Part Number: HJ Function: NPN Epitaxial Silicon Transistor Maker: Unspecified Pinouts: HJ datasheet. Description: Datasheet. Type Designator: MJE Material of Transistor: Si. Polarity: NPN. Maximum Collector Power Dissipation (Pc): 40 W. Maximum Collector-Base Voltage |Vcb|. HJ Hefei Hejing datasheet pdf data sheet FREE Datasheets (data sheet) search for integrated circuits (ic), semiconductors and other electronic.
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Want to add to the discussion? Then test the other two legs. Not to worry, I have 2 exactly the same. I made it simpler from the rambling. For instance, a beta gain transistor circuit would light up one LED if the gain is overa different LED if its over but underand so on.
Info about building and modding: Thank you my friend, this is very helpful. With a DMM, you can test the legs and each pair that has low resistance is a forward biased junction, any pair that has high resistance is a reverse biased junction.
Im going to assume the emitter is the large pad, so the base is going to be one of the others, and the collector is obviously the last. Now amend that circuit so that the negative side of the battery or ground if you want to call it is touching one leg of your transistor, and another leg is touching the LED.
This is an open community for the do-it-yourself pedal builders of reddit! When the voltage rises high enough it would activate the junction and conduct. FYI this is a high voltage transistor designed for switching operation, very commonly found in compact fluorescent lamps.
Welcome to Reddit, the front page of the internet. Become a Redditor and subscribe to one of thousands of communities. But I’m not positive it was the right datasheet.
MJE , Tube MJE; Röhre MJE ID, Transisto
Log in or sign up in seconds. I found this in a light bulb, but can’t tell which leg is which. C is probably the tiny pad, B is probably the long rail pad, and E is the large square pad. The silicon is normally bonded to the collector, which would match the ECB left to right, flat writing side facing you, pins facing downwards pinout of the CD Looking for troubleshooting help?
If you don’t have a DMM, use ohms law to build this https: If you don’t have a DMM, use ohms law to build this. Submit a new link. If the LED does not light up, then reverse the two legs and if it lights up, you now have one diode.
Submit a new text post. Please read this first! Basically, you create a circuit that needs the transistor to behave with X amount of gain otherwise the current is too weak to light the LED. Put two of the legs between the LED. Sorry if this is a very pedestrian question, I’ve already tried my best on google: You could test this yourself you know.
The base must also be negative with respect to collector and current will flow. In NPN, the opposite is true.
If you have a DMM, you should read something like megaohms between a forward biased base-collectopr and a forward biased base-emitter. Transistors function in their active region as class A amplifiers thanks nj the base-collector being reverse biased while the base-emitter is forward biased. Can anybody help me identify the legs of this transistor?
It’s dead, you need a new transistor. The alternative is that the P side must be at least more positive than the N side respectively. If the LED still lights up, then the legs are of 31002 diode in ‘proper orientation’. Can anybody identify which leg is which from the insides? I don’t have a DMM but I’ll have to look into it. I just cracked open this one hoping to illuminate which pin is which.
Doing so would actually improve your knowledge and and your soldering skill and get you some really cheap tools, although DMMs these days aren’t very expensive. You can create your own test equipment for general guidelines if you’re creative.
It lights up if the diode of the transistor is forward biased. You will, of course, read the same unreadably high ohm resistance between collector-emitter regardless of bias.
You should read open circuit or beyond the measurement of your DMM in ohms for reverse biased base-collector or base-emitter. So I’m attempting my first pedal, and I’m totally new to electronics altogether. In a PNP, the base is the N, so it must be negative with respect to the emitter and it will be biased and current will flow.