AxiomV Security Systems

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My new experience with RBH AxiomV Security System.

AxiomV combines access control, building management, and security monitoring in a highly integrated and expandable system. AxiomV runs on a standard IBM compatible PC using Windows 2000, XP, or 2003 Server and is designed for use in installations ranging from simple two door systems to complex systems covering multiple sites and containing thousands of card readers and tens of thousands of card holders.

TDA 2822 headphone amplifier

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Microphone Amplifier Module

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This circuit based on a very simple single transistor amplifier which can use with any power amplifier. very low noise, 45dB stage gain. Input impedance: 2700 Ohm.


Parts:-

R1______________1M2  1/4W Resistor
R2______________5K6  1/4W Resistor
R3______________1K   1/4W Resistor
C1,C3___________4µ7   63V Electrolytic Capacitors
C2____________100µF   25V Electrolytic Capacitor
Q1____________BC550C  45V 100mA Low noise High gain NPN

ElectroDroid (simple and powerful collection of electronics tools and reference)

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 ElectroDroid is a simple and powerful collection of electronics tools and reference; it includes:

• Resistor color code decoder (3-6 bands);
 • Inductor color code decoder;
 • Ohm’s law calculator;
 • Reactance calculator;
 • Voltage divider;
 • Resistor ratio, value/series/parallel;

ELECTRONIC PUSH BUTTON SWITCH

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When the circuit power is turned on, C1 capacitor charges via the two 470k resistors. When the switch is pressed, the voltage on C1 is passed to directly Q3 to turn it on. This turns on Q1 and the voltage developed across R7 will keep Q1 transistor turned on when the button is released. Q2 is also turned on during this time and it

Important for Electronics in World History

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Inventions In Electronics


1895 : H. A. Lorentz - Postulated existence of Electrons.
1897: J.J. Thomson - Proved the same
1904: Fleming - Vacuum Diode
1906: De. Forest - Triode
1920: Radio Broadcasting in USA
1930: Black and White TV USA
1947: Shockley invented the junction transistor. (BJT)
1947: Schokley BJT Invention
1950: Colour Television