Top Circuits Page 76
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Another is the use of money when NE55S delay lamp circuit group circuit, SB1, SH2 are J-light button, can be installed in two different places, the lamp can be operated E. Pres..
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Another method uses Zhu gall thyristor delay lamp circuit. Usually, 220V AC via vr), vs, (,, c: isoelectric consisting of step-down voltage half-wave rectifier circuit, in f st..
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Another setback law sound and light control delay walkway stairs light switch circuit. VDl - VI) 1, off + VT5 constitute Ji - Ji Guan road called Route VTl- VT4 control with ot..
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Another simple connection delay lamp circuit. Turn on the lights, press F SH, power supply by SH, VD. The capacitor (rapid charging, thyristor VT opened, lamp E lights up. Loos..
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As of control rechargeable delay circuit Under normal circumstances, when there is no input signal, the transistor VTi off. VTz conduction, the output U. Low potential. When U...
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As one of the thyristor type delay circuit The so-called cut-off delay, that is, after a period of delay after the closure of the thyristor. The delay time of the circuit withi..
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As shown having a multi-stage delay circuit is output. The operational amplifier circuit used as comparators, operational amplifier A1 when the applied voltage-inverting input ..
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As shown in FIG touch delay switch is a CMOS NAND gate composition, can delay about 10 seconds, often used in street corridor, home door lights automatic control. ..
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As shown in Fig division factor is optional delay circuit. Circuit consists of two 7-bit binary serial counter CC4024, controlled pulse source (gate 1, 2 composition) and the i..
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As shown in the circuit with a set of sound and light control touch three functions into one to form a fully functional delay section light switch circuit as shown in FIG. Part..
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As shown in the telephone table lamp, night ringing or when off-hook light will automatically light up, hang up after delay 45s lamp self-extinguish. Normally used for general ..
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As shown mainly by the touch-delay switch one pair of D flip-flop CD4013 composed, it can be used in some machines power switch, delay switch is also used as lighting, it also ..
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Battery-powered light control delay lighting a small lamp, a sudden power outage or night to ask a blown fuse, the room was dark, it is difficult to find a match and candles: S..
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Bedside door fixture delay circuit has a simple structure, the advantages of affordable, the circuit with a hex inverter CD4069 composition. ..
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But can not speak can be a good sound, light control stairs walkway lighting cast into the confirmation, this circuit has a high immunity under Tuo can, and indeed the soft-sta..
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By inverter Gl, delay and width morning circuit 02 (CD4069) and RC integrating circuit configuration shown. When not gate output high when OI, C capacitor through Rl, D charge,..
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By using a modified piezoelectric ceramics ashamed acoustic-electric transducer sound, light twist stairs walkway delay delayed lighting switch, circuit structure was relativel..
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CD4069 is a digital integrated circuit fabrication using boron to delay light touch, it also uses j -wire connection force method, it can directly replace ordinary light switch..
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Circuit The figure is sound, light, touch control delay self-extinguishing switch three electrical schematic diagram of the circuit from the power circuit, the signal conversio..
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Circuit shown in Figure 2-48. Circle 2-48 (a) using 4.5V battery powered; Fig. 2-48 (b) AC capacitors drop voltage supply. Figure 2-48 (a) the delay time is determined by R3, R..
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Circuit shown in Figure 2-49. The circuit is very simple, cold PTC thermistor element, jump characteristic thermal resistance of the lamp to control delay time. Usually the del..
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An alternative approach for this application takes advantage of low-offset op-amp characteristics to design a circuit that works with a wide voltage range and needs no other supply. The V+ and inverting and noninverting terminals of the OP07 op amp need a....
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The circuit in Figure 1 provides a way to check a battery`s condition. Measuring a battery`s voltage is not the best way to check its condition; it`s better to measure the power that the battery delivers in a discharge process to evaluate the battery`s....
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The 12 Volt power in my application comes from a small solar power system, it may also be provided by a suitable wall-wart DC power supply. The cistern is located below the toilet tank, the pump moves the water up to the toilet`s tank. The pump is switched....
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Half of the effort in this project was to achieve the original timing. When I removed the old coils from the stator poles, I concluded that the timing signal was coming from this pole. The coil that was on this pole had many turns of very fine wire, hardly....
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UGN-3501T Hall sensor due to the composition of the counter circuit diagram UGN-3501T has a high sensitivity, it can feel very small magnetic..
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As illustrated, is the use of an integrated Hall element AC motor off circuit, which is a magnet and other magnetic objects close to the Hall IC element of the induction motor ..
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As illustrated, is the use of integrated Hall element DN6839 dividing circuit. Circuit, the magnetic field detected by pulsating DN6839 whereby the pulse waveform, then the pul..
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No description available...
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Halloween is coming up and it's time to do some pranks. Everyone likes Halloween and I'm no exception. Every year me and my wife decorate the house with lot's of bugs, spider webs, creepy posters and of course lot's of Halloween candy. While making the....
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The Hand Steadiness Tester is a game which tests the steadiness of your hand. The player has to take the ring from one end to another end without touching it to the wire. In this the player gets 4 turns. If the player touches the wire 4 times he has to reset....
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1. Pressing `Roll` switch. When the switch is turned on T1
is turned off (its base is pulled high by the 3M3) and the
555 oscillator is not oscillating. Pressing the ROLL
switch immediately charges the 470nF capacitor, T1 is
turned ON and the 555 starts....
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Everybody likes re-discovering something they did years ago. Here`s a game we all played at school. Possibly under the name of HANG THE BUTCHER. The game is quite simple. One player thinks of a word and writes down the number of letters in that word in the....
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The operation of the circuit is fairly simple. Three AND logic gates of a 4081 CMOS IC are employed, with gates IC1a to IC1c being configured as a standard cascaded latch circuit. S1 to S3 serve as reset switches. The output at pin 10 will only switch to....
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This project has two advantages over previous dice circuits. It produces a realistic readout as well as a `slow-down` feature.
These combine to make it one of our most popular games projects.
As can been seen in the photo, the 7 LEDs are positioned on the....
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The name of our game, LED Zeppelin, is a play on words. It comes not from the pop group of the same name but from Graf Von Zeppelin, a German who invented the first rigid air ship in 1900.
The association fits perfectly. The game consists of six LEDs and an....
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This project is a real winner in more ways than one. When you understand how the circuit works, it is really 4 projects in one. And it has two modes of operation: MANUAL and AUTOMATIC.
Everyone likes a little flutter. The introduction of so many outlets in....
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The most amazing thing about this project is the small number of parts. My boss joked that it involves 17 cents worth of parts and 1000 dollars worth of programming. But don`t worry -- the code is free to you! That means you can build this TV pong game in a....
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This project is not to introduce Tic Tac Toe. Everyone knows this game.
It`s to introduce two features. Bi-coloured LEDs, microcontrollers and the skill of writing an ALGORITHM.
You can use the project to learn the skills of creating the Tic Tac Toe....
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If 12V relays are used, you can replace the 180R resistors R7,R9,R14,R16,R20,R22,R26 and R28 with a wire link (the resistors are only there to limit current if you use 5V relays, of which I had a load in my parts bin). If the system doesn't reset cleanly on....
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The PC board has been designed to accept either a PIC16F84A or PIC16F628. With the introduction of the`628 to the world market, it has taken over from the PIC16F84A and we will be ceasing to design projects for the `F84 and concentrating on the cheaper....
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The simple circuit of Fig.1 emulates a similar conjuring trick which sells for hundreds of Pounds. The trick seems to do the almost-impossible from an electronic point of view, let alone from the point of view of common sense.
It consists of a bank of....
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The circuits in Figure 1 have certain advantages over those in a previous Design Idea (Reference 1). The first-event detector with autoreset (Figure 1a) consists of N sets of monostable multivibrators, using 4001 logic circuits with LEDs attached. After any....
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The arc welder simulator is made up from several functional blocks: five oscillators, two gates and the output driver.
IC1A, IC1B and IC1C are all wired as square wave oscillators, each operating at a different frequency under 100 Hz. This output is a pulse....
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This documents ties to clear out one method for connecting Sega 3D glasses to PC serial port for cheap PC virtual reality. This who do no not know what those Sega 3D glasses are. Sega designed special glasses for it`s video game console to be able to produce....
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The design uses tactile sense (or rather, neural sense) to reveal the contents of a box. The box contains 4 shapes, as in a child`s shape sorter. The conjurer asks a person to secretly remove from the box any shape or shapes of his or her choosing, then to....
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This design was developed by request of a correspondent having made a sort of LED candle and needing to switch off the LED with a puff.
This simple, easy to build gadget can be useful as a prop for Halloween and Christmas season, shows and the like...
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This circuit was designed to provide that continuous light lamps already wired into a circuit, become flashing. Simply insert the circuit between existing lamp and negative supply.
Especially suited for car or panel pilot lights, this device can drive lamps....
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Upon opening your fridge door the photocell is exposed to light and the piggy oinks. Reverse engineered circuit diagram is of an early commercial design which uses an OP-AMP to make simulated pig sounds. Modern Fridge Pigs sound much better because they....
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This box is a set of nine relaxation oscillators. It blinks random patterns and looks cool. When the voltage on the capacitors charge to 65 volts, the neon gas ionizes and discharges the capacitors to 55 volts. The frequency can be simply calculated from the....
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This simple CPO is for those who want to practice Morse Code in a different way, ie with out the morse key. It can be also used as a touch operated door bell. The popular timer IC555 is wired as astable multivibrator. The frequency (tone) can be changed by....
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Morse Tutor is a program written in C++. It can be used for learning or sending morse code. Morse code uses long (dash) and short (dot) sounds to communicate. The dot is the basic unit and the dash is equal to the length of three dot's. Morse Code was....
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This is not a sophisticated automatic keyer but it is lot QRP to build and to have fun operating it.
When the paddle is connected to the DOT terminal, C1 starts to charge. When C1's charge reaches sufficiently high value, it causes the transistor BC157B....
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The uWatch comes as a kit of parts. All of the electronic SMD parts on the PCB are pre-assembled. The uWatch is normally in sleep mode and powers down the LCD to save battery power. (approx 3mA LCD on, and 15uA LCD off) To switch the uWatch on press either....
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The 555 timer IC is connected for Astable Operation, the clock pulses are fed to the 4017 IC via the 10K resistor. The 4017 is a 10 stage counter, each of the outputs is connected to the appropriate LED, as some LEDs need to be on for more than one count, we....
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The object of Quick Draw is to test your reaction time against your opponent's. A third person acts as a referee and begins the duel by pressing S1, which lights LED1. Upon seeing LED1 go on, you try to outdraw your opponent by moving S2 from "Holster"....
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The ISD1000A is a Direct Analog Storage device which allows you to store 20 seconds worth of voice data on an IC chip which can be play backed anytime. The data stored will stay in memory even if the power is removed. To use the circuit below simple apply....
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These items were sold nationally several years ago. The fish would sing, open its mouth, turn its head, and flap its tail. After removing the back panel, all of the existing electronics were removed leaving only the 3 servo motors, speaker and photocell. The....
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This device 'listens' to a conversations and then interjects words and phrases at inappropriate times. I got this box at a local thrift store for $1.50 (special, this week only). It has a nice hinged top and a place to insert a panel with a designed glued....
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This circuit is a small digital ?roulette''. It is constituted by oscillator IC1, the counter IC2, the transistors Q1-7 that drive the display common cathode DSP1. The supply basically becomes from a battery 9V, but can become also from one power supply.....
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The IC1 is a 555 timer IC is connected for, Astable operation the clock pulses are fed to the IC2 via the 10K resistor. The IC2 is a 10 stage counter, output 6 (pin 5) is connected to RESET (pin 15), thus giving us a 6 stage counter , outputs 0 to 5. The 6....
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The particular circuit is substantially a generator of accidental numbers, from 1 until the 6. The clue him we see in a line from led, that each one corresponds also in a number from the 1-6, if push and leave, the S1 (push button). This movement corresponds....
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This circuit us gives the sense of movement of ball up down, after the LED turn on successively the one afterwards the other. As soon as it reaches in the one or in the other end it makes again the opposite movement to behind. As clock are used two inverters....
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This circuit is a double direction flash. Similar to Digital Ping- Pong 1, there is a movement of a lit dot, up and down along the LED's length. When the D16 lit the situation changes and there is a reverse movement. Lit D15-14 ??D16, is lit making circles....
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This project takes advantage from -HOLD input, which is connected to push-button P1. As long as the -HOLD input is low, truth table's timeouts have no effect because this input serves to disable any state change provoked by timers. The effect is to freeze....
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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....
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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....
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This schematic uses the 555 timer and the 4017 IC to drive 3 LED, to simulate the trafic lights...
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You 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....
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By using two 4516 ICs, this circuit will simulate two dices playing game. ..
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Today, we share a principle circuit of electronic games. The main circuit in accordance with the host through the IC2 reset press SB2, VD1A-VD9A not light. Prizes (for example 5) Which position by the number of people pointing Dot Award, the host closing the ..
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Circuit works: VT1 is integrated infrared receiver, the red-emitting diode Xiao perimeter triode reception. IC1 (NE556) is a dual time base manifold by R5, R6, C5, composed of an oscillation circuit, the oscillation frequency is about 1 200 Hz, by 5 feet to..
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The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12 volts and is easily assembled. You can have your own home intercom between the kitchen, the garage,....
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In this doorphone circuit,an 8 ohm speaker is used both as a microphone and also an output device. The BC109C stage amplifies in common base mode, giving good voltage gain , whilst providing a low impedance input to match the speaker. Self DC bias is used....
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You may wish to use a 12 to 24V battery, like a Gel Cell, since the car power or cheap power wall wart style supply is probably too noisy. You may have to adjust the resistor value (1.2K for 24V). Whatever gets the phones working and does not use more than....
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The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom.
Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for....
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Very simple and useful circuit for communication between two person. The Q1 is used to amplify the weak output signal of speaker when one push his (her) side push-button to speak. The base-common configuration of the Q1 pre-amplifier is for matching low....
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In order to achieve a status between two levels of switching for two calls at the same time, you must first establish privacy on each call. Otherwise, you will end up with all four phones talking to each other, and that just won't do. So the Link 'P' is an....
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The heart(s) of the unit are the ETAL P3400 line modules available from Farnell. These modules mop-up all of the line interface functions like ring detection, physical hybrid, on-off hook handling etc. This means that the TBU as a whole would probably pass....
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It's a very simple circuit, for the follow-up of baby. It can however be also used for other use, as intercom etc. In the place of M1 we can we use a simple electret mic capsule. The regulation of gain becomes from the R1, whoever can be trimmer or....
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This Intercom is powered by two 9volt batteries and uses only current when the Intercom is used.
Both units are connected via a two-wire little cable or simply two wires (dotted lines). The loud speakers act both
as loudspeaker and as a microphone.....
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The circuit comprises a 3-stage resistor-capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an asymmetrical astable multivib-rator generating ring signals. These ring....
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Carrier current remote control device or intercom circuit diagram as follows: ..
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When any particular key is pressed, its value will appear in BCD form at the outputs (A, B, C & D). It will remain there until another key is pressed. The 12 keys produce outputs up to "1011". Extended to 16 keys, the circuit will give the full HEX to....
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If your application uses a relatively powerful microcontroller, you can use several free I/O pins or an unused input with an ADC to effect an easy keyboard connection. But, if the microcontroller in your system has too few free I/O pins and no on-chip ADC,....
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No description available...
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Moreover, the method does not entail programming and the concomitant, almost inevitable, debugging. A CD4016 CMOS analog switch, IC1, forms the heart of the system. Depressing the key labeled "1st" closes the topmost switch (between pins 1 and 2), which....
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The circuit, shown Figure 1, depicts an application with
two keys. The PIC16C54 is normally in SLEEP mode
consuming very little operating current. If either of the
two keys is pressed, the PIC16C5X wakes up, scans
the keys and turns on one or both of the....
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Typically applications having LEDs and keypads also
keep track of real-time, in order to synchronize certain
related events. An Industrial Clock/Timer example has
been used in this application note as a demonstration
of these functions. The software....
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You can divide a large keypad or keyboard into sections of 12 keys each (Figure 1). Each section connects to a separate comparator circuit, which detects a keystroke and generates a trigger pulse using the monostable circuit of IC4, and you can add more....
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Figure 1s circuitry meets the discussed requirements. It
signal conditions a commercially available clip-on current
probe with a precision amplifier to provide 1%
measurement accuracy to 10MHz. The clip-on probe
provides convenience, even in the presence....
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The most popular LCD interface is the Hitachi 44780 based LCD controller chip which provides a fairly easy to work with interface and low power consumption. The major drawback of the interface is the perceived complexity of working with the interface. This....
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A practical, efficient LCD backlight design is a classic
study of compromise in a transduced electronic system.
Every aspect of the design is interrelated, and the physical
embodiment is an integral part of the electrical circuit. The
choice and location....
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The Liquid Crystal Display (LCD) is a thin layer of
Liquid Crystal Material deposited between two plates
of glass. The raw LCD is often referred to as glass.
Electrodes are attached to both sides of the glass. One
side is referred to as common or....
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This application note interfaces a midrange PICmicro
device to a Hitachi LM032L LCD character display
module, with a two line by twenty character display. LCD
modules are useful for displaying text information from a
system. In large volume applications,....
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The LT®1316, a
micropower step-up DC/DC converter with peak switch
current control, meets these needs. The device draws 33mA
quiescent current and contains a 0.6W, 30V switch that can
be programmed for a maximum peak current between
30mA and 600mA with....
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The resistor between basis and collector (around 47k) is to be individually set according transistor characteristics. Without PIC in socket at the collector should be 2.5 V...
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The circuit in Figure 1 provides ±18 to ±20V adjustable LCD bias voltages with 1% tracking accuracy. The circuit operates from a single 4.2 to 2.5V Li-ion cell for portable monochrome LCD applications. The circuit comprises two blocks: a negative-bias supply....
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Figure 9 is a detailed schematic of Figure 8s concept. The
resonance loop is comprised of Q4 and the CMOS inverter
based oscillator. The amplitude loop centers around the
LT1375 switching regulator. Figure 10 shows waveforms.
Traces A and B are Q2 and Q1....
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An LCD requires an ac electric field to excite the organic compound in the display. Applying a dc voltage could permanently damage the LCD. The circuit in Figure 1 is a simple configuration to test the performance of an LCD. The circuit produces biphase....