开云体育

How about pictures of the slide calculator, both sides.

Forgive my error in terminology. It is not grey as in color, it is Gray named for the author of the patent who gave it the name Reflected Binary.

I recently bought a “hybrid” - a slide rule with an electronic calculator on the back. These were made by Faber-Castell but it was not long before they were eclipsed by the electronic calculators

I remember them being advertised in so many techie magazines 50+ years ago. We called them "math grenades". I now have one, they are a work of art. The massive desktop calculators by Marchant, Monroe,

Another marvel analog mechanical calculator , of more modern vintage is the " Curta " , popular in the 1950's to 1970's, but then eclipsed by the pocket

I found out how to send pictures of the 'scope screens This link shows TP75 on schematic 9 in yellow and the collector of Q1062 in Purple. 10 uS/div and 5v/div The 'scope ground is on Ref 1 just

Thanks Mark, I replaced R1020 although it was not bad. The troubleshooting for that circuit using a power supply says the switch should activate from 20 to 25 volts. Mine latches at 17.5 volts. I

Peter, R1020 is known to go bad. That should be 2W. Make sure to get a resistor that is about 15mm long. Some 2W resistors are 3.68 x 8.72mm which is smaller than a 1/2W. C1034 is originally a

I checked the Inverter Drive power supply and it works for seconds until something shuts the drive off. The power supply draws normal current for up to 5 seconds and the pulses appear on TP75 then

I posted this once but it did not show up. I put a power supply in from another 'scope. It starts right away. The problem is definitely in the power supply. The power supply runs out of the 'scope

wrote: My $0.02 bet is that you didn't entirely get the grime/oxidation off the contacts, so spraying with something like DeOxit and working the encoders might clear it up. Note that gray codes

I have stopped refurbishing test gear for fun to focus on other more RF-ish design pursuits. As I can't abide having stuff around that isn't being used, I have started pulling equipment from my bench

The CRT face looks small.? On mine, the CRT area goes from the middle of the power switch to the middle of the top control.? I suspect that you have one that has been modified.? Look for the mod

That will be a nice scope once you get it cleaned up and repaired. Congratulations on finding one. Careful, though, as they're addictive. Barry - N4BUQ

As all three grey-code encoders are multiplexed and all three are exhibiting large jumps, look for a failure in the components that are common to all three (e. g. selector, bus driver, diode,

Yes, you found the right info. The WE document shows in fig. 6 an example bounce of 500 us, and in chapter the 3.2 calculation the specified bounce time is 10ms. That is also the value I normally use.

Rogerio O <rodd414@...> added the photo album A Challenge - Fix this REALLY Beaten 7904 ( /g/TekScopes/album?id=293557 ) : 7000 series scopes for sale are very rare in Brazil.

It will not be dissipated by the Hi-Z of the input, but by the *Lo-Z* of the HC139 *output* transistor which selects the corresponding switch. About bouncing duration see oscillograms

I put a power supply in from another 'scope. It starts right away.1. The problem is definitely in the power supply. The power supply runs out of the 'scope with a load per the manual. Installed in

I've never seen bouncing that short, but you may have excellent bouncing encoders. Most people use 10..100nF and that will hurt. Yes, I studied the diagram on that page. Cap over resistor is same as