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Its been a long time since I started testing. At least 6 months. The darn ink never worked :(
I used the tube solder mask repair stuff with the very poor instructions and I was NOT getting anywhere. No matter what I tried, nothing.
Until.....I saw a tub. A small black tub with strange looking...
This thermostat has been in service since January 14, 1980 and has never needed a repair. Even the aluminum electrolytic (capacitor) on the power supply has not failed!
The "real" one drives a triac for the output (short sighted of me to do that.) If you set the hysteresis with any...
It stopped spinning some weeks ago.
The PSU turned very hot.
A lot of dust had accumulated!
But the fan did not spin anymore at all.
I had an idea!
Maybe dust would have made it's way between the magnet and the coils.
I tried to pour some white spirit into the fan, and soon, the fan again...
Rated current
The level of continuous DC current that can be passed through the inductor, this DC current level is based on a maximum temperature rise of the inductor at the maximum rated ambient temperature, the rated current is related to the inductor's ability to minimize the power losses in...
DCR(DC resistance)
The resistance of the inductor winding measured with no alternating current, the DCR is most often minimized in the design of an inductor, the unit of measure is ohms, and it is usually apecified as a maximum rating.
OHM
The unit of measurement for resistance and impedance...
Q value
The Q value of an inductor is a measure of the relative losses in an inductor, the Q is also knows as the "quality factor" and is technically defined as the ratio of inductive reactance to effective resistance and is represented by Q=XL/R=2pifL/R
Since XL and R are functions of...
Number turns
The series impedance of a high frequency ferrite device can be increased by running two or more turns of the treated conductor through the ferrites core, magnetic theory predicts that the impedance of the device will increase with the square of the number of turns, however, due to...
Inductance tolerance
Standard inductance tolerances are typically designated by a tolerance letter, standard inductance tolerance letters include:
F:+/-1%
G:+/-2%
T:+/-3%
J:+/-5%
K:+/-10%
L:+/-15%
M:+/-20%
P:+/-25%
N:+/-30%
Test frequency
The frequency at which inductors are tested for either...
Inductance
The property of a circuit element which tends to oppose any change in the current flowing through it, the inductance for a given inductor is influenced by the core material, core shape and size, the turns count and shape of the coil,inductors most often have their inductances...
Inductor
A passive component designed to resist changes in current,inductors are often referred to as "AC Resistor",the ability to resist changes in current and the ability to store energy in its magnetic field,account for the bulk of the useful properties of inductors,current passing through an...
The CCP module is one of the most important modules in the PIC microcontroller. While being extremely important, it is not very difficult to use. Here I will show you how to use the compare section of the CCP (Compare, Capture, Pulse Width Modulation) module of the PIC16F877A. You can use this...
Hi all.
Thanks for taking the time to help me with the questions to produce the world's first Art of Electronics Answer Guide.
Yay!
I intend to post questions up here. Any which need a schematic or formulae from the book will have that too.
In order to avoid people doing the same...
In most cases where you want to control an AC load, a triac or SCRs will be used. However, it is not easy to drive a triac or SCR. The drive requirement for the triac or SCR makes it sometimes difficult to control it as we want. One thing is that we can not turn the triac or SCR on or off as...
I have finally built an FM transmitter.
Previsouly I have built an AM transmitter but it never worked right, only very short distance.
http://cappels.org/dproj/FMXMTR/fmxmtr.htm
The design is somehow finicky, and does not work like shown. Adjustable resistor for the 330 Ohms, and 1K Ohms are...
This blog entry was inspired by the following thread:
Forward Error Correction Identification
The basic gist is that the Original Poster (OP) had a cheap data module for an RF system that, for some reason, he couldn't disclose the make or model of and he didn't have the documentation on...
Here's one temperature sensor (thermometer) circuit that you can easily build. It uses the popular PIC 16F877A microcontroller. The temperature sensor is LM35. The LM35 outputs an analog voltage proportional to the temperature. The output from the LM35 is 0.1V/'C. So, when temperature sensed...
I have previously shown how to manually calculate the values for the sine table:
http://tahmidmc.blogspot.com/2011/01/generation-and-implementation-of-sine.html
You can use Smart Sine to automatically generate the sine table:
http://forum.allaboutcircuits.com/blog.php?b=508
I have also shown...
I have previously shown how to calculate the values for the sine table. Now I will show you how to use that sine table for generating a sine wave using a PIC16F684. Why PIC16F684? It is a nice little 14-pin PIC that contains all that is needed for SPWM (sinusoidal pulse width modulation) – the...
