开云体育

Indeed, I found the SRAM datasheet, data retention is min. 2V. So I think with my Li battery still at 3.6V I am still OK. I checked the PS, especially the caps, none of them look bad, I will try to

Look to see what the lowest voltage is for data retention.? The 4.5 volts is the minimum for successful writing and reading. Data may be retained, but not manipulated, at lower voltages.? You see

"I don’t have a ‘megger’ or anything similar, so measuring leakage from the focus pot is not possible, other than with my DMM" Measure across each resistor in the series "chain" rather than

As Tom wrote data retention voltage can be lower than operating voltage. Sony datasheet specifies min data retention voltage as 2V. Ozan

An SRAM cell is a latch, and the voltage required to maintain the latching condition can be quite a bit lower than the value to read and write at datasheet speeds. A backup battery only needs to give

Adding to my above post: I am a bit puzzled because the Sony Sram requires min. 4.5v and the Li battery only supplies 3.45v to the Sram, how did that ever work ???

I think so, the battery model is ltc-16p-co-f-s2 from Keeper / 3,5v 1,6ah, a pretty big block and only a + and - connection. The Sram is Sony CXK58257P-12L where I measure 3.45v between gnd(14) &

Morning all, I've got about 70 plus Nuvistor tubes that need a new home. These are nearly all NIB NOS. 6CW4's, 6DS4's, 6DV4's, one 13CW4, and about 35 2 volt versions. I've checked all the boxes to be

Some units had a Li-SOCl2 non-rechargeable primary cell soldered to the main board to keep RAM powered, instead of the Dallas SRAMs. Is that what you’ve got?

Hi, Bob, it looks like it is a bit different in my 2432A. There is a big 1,6Ah 3,5v li batterij without Sram underneath. It stll measures 3.6v so I guess this one should be ok? I will concentrate on

This sounds like a handy device, and I particularly like the the reference and DUT inputs displayed on the screen at the same time. This is similar to the Huntron. However, I have to add to the other

Gordon, If a sub transformer is too much to deal with, use a 12V battery and a resistor of 10-12 ohms at 15W in series to drop the voltage from 12-13.5V. That will totally isolate any leakage. It is

Thanks Mark & Morris. I like the idea of replacing the 5642’s with silicon, so I’ll order the 2CL2FLs from Amazon. One less thing to go wrong. Strangely, Digikey doesn’t seem to carry them. It

Thanks Andy. Yes - I noticed on the schematic those parts have a box around them, so I assume my old beast doesn't have them. Good luck on your intensity control problem. Would love to hear of any

My first Science Fair project, in 1972 at age 12, was to convert a TV into a scope. I paid $2 to an ad in the back of Popular Electronics to get "plans" (it was just 4 mimeographed pages). The scheme

There's a popular open source project for creating oscilloscope music with images and 3D effects called osci-render https://github.com/jameshball/osci-render. With the MIDI control feature you could

Missed it AGAIN! ?

For a DIY alternative: https://www.qsl.net/kd7rem/pdf/octopus.pdf [email protected]> wrote:

Hi Gordon, Mark has a good point. There's leakage to ground somewhere in that divider chain. I have had experience of leakage both in a pot (focus) or in the CRT heater winding. You should check both.

<forehead slap> You can do that with any electrostatically-deflected jug, dag or no. I was recalling my failed attempts at trying the experiment with a TV crt. "Never mind." -- Emily Latella