John's Electronics and Tech Stuff

A Blog about electrical and electronics stuff. It's also meant to be a little educational, and also to be a another resource to the guys I'm training at work. I plan to go through the old Navy Electricity and Electronics Training (NEETS) series, and then into Programmable Logic Controllers, SCR Motor Drives, Variable Frequency AC Vector Drives, and how all these things talk to each other and get their information to control and display screens.

Sunday, April 7, 2013

Relative Power

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Today - something we talked about last week in "class" Relative power. In the circuit below - We have three voltage div...
Thursday, April 4, 2013

Kirchoff's Voltage Law

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Here is a powerful concept, that may seem a little trivial at first, but its usefulness will grow if you stay with electronics stuff: Put...
Tuesday, April 2, 2013

Some Thoughts on 1/4 Watt Resistors

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Today we visit power and how it affects the limits of voltage we work with when building circuits with the standard 1/4 watt resistor: Ho...
Saturday, March 30, 2013

How Power and Current are Affected by Resistance

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In keeping with the simple voltage divider theme, let's look at a similar circuit: Here, R1 can be varied from 0Ω to 25Ω. What is ...

Link to Chapter 3 Stuff

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Here's a link to Chapter 3 related stuff: Direct Current Folder

The Meter is Part of the Circuit

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In my last post, I drew a simple voltage divider circuit. Two 6.8 Megohm resistors in series, powered by a 20 volt DC (20 VDC) power suppl...
Thursday, March 28, 2013

Voltage Dividers

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Today we talked about voltage dividers - We used a DC Power supply and some resistors to measure what we built - Here's the voltage ...
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