@ScientistSmithYT Yes, there's some narrow minded thinking going on here. It's going on in the mind of the person who has to ask basic questions about electricity, but can never admit to not knowing or underdstanding things.

I didn't say using "phase" as a name for the "live" wires in an AC system is wrong. I said it has a deeper meaning that you don't seem to grasp.

Hello world. Looking for someone who has worked with the mcp23017 gpio extender chip. Can we individually address each pin - for output or input? Or can we only address the PORTs?

@deostroll A quick look at the datasheet gives me the impression that you have to address whole ports. [This thread on the Raspberry Pi forums](raspberrypi.org/forums/viewtopic.php?t=108931confirms that impression

This thread on the Raspberry Pi forums confirms that impression.

To modify a single output pin, you read in the whole port, change your one bit, then write the whole port back out.

@ScientistSmithYT Oh, and about definitions and reality? You'll recall I tried to get you to do an experiment so that you could see the reality - but you weren't interested.

@JRE to modify? You mean toggle here?

@deostroll Yes.

@JRE Just because I'm not interested doesn't mean I'm being narrow minded. And just because I ask some simple questions doesn't mean I'm narrow minded. And I have admitted to not understanding and knowing things, if you'd recall. It seems that I've touched a sensitive subject for you. The way you're reacting won't help your situation. I know the deeper meaning, but that meaning also has other meanings.

@JRE Like I said don't always assume.

@JRE. Here, I'll do the experiment to prove a point that I already know if you want me to. And again quoted empty text means nothing because it's empty. I forgot to also say that the bold text are also empty. If you want to use it, it's up to you.. But it won't emphasize anything to me.

@JRE So if you want me to do the experiment you can go ahead and give me the links to the materials and instructions again and I'll do it.

@ScientistSmithYT It's all there in chat if you roll back to the earlier comments.

@JRE Ok

I want to make a high voltage high frequency and high current arc pen. I'm looking for a 5 Volt 1 Amp Micro USB charging module that can be used to charge a 3.7 volt LiPo Battery Pack. I need a voltage booster module to step up the 3.7 volts to something higher. (That part I'm not sure about yet) Then I'm looking for a high frequency high voltage (3 - 6 kV) module. Does anyone know where I could get those types of modules? Especially the 3 - 6 kV high frequency module.

The dimensions of the pen case is 2.1 cm diameter. The length is 6 cm.