Showing posts with label build. Show all posts
Showing posts with label build. Show all posts
Friday, April 12, 2013
Build Intelligent Wire Loop Alarm Circuit With IC
Integrated circuit anti-theft alarm system, wire or different lack of a easy circuit. When the shortage of wires or cords lacking. MOSFET, it's working or has input voltage at pin G and for this reason it has a high current floats in the route of the pin D-S that Micro piezo siren was once so loud.
Part List
R1 100K 1/2W 1% ResistorR2, R4 10K 1/2W 1% Resistor
R3 1 Meg 1/2W 1% Resistor
C1, C3 0.1uF Ceramic Disc Capacitor
C2 0.01uF Ceramic Disc Capacitor
IC1 4001UBE Quad 2-i/p NOR Gate
Q1 MPSA14 Low Power NPN Transistor
SIREN Micro piezo siren 12V DC 150mA, 110dB @ 1M
LOOP See “Notes”
The loop can be any kind of hookup wire, with a most resistance of about 90K. Using very skinny wire (40AWG, for example) will make an awfully sensitive travel wire, but will shorten the distance it will also be strung due to the high resistance.
The siren can be changed with a relay to power external load
Build a Digital Stopwatch 0 60sec
Now Build a Digital Stopwatch 0-60sec By using the same circuit of the Digital Stopwatch 0-99sec , we can add an AND gate, and transform the 0 – 99sec stopwatch to a 0 – 60sec stopwatch.We must find a way to control the RESET function of the BCD counter, which is responsible for the counting of the seconds. As we studied above, the circuit resets when we have 99 to 100, that is 1001 1001 à 0001 0000 0000. To make a transformation successfully we must force the pulse from 59 to 60 0011 1001 à 0100 0000 on the output of the BCD counter.
By placing the AND gate, with its inputs on the Q1 and Q2 of the BCD counter of the decades, we make sure that when the gate closes, the RST input of the BCD counter will be set to logical “1”, which on its turn, will force the circuit to start over. The transformed circuit appears in picture 2.
Saturday, April 6, 2013
Build a LT3582 12 DC 5V to 12V DC Converter
Using LT3582-12 dual channel DC DC converter integrated circuit, manufactured by Linear Technology, can be designed a very simple step up dc converter. This 5 to 12V c converter electronic project provide both positive and negative outputs required in many biasing applications such as active matrix OLED (organic light-emitting diode)displays as well as CCD (charge coupled device) applications.
The LT3582 offer an I2C interface that can dynamically program output voltages, power sequencing and output voltage ramps as the application requires. The LT3582’s positive output voltage can be set between 3.2V and 12.775 in 25mV steps, whereas the negative output can be set between -1.2V and -13.95V in 50mV steps. The LT3582-12 is preconfigured with ±12V output, requiring no future programming.
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