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Author Topic: very old variable psu transistor pinout needed  (Read 848 times)

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Offline METopic starter

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very old variable psu transistor pinout needed
« on: May 10, 2025, 02:55:28 pm »
I have a very old variable psu with an old ME8003 npn TO106 style case , I cant find any pinouts ,can anyone help?, i found its specs but no pinout.
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Online Andy Watson

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Re: very old variable psu transistor pinout needed
« Reply #1 on: May 10, 2025, 03:16:51 pm »
My Towers Transistor book says it is:

NPN, TO105 package, 60V, 800mA, 400mW, hfe 100.

It also says that is was manufactured by MicroElectronics Ltd. Here is one of their data books.
http://bitsavers.org/components/microElectronicsLtd/

It does not list the ME8003, but page 369 gives their package outlines.
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Offline METopic starter

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Re: very old variable psu transistor pinout needed
« Reply #2 on: May 10, 2025, 04:09:38 pm »
Many thanks andy , That was a big help,just need to find a sub now,will look at a bc108 as ive a few kicking around in my junkbox.
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Offline METopic starter

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Re: very old variable psu transistor pinout needed
« Reply #3 on: May 10, 2025, 04:15:22 pm »
Think i will try a bfy50, they match better than bc109.
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Offline madires

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Re: very old variable psu transistor pinout needed
« Reply #4 on: May 10, 2025, 04:29:38 pm »
If 50V are fine maybe a BC337, otherwise a BC637.
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Offline METopic starter

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Re: very old variable psu transistor pinout needed
« Reply #5 on: May 11, 2025, 12:36:58 pm »
would a bdy39 be 0k? , I am trying to use whats in my junkbox.
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Offline madires

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Re: very old variable psu transistor pinout needed
« Reply #6 on: May 11, 2025, 01:06:54 pm »
You're looking for for a jelly bean NPN with a slightly higher current capability (0.8A). BDY39 is power NPN in a TO3 package and could be used as a pass transistor (needs high base current). BFY50 is an RF NPN. Could you please post the circuit diagram? Maybe we're able to narrow down the required specs.
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Offline METopic starter

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Re: very old variable psu transistor pinout needed
« Reply #7 on: May 11, 2025, 07:40:37 pm »
Sorry i meant bd139 the pinout doesent matter,heres a pic of the pcb from 1960/70s i guess,it has no model or name. [ Attachment Invalid Or Does Not Exist ]
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Offline METopic starter

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Re: very old variable psu transistor pinout needed
« Reply #8 on: May 11, 2025, 07:42:38 pm »
againe.
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Offline madires

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Re: very old variable psu transistor pinout needed
« Reply #9 on: May 11, 2025, 07:48:19 pm »
A BD139 might work.
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