Musical Air Horn for Truck and Car –Free tips tricks

Songs
Nagin Bin, Bana Re Bag Me... , Sandeshe Aate hein... (Film : Border), Odhni Odhu... (Gujarati Song) ,Chotile Dakala Vagya... (Gujarati Song), Apna Mulak Na Mayalu Manvi... (Gujarati Song), Khaike Pan Banaras Vala...

Benefits

Replaces ordinary Air Horn sound to melodies music sound.

Single circuit supports eight different melody sound.

Good hearing quality then normal Air Horn.

Specifications
Circuit operates from 12V DC car/truck battery.

Six 12V DC solenoid control.

Eight switches for input.

Reverse polarity protection.

Any Custom songs available as per user requirements.

Light Flasher Circuit -Naveen P N

This is a very basic circuit for flashing one or more LEDS and also to alternately flash one or more LEDs.

It uses a 555 timer setup as an astable multivibrator with a variable frequency.

With the preset at its max. the flashing rate of the LED is about 1/2 a second. It can be increased by increasing the value of the capacitor from 10uF to a higher value. For example if it is increased to 22uF the flashing rate becomes 1 second.

There is also provision to convert it into an alternating flasher. You just have to connect a LED and a 330ohm as shown in Fig.2 to the points X and Y of Fig.1. Then both the LEDs flash alternately.

Since the 555 can supply or sink in upto 200mA of current, you can connect upto about 18 LEDS in parallel both for the flasher and alternating flasher (that makes a total of 36 LEDs for alternating flasher).

Light Flasher Circuit -Naveen P N

This is a very basic circuit for flashing one or more LEDS and also to alternately flash one or more LEDs.

It uses a 555 timer setup as an astable multivibrator with a variable frequency.

With the preset at its max. the flashing rate of the LED is about 1/2 a second. It can be increased by increasing the value of the capacitor from 10uF to a higher value. For example if it is increased to 22uF the flashing rate becomes 1 second.

There is also provision to convert it into an alternating flasher. You just have to connect a LED and a 330ohm as shown in Fig.2 to the points X and Y of Fig.1. Then both the LEDs flash alternately.

Since the 555 can supply or sink in upto 200mA of current, you can connect upto about 18 LEDS in parallel both for the flasher and alternating flasher (that makes a total of 36 LEDs for alternating flasher).

Electronic Scoring Game- A special collection

You can play this game alone or with your friends. The circuit comprises a timer IC, two decade counters and a display driver along with a 7-segment display. The game is simple. As stated above, it is a scoring game and the competitor who scores 100 points rapidly (in short steps) is the winner. For scoring, one has the option of pressing either switch S2 or S3. Switch S2, when pressed, makes the counter count in the forward direction, while switch S3 helps to count downwards. Before starting a fresh game, and for that matter even a fresh move, you must press switch S1 to reset the circuit. Thereafter, press any of the two switches, i.e. S2 or S3. On pressing switch S2 or S3, the counter�s BCD outputs change very rapidly and when you release the switch, the last number remains latched at the output of IC2. The latched BCD number is input to BCD to 7-segment decoder/driver IC3 which drives a common-anode display DIS1. However, you can read this number only when you press switch S4. The sequence of operations for playing the game between, say two players �X� and �Y�, is summarised below:

1. Player �X� starts by momentary pressing of reset switch S1 followed by pressing and releasing of either switch S2 or S3. Thereafter he presses switch S4 to read the display (score) and notes down this number (say X1) manually.

2. Player �Y� also starts by momentary pressing of switch S1 followed by pressing of switch S2 or S3 and then notes down his score (say Y1), after pressing switch S4, exactly in the same fashion as done by the first player.

3. Player �X� again presses switch S1 and repeats the steps shown in step 1 above and notes down his new score (say, X2). He adds up this score to his previous score. The same procedure is repeated by player �Y� in his turn.

4. The game carries on until the score attained by one of the two players totals up to or exceeds 100, to be declared as the winner.

Several players can participate in this game, with each getting a chance to score during his own turn. The assembly can be done using a multipurpose board. Fix the display (LEDs and 7-segment display) on top of the cabinet along with the three switches. The supply voltage for the circuit is 5V

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JAM (Just a Minute) Circuit- A special funny Circuit

This jam circuit can be used in quiz contests wherein any par- tic pant who presses his button (switch) before the other contestants, gets the first chance to answer a question. The circuit given here permits up to eight contestants with each one allotted a distinct number (1 to 8). The display will show the number of the contestant pressing his button before the others. Simultaneously, a buzzer will also sound. Both, the display as well as the buzzer have to be reset manually using a common reset switch. Initially, when reset switch S9 is momentarily pressed and released, all outputs of 74LS373 (IC1) transparent latch go �high� since all the input data lines are returned to Vcc via resistors R1 through R8. All eight outputs of IC1 are connected to inputs of priority encoder 74LS147 (IC2) as well as 8-input NAND gate 74LS30 (IC3). The output of IC3 thus becomes logic 0 which, after inversion by NAND gate N2, is applied to latch-enable pin 11 of IC1. With all input pins of IC2 being logic 1, its BCD output is 0000, which is applied to 7-segment decoder/driver 74LS47 (IC6) after inversion by hex inverter gates inside 74LS04 (IC5). Thus, on reset the display shows 0. When any one of the push-to-on switches�S1 through S8�is pressed, the corresponding output line of IC1 is latched at logic 0 level and the display indicates the number associated with the specific switch. At the same time, output pin 8 of IC3 becomes high, which causes outputs of both gates N1 and N2 to go to logic 0 state. Logic 0 output of gate N2 inhibits IC1, and thus pressing of any other switch S1 through S8 has no effect. Thus, the contestant who presses his switch first, jams the display to show only his number. In the unlikely event of simultaneous pressing (within few nano-seconds difference) of more than one switch, the higher priority number (switch no.) will be displayed. Simultaneously, the logic 0 output of gate N1 drives the buzzer via pnp transistor BC158 (T1). The buzzer as well the display can be reset (to show 0) by momentary pressing of reset switch S9 so that next round may start. Lab Note: The original circuit sent by the author has been modified as it did not jam the display, and a higher number switch (higher priority), even when pressed later, was able to change the displayed number.

Here is full description about this circuit

 This simple and inexpensive circuit built around a popular CMOS hex inverter IC CD4069UB offers four sequential switching outputs that may be used to control 200 LEDs (50 LEDs per channel), driven directly from mains supply. Input supply of 230V AC is rectified by the bridge rectifiers D1 to D4. After full wave rectification, the average output voltage of about 6 volts is obtained across the filter comprising capacitor C1 and resistor R5. This supply energy IC CD4069UB.

All gates (N1-N6) of the inverter have been utilised here. Gates N1 to N4 have been used to control four high voltage transistors T1 to T4 (2N3440 or 2N3439) which in turn drive four channels of 50 LEDs each through current limiting resistors of 10-kilo-o Base drive of transistors can be adjusted with the help of 10-kilo-ohm pots provided in their paths. Remaining two gates (N5 and N6) form a low frequency oscillator. The frequency of this oscillator can be changed through pot VR1. When pot VR1 is adjusted To get the best results, a low leakage, good quality capacitor must be used for the timing capacitor C2

A Funny TV remote control Blocker

Just point this small device at the TV and the remote gets jammed .   The circuit is self explanatory . 555 is wired as an actable multi-vibrator for a frequency of nearly 38 kHz. This is the frequency at which most of the modern TVs receive the IR beam . The transistor acts as a current source supplying roughly 25mA to the infra red LEDs. To increase the range of the circuit simply decrease the value of the 180 ohm resistor to not less than 100 ohm.
It is required to adjust the 10K potentiometer while pointing the device at your TV to block the IR rays from the remote. This can be done by trial and error until the remote no longer responds. 

TEA MAKER – HOW MAKE TEA IN A MOMENT

features
Stanless Steel Structure

ABS Moulded Body

User Adjustable Powder & Water Setting

Half Cup / Full Cup

Flushing Function

Cup Counter

Hot Water & Normal Water Options

Sleek Aesthetic Design

Storage Tank with Float Valve

Automatic Temp Control

Portable & Light (Only 8 kg)

Technical Specifications
cannister capacity : 1 kg

number of options : 2 lane

dispensing speed : 3 cups/min

net weight : 8 kg

power : 1100 watts

voltage : 220v / 50hz

dimensions : 332 x 355 x 585mm

Infrared Remote Switch for Light and Fan – Free tips tricks

Features

Controls 5 - Lamp and 2 - Fan

Fan speed regulation from 0 to 7 Eight steps.

Light and Fan On/Off Indication.                                     

Built in memory.

Full function remote control.

Reduce your electricity bill by putting off lights & fans immediately with remote control, when not needed.

Benefits

Total shock proof (we need not to touch the switch board as it operates with remote control).

Energy saving (reduce your energy bill by putting off lights, fans etc. with remote control when not needed).

No need to change existing wiring.

No need for two way wiring (saving in two way wiring cost).

Operate through remote control as well as from main unit manually.

Specifications

Operating voltage 180-250 volts AC.

Frequency 50 Hz.

Load capacity each switch (225 watt).

I/R based remote control.

Remote control working range up to 40 Ft. (Depending upon batteries conditions).

Use two “AA” batteries for remote control.