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 Forum: General Discussion   Topic: unmarked transformer

Posted: Wed Dec 06, 2017 2:36 pm 

Replies: 8
Views: 266


I forgot to mention in the previous post that if a 120 volt light bulb, like 100W is placed in series with the line power, any connections, even a dead short, will not hurt the transformer or blow a fuse. The lamp will be bright if the connection is shorted, or made to a low voltage secondary, and d...

 Forum: General Discussion   Topic: unmarked transformer

 Post subject: Re: unmarked transformer
Posted: Sun Dec 03, 2017 8:24 pm 

Replies: 8
Views: 266


Solar3000 It seems you are somewhat unfamiliar with transformers, so here is some information that may be of value to you. There is a great deal of information about transformers but here are some of the more common interest items. A 'true transformer'.... (see below) Has both primary and secondary ...

 Forum: General Discussion   Topic: Iron wire inductor

 Post subject: Re: Iron wire inductor
Posted: Thu Nov 16, 2017 8:51 am 

Replies: 12
Views: 432


Never allow the facts to stand in the way of a good theory!
If the facts and the theory conflict, dispose of the facts.

 Forum: General Discussion   Topic: Iron wire inductor

 Post subject: Re: Iron wire inductor
Posted: Wed Nov 15, 2017 1:22 pm 

Replies: 12
Views: 432


Well, I was basing the post on my repair experience for older ovens. The transformer supplied both the filament and the high voltage, so to lower the filament voltage was a major redesign because the two windings were interconnected. I am sure, with an inverter design, the voltages could be adjusted...

 Forum: General Discussion   Topic: Iron wire inductor

 Post subject: Re: Iron wire inductor
Posted: Tue Nov 14, 2017 12:35 pm 

Replies: 12
Views: 432


A note about microwave ovens...and stuff! The magnetron is an all on, or all off device. The power is cycled to it with a varying duty cycle to control the cooking power. If the supply voltage were reduced, the magenetron would probably function outside it's design limits and it may fail, or simply ...

 Forum: General Discussion   Topic: Microwave oven transformer... reversed.

Posted: Wed Nov 08, 2017 4:44 pm 

Replies: 10
Views: 515


I once rewound a 24 volt, not so smart fork lift battery charger, for 12 volt service, one heck of a boost charger that one was!
The formula you need is Lotta Amps=Lotta Fun! :shock:

 Forum: General Discussion   Topic: Temperature sensor opinions!

Posted: Thu Oct 26, 2017 4:47 pm 

Replies: 15
Views: 640


Yes, that's what will be used in the micro controller version.. The switch was cleaned and lubed and has been pretty good so far. The solid state switches are low resistance when on, but not zero. Since the PT-100 is a low resistance sensor, this will cause some error. I plan to use a short piece of...

 Forum: Computer Programming   Topic: old windows 2K question something weird issue

Posted: Wed Oct 25, 2017 3:48 pm 

Replies: 14
Views: 697


What happens in safe mode?
Does task manager/ performance show unusual CPU or memory use?

 Forum: General Discussion   Topic: Temperature sensor opinions!

Posted: Wed Oct 25, 2017 3:43 pm 

Replies: 15
Views: 640


Thanks for the interest, but I am not working on a temperature controller design. I am working on using a commercial controller but only as a display, switching multiple PT-100 sensors onto the same control. I am using a rotary switch for testing but the end result will be a micro controlled switche...

 Forum: General Discussion   Topic: MCM is no more...

 Post subject: Re: MCM is no more...
Posted: Fri Oct 20, 2017 2:04 pm 

Replies: 4
Views: 324


Newark years ago was competitive but lately they seem like the silver platter under the beans and bread bowl! FYI: Do you know that http://www.zoro.com is a spin-off from Grainger? They carry many of the same products, at a lower price and offer free shipping for $50+ orders. They have a bad search ...

 Forum: General Discussion   Topic: Ink Drowned my AIO Printer

Posted: Tue Oct 10, 2017 9:36 pm 

Replies: 14
Views: 557


And you would think that the printers that sit turned on for days without printing could be programmed to go through a quick dance routine every couple hundred hours if no printing was done to clear the nozzles. The cleaning cycle by printing lines on paper uses a lot of ink that probably could be s...

 Forum: General Discussion   Topic: Ink Drowned my AIO Printer

Posted: Tue Oct 10, 2017 3:41 pm 

Replies: 14
Views: 557


My many words on ink and toner... Some printers, even laser printers, will flag a cartridge as bring empty based on page count not product left. There is often a toner bypass method that gives quite a bit of printing from the 'empty' cartridge. Also if a laser printer starts to print lightly, take o...

 Forum: General Discussion   Topic: Temperature sensor opinions!

Posted: Sun Oct 08, 2017 9:40 am 

Replies: 15
Views: 640


I think I'll hook it up with a rotary switch to see how close the sensors are, and the effect of trimming, before I go too far.
One error at a time!

 Forum: General Discussion   Topic: Temperature sensor opinions!

Posted: Sun Oct 08, 2017 7:16 am 

Replies: 15
Views: 640


Remember even old choirs learn new songs! Yes, that's where I have been headed. I may even put the SSRS and trimmers under a styrofoam wrapper for better stability but not go all the way to a crystal oven! About accurate temperature measurements.... In an old British cookbook, a recipe's instruction...

 Forum: General Discussion   Topic: Removed as duplicate

 Post subject: Re: Removed as duplicate
Posted: Sat Oct 07, 2017 1:26 pm 

Replies: 3
Views: 214


I don't really care if the redacted posts are there or not, but just seem seems like unnecessary clutter

Yeah, I know about pudgy prods, so maybe a new service for manicurists could be "Finger Sharpening" :cool:
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