Re: tektronix 7S14 batteries and time base question

Bruce Griffiths

You'll need to series stack a couple of silicon photodiodes for that to work.
The photocurrent will need to be around 50 microamps or so to keep the output resistance low enough.
A shunt capacitor may also be required.


On 26 December 2019 at 16:51 Leon Robinson <leon-robinson@...> wrote:

Would a led to photodiode optocoupler work?

Leon Robinson    K5JLR

Political Correctness is a Political Disease.

Politicians and Diapers should be changed
often and for the same reasons.

On Wednesday, December 25, 2019, 9:39:19 PM CST, Gary Robert Bosworth <@grbosworth> wrote:

It is a shame that the original spacing for the batteries was so tight.  I
realize the need to keep the leads short, but it makes it difficult to
replace the Mercury cells in such a tight spot.  It would be nice if
someone could come up with a tiny hybrid fix that could be dropped into the
small footprint.


On Tue, Dec 24, 2019 at 11:21 AM Bob Headrick <bobh@...> wrote:

Efficiency as measured by voltage transfer, it would be interesting to
compare power transfer efficiency.  With 20mA on the driven LED is it
possible to get even a few microamps of output current?

  - Bob W7OV

-----Original Message-----
From: <> On Behalf Of Miguel Work
Sent: Tuesday, December 24, 2019 8:49 AM
Subject: Re: [TekScopes] tektronix 7S14 batteries and time base question

IR wins! :)

IR              1,16            0,85            73,28%

RED            1,9            1,3            68,42%

YELLOW  2              1,2            60,00%

BLUE            3,2            2,3            71,88%

Gary Robert Bosworth
Tel: 310-317-2247

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