Popular Circuits Page 200
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Using TEA5551T monolithic integrated radio circuit can be designed a AM radio receiver circuit which is designed for use as a portable radio receiver with headphones. The TEA5551T radio receiver circuit contains all is needed for a AM radio receiver circuit....
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without significant added complexity, and a natural tendency to run away under no-load (high Q) conditions. The 20-kHz control circuit (see Fig. 2) overcomes these shortcomings hy feeding back into the asymmetrical thyristor trigger pulse generators (see....
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This circuit is used to maintain the level between two fixed points. Just transform K1 contacts off the case, it can be filling or extraction work in two ways. Load can use AC motor or solenoid-operated valve. The liquid level is detected by the two probes....
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The circuit presented here is intended for charging NiMH batteries. The MAX712 IC used here contains all the necessary functionality to make sure that this happens in a controlled manner. Figure 1 shows the schematic of the charger. The heart of the circuit....
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MM5314 a monolithic MOS integrated circuit that utilizes P-channel low threshold, enhancement mode and ion planted, depletion mode devices which has features such as internal multiplex oscillator, fast and slow set controls, single power supply, 7-segment....
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Next to SCR, the triac is the most widely used member of the thyristor family. In fact, in many of control applications, it has replaced SCR by virtue of its bidirectional conductivity. Motor speed regulation, temperature control, illumination control,....
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This low current relay circuit is designed to be used in battery operated electronic devices. Its operating current is in micro amperes ( µA). This is done by using a bistable relay and adding some components to force the relay to behave like a monostable....
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Walky-talky in this website is world first verified project made without using any coil range up to 500M circuit diagram of walky-talky with description walky-talky is communication ...
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This application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, testing systems separately....
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All LEDs require some form of current limiting. Connecting an LED directly to the power supply will burn it out in a heartbeat. Overdriving, even briefly, will significantly reduce it`s life and light output. Fortunately, driving a single or a string of low....
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In this document is a simple calculator and PCB circuit board wiring diagram, simple, interested students can design their own!..
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Changing to a 3-prong AC cord is pretty much an expected upgrade or mod, as is replacing the filter capacitors. Changing the coupling capacitors to Orange Drops or some other boutique brand is also accepted, and often adds to the hyperbole in eBay auctions.....
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The following circuit can be used to detect those annoying piezo whistles that one can get from Radio Shack. For the Trinity Home Fire Fighting Contest, additional points accrue when the robot is started by a sound similar to a fire alarm. The actual....
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Infrared alarm system is the use of infrared LED emits invisible light, when the light is blocked by the body, namely the police. It consists of an infrared light emitting circuit and reception circuit ..
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This TMOS VCO operates in push-pull to produce 4 Wot 70 MHz. It consists of two MFE930 TMOS devices in a balanced VCO that generally provide better linearity than the single-ended types. Varactors are not used because the design takes advantage of the....
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PWM waveforms are commonly used to control the speed of DC motors. The mark/space ratio of the digital wave-form can be defined either by using an adjusta....
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The Hartley Oscillator is a particularly useful circuit for producing good quality sine wave signals in the RF range, (30kHz to 30MHz) although at the higher limits of this range and above, The Colpitts oscillator is usually preferred. Although both these....
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This crystal oscillator is designed to operate with fundamental crystals with less than 1 mW dissipated in the crystal. The signal current is filtered by the crystal and develops a voltage across a capacitor with about 500 ohm of reactance. The resulting....
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Eggs hatch chicks temperature requirements within 36 ~ 39oC temperature range, temperature sensor integrated circuits using TC621 temperature control circuit, having fewer exte..
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Controlling a relay with stm32 micro controller. For the isolation I have used a 4N33 opto-isolator. As my relay coil needs around 250 mA, I used a mps222 transistor. I figured that the logic gets inverted when I used the gpio as the source voltage for the....
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This instruction shows how to convert a standard microscope with light bulb to LED light. Only a cheap mobile phone charge can be used as the power supply because of the much lower power consumption of the LED light. Defective original power supplies do not....
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As part of the National Instruments Tinker, Learn, and Do Engineering with NI myDAQ course ware, the hands on experiments demonstrate the wide range of possibilities of using NI myDAQ hardware. The 10 lab experiments cover a wide range of topics including....
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The following video is of my test circuit of a 16 step analog sequencer based on Mauno Tuominen`s schematic for an analog CMOS sequencer based around at 4067n multiplexer/demultiplexer. You can see a DIY version of the sequencer here at studiomanus. com. I....
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It sounds rather mysterious: a switch that is controlled by its ambient temperature. All without the touch of a human hand, except for when you re building this sort of electronic thermostat. There are a lot of handy uses for a thermally controlled switch.....
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This circuit shows a car audio amplifier with TDA7381 IC. With the Tda7381 audio amplifier IC we can design a very simple 4x25 watts car radio ....
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This is a simple circuit of magnetic pickup phono preamplifier. A proper loading to a reluctance is provided by this circuit. Here is the circuit: The gain....
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The small single turn magnetic loop (SSTML) antenna consists of a single winding inductor, about 3 feet (1 meter) in diameter, and a tuning capacitor. A second loop, which is one fifth of the diameter of the large loop, is connected to the feedline and this....
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Pulse telephone 160 168 controller circuit is shown as above, the controller can be installed on the phone or on the switchboard of the trunk. It can effectively prevent the others to freely dail 160, 168. D1 ~ D4 use 1N4004, the rest diode use 1N4008. Q1,....
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The enable signal for USB chip and GLCD controller were made by PLD decoder from the address lines. As we have seen the memory map for i/o of 8051SBC board, the available space is from 0x0300-0x07FF. The address range of 0x0300-0x03FF was used for USB chip....
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Many enthusiasts will be using their PCs as data loggers, controllers or as web servers. ln these cases it is important that the machine is kept powered up for as great a fraction of the time as possible, even if there has been a power cut or if the power....
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This device adopts encoding and decoding circuit MC145026/ MC145027 and RF transmitter / receiver module TDA1808/ TDA1809, and it can beflexibly operated inthe range of 10~120m, and people have no need to change orginal mouse eterior apperance and inside....
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When a new computer modem enters the household, the demands on the home phone line skyrockets. The Internet surfer can use phone time on a par with the most talkative teenager. And the computer modem user can be quite sensitive about his privacy: simply....
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The LMD18200 is a 3A H-Bridge designed for motion control applications. The device is built using a multi-technology process which combines bipolar and CMOS control circuitry with DMOS power devices on the same monolithic structure. Ideal for driving DC and....
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The alarm is built around two audio oscillators, each using two NAND gates. The detection oscillator is gated on by a pair of remote probes. One of the probes is connected to the battery supply, the other to the input of one of the gates. When water flows....
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This is the circuit diagram a powerful LED flasher. High power LEDs are very common in the market now and a 1W high power LED is used here. Transistors Q1 and Q2 are wired as an oscillator which produces positive pulses of width 20ms @ ½ Hz. Transistor Q3....
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The circuit will regulate the rms output voltage across the load (a projection lamp) to 100 volts ±2% for an input voltage between 105 and 250 volts ac. This is accomplished by indirectly sensing the light output of lamp LI and applying this feedback signal....
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The Colpitis sinusoidal oscillator provides stable output amplitude and frequency from 0°F to +150°F. In addition, output amplitude is large and harmonic distortion is low. Oscillation is sustained by feedback from the collector tank circuit to the....
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Also called the parallel A/D converter, this circuit is the simplest to understand. It is formed of a series of comparators, each one comparing the input signal to a unique reference voltage. The comparator outputs connect to the inputs of a priority encoder....
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Capacitance Meter Circuit Using 555 It directly reads capacitance in the range 100pF to 10µF. IC1 and IC2 operate as an astable (with frequency....
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This is a two-way can set the alarm circuit which uses a Schmitt IC, with responsive and sound and light show, small size, low power consumption, all of the elements is only 13, a very low cost. This circuit is divided into two parts by the A, B and R4,..
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Sensing short circuits in equipment that performs under water is especially critical, but Fig. 20-4"s wet-mat..
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Your 5x7 display is my favourite toy; the tunes and graphics in the elevator display always impress my mates!
Since building the display I developed my own 400 dot matrix using a pic and the SN74154 [4bit binary to 1 of 16 demultiplexer\counter] - in place....
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A very simple electronic key code lock circuit that require few external components can be constructed using this schematic diagram. This electronic key code lock circuit is based on a common 555 timer circuit and some other common components. This low cost....
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As shown in FIG grounds ISO122P/124 and loop current transmitting circuit XTR101, isolated RTDs loop current configuration of the receiving circuit RCV420 4 ~ 20mA loop detecti..
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IC H Bridge DC motor driver L298 has two H-Bridge circuit in it, so it can be used to download the drive two DC motors. H Bridge DC motor driver L298 each can deliver currents up to 2A. However, in use, the H Bridge DC motor driver L298 can be used in....
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A microphone preamplifier using: om CMOS op amp with its own battery, is small enough to be placed in a case of small microphone. The amplifier operates from a 1.5V battery cathode mercury low supply currents. This preamp will operate at very low power and....
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The Wien bridge sine wave oscillator to introduce is the oscillator which works in the oscillation by returning(positive feedback) the oscillation output to the input. The point of this circuit is the negative feedback circuit to make the oscillation....
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The chicken male and female discriminator circuit is composed of the audio detection circuit, active band-pass filter and LED display circuit, and it is shown in Figure 4-11. Audio detection circuit consists of piezoelectric ceramic BC and resistor Rl, R2.....
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Affected by environmental interference by = to transfer switching Confidence disgrace will produce burrs. Switch position signal will control the computer system with lanthanum burr reliability..
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Using this low cost Project one can reproduce AUDIO from TV without disturbing anyone. It does not use any wire between TV and HEADPHONE. In place of pair of wires it uses invisible Infrared light to transmit audio signals from TV to Headphone. Without using....
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Make a little buzzer for my bike to sound occasionally to warn off bears. I have a 12V buzzer from Radio Shack (Cat. No. 273-065) and was wondering if I could run it off of 18V directly (2x9V Transistor Batteries series) for 1-2 second bursts, or if I should....
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Make H-Bridge for controlling DC brushed motor with PWM. One bridge will control 1 DC motor. Bridge will have 3 inputs: A, B and PWM. A and B will be direction control while one PWM signal will control motor speed no matter in which direction it will spin.....
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This is the square wave oscillator which used a CMOS-type logic inverters. I use the word "logic inverter" to avoid confusion with the DC/AC inverter. The output of the oscillator is connected with the drive circuit through the logic inverters. The antiphase....
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Remote control circuit consists of two parts, one is transmitter and the other is receiver. A simple diagram is schematic remote control. The transmitter circuit`s transmitter IC is controlled by NE555. Receiver circuit works by the signal emitted frequency....
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This is the circuit diagram of DC voltage doubler / DC converter. The circuit will convert 12VDC power supply to become a 24VDC at and 18VDC. Almost any PNP or NPN power transistors should be work for this circuit...
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When this circuit is turned on, the natural offset of the devices serves as an automatic starting voltage. Assume that ..
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Build your own Accurate LC Meter (Capacitance Inductance Meter) and start making your own coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors. LC Meter can....
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FS810 practical circuit as shown for the integrated power amplifier. FS810 is a high performance, integrated power amplifier for high-end tape recorders and audio equipment. Fi..
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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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Fluorescent tube is connected in the LC resonant circuit composed of L2 and C9. Bidirectional breakdown diode VD4 is starting circuit. When AC power is connected, VT2 gate potential increases by VD4; when the voltage exceeds the gate threshold voltage, VT2....
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Air-cored inductor L1 consists of 13 turns of 1mm dia. enamelled copper wire with an inner diameter of 10mm. The completed inductor is pushed over R7 and its terminals soldered to those of the resistor. All electrolytic capacitors must be mounted upright.....
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The HCS12 series of microcontrollers does not support dedicated internal digital-to-analogue conversion hardware, and thus external hardware, perhaps in the form of a digital-to-analogue conversion IC...
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The following circuit shows about Devantech SRF04 UltraSonic Sensor To The SV203 powered PPRK Circuit Diagram. This circuit based on the Devantech SRF04 sensor. Features: minimum of 10m sec to initiate the sonic pulse ( the trigger), fairly simple, held low....
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This is schematic diagram of a video amplifier circuit, built based very high speed opamp IC LH0032. Parts List: R1 = 15K ©+15K © R2-3-4 = 10K © R5, R6, R7, R8, R9 = 1K © R10 = 820 © R11 = 1M © R12 = 100 © trimmer R13, R14, R15 = 47 © R14 = 10K © C1 = 10uF....
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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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An analog-to-digital converter is a device that converts a continuous quantity to a discrete time digital representation. An ADC may also provide an isolated measurement. An analog or analogue signal is any continuous signal for which the time varying....
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Provide your radio with a actual cord signal, again acclimatize the HIGH LEVEL pot to the beginning of anecdotic the aftermost LED (all LEDs on). Remove the arresting completely, again acclimatize the LOW LEVEL pot to the beginning of no LEDs illuminated. If....
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The YD7312 is a monolithic integrated circuit designed for dual pre-amplifier circuit with ALC for recording/playback Amplifier of cassette tape recorder. By Wuxi Youda Electronics Co. , Ltd. ..
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The trip point is set half way between the supplies by Rl and R2; R3 provides over 200 mV of hysteresis to increase noise immunity. Maximum frequency of operation is about 300 kHz. If response to TTL levels is desired, change R2 to 39 K..
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In the work process analysis circuit diagram, for example, and use of work in flyback converter transformer model. Flyback transformer is mainly composed of ideal..
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A frequency modulator configured NE566 integrated voltage-controlled oscillator shown in FIG. When the signal input terminal potential DC position, forming a cycle of constant ..
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The 22 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers. The circuit is quite compact and....
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Any vacuum-tube oscillator configuration has an equivalent transistor circuit. For example, consider the vacuum-tube oscillator, illustrated in Fig. 6-1 (A), which represents one form of Hartley oscillator. Positive feedback is accomplished by arranging the....
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The choice of material to read or drive is the definition of three digits (Bit), RA0, 1,2 PORTA of the PIC at the entrance of 74HC138A. To select a material for reading or driving an output of 78HC138 is '0 '(Low), forcing the transistor (2SA1015) to conduct....
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This 1 Hz and 2Hz generator or oscillator is built with 4060 as an oscillator and a 14 bits counter. To obtain a 1Hz signal after 4060 we use 1/2 4013. This circuit provides a rectangular voltage with a amplitude between 0V and the power supply voltage...
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As shown on the figure 11-6, the fishing circuit consists of timing circuit and audio circuit. 555, RP1 and C1 make up the single shot circuit. The definite time: td=1.1RP1C1. The maximal definite time given by the figure is 15s.IC2 adopts the muisc....