Popular Circuits Page 198
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This alternator regulator uses a 3-transistor dc amplifier, and is designed for a pulled up field system, where one side of the alternate field returns to the +12-Vsupply, and the other end is pulled toward ground...
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Is the use of LM324 as a band-pass filter, LB1405 for five-band spectrum display drive display circuit. Point 3 is selected frequency harmonic relationship, their center frequency is 100Hz, 330Hz, lkHz, 3.3kHz, 10kHzo band-pass filter is 0 = IO.KF = o 20 cases..
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This is the simple basic design of servo motor controller with pulse generator. It uses the CMOS IC 7555 in the Astable mode to generate pulses to drive th....
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A AD590 or AD592 can easily in a transmission line temperature data transmission. The circuit generates a value 1mV/(or is 1mV/F using the values in brackets). ..
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This schematics show a digital thermostat designed for controlling ambient temperature inside a house. Thermometer display temperature in 0C. 99. 9C range and the thermostat can set a temperature in 0. 99C range. The temperature real range is between 12C and....
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For an upcoming project I needed a pneumatic ram with a closed loop control system so I could position it accurately. Didn`t have the budget for an off the shelf solution, so I bodged one together with an ardunio, a couple air solenoid valves, and a pair of....
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Hello world!, The more you understand about any subject, the more interesting it becomes. As you read this article you`ll find that the subject of....
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Safe 12V car adapter described here can be used to limit a +12 volt car battery current, available from the in-dash cigar lighter power port, to below 2.6....
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Are you a beginner in micro controller projects and are you stuck where to start from if yes, then this is one of the simplest mini projects that you can start from. This mini project will give you a clear understanding of programming your micro controller.....
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Many designers today are implementing embedded systems that require low cost non-volatile memory. Microchip has addressed this need with a full line of serial EEPROMs, in a variety of memory configurations, using the industry-standard 2- or 3-wire....
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The series is a series of input buffer equal to the output. In this is such a common collector circuit of air-reinforcement = 1. R value attached to restrict the current use is issued. Great value depends on the indication of its components, is usually not....
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The Poppet" is a half-watt AM transmitter designed by Mr. Doug Gibson of England. The original design was published in issue 84 of SPRAT, newsletter of the GQRP Club. The version shown here incorporates changes suggested by Steve Hartley and others. Although....
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As shown in FIG amplification is used to convert a variety of devices and TV video output signal, such as some VCRs, DVD players need weak output signal amplification occasions..
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GH-75 type circuit hydrogen atom welder Hydrogen bonding, is not melted by the use of hydrogen in two under the protection between the tungsten electrode WG produce electric arc welding wire in hydrogen melting workpiece weld region under the protection of...
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This a shows the overall circuit diagram of the power control unit. On the left, there is a main relais controlled by the key switch and the ....
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Here`s a power-on time delay relay circuit that takes advantage of the emitter/base breakdown voltage of an ordinary bi-polar transistor. The reverse connected emitter/base junction of a 2N3904 transistor is used as an 8 volt zener diode which creates a....
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This transmitter with a good antenna and under proper conditions of use may have a range of more than 45km. The configuration is made by the rise of the output lamp, which makes it advantageous as regards the fidelity of the emitted signal. The 6V6 lamp is....
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As shown in the battery voltage is 1v low frequency amplifying circuit, the circuit can operate at 1 ~ 1.7V power supply voltage, it can be powered by small batteries. Output p..
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Adding a simple clamping circuit to a Harris 2620 high-speed op amp produces a glitch-free amplifier/ clipper. The op a..
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This circuit was designed to detect the approximate percentage of salt contained in a liquid. After careful setting it can be useful to persons needing a quick, rough indication of the salt content in liquid foods for diet purposes etc. This circuit is using....
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Astable Multivibrator can be designed by using 555 timer IC, Op Amps and also using transistors. The 555 IC provide accurate time delay from mille seconds to hours. The frequency of oscillation can be controlled manually by simple modification. This is a....
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The dc motor is used as a generator with the voltage output being proportional to its rpm. The LTC1042 monitors the voltage output and provides the following control functions. If generator voltage output is below 13.8 V, the control circuit is active and....
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This is a description of an experimental AM receiver for VLF. It is crystal controlled to receive 181.818 kHz (more or less) and operates as either a single conversion superhetrodyne or a direct conversion receiver. The bandwidths are expected to be 15 Hz to....
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USB Battery Charger For Lithium Ion battery with the LM3622 is a series of lithium ion battery charger. This charger circuit operates using power from the USB source computer. Current consumption of a series of with 400mA LM3622 is limited by R1, so it does....
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VU meter or a volume unit meter is a device used for indicating the music volume output from an amplifier or a loudspeaker system. It may be also considered as a device for displaying the PMPO of the amplifier at a particular volume setting. Though the unit....
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To resolve SSB or CW, a BFO signal may be coupled into the intermediate frequency amplifier. In these circumstances, the BFO has to operate near the intermediate frequency of the receiver, for transmissions of all frequencies. So with a BFO of this type,....
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The Interfacing Bluetooth module with LPC2148 program is very simple and straight forward, which send a message to mobiles from LPC2148 Primer Board through Bluetooth module by using UART0. Some delay is occurring when a single data is sent to mobile through....
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I recently prototyped a Tube Screamer type circuit to refresh my memory about the sound of this pedal. I used a borrowed TS-808 and a Pro Reverb in the mid 80s for several weeks while my modded Twin Reverb was being fixed and I remembered it sounding pretty....
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The SA1691 is a monolithic integrated circuit designed for Radio cassette tape recorders, Clock Radios and Headphone Radios This IC include all function from Antenna to Audio power Amplifier of AM/FM Radio By Silan ..
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Operational amplifiers Al and A2 are connected in a noninverting configuration of their training sorties amplifier A3. The operational amplifier A3-one could call a subtractor circuit that converts the differential signal between the floating point X and Y....
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When the 555 ic goes into timing mode (triggered by an output signal from the sound detector amplifier,) the timer`s output (pin 3) is set into HIGH for a duration set by C2, and R2. adjusting R1 will adjust how long it listens, from 10 seconds all the way....
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One of the requirements that is easily overlooked is the need to identify your station during your video communications. From what I have seen, some R/C wireless video users are neglecting to broadcast their ham radio call sign. Essentially, USA hams must do....
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A variable oscillator covers 3.2 to 22 MHz in two bands—providing coverage of 80 through 15 meters plus most crystal-filter frequencies. Optional 455 kHz and 10.7 MHz crystal oscillators can be switched on-line for precise if alignment. Generator output is....
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GENERAL DESCRIPTION The TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum on peripheral components is important (small dimensions and low costs). The IC has an FLL (Frequency-Locked-Loop) system with an....
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A sound level meter circuit with diagram and schematic using IC LM 3915,which is an audio level measurement chip.Used to display amplifier sound level or a microphone sound level....
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The first circuit was designed for the situation where a hijacker forces the driver from the vehicle. If a door is opened while the ignition is switched on - the circuit will trip. After a few minutes delay - when the thief is at a safe distance - the alarm....
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This unit recieves DMX 512 data and Analogue (0- 10v) data and uses these to phase angle control mains output. Features: DMX 512 data Input. Analogue (0- 10v )DC Input. 4 Output channels. Remotley programmable Interally saved Presets. 3 Modes of operation....
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To display an rf signal, connect LI to the transmitter and points A and B to the vertical plates of the oscilloscope. Adjust LI for minimum SWR and C3 for the desired trace height on the CRT..
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Most multimeters today have an auto turn-off feature built in. There is enough space in a multimeter enclosure so why not to install a simple circuit that....
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This humidity detector circuit diagram is very simple and uses few components and can be used for activation of an electronic devices when the detector senses a certain humidity. The sensor is constructed from two pieces of copper placed at a short distance....
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Fluorescent tubes use far less energy than incandescent lamps and fluorescent tubes last a great deal longer as well. Other advantages are diffuse, glare-free lighting and low heat output. For these reasons, fluorescent lighting is the natural choice in....
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Since the maximum charge voltage measures 1. 45 volts and higher trigger threshold is about 1. 7 V, this voltage can be adjusted using potentiometer P1 to the value of 1. 45 volts. TTL control signal output by the voltage divider R4/R5, constant current....
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In the circuit, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-)....
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High brightness (HB) and super HB LEDs are found in LCD TFT backlighting in highend TVs, industrial lighting, and projectors. One popular area is for instrument panel backlighting, interior lighting, and the brake lights of many cars and trucks. Luxury....
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The circuit can use any general-purpose, low-offset, low-drift op amp, such as the OP-07. The differential signal from the bridge feeds an amplifier that drives an ordinary, rugged ±50-p.A meter. Near the null point, however, the drastically reduced....
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Circuit for applying a dc-coupled FM or PPM to a 555 configured as an oscillator. IC-1 - Motorola MC-1374P. IC-2 - National LH0002C. L1, L2 - Mouser Electronics #421IF200. C1. C2 - Silver mica, 300 pF. All 0.1 uF cap., ceramic disc, 16V. C3 - 100 uF, 10 V,....
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Electric locos derive tractive effort from Traction Motors which are usually placed in the bogie of the locomotive. Usually one motor is provided per axle but in some older generation of locos two axles were driven by a single Traction Motor also. However....
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I have found this circuit to have better sensitivity, both in distance to a visible bat and in audio frequency, than some other published circuits using a 40kHz transducer with 4000x gain amplification, though the 40kHz transducer I used for the comparison....
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Both resistive and capacitive type capacitor discharge circuit is the use of the method of strong excitation. Capacitor C capacity, the longer the strong excitation time. ..
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An electronic speed control for an AC Motor can be
designed with a Light Dimmer IC by limiting the minimum
firing angle of the triac so that the motor wont
stall. This can be done effectively for high volume applications
by making a minor change to the....
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Using a single 555 Timer IC and a small transformer to generate a high voltage, this circuit will test zener diodes of voltage ratings up to 50VDC. The 555 timer is used in the astable mode, the output at pin3 drives a small audio transformer such as the....
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The astable multivibrator I found in wikipedia and also my college material are the same, which is on the left hand side of the picture. While for the schematic at the right hand side, I found it from the example of LTSpice. I would say because it`s drawn....
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A phase-shift audio oscillator with excellent distortion characteristics thanks to "softened" diode limiting provided by the 1N914 and resistor divider and degenerated gain provided by the 68 ohm emitter resistor. For minimum distortion, increase the 68 ohm....
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A wide variety of low power wireless communication systems have surfaced in recent years. Automotive keyless entry, home security, bar code readers, and child monitors are just a few of the many applications for this technology. Most low power wireless....
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This ac to dc power supply can output 5A in continous operation and 12A peak current. This kind of dc power supplies uses a PCB so you can use two case typ...
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Side tone coupling:In telephones, it is the hearing of one`s voice in the receiver when one speaks. Too muchside tonemake people speak lower and can cause feedback. Too littleside toneand people may think the phone is not working or may shout. Figure This is....
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In the circuit, a quad voltage comparator (LM339) is used as a simple bar graph meter to indicate the charge condition of a 12 volt, lead acid battery. A 5 volt reference voltage is connected to each of the (+) inputs of the four comparators and the (-)....
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The diagram is human infrared remote sensing lamp circuit. It uses trace infrared heat sent out by human to remote control the open or close of lap. This human infrared remote sensing lamp trigger sensitivity is very high ( can work in 10m distance),....
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The major disadvantages of usual linear power supplies are high power dissipation, the size and the appropriated weight. When looking for an alternative solution, I decided to use a switch mode power supply (SMPS). The efficiency of such power supplies is....
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transistors as a darlington pair. The circuit is also using a thermistor to detect or sense the heat. A 12K variable resistor is used to adjust the activation of the buzzer on the desired temperature. Working of the circuit is simple when the thermistor will....
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ML2011GD/ML2011HB is MP3 decoder LSI easily used. Besides the MP3 decoder, it integrates stereo DAC and 8 © 650mW drive speaker amplifier that allows MP3 playback function only by building this LSI into the application...
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40kHZ ultrasonic transmitter circuit of five, by the time base circuit LM555 and the external components 40kHZ multivibrator circuit, the resistance adjusting resistor RP can c..
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In Circuit Transistor Tester Schematic Here is a circuit that can indicate the condition of a transistor by using two LEDs. A good NPN transistor...
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This circuit is used to sense the insertion of a penny. Before the penny is inserted, current is flowing through the detector (transistor) side of the optointerruptor, and Port M5 is HI. When the penny blocks the optointerruptor, Port M5 goes low. The hex....
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Sending Morse on a rig without a sidetone is not impossible, but is not particularly pleasant either. This battery-powered monitor has been designed to provide an audible indication of keying for those whose rigs lack a CW sidetone. Its sensor wire is....
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I`ve been visiting local convenience store (Dollarama, here in Montreal, Canada) and notice nice looking FM Radio, just for only $3. Why not to try to interface it to my lovely Arduino Idea looks quite challenging, the same time what is the point in....
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The losses in a bridge rectifier can easily become significant when low voltages are being rectified. The voltage drop across the bridge is a good 1. 5 V, which is a hefty 25% with an input voltage of 6V. The loss can be reduced by around 50% by using....
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LEDs are available in a number of different sizes and shapes with most being round topped cylinders that are either 3 mm or 5 mm in diameter. These sizes are also commonly referred to as T1 (3 mm) and T1 (5 mm). The body of most LEDs is made of plastic that....
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This is a circuit monitoring device. It runs for over 10 days and can log up to 32k events both digital and analog. Samples are logged either on a timing basis (.01 to 2.5 seconds), or on a triggered basis. Four inputs are provided, up to three of which can....
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The following circuit is PC thermometer using DS1621. Feature : plug in any free PC com port, range of -20 to 125°C, Centigrade (°C) of Farenheit (°F) scale, basic accuracy and resolution 0.5°C, readable data log, sampling rate 1, 5, 30 or 60 seconds, basic....
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Radio Control Circuits Pdf Manual PDF Download...
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This application note describes an application of the MAX2361 quadrature transmitter IC in the Korean PCS band (Tx = 1750-1780MHz)....
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PCA84C-440/441 is the single-chip microcomputer integrated circuit produced by Philips company, it is widely used in domestic and imported large screen color TV, such as Philips and other color television.1. The internal block circuit diagram and pin....
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This random timer circuit is based on a Atmel ATTINY24 avr driving one power relay. You can use this circuit to switch on and off other circuits randomly. For example, when using this circuit on a model railroad you can turn on and off parts of the animated....
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The safety shutdown and fault isolation protocol are critical in many telecommunication, industrial, data processing system and industrial. To share data....
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The frequency to voltage converter circuit illustrated in the schematic diagram below produces a 10 V output for 10 kHz full scale input (square waves or pulses). The simplicity of the circuit doesn`t mean a bad performance: this circuit has linearity about....
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Single-phase rectifier DC welding power load from road circuit is shown. Contactor KM use CJ20-40A, 220V. Adjustment potentiometer RP, ensure arcing , the relay KA2 reliable release...
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This circuit, connected to 32 Ohm impedance mini-earphones, can detect very remote sounds. Useful for theatre, cinema and lecture goers: every word will be clearly heard. You can also listen to your television set at a very low volume, avoiding to bother....
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A circuit using a keypad, a servo and a few LED`s. This was connected to my Arduino Uno. Now I tried putting everything onto a single PCB and thus building my own custom "Arduino" into it. The red LED is supposed to shine and the servo must move to a certain....
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This circuit can detect smoke and a number of gases (CO, CO2, methane, coal gas and others) with a 10 ppm sensitivity. It uses a heated surface semiconductor sensor. Detection occurs when the gas concentration increase causes a decrease of the sensor element....
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While driving car the gauges goes off and the car stall immediately. Car will not start until gauges come back on. While gauges are off the car starter will turn over the motor, but will not start. First time about 5-10 minutes before gauges are back on and....
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This circuit runs a fast battery test without the need of power supply or expensive moving-coil voltmeters. It has two ranges: when SW1 is set as shown in the circuit diagram, the device can test 3V to 15V batteries. When SW1 is switched to the other....
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This circuit produces the famous Big Ben sound. It produces the "ding dong" sound when switched ON.
Basically the circuit alternates between two frequencies which are adjustable. This produces the "ding-dong" sound.
The first IC(left) oscillates at about....
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I got myself a Super GameBoy today, but I noticed that the sound pitch is notably higher than an original GameBoy(CPU clock frequency doesn`t match between the Super GameBoy and GameBoy "Brick," 4.194304 MHz for the "Brick" and 4.295454 MHz for the Super....
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Readers who do not care to modify the power supply of an old PC into a suitable halogen power source (see our April 2006 issue), may find the present design a welcome alternative. The circuit does not need any changes to the power supply. It allows the....
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The 10k resistors in question are R15, 17, 18, and 19 (R16 is somewhere else). Their purpose is to separate the input channels, because otherwise turning the volume control for one channel down to zero would also connect the output signal to ground, cutting....
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The easy way to clamp a signal to a given value is to use two zener diodes, connected back-to-back. This method has several disadvantages. The accuracy of the clamping depends on the tolerance of the zener diodes, and the clamping is not adjustable, except....