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zener diodes????????????? Answered

I know that Zener diodes will only let pass a given voltage.Say for example a 3 volt zener diode lets pass 3 volts or higher only(not below).But recently I came across an instructable where a zener diode lets pass voltage when it falls below a range.Back to the 3 volt diode,it allows voltage to flow through it only when its below 3 volts.But how??are they different types of diodes.Please give me a brief idea to clarify my doubts.Hope you get my question

Question by Adarsh_tronix    |  last reply

Zener diode. Answered

What is the voltage drop across a 3v, 0.5W Zener diode?

Question by Ahtasham Ahmad Mohtashim    |  last reply

Help with zener diodes? Answered

I'm trying to get a better grasp on how to use a zener diode. I have plenty of information about what they do (allow current to flow one way until the voltage is high enough, then reverse the flow), how they work and even how they are made, but finding basic information about how to use it is harder. I am trying to connect a Keyboard Encoder to an Arduino. The Encoder runs on 3.5v and the Arduino runs on 5v. When a pin on the Encoder is connected to ground it outputs a keystroke to the computer. I have an Arduino pin set to HIGH (5v) as normal and under some conditions it changes briefly to LOW (ground) which is when I want the Encoder to output to the PC, and then back to HIGH (5v) again. To protect the encoder from the higher voltage coming from the Arduino I think I need to use a zener diode. If my understanding is correct it should work as described in the diagram. When the Arduino pin is High (5v) the Encoder reads as 3.5v and any voltage over 3.5v is drained to ground rather than pushing against the Encoder. No keystroke is passed. When the Arduino pin is LOW (0v) the Encoder reads 0v, the zener diode adds resistance and voltage runs to the Arduino. The Encoder sends a keystroke to the PC. My main concern is that once the voltage is over the 3.5v all of the power will drain to ground rather than maintaining the 3.5v before the zenner diode. I can't find anywhere which will tell me either way. If you need more information on my set up please let me know. I'm really struggling to get my head around this! Thanks!

Question by RandomIdeaMan    |  last reply

Mosfets and zener diodes?

Backstory: I'm in the middle of modifying an ac welder to dc and plan on doing my first ibble using it as the topic.   Sorry for writing a book here,  I didn't want to be too vague and just confuse everyone.  I have most of the parts for the DC power supply,  I'll be using a bridge rectifier,  and LC filter consisting of 4x22000uF 63v caps, and a self wrapped torroid inductor.  It'll also have a bleeder resistor if some undetermined resistance. I'll be adding the rectifier to the secondary output,  and adding the caps in parallel with the gun and work leads,  and adding the inductor to the work lead.  It occurred to me today that by making this mod,  the gun tip will be hot for some time until the caps are drained by the resistor.  It's not the end of the world,  but I'd like to see if I can figure out a way to mitigate it with your help.  In its current state,  the trigger on the gun closes a circuit which contains a relay.   That relay closes the circuit on the primary coil of the main transformer,  and starts producing the stepped down ac voltage for welding..  I want to do 3 things: 1. Initiate a short across the relay supply to the relay drain and closing the transformer circuit until the caps reach a certain voltage. (Nice to have but not critical) 2. Insert a switch between the caps and the gun, it should be closed when the relay is closed (must have) 3. If I can get both of those working,  I can have the bleeder resistor on an open circuit while the welder is on,  and close it when is turned off to start bleeding the caps. I think all three of these can be done with some combination of resistors and transistors.  For the cold tip,  can I use a mosfet?  FDP030N06-ND looks pretty close. The ac supply is 38v 60A(low) or 19v 120a(high), I expect the dc to be close.   The caps I have are 63v though.  Will the extra few volts burn out the transistor since it's only rated for 60v? I know nothing about zener diodes,  but was reading that they should be used to protect the mosfet from back voltage caused by induction in the circuit. How do I size it? For charging the caps,  I believe I can tap the main power to a transistor which classes a circuit bridging the -/+ of the caps, with a resistor to only allow voltage to pass once it reaches a certain potential. If there is enough voltage it would trigger the gate on a transistor and close the short across the transformer relay.  Would this work,  am I over simplify ing it? Last,  to drain the caps when power is off,  I think I can use a transistor to be open while the main power is on,  and close when the power is shut off, letting the bleed resistor is doing is job.   Do they work like this?  What type would it be that is normally closed,  and opened when the gate is powered?  I'll see if I can create a circuit diagram and attach tomorrow,  but please bear with me,  I'm a total noob to electronics, it may be pretty bad.   

Question by DonaldF9    |  last reply

Choosing the right zener diode? Answered

Hi Guys, I want to make a power bank kind of thing that can charge my laptop. Its not at all efficient and a powerbank or rechargable batteries would be better but its a challenge kinda thing. Due to my research I found out that zener diodes can not only prevent backflow but also limit the current. So I was wondering if you guys could help me choose a zener diode. I have attached a picture of the schematics. Please don't comment saying that its not efficient and stuff, I know that. ( Extra info: laptop requires 20 volts 2 amps) Thanks in advance :). -Prickly Potato

Question by The Prickly Potato    |  last reply

Determining values for zener diode

Hi guys, I am quite noob in electronics. I would like to know how to determine resistors and zener diodes values for a battery life indicator similar to this : And if I want to use a battery source of 1.5V, how will the values change? Thanks!

Topic by kurtselva    |  last reply

Zener diode Regulator Assy

I am in need of assitance for assembly instructions for building a 5V power supply from a 12v power supply using axial components. I am not sure of the orientation & solder method of components. Thanks for any help. MCD

Topic by mcoanarmen    |  last reply

zener diode (limit 9v to 5v)? Answered

Can i use zener diode  to limit voltage from 9v to 5v? ( i would use 5v zener diode ) can this work? what else do i need to use? and  is this way efficient? i was thinking to power my phone with this or to charge my light

Question by tealk    |  last reply

Zener Diode to regulate solar voltage

I'm new to electronics, and I'm having trouble with varying voltage. I'm running a 6V solar panel through a charge controller, and out to a lithium battery (3.7V) and a load (3.7V), in this case a GPS data logger. My issue is the varying voltage to the GPS. The GPS works perfectly off the battery (constantly diminishing voltage), but when the solar panel kicks in the voltage increases, the GPS thinks it is being charged, and switches off. The GPS will work on any voltage above 2.75V I was wondering if I put a 3V zener diode in series between the charge controller and the GPS, would this keep the voltage at a constant 3V even if the solar panel is producing the 5V needed to charge the lithium battery?  I hope this makes sense Thanks

Topic by blakea    |  last reply

A 5V zener reduce the voltage in 5V or regulate it in 5V? Answered

I neede to know if a zener diode regulates the voltage or reduces it and also how can I know what type of zener it is.

Question by tgferreira184    |  last reply

What is and how does a Zener Diode work? Answered

I have looked it up, and was utterly confused. Can a helpful somone from the Instructable community explain?

Question by PKTraceur    |  last reply

How to build a 12v to 5v conversor with a zener?

I'm developing a shield for my Arduino Uno and I want to add in it an external power supply. The power source I want to plug in it has four connectors: 5v, gnd, gnd and 12v. The 5v and the gnd pin goes to their respective pins in Arduino, while the 12v pin goes to a 7805 on the shield or to Vin, and the selection is made with a jumper. The only problem is that the connector can be plugged inverted, swapping 5v and 12, which would damage the AT mega. I know zener diodes are useful for limiting power, but I don't know how to use it. I need a simple circuit in which I can plug my 5v supply and it gets 5v to the chip, and in case I plug the connector inverted, to limit its power to 5v to prevent damage or to shut down the power. I can’t use the 7805 on both pins, because it would deliver something like 4v or less if powered with 5v. And something like a led to indicate that the connector is at a wrong position would be nice too. Thank you.

Question by senitram    |  last reply

Diode Help

Hi, i have a bunch of diodes laying around, can somebody explain the diode function on multimeter? sure, there's numbers on the multimeter, but what do they mean? maybe give me a formula? Thank You!

Topic by Sandisk1duo    |  last reply

Zener Set Voltage Signal Circuit (help)

Hey Everyone- I have been researching on ways to send out an electric signal to trip a relay to shut off my battery charger. I did find some simple circuits and I did the math for what I would need and could not find big enough zener diodes and resistors. Battery+(Resistor)(Zener Diode)(Relay Input)(Battery-) I need this circuit to send a 8.2 or 10Volt 15mA signal to my Relay when the batteries reach 235 volts. Following are the SPECS for the Input signal on my Relay::: Control Voltage Range 3-32 Vdc 90-280 Vrms (60Hz) 18-36 Vrms/Vdc Max. Reverse Voltage -32 Vdc - - - - - - Max. Turn-On Voltage 3.0 Vdc 90 Vrms 18 Vrms/Vdc Min. Turn-Off Voltage 1.0 Vdc 10 Vrms 4.0 Vrms/Vdc Nominal Input Impedance 1500 Ohms 60K Ohms 9.0K Ohms Typical Input Current 3.4mA @ 5 Vdc, 20mA @ 28Vdc 2mA @ 120 Vrms, 4mA @ 240 Vrms 3mA @ 24 V Any help on this would be great Thanks!

Topic by rc_rs_ss    |  last reply

how to prevent voltage change using zener diode?

Zener diodes only regulate voltage when it is within its regulation range. in a simple zener regulator, voltage in the resistive load changes as the resistance of the load changes, but this is usually a small change. now, my question is, is it possible to prevent this small change? how?

Question by codestroy7    |  last reply

Does a zener diode work the same as a rectifying diode? Answered

I am making a solar charger and I can only find zener diodes and the voltage and amps I need, do they work the same as a rectifying diode? Thank You!

Question by JaredsProjects    |  last reply

How can I reduce the output voltage of a zener diode?

Hello, My main goal here is to get an LED to light up when it "detects" over 30V, regardless of the specific output of the voltage source. I attached here an image of the circuit that I currently have. The output of the zener diode is about 30V. What I want to do now is reduce this output to 2V in order to light up an LED that has a 1.8-2.2 VDC forward drop and a max current of 20mA.  I was thinking of attaching a voltage divider to this circuit in order to lower the 30V to 2V, but I'm not sure how, especially with the zener diode involved. Can anyone help me?

Question by frossiove    |  last reply

What is zener diode? Can someone send me picture of it?

I need to know about zener diode to make my emergency light. So give complete description of it with a picture.

Question by bishal    |  last reply

Where do the leads of a zener diode connect to in a DC system? Answered

I have a light in my car that takes two incandescent type light bulbs, but when I use both sockets, the bulbs are broken open and some of the glass is melted in a couple weeks. I've bought plug and play LED lights that have multiple LEDs (with a resistor on both the cathode and anode) and just plug into the sockets, and I used both sockets, they lasted about two months. And since I had only one spare bulb in my center console, I plugged it in, and its been working for over a year (this is where I found out that using both sockets made the lights fail). I'm guessing that the when the engine starts, it sends a surge to the light. So I decided, that I'll just make my own light using LEDs, I have everything resistors LEDs and wire, but I'm unsure where to connect a zener diode/s to the LED array (or if a zener diode would even protect the array). I've looked on the net, but some say to solder inline and some say it needs to connect to the ground, and I cant tell which is right for my case. I've included the output of the LED calculator and the specs. below.     Source:                     12V     Diode Forward:       1.8     Diode Amps.:          20mA     Number in Series: 24    Solution 0: 6 x 4 array uses 24 LEDs exactly +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms +----|>|----|>|----|>|----|>|----|>|----|>|---///----+ R = 68 ohms The wizard says: In solution 0: *each 68 ohm resistor dissipates 27.2 mW *the wizard thinks ¼W resistors are fine for your application *together, all resistors dissipate 108.8 mW together, *the diodes dissipate 864 mW total power dissipated by the array is 972.8 mW *the array draws current of 80 mA from the source.

Question by LuciferTengu    |  last reply

What's wrong with using diodes to step down voltage for LEDs? Answered

I always hear that using a resistor to regulate current for LEDs is very inefficient, even for the low power 5mm ones What would using a zener diode as well as resistor do if I wanted to run, say just a handful of 5mm LEDs from 12V? Thanks

Question by .Unknown.    |  last reply

Can Someone explain the working of this Circuit (MODIFIED ONE)?

Hi, here is a circuit that i found in a device .. all i know is that this circuit provides 5.6v constant output at the "output" labelled in the image and takes AC voltage (220V r.m.s. and 50 Hz ). The labels on the diodes were not visible so i used random diodes in the simulation just one thing that the diode labeled "D3" is a zener diode. further that the capacitor is polypropylene film it reads as (1.1k 250v). i don't know weather it is 1.1kF or what because i think its not possible so i have attached an image of the capacitor too. can some one explain how this thing works ?? IN Simulation when i set the value of the AC to 6Vpeak and 50Hz the result is as it is in real life . but when i change the value to 320VPeak(220V r.m.s) the result varies and goes up-to very high values .. it is awesome because it converts ac to dc without any transformer or something so kindly take a look and do tell if u find out something .

Question by UmerJavaid    |  last reply

Simple battery charge level indicator? Answered

I need to be able to see the charge level of a 12v rechargeable battery and want it to be as simple as possible. Would this setup work: 3 zener diodes (at different breakdown voltages 10, 11 and 12 volts for example) with cathodes connected to positive so that when the battery was above their breakdown voltage an led could light up. Here is a diagram:

Question by Scytheon3    |  last reply

How can I power my 5V phone with a 7V solarpanel? Answered

Hey I just bought a lots of 5v zener diodes and I have a solar panel I want to charge my phone with it. How do I connect the Zener diode correctly so I Wont damage the phone? Any schematic on this Any other components I need?

Question by Frederikw2    |  last reply

What is the type of this Diode?

Hi,all Please help me with a specific type of diode's symble is like a zener diode or Schottky diode.

Question by gada888    |  last reply

Why does this boost converter circuit not work?

I tried this circuit using a 3.7v supply and instead of a 12v Zener I used a 5v Zener. I also used a 22uH inductor. I get 5v no load but when I add a load the voltage drops a bit and the current is 50ma max. Why is this not working and what could I change to make it work? If this is the wrong circuit altogether, then what discrete circuit would work?

Question by Davis Lambert    |  last reply

What does DZ stand for ?

I would like to know what DZ stands for in a wiring schematic. Could it be diode Zener? Although I thought that was just Z?

Question by wesfourwood    |  last reply

Charge level indicator?

I need a nice, simple charge indicator. I have a battery pack that holds 4 AA NiMH batteries. Normally they charge up to 1.3V per cell or 4X1.3=5.2V total. I have a solar trickle charger on there too and I'd like to have a little charge indicator.   Requirements are: -low part count -under $10 -small (it's on my bike helmet) I was thinking something with a pushbutton an LED or two and a zener diode. Something that turns on the LED at  greater than 5.2 volts. But I don't have experience with zener diodes. Has anyone seen a system like this around? Can you think one up? -Cheers

Question by snotty    |  last reply

Did I screw up my power converter?

My motorhome has a115v ac to 12v dc with a split transformer, the 2 outer leads went to press in diodes and the middle lead went to neg or pos.(cant remember witch)  it is 40amp converter. one of the diodes was bad and i was only getting 6 volts out so i replaced them both with 40 amp 600 volt ZENER diodes. Are the zener diodes the wrong type to use, all seemed good except my neg and pos polarity were reversed coming out of the power converter, I reversed the terminals at the hook up so polarity would be correct.  Could this discharge my battery when its not connected to 115v.                                                                                             Thank you, Duncan

Question by dsr.    |  last reply

ESD sensitivity of a VFD/LCD module? Answered

I have seen images of people experimenting with these modules but in the datasheets it says that they are sensitive to electrostatic discharge, is there a way of protecting them without cases (to use them for experimenting with micro controllers)  would zener diodes on the inputs and power supply make them less sensitive, or is it a overstressed problem to cover the manufacturer?

Question by 12V    |  last reply

Arduino as USB-client?

I was searching for something fun to make with my arduino when I came across this: I tried to make it work but it didn't work for me. could that be because I used 3.3V zener diodes? If you made something according to the link did it work for you?  

Question by theexternaldisk    |  last reply

How to create a 10w load that turns on once the voltage has risen to 4.09vdc and above?

I want to top balance lithium-iron batteries however, all the BMS that I have seen are rated at 4.25v with an error of +- 0.05v. Is it possible to use zener diodes, diodes and/or 3.2-3.6v LEDs to create a load that turns on at 4.09v with an error of 0.05v?

Question by briandean2002    |  last reply

PICAXE battery voltage monitor

Does anyone have an idea of how one could get a picaxe to monitor its own battery source and light an LED when the voltage drops below a certain value. I am thinking that there might be a way to do it using a ADC input. Perhaps a zener diode could be used and the voltage above its threshold could be measured.

Topic by biochemtronics    |  last reply

over 90W of flyback (back EMF) energy? how to dissipate it? Answered

Continuing my work on the flyback driver, I am investigating methods and practices to protect my MOSFETs from overvoltage conditions. I have measured peaks of as much as 350V across a 250V MOSFET while drawing an arc, and it does not matter what I do it seems like I simply cannot limit the back EMF transients to <250V. I am really impressed by the rugged nature of these MOSFETs, although I have popped quite a few of them. Seeing that they are being bombarded with almost 400V transients, it is a wonder they survive as long as they do. When I added a medium sized reverse biased zener diode in series with a 10 ohm 1 watt resistor, both went up in smoke, especially the resistor! The zener diode survived. I also tried a much larger screw mounted 30V zener diode w/o the resistor and it reached much over 100 degrees C after only a few seconds and I had very little output on the secondary. Judging by how quickly a 10 watt resistor heats up I assume that the back EMF very low impedance and has to be over 90W average!!! I'll need to try to use the integration feature on my scope to measure the average power dissipation accurately. In none of the configurations involving a resistor did I see the voltage clamped any lower than before. :(

Question by -max-    |  last reply

Adding Capacitors to a circuit board

I have a circuit board I made, very simple, you connect a 9 volt battery to it, power opens a relay, and turns on a green led, there is a zener diode (6.1v maybe, cant remember) for a flashing red led, the led flashes if the voltage drops below the voltage of the zener diode.  My questions are; 1.) If I add capacitors to this, will it extend battery life (about 4 hours right now) 2.) If 1 is yes, what kind of capacitor will I use? I work with capacitors every day, but bigger ones like 5mf 330V, 35mf 440v, dont know much about the smaller ones. 3.) If you can make something better, please let me know, it needs a power light, a low battery light, and a relay (SPDT, 9 volt battery is on the coils to keep relay open). Ideally I would like this board to have a long battery life.  Any help would be great.

Topic by EXL949    |  last reply

Battery circuit for Panasonic EY6431 EY9230

Does anyone have the circuit for these batteries please ? There is a temp overload (bimetalic type) and also a two diode (? zener) + resistor in series that I presume identifies the pack (voltage) to the charger.  I have burnt out pack that I have new cells to rebuild but not certain about the connection / values for those parts. Thanks

Topic by GeoffS15  

Can anyone draw me a schematic? Answered

Hey Guys, its been a while since a posted a question.... Anyway I was wondering if anyone could draw me a schematic from this video: Oh and remember to add a zener on the usb output hub of the charger because I think you need that to prevent the phone from sending energy back after the batteries are drained. Thanks in advance. -Prickly Potato

Question by SA-DIY    |  last reply

Low voltage cutout

Hello, I need a simple circuit to switch off a high brightness LED that draws 200ma when my four cell Ni-MH battery pack drops to 4.0v(1.0v per cell) Nothing too complicated, something with a transistor, a comparator circuit, and a zener or an all in one IC? I've tried a few "this should work" circuits and then have been told, "well I haven't actually built one". Thanks.

Topic by jefflahay    |  last reply

This Stepper produces how much miliamp/amp? Answered

6 wires so it's 3 phases after I rectify with 3 briges and a 10 x 8500 mf 65v caps and regulate with power zeners, how much current will I get, can I trickle charge an 10amp sla? Stepper is 2.5" x 3 cube SANYO DENKI TYPE  103H7123-0642 DC 2.5A 1.8 DEG 2.5v-6v each coil I get

Question by celalboz    |  last reply

could anyone spare some help on Tom stepper board I have followed the directions and cannot get it to work help

I used a 12vdc power supply form radio shack and all the parts called out on the list and even went throgh the schematic and picture of the board to try to duplicate, I have since found i have blown the Zener Diode and have repalced it but I just cant get any action. please help

Question by jnjr65  

Can anyone draw me a schematic (done again due to no answers)?

Hey Guys, its been a while since a posted a question.... Anyway I was wondering if anyone could draw me a schematic from this video: Oh and remember to add a zener on the usb output hub of the charger because I think you need that to prevent the phone from sending energy back after the batteries are drained. Thanks in advance. -Prickly Potato

Question by SA-DIY    |  last reply

How to make a voltage controlled switch using a BJT transistor?

Well i just want to know how to use a BJT transistor in a circuit to switch on at a particular voltage. Its for a charging circuit, i want to activate i transistor at 9 volts and the current from that to charge a 6 volt battery. I already tried putting a 9 zener diode at the base of a NPN but the turn on voltage was 16 Volts. I used a C5027R and Vbe is 7V and i am really confused with what Vbe really is.

Question by josh1001    |  last reply

power loss in battery chargers...USB

A transformer, being a pair of electromagnets, such that it reduces the voltage of household power to whatever voltage your battery powered device needs, will cost you somethin if its plugged into the wall, even if yoour phone, laptop, etc isn't plugged in. but it seems that these 5v usb chargers are too small to contain a transformer. I dont think they get warm when they are idly plugged in.  I imagine they may just have a rectifier and zener diode. Is that the case?  Do they waste power when left in an outlet?

Topic by Toga_Dan    |  last reply

LED that light up if the battery is charged

I am making a solar charger for one Ni-Mh battery 3000ma. My solar cell is 2V 300ma. I want there to be an LED that will light up, if the battery is fully charged, I went through alot of articles online, and here is a circuit that I think might work, but I'm not sure, so if you could tell if this is going to work or not, it would be great, and any modifications I can do. I'm not sure about the value of the diode. 

Question by NiKiToS    |  last reply

How to protect OpAmp output?

Hi, I have an OpAmp which controlls the Gate of a MOSFET. When the MOSFET dies, sometimes the voltage it's running on (50V) somehow gets to stand over the OpAmp's output which destroys it. What's the best way to protect the OpAmp from the high voltages that get to stand over the output? Will a zener do the trick? Trigger transformer won't be easy to use here because It's a PWM controller so I need nice block waves. Diode on the output? but won't this be bad for delivering good current to the Gate? ... Any ideas?

Question by DELETED_Electorials    |  last reply

Confused: 12V AC to 12V DC, simple bridge rectifier? Answered

I have a 12V AC power block powering some lights, I want to take one channel off that block and power a 12V DC strip of LEDs, could I just use pretty much any single phase bridge rectifier? They all seem to be rated in the 100's of volts... I know I could do the same thing with a bunch of diodes, a zener and a resistor, but I'd like to just use a packaged chip (because I'm lazy...)?

Question by Icewraithusa    |  last reply

A good explanation and example of a USB interface circuit?

 Every USB circuit I come across seems to be about the same with D- and D+ clamped to 3.6 volt with a zener diode. These wires are then passed to uC's io pins. Am I correct in thinking this setup doesn't take advantage of USB's differential signaling scheme? Because I thought an op-amp was needed for differential signaling. Does anyone know of a good resource, with circuit examples, that explains how USB transceivers work? I'm not interested in the actual protocol (NRZI, and all) I already understand most of that, what I'm really looking for is circuit level stuff.

Question by hacim    |  last reply

Solar engine for a solar boat Answered

 Here of some of my queries.  we need to run a solar powered boat on a 1.4meter long water track in a shortest possible time( max time 5 min given)........ so i would be glad if u let me know the correct solar engine circuit to it..( i mean the capacitor selection , solar panel specifications etc etc) also there are many slar engine circuits online..which one do u prefer (1381,FLED,millers,zener based etc etc)           waiting for ur reply....... thanx in advance........

Question by abdul moiz    |  last reply

How UV resistant is wood? Answered

I'm making a USB solar charger intended to last 20 years. It will have no batteries inside, just a voltage reg and a zener diode. The solar cells will be wired together under glass, not epoxy (for better lifespan). I want the frame to be made of wood, but how long will that last in direct sunlight? This solar charger will contain no plastics, polymers, or my only choice for a frame is glass and wood. THANK YOU SO MUCH!! -Nepheron PS. I chose wood because it is very opaque, and I reasoned that it may be fairly UV resistant... But IDK.

Question by nepheron    |  last reply

Type of diode

Hey everyone, I recently had an ASUS laptop to repair and after troubleshooting, found some damaged components among which is this surface mount diode (kindly see picture). I looked around for a datasheet but cannot find anything. Am also unable to find out exactly what type of diode it is from its code marking. I've had results varying from a 'leakage diode' to '3.3V zener diode'. However, I am suspecting it might be a schottky diode since it was in what looks like a boost circuit. Any help would be greatly appreciated. Code marking: 100 98FP1  j Thanking everyone in anticipation. Kind Regards, Nawaz

Topic by Nawaz    |  last reply

RGB LED Voltage indicator for 15 - 10 volts

I would like to make a one RGB LED DC voltage indicator, 15 – 10 volts in half volt changes.  At first I thought I would use a bunch of zener diodes, but it seems a bit more complicated than that as on my chart how I want the colors indicated.  Any ideas how I can accomplish the circuit?  There are probably new fancy things I could use but am not aware of since it’s been a very long time since I’ve made a circuit.  I am currently just using an analog panel meter.  It would be nice have a colored light indicator.  If it could be done.

Topic by K00kie    |  last reply