Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Topics - Lazarus

Pages: [1]
1
Electronic connection / Discussion thread for: AC 101: Rectifiers
« on: January 27, 2016, 07:35:25 AM »
lets talk about rectifiers:

:)

2
Electronic connection / AC 101: Rectifiers
« on: January 27, 2016, 06:55:00 AM »
this is a half wave rectifier, to make the output negative, just turn the diode and cap around reversed,

this is an animated graphic, it updates every 2 seconds,


3
lets Talk about voltage doublers and voltage multipliers,

:)

4
Electronic connection / AC 101: Voltage Doublers & Voltage Multipliers
« on: January 27, 2016, 05:12:49 AM »
this is a half wave voltage doubler,

if you want the polarity to be reversed, all you gotta do is turn the diodes around in the opposite direction, then the output will be negative instead of positive, and of coarse if the caps happen to be polarized then they will need to be turned around in the opposite polariry,

other than that, i think the animated graphic pretty much says it all, it updates every 2 seconds,



Note: i'm only doing this in my spare time, so check back from time to time for updates, i plan to add some scope pics to this when i get time,

up next: full wave voltage doubler,

:)

5
lets talk about transistors,

:)

6
Electronic connection / Bipolar Junction Transistors "BJT"
« on: January 02, 2015, 09:15:05 PM »
This is a work in progress, and as such is subject to change, so i will be editing this post as i think of more detail and better ways of presenting it, but if i'm gonna do this then i've got to start somewhere, so for now here goes,

How it Works:

as illustrated in the figure below of an NPN transistor, if we apply a small amount of base current it will cause a much larger amount of collector current to flow, this is how a transistor is able to amplify a signal, and the ratio of base to collector current is called the current gain, symbolized by the greek letter beta "β", the current gain is also sometimes called "Hfe",

in the example below, lets assume that we have a base current of 1 milliamp, and a collector current of 100 milliamps, the ratio would be 100:1 so the current gain of this transistor would be 100, so in this case β = 100, here's the formula:

β = Ic / Ib

where:
β = current gain
Ic = collector current
Ib = base current

ok now lets apply 2 milliamps base current, with a current gain of 100 that would yield a collector current of 200 milliamps,

so now it can be seen how it is able to amplify a signal, because that a small amount of base current causes a much larger amount of collector current to flow, just a 1 milliamp increase in base current caused a 100 milliamp increase in collector current,



β = Ic/Ib

Vcc = Collector Supply Voltage
Vbb = Base Bias Supply Voltage
Ib = Base Current
Ic = Collector Current
Ie = Emitter Current
Vbe = Base Emitter Voltage, or Voltage measured across the Base and Emitter
Vce = Collector Emitter Voltage, or Voltage measured across the Collector and Emitter
Vcb = Collector Base Voltage, or Voltage measured across the Collector and Base
Rb = Base Bias Resistor, used to limit the base current
RL = Load Resistor, used to limit the collector current
β = Current Gain, or HFE

7
This thread is for discussing the topics raised in the: Digital 101, Logic Gates thread, i am keeping that thread locked to keep it neat and orderly,

:)

8
Electronic connection / Digital 101: Logic Gates
« on: December 16, 2014, 04:59:23 PM »
The Buffer,

A buffer is often used in digital logic to condition a signal, and also to buffer a signal up to the level needed to drive the next stage, basically you can think of it as simply a hopped up amplifier who's output is either all the way ON or completely OFF,



Discussion area for this thread is found here: http://gokarters.com/smf/index.php?topic=2439.0

9
This thread is for discussing the topics raised in the: Digital 101, digital numbering systems, thread, i am keeping that thread locked to keep it neat and orderly,

:)

10
Electronic connection / Digital 101, digital numbering systems,
« on: December 14, 2014, 04:12:32 PM »
Digital numbering systems,

in Digital electronics, one of the first things one needs to understand is the numbering systems used, so in this thread I will briefly explain a few of them,

one numbering system that we all should be familiar with is called decimal, I think we all know how the decimal numbering system works, but for reference and just to be thorough i'm going to cover it anyway,

Decimal:
in decimal a single digit can represent one of 10 possible values beginning with 0 and ending with 9, the first digit advances from 0 through 9 before the next digit advances, this is called base 10, or decimal, here is an example using 2 digits,

00
01
02
03
04
05
06
07
08
09
10

up next: Binary,

Discussion area for this thread is here: http://gokarters.com/smf/index.php?topic=2437.0

11
How CB radio works / EPT-3600-xxx channel code/Binary Adder Chip info
« on: October 28, 2014, 01:02:55 PM »
i hope you don't mind Buddy, but for some reason CBT will not let me post this pic, so i'm gonna post it here and link to it from there,

:)

12
Antennas and Towers / 4 bay bowtie collinear UHF TV antenna
« on: June 26, 2012, 05:40:22 PM »
i didn't know where to put this, i think some folks will find it interesting, my brother and I have been building this antenna for several years now, according to my tests it yields a gain of approx 22 db, the elements and phasing network is #10 AWG aluminium rigid wire, other than that i think the details in the pic should cover pretty much everything, but feel free to ask whatever about it,


13
How CB radio works / Controlled Carrier Stuff
« on: June 08, 2012, 06:46:51 AM »
building the 1Khz modulator for the signal gen inspired me to do this, well kind of, i already had it on my mind, but i guess it gave me the incentive to go ahead with it, lol


14
How CB radio works / 29-LTD signal gen stuff
« on: June 01, 2012, 01:34:56 AM »
test

ok i think i've got this figured out now

15
New member welcome / howdy
« on: May 31, 2012, 08:05:06 AM »
welp i made it, good mornin' folks, :)

Pages: [1]