Yellowish substance covering circuit board

Started by Andy in sci.electronics.design4 days ago 3 replies

This is a contact-less charger from an electric toothbrush.(NiCd) What is the yellowish substance that is covering the circuit...

This is a contact-less charger from an electric toothbrush.(NiCd) What is the yellowish substance that is covering the circuit board? https://www.dropbox.com/s/9azo34ohkppdho6/NiCd_Charger.jpeg?dl=0 Thanks.


First in Series of Promised "Secret Sauce" Circuit Ideas Has Been Uploaded

Started by Jim Thompson in sci.electronics.design5 days ago 13 replies

First in Series of Promised "Secret Sauce" Circuit Ideas Has Been Uploaded.... Click on the "Secret Sauce" link on my home page. ...

First in Series of Promised "Secret Sauce" Circuit Ideas Has Been Uploaded.... Click on the "Secret Sauce" link on my home page. ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus ...


plc automatic code generator

Started by edgar suarez kummers in sci.electronics.design5 days ago 10 replies

Good day nice people: Please does anyone of you know about a plc automatic code generator. Thank you very much for your answer edgar

Good day nice people: Please does anyone of you know about a plc automatic code generator. Thank you very much for your answer edgar


pcb fab house

Started by Yzordderrex in sci.electronics.design5 days ago 10 replies

I am looking for a fab house for pc boards. I have graduated from PCB Express (or is it Express PCB?) into PADS. I will be looking for prototype...

I am looking for a fab house for pc boards. I have graduated from PCB Express (or is it Express PCB?) into PADS. I will be looking for prototype quantities mainly 4 layers with route-able inner layers. Heavy copper > 4oz would be good. I am not looking for the most inexpensive, I just want a fair price. If you have a house you use and like please pass it on. Thank you. Bob


Like tin whiskers on steroids!

Started by Cursitor Doom in sci.electronics.design6 days ago

https://www.youtube.com/watch?v=IrdYueB9pY4 -- This message may be freely reproduced without limit or charge only via the Usenet...

https://www.youtube.com/watch?v=IrdYueB9pY4 -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usenet protocols constitutes acceptance of this condition.


Regarding throretical versus real-world reflection coefficient curves

Started by Anonymous in sci.electronics.design6 days ago 2 replies

Could some electronics guru shed some light on this ? The curve of the absolute value of the reflection coefficient vs. frequency(derived from...

Could some electronics guru shed some light on this ? The curve of the absolute value of the reflection coefficient vs. frequency(derived from a Smith chart assuming lossless transmission line) for a simple circuit consisting of a signal generator driving a complex load through a transmission line and complex source impedance, looks exactly as expected, with the reflection coeff


OT: sick

Started by John Larkin in sci.electronics.design6 days ago 54 replies

I was intending to ski my ass off over the holidays, but got only two days before being whacked by the flu thing going around....

I was intending to ski my ass off over the holidays, but got only two days before being whacked by the flu thing going around. Coincidentally, I got a great book as a Christmas present, so had something to read: https://www.amazon.com/Great-Influenza-Deadliest-Pandemic-History/dp/0143036491/ref=sr_1_1?ie=UT F8&qid=1514746816&sr=8-1&keywords=great+influenza The first hundred pages are no


Reverse Engineering the MOS 6502 CPU

Started by Tom Del Rosso in sci.electronics.design6 days ago 1 reply

This presentation is interesting and also funny. https://www.youtube.com/watch?v=fWqBmmPQP40 --

This presentation is interesting and also funny. https://www.youtube.com/watch?v=fWqBmmPQP40 --


Dumb question on noise source

Started by David Eather in sci.electronics.design6 days ago 15 replies

My test gear (along with most of my brain) have been packed away, so I can only ask this as a question rather than lash it up and know. I...

My test gear (along with most of my brain) have been packed away, so I can only ask this as a question rather than lash it up and know. I have a +/- 5v source and a 6.8v zener diode as a noise source. I'm expecting about 0.3mV noise. My question is: will I get more noise by biasing with a resistor (about 3.3k) or biasing with a constant current source. TIA -- I look forward t...


Gasoline prices....

Started by Jim Thompson in sci.electronics.design6 days ago 16 replies

Gasoline prices.... "... the state with the lowest gas price is Arizona at $1.54" ...Jim...

Gasoline prices.... "... the state with the lowest gas price is Arizona at $1.54" ...Jim Thompson -- | James E.Thompson | mens | | Analog Innovations | et | | Analog/Mixed-Signal ASIC's


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