for my truck or maybe a very illuminating flood light for my backyard .... If I can figure this out the possibilities are endless !            

Question by I Need To Know   |  last reply


Is it a good idea to wire an ELECTRET mic in parallel? What are the advantages and disadvantages? Answered

I already made a prototype of a low-noise desktop microphone (with an internal 5 stage transistor preamp). It only had one ECM capsule inside. A few days later I found a couple of pictures of a certain microphone with two ECM capsules wired up in parallel. It made me wonder, will it increase the sensitivity of the mic while reducing noise or will do the exact opposite? Is is a bad idea to hook six of these in parallel? Sorry, I'm not an expert when it comes to microphones. Before I post a guide, I wanted to make sure of what I'm saying.  The Reason: If you are familiar with the Blue Snowball USB microphone, you'll be surprised on what's in it. I recently discovered that it has two "Electret Condenser Mic Capsules" soldered in parallel. I thought there was something special about the Snowball since the reviews went crazy (4 1/2 stars on amazon)! I was expecting a huge diaphragm, but no, it only had two tiny ECM mics soldered on a Preamp + USB DAC. Lesson learned! Never underestimate an ECM mic.  ______________________ The picture is my prototype, it's working great right now. Luckily, the 5 stage preamp is giving zero noise. I'm planning to add a USB D.A.C. and an ECM array on my final version.

Question by ASCAS   |  last reply