Diferite

Game Circuit Sounds from the IC IT82207  Crossed from: Inside Circuits | Clicks: 18665 | Votes: 2 | Comments: 0 | Rating: 7.5 | Rank: 2 This circuit is able to take you to the world of the Wild West. For this it uses the integrated 18-pin IT82207 (IC1) of Holtek, which literally takes care of everything. You have to do is add a few accessories, including a loudspeaker and six selector switches. .. Ultrasonic Bat reciever Crossed from: Inside Circuits | Clicks: 224 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 ??? won't be disappointed with the performance of this sensitive ultrasonic receiver. It can let you listen to bugs, bats, engines, and virtually any other source of ultrasonic sounds. The circuit uses a piezo tweeter as an ultrasonic microphone, amplifier stages Ql, Q2, and an LO using a 567 IC. Q3 is a mixer that heterodynes the ultrasonic sounds down to the audible range. U2 is an amplifier that will drive a pair of headphones. .. Detection for trains on model railway | Clicks: 19723 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 This light valve can be used for example to detect trains on model railway or a lap counter at the close racing. D3 receives a constant stream of power built around T1. When the light beam from D3 to T3 is not interrupted, led T3 and T2 is the basis of practically grounded. T2 not conduct and the LED is not lit. When the beam is interrupted, spert T3 and T2 conducts and the LED will light. Of course listen to other things like LED control between plus and the collector of T2. Please note the maximum load of 100 mA. The supply voltage may be between 4.5 and 12 volts... Toy Train rail detector circuit II | Clicks: 12784 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 This circuit can detect whether a train in a particular drive. The output is TTL and CMOS compatible and can be processed by such a computer. The simple circuit works. The driving voltage is connected to the two terminals left. When the locomotive of the interrupted line is, the flow leading to the locomotive goes through the triac T1. This is then a voltage of about 1 V, which is conducting T3 or T4. Therefore, the LED D1 on and the output is logical zero. .. Toy Train rail detector circuit | Clicks: 13549 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 This circuit must be used between the drive voltage of such a transformer and track. On JP1, the transformer is connected to JP2, the rails are connected to JP3, is a TTL "High" position when there is a tax on the trail is more of 2mA, but given the average LED more consumption, this should not be a problem. Works through a circuit voltage of 1.4 volts over the diodes, which are anti-parallel so that the circuit in both directions to use. .. Fading LEDs schematic Crossed from: Led circuits | Clicks: 12248 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 This circuit is used to slowly illuminate and fade a pair of red LEDs (light emitting diodes). The fading LEDs could be installed as 'eyes' in a small pumpkin or skull as a Halloween attraction, or mounted in a Christmas tree ornament. Or, they might be used as a fancy power indicator for your computer, microwave oven, stereo system, TV, or other appliance. In operation, a linear 3 volt (peak to peak) ramping waveform is generated at pin 1 of the LM1458 IC and buffered with an emitter follower transistor stage. The 22uF capacitor and 47K resistor connected to pin 2 establish the frequency which is about 0.5 Hz. .. Who's First" game lights | Clicks: 11762 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 The circuit below turns on a light corresponding to the first of several buttons pressed in a "Who's First" game. Three stages are shown but the circuit can be extended to include any number of buttons and lamps. Three SCRs (silicon controlled rectifiers) are connected with a common cathode resistor (50 ohm) so that when any SCR conducts, the voltage on the cathodes will rise about 7 volts above the voltage at the junction of the 51K and 1K ohm resistors and prevent triggering of a second SCR. When all lamps are off, and a button is pressed, the corresponding SCR is triggered due to the voltage at the divider junction being higher than the cathode. .. Racing Finish Line Lamps circuit Crossed from: Lighting | Clicks: 6887 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 The finish line circuit below detects the first of three cars to cross the line and illuminates a 25 watt 120 VAC lamp indicating the winning lane. Three photo transistors are used which can be embedded into the track with a light shining down onto the finish line so that as the car crosses over the sensor, the light is blocked, activating the relay and lighting the lamp for the appropriate track. The light source should be an incandescent type, florescent lights may not work due to low infra-red content. The circuit was tested using a 100 watt incandescent light fixture about 3 feet above the photo transistors... Flashing LEDs toy with 555 Crossed from: Led circuits | Clicks: 11769 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 There have described the involvement benefited LM3909 circuit, which is quite expensive. That's why I prefer to use a much cheaper known timer 555th.Involvement of the tree is a very simple scheme is to figure 2 . It is based on several multivibrator used as a favorite flasher timer 555 in the simplest possible involvement. Each flasher controls six light emitting diodes, of which only D3 and D6 are on the same PCB. The signal output from the IC (pin 3) is fed through resistor R1 to capacitor C1. When power to the IC output voltage appears to be approaching the positive supply voltage. .. LED Traffic Lights for Games | Clicks: 6209 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 This schematic uses the 555 timer and the 4017 IC to drive 3 LED, to simulate the trafic lights... LED flashing circuit for toys Crossed from: Led circuits | Clicks: 14808 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 It consists of a 4047 low-power monostable/astable multivibrator, IC1, used in the astable mode to provide the timing pulses to control the flash rate of the LEDs. To accomplish the astable mode, pins 4, 5, 6, and 14 are connected to +12VDC and pins 7, 8, 9, and 12 are connected to ground. Pins 1 and 3 are connected to C2 and pins 2 and 3 are connected to potentiometer R9. A fixed value resistor can be used in place of the potentiometer R9, if the flash rate does not need to be adjusted. These three pins make up the R-C timing circuit. The output pulses from the 4047 are taken from pins 10, 11, and 13. Pin 10 is the Q output and pin 11 is the Q-not output. These two pins are onnected to R6 and R7 respectively... Electronic Dice schematic | Clicks: 10684 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 An electronic dice is a classic first project for those getting interested in electronics. A timer, counter and a few LEDs makes a circuit that can also add a new twist to some old boring board games. When the switch is pressed, a 555 timer in astable mode pulses a BCD counter which lights up a series of LEDs wired to mimic a dice. Two AND gates are used to reset the count back to one whenever the BCD output is seven. Thus, the circuit is not truly random but the natural bounce present in a pushbutton and the normal human ability to operate much slower then the oscillator make the output of the circuit seem random... Electromagnetic Levitator | Clicks: 17144 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 This circuit creates a stunning display of the "magic" of magnetism by suspending a small metal object in mid air. Using an electromagnet, photo sensor and closed loop control, small and light metal objects can be floated just underneath the magnet, enclosed in a decorative arch. "No strings" are easily demonstrated by the ability to pick the metal object out of the air and place it back under the magnet at will. With the object floating about 1/4" under the magnet (exact distance will depend on the weight of the object), an LED and photo transistor arrangement let a feedback circuit know it's position. .. Quiz game schematic | Clicks: 3146 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 This jam circuit can be used in quiz contests wherein any par- ticipant 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... Scoring Game circuit | Clicks: 11298 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 0 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 counters BCD outputs change very rapidly and when you release the switch, the last number remains latched at the output of IC2...