Questions tagged [teaching]
8 questions
8
votes
5 answers
Is is possible to create modular logic gates from transistors for teaching purposes?
I'd like to work through some basic logic circuits with some youngsters and wanted to build them up from scratch (transistors), not logic gates if possible.
We've done the basics: buffer, NOT, AND, OR, NAND, XOR just using NPN mosfets and resistors.…
Dom
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6
votes
1 answer
Is lead color a safety issue?
BNC to alligator clip connectors were made for a function generator in our lab. Whoever made them decided that the ground connector wire should be red and the signal connector wire should be white.
As this is a lab for student teaching, I'm…
Peter K.
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3
votes
2 answers
Analysis of unbalanced bridge circuit
Introduction
I am learning the method of Fast Analytical Circuit Techniques (FACTs), based on the Extra Element Theorem of the late Prof. Middlebrook. In the future, I intend to teach an undergraduate-level course based on these techniques.
I’ve…
swineone
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2
votes
0 answers
Switching power supply output voltage modification gone wrong
A couple years ago, I modified the voltage output of a DC power supply from 12 V to 6 V. I remember using this online calculator to get the proper output voltage (see picture):
Image source: Circuit Easy - TL431 Voltage Calculator
Unfortunately…
vulubalulu balulu
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1
vote
1 answer
A basic description of capacitors - but is it wrong?
I volunteer at a club to teach teens Arduino and basic electronics: LEDs, resistors, voltage, current, etc. I also describe what they do:
Batteries, chargers and other power supplies:
These supply plenty of electrons to make the circuits work.
The…
John Burger
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1
vote
1 answer
How do we explain the voltage doubler operation by analogy?
The idea behind the Greinacher voltage doubler is so clear and intuitive that it can be explained, like any brilliant circuit idea, in a very simple way. I did it yesterday in a similar question where I visualized in a geometrical way the invisible…
Circuit fantasist
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0
votes
2 answers
Electronics take-apart student activity
We're planning a (6th-8th grade) student take-apart day, with small non-functioning items like hair dryers, clock radios, coffee makers, etc. (no microwaves, TVs, monitors.) Even though items have not been in use/plugged in for quite some time, I…
Lydia
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0
votes
1 answer
Is there a commonly used name for a "local ground" or "local common"?
Suppose we have a circuit that measures some external voltage like so:
simulate this circuit – Schematic created using CircuitLab
We will assume that the circuit is powered by batteries, and the circuit is well insulated and isolated from coupling…
Math Keeps Me Busy
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