saturated's all encompassing inclusive and exclusive bin thread

[Tassieviking]

The biggest fault with dishwashers is that something small gets in the drain pump and jams the impeller, just remove the item and it's all good.

The second biggest fault is that someone uses normal dishwashing detergent in them and they over suds and then overflow, this causes a small float switch under the machine to cut the machine out, and usually the drain pump runs all the time.
This happens a lot when people have had a party and some good samaritan decides to load the dishwasher and start it for you.
The best way to kill the bubbles is to add some hair conditioner into the machine, it works really fast and that's what most Hotels do.

I once did a house call and found the drain pump blocked, I stuck my hand into the dirty water and I pulled a used hypodermic needle out of the drain pump. I was not impressed.
Another time I stuck my hand into the dirty water and found they had filled it up with hydrochloric acid to try to unblock the machine, that burnt.

[saturated]

pretty interesting
I think in my case some broken glass put the impeller in a bind and so the pump motor burned up

I tried bringing home washers and dryers for a while and fixing and selling but i guess the mentality is different these days
nobody wants a bulletproof roper or kenmore that will last forever....

oh well rant over

while I got you here I am really struggling with trying to understand how to be safe with oscilloscope grounding.
I was going to put a two prong adapter on the cord to unground it but maybe that is not a good idea.

I dont plan on working on any old tube amps or crazy vintage receivers anytime soon.

I will continue to try and learn how to keep my work safe.

thanks for your help.

[saturated]

I was watching a video on my tv and took a pic of the screen

anybody recognize these guys 



You cannot view this attachment.

[Tassieviking]

while I got you here I am really struggling with trying to understand how to be safe with oscilloscope grounding.
I was going to put a two prong adapter on the cord to unground it but maybe that is not a good idea.
[/quote]

It has been a long time since I used my scope, and my scope is a real CRO.
I usually use one ground clamp that I attach to the 0v rail, as long as the 0v rail is grounded.

All my probes have a removable ground wire so all I am left with is the probe itself, I leave one probe with the ground wire attached.
My old "cathode ray oscilloscope" is nothing like the modern units most people have today, turn it on, have a cupper, use it.

[nosaj]

I tried to post earlier. Do you want a working variac? If so PM for details.
nosaj

[nosaj]

Here is the first one.
nosaj

[nosaj]

Here is the second one.
nosaj

[saturated]

that looks pretty nice
thanks for the offer let me read up on them and see if I can use it
 

[saturated]

btw i brought home a new volt meter

supposed to be real accurate


You cannot view this attachment.

yes it needs a nice hot bath

You cannot view this attachment.

and a power cord...no need for the dbt

You cannot view this attachment.

my limited google indicates possibly it is a kelvin varley divider etc

there is a youtube video of a fluke 881a in action

will be fun to replace the power cord and see if its even close

[saturated]

on my to do list...need to build a curve tracer and connect to my oscilloscope

either that or find a tek 575 

 

[saturated]

alright i wanted to test my new voltmeter

so first task was unsoldering the disintegrating power cord

You cannot view this attachment.

which wasnt easy

hot from transformer

You cannot view this attachment.

ground from fuse holder

You cannot view this attachment.


and green....common?

You cannot view this attachment.

and the disconnected carcass

You cannot view this attachment.

this is a lot of work but oh well i guess its good practice

gonna be all for naught if i get a new cord on there and it fails dbt
because at that point im stopping

also i am discouraged to see silver metal transistors...to me that means germanium...but idk i have no idea

 

[saturated]

so i wired up the replacement power cord..which wasnt looking so great either 
no matter how far back i peeled back the outside sheathing the insulation on the interior wires was crumbling
but it appeared the white insulation was more robust...so i went with it

also the wierd lookin fuse was blown
i do not have anything that remotely resembles this

You cannot view this attachment.

so based on the markings i scared up a plain ol 1/4 amp fuse and stuck it in

next up connected my UDBT (ugly dbt)

powered up...turned it on and all was eerily quiet

You cannot view this attachment.

I thought well something is open somewhere...this is too good to be true...was fixing to disconnect everything and to my astonishment saw a light on

You cannot view this attachment.

so i guess my next move is to input a known voltage and then try to rotate the bottom knobs until it matches up....

 

[saturated]

i tried it out for a while but didnt get too far

You cannot view this attachment.

amazingly all 4 lights at the bottom work

its def responding...if i turn the second digit to zero the meter deflects

You cannot view this attachment.



and back to one which i presume is ten....it goes back

You cannot view this attachment.


oh well that was fun

time to catch the rest of some football

[Tassieviking]

on my to do list...need to build a curve tracer and connect to my oscilloscope

I don't know if you have a transistor tester yet, but a modern one can be a great item to have, for very little money you can pick up something that can do some amazing measurements on components.
I bought one several years ago but I think I need a new better one as they get better so fast.
I bought one without a case but then ended up buying a case many years later so the final cost was the same as one with a case in the first place.
The old one I have now is in this video on you-tube, the one on the right.
It would be worth spending some time and finding a very cheap one that can do everything the more expensive ones can do, just have to keep looking till you find one.

https://www.youtube.com/watch?v=-pEmM0Kt2UY

Cheers
Mick
 PS...If you find a great cheap one ....let us know

[g1]

See this page, particularly 'differential voltmeter' and the explanation of the 5 knobs:
https://control.com/textbook/dc-electricity/null-balance-voltage-measurement/