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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I don’t have a DMM but I’ll have to look into it. Not to worry, I have 2 exactly the same. I found this in a light bulb, but can’t tell which leg is which.
HJ PDF – Vcbo=V, NPN Transistor –
Can anybody identify which leg is which from the insides? Put two of the legs between the LED. 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.
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.
Sorry 1302 this is a very pedestrian question, I’ve already tried my best on google: Submit a new link. If you have a DMM, you should read something like megaohms between a forward biased base-collectopr and a forward biased base-emitter.
I just cracked open this one hoping to illuminate which pin is which. The base must also be negative with respect to collector and current will flow.
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. Looking for troubleshooting help?
HJ13002 PDF – Vcbo=600V, NPN Transistor
You should read open circuit or beyond the measurement of your DMM in ohms for reverse biased base-collector or base-emitter. You can create your own test equipment for general guidelines if you’re creative. If the LED does not light up, then reverse the two legs and if it lights up, you now have one diode. This is an open community for the do-it-yourself pedal builders of reddit!
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.
So I’m attempting my first pedal, and I’m totally new to electronics altogether. You will, of course, read the same unreadably high ohm resistance between collector-emitter regardless of bias. It’s dead, you need a new transistor.
I made it simpler from the rambling. C is probably the tiny pad, B is probably the long rail pad, and E is the large square pad. Welcome to Reddit, the front page of the internet.
You could test this yourself you know. Info about building and modding: It lights up if the diode of the transistor is forward biased. FYI this is a high voltage transistor designed for switching operation, very commonly found in compact fluorescent lamps. Want to add to the discussion? Become a Redditor and subscribe to one of thousands of communities.
Transistors function in their active region as class A amplifiers thanks to the base-collector being reverse biased while the base-emitter is forward biased.
113002 Log in or sign up in seconds. 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. In NPN, 10302 opposite is true. 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 Thank you my friend, this is very helpful.
When the voltage rises high enough it would activate the junction and conduct. This is a transistor diode tester. But I’m not positive it was the right datasheet. I know the Base is typically in the middle, but i googled the numbers from the face,HJ, B1 and found a datasheet for the HJ Transistor, which said the Base was the leftmost leg. The alternative is that the P side must be at least more positive than the N side respectively.
If you don’t have a DMM, use ohms law to build this https: Please read this first! If the LED still lights up, then the legs are of a diode in ‘proper orientation’. 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.