Popular Circuits Page 147
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the....
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In this Lesson, we will make a digital temperature meter using DS18B20. The connection between temperature sensor and microcontroller will be done through a single wire. This is advantage of the temperature sensor model. The temperature value will be....
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Here is a very simple and useful project of a 12V power supply circuit using LM7812 IC. LM7812 is a three terminal fixed voltage regulator IC comes in TO220 package. It has many built in features like thermal shutdown, short circuit protection, safe....
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This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side...
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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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Integrated circuit Ul (a 555 oscillator/timer) is wired as a conventional pulse generator. The frequency of the pulse generator is controlled by potentiometer Rll. Resistor R2 puts areasonable limit on the highest speed attainable. The output of the pulse....
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This is a simple video transmitter that can transmit as far as 50 meters. This video transmitter can be used with the camera or other video sources. You can view them on VHF channel analog TV. Supply voltage to the video transmitter can use 9V battery.....
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This circuit controls five outputs 220V. Potentiometer change speed and a switch select effect (one direction or both directions). The circuit has a divider by 10 (4017), a transistor oscillator (2N2646), the power stage and power supply. Each pulse on pin....
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In the figure, the TL494 is used as the core to form the PWM driver and protection circuit, and the changing frequency is 50kHz. 115V output voltage is sent to P8 after stepping-down and isolating, then it is sent to TL494 error amplifier A1 after getting....
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Just point this small device at the TV and the remote gets jammed . The circuit is self explanatory . 555 is wired as an astable multivibrator for a frequency of nearly 38 kHz. This is the frequency at which most of the modern TVs receive the IR beam . The....
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This is a single zone alarm - with automatic exit, entry and siren cut-off timers. It will accommodate all the usual types of normally-closed input devices - such as magnetic reed contacts, foil tape, PIRs etc. But it`s easy to add a normally-open trigger.....
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There are two types of pre-amplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SILICON CHIP. It has the RIAA equalisation network in the feedback loop. The second type was previously....
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Using a precision oscillator and a few CMOS counters, you can build a precise, very low dutycycle pulse generator. You can add as many counters as you desire to make the period as long as you wish. ..
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Certain circumstances and areas demand detection and securing of the entrances paths through alarm systems, so that the whenever an individual opens the entrance door the situation is instantly tracked by ringing an alarm. Battery operated window and door....
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This is the circuit diagram of linear FM Booster / RF amplifier based 2N4427 Philips transistor. The RF Amplifier is for boosting small fm transmitters and bugs. It use two Philips 2N4427 and its power is about 1Watt. At the output you can drive any linear....
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The bases and emitters are tied together, so the base-emitter voltages are equal. Since we assume the transistors themselves are identical, equal Vbe means equal current into the base. And equal current into the base means equal current from collector to....
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This circuit is very basic to build and puts out great power for your car or home. Keep all leads as short as possible...
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To boost the output power of low power FM broadcast band exciters, a number of these are available commercially, both as kits and ready made. See How to be a Community Radio Station for links to reviews of some of the more popular exciters. Unwanted spurious....
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This circuit charges two NiCad cells with a constant current and features dual charging rates, voltage cutoff and an audible alarm. The circuit is powered by a 12VAC centre-tapped mains transformer, together with two rectifier diodes (D1 & D2) and a 1000mF....
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The Star Delta starting method is a motor starting mechanism that minimizes the large amount of starting current that motors draw in. The Star Delta, as the name suggests basically involves feeding the motor with 1/sq. root3 (58%) of the full load current....
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A simple power op amps to 300 Hz operation. One type of circuit is more difficult to protect the flow regulator. Because it`s been fixed, the normal protections are not working. Circuit to limit the voltage regulator allows the flow of excessive current flow....
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Developing a sensor to measure the snow. If the sensor could be made inexpensively, then the power of the Internet could be used to collect a large number of samples over large areas. The popular weather datacollections sites ( Weather Underground, Citizen....
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In the event of combustible gas, the conductance of TGS308 gas sensor increases, and the voltage is removed through the potentiometer RP1 slide point, and its value is increased from normal 3V rms to 20V. This elevated voltage is added to transistor VT1....
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The starting ability of the power of intermediate frequency is the most important performance index, quality and usability of its quality direct influence apparatus. So, it has focal point and difficult point that has studied in the industry to start the....
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L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit. ) With their C7, C8 we adapt the resistance of aerial....
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Circuit is shown, which consists of a DC voltage regulator circuit, the delay circuit, overvoltage and undervoltage protection part of the implementation of circuit, and the li..
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Because the transconductance of an operational transconductance amplifier is directly proportionai to /ABc. the amplification of a signal can be controlled easily. The output current is the product from transconductance X input voltage. The circuit is....
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Here is a very simple infrared detector circuit which can be used to detect infrared light. The circuit is consist of only three components a RS-276-145 photo transistor, 330 Ohms resistor and a general purpose LED (Light Emitting Diode). When the photo....
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Al and A2 are two sections of a quad comparator. The first, Al, functions as an amplifier and detector. Resistors R~and R6 set the gain at 100; the output of Al is an open collector to negative-peak-rectify the output with a decay time constant determined....
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This ambit is a simple two transistor (2N2222) mini FM transmitter. No authorization is appropriate for this transmitter according to FCC regulations apropos wireless microphones. If powered by a 9 volt array and acclimated with an antenna no best than 12....
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Learn to use the LCD display on your pic 18 explorer board with the spi library. The spi library will be used to easily display characters on the LCD. You will also learn how io expanders work...
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Bolometer systems would be simplified considerably if all components could be made photolithographically on a single substrate. We are developing a design for a single-substrate array with several frequency bands that incorporates a planar antenna for....
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The following circuit shows about BC 109C For Tone Control Circuit Diagram. Features: all audio frequencies are attenuated,high input impedance, ....
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This alarm is designed to sound its Siren only once. That is - when the alarm is activated - the Siren will sound for a preset length of time. Then it will switch off and remain off. The alarm will not re-activate. The basic alarm has a single zone with....
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Here`s a design circuit for very simple low cost and ultra compact VHF UHF Low-Noise amplifiers circuit can be designed using the MAX2664 and MAX2665 ultra-compact LNAs for VHF/UHF applications. These devices incorporate a broadband LNA with an integrated....
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This particular timing circuit can be used to time one-shot events from a few seconds to a few hours. And in standby mode (ie, with RLY1 and LED1 off), its power consumption is very low. The heart of this circuit is a low-cost CMOS 4011 quad NAND gate, with....
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I don`t the right place to post this but I`ll try my luck here: I`m looking to build a timer for a pump. I want the pump to run for 5 minutes, then....
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For a 4-bit Carry Look Ahead Adder have 3 gate delays for all carry bits and 4 gate delays for all sum bits, while it is stated as 7 and 8 in case of ripple adders. How, was this calculated The image of 4 bit carry look ahead adder is shown below:..
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This touch switch does not rely on mains hum for switching-It-can be used with battery powered circuits. Schmitt trigger IC1 forms a 100 kHz oscillator and IC2a which is biased into the linear region, amplifies the output and charges CI via the diode. IC2b....
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Description:This circuit shows about 7555 IC For 5 To 30 Minute Timer Circuit Diagram. Features: useful circuit because by using this circuit you can operate ....
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Simple to build, simple to make, nothing too complicated here. However you must use the CMOS type 555 timer designated the 7555, a normal 555 timer will not work here due to the resistor values. Also a low leakage type capacitor must be used for C1, and I....
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A sensor in garden railway applications. Hall Effect sensors are the electronic equivalent of a reed switch. You can think of them as a cross between a reed switch and a transistor. They are frequently used to determine the rotational speed of a spinning....
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Connected in this manner, an LM317 1-A adjustable-voltage regulator can be used to control the speed of a miniature dc motor or vary the brilliance of a small lamp. The circuit does so by controlling the pulse width, and therefore the current, to the load....
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A circuit that will find enough applications. Basically the designing became in order to exist delay in quench one or more lamps in a stairwell or in any other space exists this need. It can become use, for the control various motor or other appliances, what....
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Up to eight players each have their own answer button to press, corresponding to the four Red Team and four Green Team LEDs on the master control board. As soon as the first contestant who thinks that he knows the answer presses the button, a loud tone....
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I own a 2005 McGregor 26 sailboat. I had a Standard Horizon CP150C installed in my boat. I recently moved my boat to British Columbia, Canada and to my surprise my GPS unit did not power on. Although it is an old model it is brand new. I am the original....
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Hello all, Recently I acquired some samples of IR LED`s, and a matching IR Phototransistor. I was bored, and decided to make something with it!....
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This circuit is connected directly to a 220V home electrical installations. LOAD on the schematic diagram above, is an electronic device with 220V AC current consumption...
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That hum noise is produced by electronic device with improper design, yes you`re right. And you might choose to solve the trouble maker, the source. You begin to check the grounding, the cabling, casing, and many more things you can do to eliminate the hum....
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This diagram is certainly the 6 transistor Tilden H-bridge circuit; while not as old as the original basic H-bridge, this goes way back, and will be the basis for a lot of BEAM driver circuits. Bruce Robinson explaination about this circuit....
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Fig. 296 can use a control switch S El, E2 and E3 three lamp light off. E is suitable for the living room chandelier control. When s off, lights all the fire; for the first tim..
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I am trying to get to the bottom of some low RPM problems and wanted to get some expert opinions before i start cutting wire looms apart to trace a....
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This circuit uses a Cmos 4017. The 4017 is a decade counter. The count starts at zero. And it advances by one - each time pin 14 is taken high. When the count reaches nine - it goes back to zero - and starts all over again. = As the count progresses - each....
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Dual Timer Exar XR-2556 for the first time after the timing of the output can be triggered by capacitive coupling second timing pin. When the trigger input is used, in order to..
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Here, SG3524 only as a pulse width modulator uses. The error amplifier is connected to a follower form. As shown in Figure 10-7. ACR output connector 2 PWM output pin as the control signal. V. VB and take parallel single-ended output. S, closed, shut off ..
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This circuit was designed for testing fuel cells, but it could also be used for testing batteries under a constant current load. It provides a dynamic, constant current load, eliminating the need to manually adjust the load to maintain a constant load. For....
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Features: 1.3-12.2 V, 1 A, over-current protection. This is a simple but reliable device based one of the oldest integrated voltage regulators of them all - the LM723...
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The Passive tone control circuit be the circuit fines the bass that has no the expansion but will give kind equipment R and C. It perform filter frequency then the circuit that build easy and must not use power supply. By can concede the porch with part....
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The 2N2222 circuitry is a three-element, phase-shift oscillator circuit, designed to yield a 1,000-Hz sine wave. The 1,000-Hz sine wave is then applied to the TCG-610 varactor diode, 6 pF at 4 V, which changes the tank capacitance, thus varying the rf....
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Simple silicon-controlled dimmer As shown in Figure 13, it is a simple circuit of SCR dimming lights. The w resistance in the potentiometer decreases, SCR conduction angle increases, the light`s intensity increases, the resistance enlarges, the SCR....
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Use NJM2701 3D surround sound audio processor integrated circuit can be designed a very simple 3D surround sound system. NJM2701 is a 3D surround audio processor reproducing 3D surround sound with only two speakers. NJM2701 is suitable for audio applications,..
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High sensitivity, portable temperature comparator. This sensitive circuit is basically a comparator, detecting very slight temperature changes in respect to the ambient temperature. It was primarily intended to detect draughts around doors and windows that....
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Nothing wrong at all with that setup IMO. I`ve an (older) Peltor FMT15 amp in my Golf. Works awesome for 2 Peltor headsets. The issue is mixing Peltor & Terraphone headsets/amps. All (3) of the cars I`ve co-driven in this year have Terraphone amps. They`ve....
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A square wave generator with IC UA741 range shown here. The circuit uses positive feedback to the Schmitt trigger action and negative feedback to measure the time of the waveform. Let us assume that the output is high and the capacitor C1 is fully....
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A simple humidity tester circuit using just a LED, transistor, and a few resistors is explaind with a neat circuit schematic....
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According to the datasheet. I connected the respective color wire to the respective pin of l293D according to the following circuit diagram..
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LM331 is the single voltage / frequency conversion IC within 1.9 v reference voltage, current switch, comparator and flip-flop, etc. In order to expand the range, the circuit is added A1 op amp. The reference current IR is decided by (Rl + R (RPl)), as the....
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I want to make a simple circuit with a microphone that just takes your voice and sends it to a speaker. I just want to understand how to hook up a mic....
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The only SOT-23 op amps featuring Over-The-TopTM operation
the ability to operate with either or both inputs
above the positive railare the 55mA LT®1782 and the
300mA LT1783. This feature is important in many currentsensing
applications, where the inputs....
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This simple automatic emergency light has the following advantages over conventional emergency lights: The charging circuit stops automatically when the b....
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This circuit used to come as a kit from a surplus supplier, but probably isn`t available anymore. It shows a few novel concepts such as using a 555 as a pulse width modulator (PWM), and series/parallel camera flash transformers. WARNING: This circuit is....
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As shown in FIG relay is non-inductive analog circuit theory. working principle: 220V power supply via a load RL, R1, D1 ~ D4, ZD1, as Q4, Q3 in turn provide positive and negat..
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The simple FM radio circuit got lost during the transition from vacuum tubes to transistors. In the late 1950s and early 1960s there were several construction articles on building a simple superregenerative FM radio. After exhaustive research into the early....
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Part II of the AAM Commander RC System Article, scanned from the May 1972 edition of American Aircraft Modeler....
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This power supply is able to deliver adjustable center-tapped DC from 0 to about 30 volts, as well as AC directly from the Variac and from the main transformer before the rectifier. What's primitive by today's standard is that it is not voltage regulated;....
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With a matching antenna, the FM transmitter circuit shown here can transmit signals up to a range of 2 kilo meters. The transistor Q1 and Q2 forms a classic high sensitive preamplifier stage. The audio signal to be transmitted is coupled to the base of Q1....
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The best-known ways to transmit a digital audio signal (S/PDIF) are to use a standard 75? coaxial cable or Toslink optical modules with matching optical c....
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This is an simple Vox AC amplifier. The circuit is not very clear but is readable...
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Since my page was first posted, I have received a number of emails asking about a high current power supply. I looked around, but couldn`t find one that was suitable. So, I designed this. It is a linear supply, which might have a few of you rolling your....
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A Light Dependent Resistor (LDR) to create a simple childrens bedroom nightlight which turns on automatically when it gets dark and turns off when it gets light. An LDR`s resistance changes depending upon the amount of light hitting the sensor. For the LDR....
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Power circuit Reset circuit USB connection ABDAC sound DAC Interface JTAG and Nexus debug ports Clocks and crystal Oscillators 1 Introduction A good hardware design comes from a proper schematic. Since UC3B devices have a fair number of pins and functions,....
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As the figure 17-1 showns, the camera flash delay circuit can be used to capture the high-speed scene, and you can get a very short exposure time. The light door is composed of the luminous diode and the 3DU type photosensitive tube. When the light is....
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A few of the many ways to input a signal into the NE602. Simple untuned methods (a and b) are acceptable. If you need to tune to a specific frequency, you can use an LC resonant circuit with un-grounded trimmer capacitors (c and d) or with grounded variable....
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In this circuit, a square wave is filtered by a high-order low-pass filter so that a -3-dB frequency will eliminate most harmonics of the waveform. As a result, the filter outputs a fundamental sine wave. This method is applied to generate a sine wave by....
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Observing my "Boss" pedals and how they were switched on and off I figured there must be more to it. It took me only about 4 hours to design and test this circuit, It works very well and I`m really satisfied with it so I`ll be using it in all the effect....
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The medical ultrasonic atomizer circuit is composed of power supply circuit, atomization amount liquid level detection control circuit, ultrasonic oscillator and fan motor M, it is shown in the figure 9-111. The power supply circuit is made of timer Q, fuses....
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In the Sine wave oscillator circuit often to be use the thermistor and Incandescent lamp, for upset the output of circuit has fixed value, the resistance of....