Author Topic: What is this  (Read 640 times)

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Offline AirScooter

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What is this
« on: March 22, 2021, 01:05:47 pm »
Can anyone tell me what this is please. It is marked E505 and has a single red dot on its top.
 

Online retiredfeline

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Re: What is this
« Reply #1 on: March 22, 2021, 01:13:32 pm »
I wish your second picture was sharper and zoomed in on the item. It looks like a transistor, if has 3 terminals. Or maybe a LED if 2 terminals and the top is red.

Those are some seriously old ceramic DIPs.
 

Offline SeanB

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Re: What is this
« Reply #2 on: March 22, 2021, 01:23:53 pm »
Normally hat package was a diode or transistor, led's in this generation did not use the ceramic and epoxy fill package, but used a modified TO18 package with a glass top to allow light out. Very likely a transistor that has had the absolute snot blown out of it, but the case did not shatter. But a better image is needed, especially of where it goes on the board.

Looking at the board and the front that screams old Fluke, it probably is a reference diode, likely 6V8, either a simple temperature compensated zener, thus the looking like a capacitor, because there are 2 compensation diodes in the package, or a speciial Fluke zener, which is pretty much the same.
« Last Edit: March 22, 2021, 01:26:58 pm by SeanB »
 

Offline xavier60

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Hioki AS100D vom, HP 54645A dso, Fluke 87V dmm, AN8008 dmm, Agilent U8002A psu,  FY6600 function gen, New! Brymen BM857S-(With Battery)
 

Online retiredfeline

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Re: What is this
« Reply #4 on: March 22, 2021, 01:31:02 pm »
led's in this generation did not use the ceramic and epoxy fill package

I was remarking on the DIPs in the sockets.
 

Online Jwillis

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Re: What is this
« Reply #5 on: March 23, 2021, 09:11:05 am »
I can't really see it well but I keep getting a reference of the E505 as a 1ma JFET current regulator .
 

Offline Gyro

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Re: What is this
« Reply #6 on: March 23, 2021, 10:57:33 am »
I can't really see it well but I keep getting a reference of the E505 as a 1ma JFET current regulator .

Agreed. I just pulled out my 1979 Siliconix Plastic FET databook - The TO92 equivalent, the J505, is a 1mA current regulator diode (JFET type).  Replacement is available from Linear Systems...

https://shop.micross.com/pdf/LSM_J505_TO-92.pdf


P.S. It probably wouldn't be recognised correctly on a cheap transistor tester.
« Last Edit: March 23, 2021, 11:02:58 am by Gyro »
Regards, Chris

"Victor Meldrew, the Crimson Avenger!"
 

Offline tszaboo

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Re: What is this
« Reply #7 on: March 23, 2021, 11:08:11 am »
I think that is two blurry images.
Former username: NANDBlog
 
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Offline Shock

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Re: What is this
« Reply #8 on: March 23, 2021, 12:11:36 pm »
It's a... have you checked the Fluke 8000A schematic and parts list?
Soldering/Rework: Pace ADS200, Pace MBT350
Multimeters: Fluke 189, 87V, 117, 112   >>> WANTED STUFF <<<
Oszilloskopen: Lecroy 9314, Phillips PM3065, Tektronix 2215a, 314
 

Offline Psi

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Re: What is this
« Reply #9 on: March 23, 2021, 12:17:22 pm »
Can anyone tell me what this is please. It is marked E505 and has a single red dot on its top.

That's not a component, that's a spider.
Greek letter 'Psi' (not Pounds per Square Inch)
 

Offline cheater

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Re: What is this
« Reply #10 on: March 23, 2021, 03:43:13 pm »
This could well be a reference diode used as a voltage reference for the DMM to compare other voltages against (and essentially all other measurements). If you replace it you'll have to recalibrate your meter.
 


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