[volt-nuts] Replace neons with LEDs in Fluke 845AB

Lou Amadio lou.amadio11 at gmail.com
Tue Jun 7 02:05:01 EDT 2016


Hi Dallas, no, I do not have a curve tracer but I have an oscilloscope and
function generator. What do you suggest?

The +/-15v is really low so I need to do something.

If I change to Si, are R207_8 likely to be lower or higher?

Regards

Lou

..............................................................................................................
On 7 Jun 2016 2:26 am, "Dallas Smith" <dosmith at outlook.com> wrote:

> Hi Lou,
>
> It's normal for some leakage in germanium transistors. Do you have a curve
> tracer?
> If you change them to Si you will have to re-bias them (i.e. R207_8).
> The 84 Hz may change also, might have to adjust C203.
> But should be possible.
>
> Dallas
>
>
> On 6/6/2016 7:33 AM, Lou Amadio wrote:
>
>> For Dallas Smith
>> Thanks for the info. It is in keeping with the original design.
>> My 845AB 15v supplies are currently down and I suspect the germanium
>> transistors around T202 may be leaky?.
>> Am thinking of replacing them with Si transistors. Your thoughts?
>> Regards, Lou
>>
>> On Mon, Jun 6, 2016 at 12:35 PM, Dallas Smith <dosmith at outlook.com>
>> wrote:
>>
>> Hi Lou,
>>>
>>> Its been awhile since I made this mod, but I had the foresight to save
>>> the
>>> project to K04BB's site.
>>>
>>> K04BB /Fluke/Fluke 845A AB <
>>>
>>> http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Fluke/Fluke_845A_AB
>>> Still works great, hope you have the same results.
>>>
>>> Dallas
>>>
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