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Old 6th August 2009, 10:07 AM   #1
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Default wiring up t03 mj15025/24

hi all
im about to start building an amp using the above devices and need a little help identifying the pins

how do i do this ? they have 2 connections and the third is the case
i have the shcematic but the pins on these devices are not marked and i need to know how to wire them

sorry if this question sounds dumb but ive never used the to3 types before

any help would be very much appreciated
regards sheafer
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Old 6th August 2009, 10:21 AM   #2
AndrewT is offline AndrewT  Scotland
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download ONsemi data sheet for the MJ15025/4

BTW,
all To3 BJTs have collector to the case and emitter + base to the pins.
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Old 6th August 2009, 10:28 AM   #3
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thankyou andrew
you are most helpfull as usual
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Old 6th August 2009, 10:44 AM   #4
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ok i downloaded the ap sheet and found my answer

now i have one more quik question

how do i identify the base ,emiter and collector from the shematic
symbol

regards sheafer
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Old 6th August 2009, 10:50 AM   #5
eyoung is offline eyoung  United States
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Hola Sheafer...

Ck out this link for some great info http://www.101science.com/transistor.htm

Regards, Elwood
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Old 6th August 2009, 12:01 PM   #6
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thanks elwood

im sure ill find the info im after in that link

regards sheafer
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Old 6th August 2009, 12:20 PM   #7
AndrewT is offline AndrewT  Scotland
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http://www.101science.com/transistor.htm#INTRODUCTION

Section 2 Typical transistor circuit.
The arrowed leg is always the emitter (e), even when the arrow points in towards the junction (PNP BJT).
The plain leg at an angle is always the collector (c).
The plain leg on the other side of the bar is always the base (b)

Go and find the Pass web site and read about BJT transistors and how to check what they are and how to measure the basic parameters and identify the legs/pins.
Compare FETs to BJTs and even valves/tubes to the transistor, Pass shows how they all behave similarly.
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Old 6th August 2009, 11:52 PM   #8
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thanks for your help guys

its very much appreciated its for a ampslab bi240 build im starting
and i just wanted to be sure i understood

the output section is hardwired and a little bit daunting for me but it seems to be a very nice design and im sure once built will not dissapoint me

regards sheafer
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Old 7th August 2009, 08:14 AM   #9
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hi all
one more q if i may

on a zener diode the end with the black band is negative ?

and the current flows from + to _ ?
is this correct
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Old 7th August 2009, 10:02 AM   #10
AndrewT is offline AndrewT  Scotland
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Hi,
a Zener is a diode.
It is shown as an arrow and a bar in schematics. The arrow shows the direction of current flow.
That bar is also the bar marked on the component.
Fit the bar to the more negative and the diode will pass current from +ve to -ve with a Vf~700mV
Turn the bar towards +ve and the diode blocks current flow, until it reaches it's Zener breakdown voltage.
Now, it operates as a Zener.
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