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Finding the project.
This is part one of two articles.
So how do I start a new project, and how do I decide what to build?
Whenever I come up with an idea, I write it down. I have a long list of "projects to-do". It reaches from a simple LED flasher in the bushes, to a more advanced circuit...
I am currently building an executive toy that is a small 1970's style looking computer (with the exception of the 2 line 16 character display).
The computer has 2K ROM, 8K RAM, hopefully a paper tape reader and several IO ports. Interestingly this computer is easy to adapt and therefore i...
Hello everyone! This is my first blog entry here on All About Circuits. I'll briefly introduce myself (even though I've been active here since Dec 2010).
I'm currently a college juinor at Rensselaer Polytechnic Institute. I'm majoring in Electrical Engineering and I will finally be taking...
An interesting circuit once appeared under this thread:
http://forum.allaboutcircuits.com/showthread.php?t=43005
and I thought I would show how I solved it.
Using just 3 node voltage method equations.
The original problem said: "Find the resistance between points A and B if R=81 Ω...
Hey everyone,
I know, im that bad! This is my FIFTH CPU design. This time, im keeping to kiss (keep it simple stupid). I have spent time designing this one internal bus four bit computer. It has a small number of instructions as listed below:
Add(ab):
Adds the two registers A and B together...
Hi,
This is a continuation of the original squarewave to triangle wave in the series of designing a PWM circuit using all discreet components
http://www.youtube.com/v/KnFV7qTVJB0?hl=en&fs=1
This video shows how the amplified triangle wave is fed into the volt. level detector circuit...
It is easier to explain on the video,
http://www.youtube.com/embed/PmplS1mcFqI
than to write it all out.
The basic idea of designing the inverter is 'sinusoidal pulse width modulation'.
One can get an idea from here.
I have used HEF4752 in this project. It is a 3phase SPWM pulse generator chip. I bought it for 2000 INR. This IC can drive six mosfets/igbts with its complemetary SPWM pulses
This is a quick design of a light tracking circuit,
The video of it:
And
Here is the schematic of it:
it is a test circuit running a 5v. motor, when the light hits the left CDS cell the motor spins leftward, and the right CDS cell causes the motor to spin rightward, when no direct light...
PWM motor speed control, with torque control feedback.
Q6 is the mosfet motor driver.
Q5 delivers positive voltage to the gate of Q6, to cause Q6 to conduct harder so as to drive the motor speed faster.
Q4 and Q5 are the transistors that make up an 'Square Wave Oscillator',
The design of...
Title says everything. There is schematics I lost that can make NO switch to work as NC
Now replacing the two 1.8K ohm resistors, for a single pot. of 5K ohms, and using a current limiting resistor at each base of 100 ohms,
I now have a manual control signal into the base of these PNP transistors to work the circuit.
Built the cuircuit and I get a almost a full range from 0% -...
Designing a PWM unit with manual / electronic speed control.
Hi,
I have been doing some reading up on how 'pulse width modulation' works, and now I feel like I am ready to design my own version of it using all discrete components.
Step 1. Design a 'astable multivibrator circuit' for...
if we have a Transformer having no any label for current rating and voltage rating of primary and secondary winding then how can we calculate ampere and voltage rating of both windings and how can we know that this is a step up or step down transformer?
Hi, i am posting the fullwave center tapped rectifier circuit diagram can any one tell me that how can I calculate Dc voltage which is observed by the RL or load? is there any formula to calculate DC voltage in this type of circuit? secondary voltage here is 6 plus 6 rms and each diode is...
Hi, i am posting the fullwave center tapped rectifier circuit diagram can any one tell me that how can I calculate Dc voltage which is observed by the RL or load? is there any formula to calculate DC voltage in this type of circuit?
By adding a second (D-flip flop), to couple to the first D-flip flop makes it into a (master-slave) flip flop.
I needed to reduce the "NAND" gate pull up resistors from 470K ohms, down to 100K ohms, to keep the outputs more stable, otherwise there was false triggering, due to more components...
Now, next I build a two input "NAND" gate.
No design calculations here, just put it together, and through trial and error, pick the right resistor values, that work properly with the rest of the circuit.
I found that the 100K base resistors works fine for activating the "NAND" gate,
also by...
To make a "data storage circuit" known as a flip flop, it begins with two inverters, coupled back to back, so the output of one feeds the input of the other, and vise versa.
This is a tutorial of how to design a very basic digital circuit for storing data known as a flip flop.
This tutorial...
I finally built that circuit and It works fine.
I thank the forum members which gave me some suggestions:
http://forum.allaboutcircuits.com/showthread.php?t=41760&page=2 (in my last post you can find the right schematic)
http://forum.allaboutcircuits.com/showthread.php?t=41460 (how to...
