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Friday, 19 September 2014

Simple Inverse Scalier Circuit Diagram

Simple Inverse Scalier Circuit Diagram. If a DAC is operated in the feedback loop of an operational amplifier, then the amplifier gain is inversely proportional to the input digital number or code to the DAC.The version giving scaling inversely proportional to positive voltage is shown.

Simple Inverse Scalier Circuit Diagram

Wednesday, 29 May 2013

Simple delay circuit Diagram

This is simple delay circuit.When you change the value of cap the time delay will be changed.I suppose beginners can learn a lot from this circuit and this circuit gives you to build or fix new circuits.

Note

# This circuit can be operated with 4.5V power supply

Sunday, 26 May 2013

Simple Audio Amp Circuit

This is an audio amplifier circuit.Here we have used femous Ic 741 as the pre amplifier.Ic 386 acts here as the Power amp.R3 resistor controls the volume.R2 contralls the gain.

Note

# This circuit operates with 9V

# Use 8ohm speaker for this

Sunday, 19 May 2013

Simple Digital Security System

You can use this simple and reliable
security system as a watchdog
by installing the sensing
loops around your building. You have
to stretch the loop wires two feet above
the ground to sense the unauthorised
entry into your premises.
Wire loops 1, 2 and 4 are connected
to the A, B and C inputs of 7-segment
decoder 4511 (IC1), respectively, while
the D input of IC1 is grounded permanently.
The loops are also connected to
a dual 3-input NOR gate and inverter
CD4000 (IC2) to activate the alarm.

Fig. 1 shows the circuit of the digital
security system, while Fig. 2 shows
the proposed wiring diagram for the
loops around the premises. Before using
this security system, make sure
that loops shown in Fig. 2 are con-
�� PHERDAUS ISLAM nected as shown in Fig. 1. If you don’t
want to use a buzzer, switch it off by
opening switch S2.
The circuit works off a 9V regulated
power supply. However, battery
back-up is recommended. A commoncathode,
7-segment display (LTS543)
is used for displaying whether the
loops are intact or not.
If loop 1 is broken, the display will
show ‘1’. If two or all the three loops
are broken, the display will show the
sum of the respective broken loop

Sunday, 5 May 2013

Simple Phono Preamplifier

In recent years, following CDs introduction, vinyl recordings are almost disappeared. Nevertheless, a phono preamplifier is still useful for listening old vinyl discs from a well preserved collection. This simple but efficient circuit devised for cheap moving-magnet cartridges, can be used in connection with the audio power amplifiers shown in these web pages, featuring low noise, good RIAA frequency response curve, low distortion and good high frequency transients behavior due to passive equalization in the 1 to 20 KHz range.

Circuit Diagram:

Parts:

R1 = 47K
R2 = 100R
R2 = 6.8K
R4 = 68K
R5 = 2.7K-1/2W
R6 = 2.7K-1/2W
R7 = 2.2K
R8 = 39K
C1 = 100uF-25V
C2 = 100uF-25V
C3 = 100uF-25V
C4 = 47nF-63V
C5 = 47nF-63V
D1 = BZX79C18
D2 = BZX79C18
Q1 = BC337
Q2 = BC327
J1 = RCA Jack
IC1 = LM833, Opamp

Notes:

R2, R3, R4, R7, R8, C4 & C5 should be low tolerance types.
Schematic shows left channel and power supply.
For stereo operation R1, R2, R3, R4, R7, R8; J1; C1, C4 & C5 must be doubled.
Numbers in parentheses show IC1 right channe

Friday, 12 April 2013

Simple Audio Power Meter Circuit

This simple circuit indicates the quantity of energy that goes to a loudspeaker. The dual-color LED presentations green at an applied energy degree of about 1 watt. At 1.5 watts it glows orange and above three watts it is vivid crimson. The circuit is attached in parallel with the loudspeaker connections and that is energyed from the audio signal. The further load that this characterizes is 470 Ohm (R1//R3) will no longer be a problem for any amplifier. During the positive 1 of 2 cycle of the output sign the inexperienced LED in the dual-color LED will probably be turned on, supplied the voltage is sufficiently excessive.

At better output voltages, T1 (depending on the voltage divider R2/R1) can begin to conduct and the fairway LED will go out. During the terrible half of cycle the red LED is driven by the use of R3 and can activate when the voltage is high enough. In the transition area (where T1 habitss extra and extra and ‘throttles’ the golf inexperienced LED as a result) the combination of red/green provides the orange colour of the dual-LED. By selecting appropriate prices for the resistors the facility stages will additionally be adjusted to suit.

Circuit diagram:

$\"simple-audio-power-meter-circuit-diagram1\"$ Audio Power Meter Circuit Diagram

The worths chosen here are for conventional lounge use. You will almost definitely be stunned at how loud you have to turn your amplifier up ahead of you get the LEDs to go! The resistors can be zero.25 W sorts, supplied the amplifier does now not ship greater than forty W constantly. Above this energy the transistor may not be that happy both, so watch out for that too. Because T1 is utilized in saturation, the gain (Hfe) is on no account important and any equivalent type can be used. The power degrees talked about are valid for 4-Ohm audio system. For 8-Ohm audio system the entire resistor values have to be divided by using two.

Simple Shadow Detector Alarm

This is also known as Sun up alarm, in this circuit you can set the LDR’s sensitivity by 100k potentiometer, you can set it with any lamp around your room (tube light, bulb, LED etc) by varrying the 100k potentiometer. We can also control the buzzer time by 1M potentiometer

You can Enhance this project and set the sensitivity of the LDR with a lazer light and keep it on the way of any door circuit at one side and lazer at other side of the door and a then you can make this project to buzz as soon as some one enters in a room

I personally set this project in my room with sensitivity of tube light and whenever i came in and turn my room’s tube light on

rookieelectronics

Parts Required:

100k & 1M potentiometers
10k, 1Mx(3), 47k
0.1mF, 0.01mF & 10mF
LDR
BC337 transistor
Beeper/Buzzer
9v Battery Supply

Circuit Diagram:

Shadow Detector Alarm(Rookie Electronics)

Thursday, 11 April 2013

Simple Fluorescent Light Wiring Diagram Tube Light Circuit

The wiring process of fluorescent tube lamp/light with Ballast,Starter is quite easy and simple. In most cases when we buy a fluorescent light it comes in a complete set with all wire connected. If you want do it yourself , you can buy all the parts individually. And you can complete all connection of the fluorescent light/lamp with the help of this wiring circuit diagram.

Main parts of Fluorescent Tube Light:

1.Fluorescent Tube

2.Ballast

3.Starter

4.Holder, wire etc.

How Fluorescent Lights works:

The starter is like a key of fluorescent light because it is used to light up the tube. When we connect the AC supply voltage to the circuit, then the starter act like short circuited and current flow through those filament (located at the first and second end of the tube light) and the filament generate heat and it ionized the gas (mercury vapor) in the fluorescent tube lamp. So the gas becomes electrically conductive medium. At the same time when the starter opened the circuit path of two filaments from series connected, then the ballast release its stored voltage. And it makes the fluorescent tube fully lighten. Now the starter has no job in the circuit, if you open it from the circuit the fluorescent tube light will be still lighten, until you release the main supply.