Popular Circuits Page 208
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A very interesting project of a light activated alarm or morning alarm circuit. The circuit will produce a beautiful melody when it will detect light. You can use this circuit as a morning alarm, for this purpose first select a permanent place in your home....
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Provided only manual recording level control function, when the circuit is in the recording mode, the recording level as LM3915N was shown...
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Although you don`t find SCR and Triac in all electronic equipment, this does not mean that both are not important components. You need to learn how to test it so that when you come across one in the future you will know if it is good or bad during....
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This is a Full wave omni directional vertical ground plane antenna for 2-meters plan with 250 watts max power...
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Calculated the output of the transformer to be 125 times (1000 / 8) higher than input. Since 12v is given as input, output should be 1500v (not sure about this)..
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As illustrated, the 555 (or 556 1/2) and three resistive, capacitive element connected as shown, constitute astable multivibrator mode. And one-shot mode except that only the t..
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The heart of the clock is a PIC 16f628A microcontroller (PDF). This microcontroller has an internal oscillator however an external 20MHz crystal oscillator is being used since it will have to accurately keep track of time for weeks and months. The....
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Circuit is shown. It includes a full range of vibration sensors, follower, lamp relay control circuit, voice sounding circuit, high-frequency oscillation circuit and the AC rec..
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In order to obtain a good audio reproduction at different listening levels, a different tone-controls setting should be necessary to suit the well known behavior of the human ear. In fact, the human ear sensitivity varies in a non-linear manner through the....
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The following is one of the most rare and special documents here at the DigiBarn, the only known copy of the complete schematic specification of the 512K Macintosh Logic Board. Daniel Kottke co-authored this design which served as the basis for the 64K....
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This is a power supply circuit that produce voltage 12 to 24 V. It is very simple, doesn`t need regulator just bridge rectifier, filter capacitor and transformer. A bridge rectifier makes use of four diodes in a bridge arrangement to achieve full-wave....
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Many designs require FIFO elastic buffers to form a bridge between subsystems with different clock rates and access requirements. However, in some applications, you need FIFO buffers for data conversion. One example is the case in which you need to connect....
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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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A circuit which utilizes a photo-transistor to make a light sensitive switch that is when there is no light in room, the led connected to the photo-transistor lights up and when there is light in room, the led connected to Phototransistor turns off Any....
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This instrument measures inductances from 0. 1 microhenry to 3 millihenries divided into four ranges set by a switch. It operates from 12 volts, and is powered by eight AA type cells attached to the unit. I initially referred to Drew Diamond`s unit in....
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The schematic is this fairly simple transistor circuit: Seeing schematics with transistors in them brings back a flood of memories to my college days when I was taking EE classes and I used to know how to do this stuff in my sleep. Unfortunately, that was....
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Automatic emergency lamp circuit It shows the electronic switch integrated circuit of automatic emergency lamp circuit. Made into the circuit with automatic emergency lights in..
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The multivibrator is a common circuit that consists of an amplifier with both positive and negative feedback (Figure 1a). When the output is positive, the positive input terminal equals ½V+, and the voltage at the negative input terminal changes toward V+.....
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The catering better it does not become at straight line from the network 220V but via transformer 220V/220V of isolation and safety 1A. When does not exist the R3, the force of expense is bigger, but respectively is increased also the hum 50Hz, because the....
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The eight SDI input stages use the new GENLINX¾II GS9024
Equalizer IC. Input Return Loss of the PCB is optimized by using
R-L circuits at each input. Each GS9024 performs high quality
signal equalization over a wide range of data rates from as low
as 30....
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This circuit have an advantage over ordinary CONTINUITY testing Device, usually we are using multimeter to check the continuity of a circuit. It is not suitable to check the continuity of a circuit with high Impedence or resistance like Transformer,....
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This solid-state push-pull single-ended Class A circuit is capable of providing a sound comparable to those valve amplifiers, delivering more output power (6. 9W measured across a 8 Ohm loudspeaker cabinet load), less THD, higher input sensitivity and better....
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It`s a typical AMV (Astable MultiVibrator) setup. The capacitor gets charged through both resistors until 2/3 Vcc is reached (internal comparator level). This sets a flip-flop which activates the Discharge output (DIS). Through DIS and the potentiometer, the....
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This really a work that so cool if you like modif PC. So this is a USB interface for alphanumeric LCD display like 4 G— 20 which can be controlled with LCD Smartie program. USB interface is implemented by using PIC18F2550 microcontroller, Using USB LCD....
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This is 80Watt power amplifier OCL circuit using devices pillar is the integrated circuit LM12. This interesting routes many good bass and treble alive. If a friend is the CD therefore has a beautiful voice and Pre Tone Control is good that some will take....
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This is a simplified design using a up/down counter IC, 74192. It is a versatile logic IC that has a separate pins for up and down count. Also, an RS latch is used for the indicator of the counter number. ..
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Adjustment potentiometer RP, can change the TRIAC V conduction angle, to achieve tempering purposes...
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What is the meaning of the picture above The above picture is a miniature audio amplifier and very simple. Here I will give an audio amplifier schematic is very simple which only requires a few components only, can be seen under this scheme. See from above....
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Herein is the scematic picture of 9-Pin RS232 Line Booster Signal Direction. This device is a 9-pin RS-232 repeater that re-transmits all 8 signals and carries the ground line through..
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This circuit breaks an input voltage signal down into its components: (1) the absolute value and (2) the polarity or ‘sign (+ or ). It will handle direc....
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FIG. 1 is a circuit diagram of it, it is in the audio circuit from the resistance between the two leads to a probe to rain alarm. Fig. 2 with CCL to make a probe connected to t..
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The following circuit shows about Curtain Control Circuit Diagram. This circuit based on the 555 IC. Features: Switch for manual control, IC and a ....
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This lie detector circuit diagram will accord two readings: one for difficult questions for the accountable and addition to appearance its affecting accompaniment in general. The affecting states are detected not alone by affection exhausted accelaration and....
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The below diagram shows H-Bridge with 4 inputs and external power supply, the control application must allow the motor to be operated in forward and reverse directions..
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Circuit diagram is a very simple circuit-level indication, with 10 Led. Used a series of half-wave rectification of precision around IC2 TL071, with a single. LM3915 IC is used to control the led, as an indicator VU Meter. LM3915 can be controlled 10 led.....
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Ni-Cd Ni-MH Adjustable Constant Current Battery Charger Circuit This is a Adjustable Constant Current Ni-MH or Ni-Cd battery charger circuit. It can be used to get a constant current power supply. Here is the schematic diagram of the circu....
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Terminology TS555 a single CMOS timer which offers very low power consumption and high frequency where the timing remains very accurate in monostable or astable mode while providing reduced supply current spikes during output transitions, which enables the....
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Despite the high impedance of its inputs, Darlington Q10 develops enough current to drive an LED. The inverted output of Q10 drives opto U5`s internal LED. Opto U5 couples to motor-control triac CR1. Motor Voltage Control Triac CR1. Triac CR1 is a....
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The fax mate separates the fax machine from the phorie line, rings the fax machine on command, connects equipment to incoming lines, and senses the end of the message. When a touch tone pound signal (#) is detected, it actuates a ring greater and driver for....
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Lamp II is a household lamp. When the switch is in the center position, the lamp is operated on half-wave rectified ac; the ef..
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A cellphone operated robot and i`m stuck with Atmega32A microcontroller programming. As software you can use then AVR STUDIO 4. Unter the Tools you can find the Menu "Programm theAVR" Chose there your used Programmer and you can setup and Programm your....
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The Current Sensor Board contains an Atmel AVR AT90S8535 running at 8MHz which samples six ADC current inputs and uses the remaining two ADC inputs to control an integrating charge counter and packages the results up into data packets which are sent to the....
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Automatic electric furnace temperature controller shown in FIG. 1-25. The closed circuit is formed from a temperature detection output control loop; the temperature rises, the ..
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A neon bulb and a CdS photocell enclosed in a light-tight enclosure form an optocoupler. A diac/triac combination is used to provide the snap- switch effect. A second CdS photocell acts as the main sensor. As darkness approaches, the resistance of K4 begins....
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As shown for the basic connection circuit INA166 signals and power. Chip power supply terminal to use 0.1 F tantalum capacitor filter, PCB layout should be as close to the chip..
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The disadvantage of infra-red or wireless remote control is a remote transmitter is often misplaced. This circuit design offers a way to control ....
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It is quite easy to miss the sound of a doorbell if you are watching TV, this circuit gets round the problem by providing a visual indication, i. e. a lamp. As an alternative, a LED could also be used. You could just parallel a lamp across the doorbell, but....
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As you can see, there is only one regulated 12 volt supply operating the entire circuit. I was able to do this simply by AC coupling the received signal to U3 via C10. This allowed me to adjust the offset within an operating window. By using a tantalum....
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This heat detector alarm electronic project is designed using the UM3561 sound generator circuit and some other common electronic parts. This heat detector circuit project uses a complementary pair comprising npn and pnp transistor to detect heat. When the....
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Small additional circuitry during standby can boost efficiency tremendously In a modern car several microcontrollers for safety, navigation, entertainment and comfort electronics have to be supplied. Most....
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The transmitter is a very simple crystal oscillator. The heart of the circuit is the tuned circuit consisting of the primary of the transformer and a 10p capacitor. These two components oscillate when a voltage is applied to them. The frequency is adjusted....
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This circuit is a circuit diagram of resource replacement 1. 3V mercury cells or other small batteries. This has many uses and you can use this circuit in the computer to turn on a front panel multi adapter which has a digital thermometer. This circuit took....
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This circuit uses a FET as a dc amplifier in a bridge circuit. R4 is set for meter null with J1 short circuited. Any surplus 50-mA meter can serve in this circuit. RFC1 is any suitable RF choke for the band in use. A 2.5-mH RF choke will do for broadband....
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Modern high-performance transmitters require accurate monitoring of RF power, because most cellular standards depend on strict power- transmission levels to maintain an effective network. Regulation of transmitted-signal strength also lets you build lower....
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This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of times - or repeat continuosly. The individual events within the sequence - can be made to repeat....
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This circuit will allow you to set the gain of two stereo channels to the same level. The signal across the two channel-load resistors is sampled by resistors R2. (Values of these resistors will depend upon the power level) For most 20 milliampere LED, use....
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1Hz Clock Generator Circuit with Chip On Board (COB). The COBs used in different watches may differ somewhat in their configuration. But by trial-and error one can always find out the appropriate points corresponding to points A, B, C and D. This is the 1Hz....
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This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation and small size, the device is suitable for mounting on bicycles....
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buzzer circuit, pic microcontroller, piezo buzzer is a computer chip. It is overkill for driving a piezo buzzer. It is certainly a very low power processor that is optimum for portable and small devices where battery power must be conserved....
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A couple of few years ago I had build a diode-sensor based RF powermeter using a 68HC11 microprocessor. Even before that I had build an analog RF powermeter with thermal power sensor. And I found datasheets of logarithmic amplifiers very interesting, that....
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This is a battery tester circuit.This circuit is used to indicate whether the level of a battery voltage is normal, under-voltage, or over-voltage, very....
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Strictly speaking, this simple circuit shouldn`t work! How could anyone expect an ordinary light dependent resistor photo cell to `see` through a fingertip in natural daylight and detect the change in blood flow as the heart pulsates The secret is a high....
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The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons can be wired in parallel to control the relay from multiple locations. A high level from the push button is coupled to....
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Ultrasonic sound wave can be generated using electronic circuit. This simple electronic circuit can generate an ultrasonic wave with frequency range of 12 to....
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When one of the normally-open switches is closed - two things happen. Firstly - the negative side of the relay coil is connected to ground through D1. This causes the relay to energize. And the relay in turn sounds the siren. = Secondly - the emitter-base....
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The following diagram shows the basic laser pointer circuit. It is identical to the infrared circuit except that the infrared LED`s have been replaced by the laser pointer unit.
Due to the long range of these devices this detector method can easily....
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There are at least 3 different versions of this circuit. The first DM-2 version was using the MN3005 BBD and the MN3101 Clock Driver IC (PCB marking: ET5214-510). Later they changed the clock driver to MN3102 and the BBD to the low current version of the....
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The circuit is a basic 555 timer circuit in astable mode. In this configuration the IC sends a brief pulse to the buzzer every few minutes. The values....
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DESCRIPTION This project is to make a clone of Arduino Leonardo in a simple way.That is why the distribution of the pin does not match the standard Arduino...
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This circuit shows about 300-350W Lighting Control Circuit Diagram . Features: Cheap to build, Simple circuit, 120V AC voltages. Component: ....
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Where good frequency stability is required, in applications such radio transmitters, basic LC oscillators cannot guarantee to hold their frequency without some drifting, which can be caused by quite small changes in supply voltage (although stabilised power....
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The 2400-bps modem in Figure 1 makes it easy to connect a Basic Stamp (Parallax Inc, www.parallaxinc.com) to a telephone modem. Using this circuit, you can call home via your PC and find out if the house is still there. The Basic Stamp2, BS2-IC, has the....
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Simple two transistor TV transmitter circuit that operates from 12V.Compatible with PAL B and PAL G systems....
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This encoder can generate up to 19,683 codes from 9 address lines by detecting 1,0, or open circuit. To initiate the transmit sequence, pin 14 should be pulsed low. The encoder will now output on pin 15 a data stream representing the condition on each of the....
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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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In general there are two ways to control DC motor speed: by varying supply voltage and pulse width modulation (PWM). First control method is not convenient especially in digital systems. It requires analog circuitry and so on. Second motor speed control....
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Convertor circuits are widely used in all places and there are several types in it. Here is a simple Frequency to Voltage convertor circuit uses a IC LM331 which is basically a precision voltage to frequency convertor. This IC has lot of applications with it....
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Both used a pair of capsules from Neumann`s K67 family, mounted one atop another, with the top capsule having the ability to be rotated 270 ° against the bottom (presumably, -90 ° +180 ° like the USM 69). The capsule is Neumann`s K870, a 34mm design with....
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Cable radio broadcasting studio in rural villages and towns with a high-power amplifiers easily damaged, the main reason is the frequent use, no special management, often shutt..
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As shown with a bridge input circuit phototransistor BPY62 power operational amplifier and can control up to 8.5kW of power load off. Two 10k ohm resistor divider midpoint comp..
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As illustrated, the filtering and amplifying circuit composed of two parts. Wherein the filter MAXIM MAX267 is an integrated company produced, may constitute a low-pass, band p..
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Amplifying and limiting of the AM carrier is accomplished by the if gain block providing 55 dB of gain or higher with a limiting of 40 µ\. The limited carrier is then applied to the detector at the carrier ports to provide the desired switching function.....