Popular Circuits Page 251
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This Project is used to indicate the temperature and it is also used as controller. The system will get the temperature from the DS1820 and it will display the temperature over the LCD display. There are 2 preset levels, one is low preset and the other is....
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The 27MHz crystal oscillator circuit is as shown in the figure. The R1, R2, R3 are the biasing resistor, the C6 is the bypass capacitor, the voltage division circuit is composed of the C1, C3, C4 and C2 to control the oscillation strength. The L1 is the....
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This system can be used with 4-, 6-, or 8-cylinder automobiles. The timebase formed by IC5 is an oscillator th..
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Transistor Ql is a light-activated silicon-controlled rectifier (LASCR). The gate is tripped by light entering a small iens built into the top cap. To operate, provide a 6-in. length of stiff wire for the anode andcathodeconnections and terminate the wires....
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Variable resistor R1 adjusts the light threshold at which the circuit triggers. R1`s value is chosen to match the photocells resistance at darkness. The circuit uses a CMOS 4001 IC. Gate U1a acts as the trigger, U1b and c form a latch. S1 resets the circuit.....
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When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resistor(arbitrary) and the phototrans drops from VCC to lower values. When the voltage drops lower than VCC/3 the 555 is triggered and goes high (from 0 TO VCC).....
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The circuit has two ranges: 10 sees to 5 mins and 1 min to 80 mins. It can be powered by a 9-V battery. With the LED connected as shown a reasonable frequency of flashing occurs throughout the range of operation. ..
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Gadget Master brings you the latest news on capacitance-circuits in our round-up of capacitance-circuits projects and websites for electronics designers, scientists and engineers ..
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This project creates a RGB LED lit love heart which is controlled by a PIC12F683 microcontroller. I designed the project as a gift for my wife on our 15th wedding anniversary (since she puts up with my addiction to electronics I thought she deserved....
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DC motor speed controller circuit, applies two timers connected as a Pulse Width Modulator. The chip put into use will be an nmos dual timer/oscillator NE556..
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The positive feedback comparator circuit increases the gain ofthe op-amp, which helps to switch very fast between the two states of a multivibrator. The positive feedback also provides hysteresis to the circuit. A capacitor `C` is connected to the inverting....
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The digital clock of circuit, has as base one IC, the MM5314N, in which are contained all the circuits that need. The IC1 collaborates with six Display of common anode, that are not critically as materials. You can select what dimension, you want it is....
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Zender diode to do the over-voltage protection, this issue might be solved. Am I right or I need to do another thing to protect it. Please give me any advice. A zener diode will help if over-voltage on VDDA if that is the cause of the failure, but with a 12V....
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This circuit warns the user against fire accidents. It relies on the smoke that is produced in the event of a fire. When this smoke passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This causes the resistance of LDR to....
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Which type of modulated light receiver should one use A photodiode straight into a high gain, high impedance amplifier A photodiode into a current amplifier A back-biased photodiode FET input or bipolar IC or discrete How does one minimise noise while....
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96 Cad De ville which has been separated at the A-Pillars and just behind the windshield. I have the front end with all mechanicals in tact, I have....
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As the figure 15-22 shows, the doorbell is composed of the monostable timing circuit, the password switch, the NAND gate circuit and the sound circuit.etc. In the limited time, the circuit uses the program to press the password switch, the doorbell circuit....
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Charging a Small NiMh Battery has devised an ingenious way of collecting energy from the air and using it for various useful purposes like for charging small 9v NiMh battery, or for making high voltages etc. The experiments are indeed very intriguing and I....
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When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The....
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This inverter will drive any fluorescent lamp between 8w and 20w but works best with 16w tubes. It preheats the electrodes and keeps them heated while....
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Adjustment potentiometer RP, can change the thyristor Vl, vz conduction angle, thereby changing the applied voltage across the load Rfz size. ..
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Application of automatic plotters for measuring solar Schottky gate capacitance - voltage characteristics. Measured diode connected as shown below. IC square wave output phase,..
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Schematics for an 80W electronic ballast to drive 2 48"" lamps....
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This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like its shown in the table (from 20 W to 80 W RMS)....
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As is shown in the picture, the Pulse Demodulator is composed by CMOS Hex Inverter. This circuit can be used to process envelop detection on Amplitude Pulse....
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ZXLD1100 is a PFM flyback DC to DC boost converter that work in discontinuos mode. The following circuit diagram show you about setting 4 LED Driver for Handset LCD Backlight using this device. The ZXLD1100 designed for driving 2,3,4 series connected white....
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The input transformer is likely to be the most expensive part of the entire project. As an alternative, a couple of 12 Volt car batteries could be used. The input voltage to the regulator must be at least several volts higher than the output voltage (12V) so....
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You can use a Cmos 4001 or a Cmos 4011 in this circuit. They have four - two-input - gates. In each case - the two inputs are joined together. So the gates are being used as simple inverters. = This means that when the two inputs are high - the output will....
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This circuit can be used to check the operation of your servos, check for full travel, binding and "drag" or rubbing when the servos are installed in your model, or even be used as a control circuit in a robotics project. PARTS LIST: IC1 = LM555 Timer (or....
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This audio amplifier designed uses two LM3886 per channel, in parallel circuit, based on the PA100 parallel amplifier detailed in National Semiconductor`s application note - AN1192. This amplifier can deliver about 50W into a 8-ohm speaker and 100W into a....
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Is using a dimmer HT7700A ASIC production keyed stepless dimming lights, make use SB single button control, dimming the brightness has 96 changed. HT7700A scale using CMOS process is made using standard D1P-S-pin package. Preparation of the pin cylinder....
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This post assumes some knowledge of PCB etching methods and is an account of my experience with the toner transfer method. If this is new to you, you may have to get Googling on a few of things mentioned here. That said, I`ve linked to the sites I found most....
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circuit 1kz has an op amp component type with two inputs, output, and up and down ports, usually used for power supply rails. There`s also a buffer component type (which I think is provided by tikz itself, not the circuitikz library) which has one input and....
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Here is a simple circuit that will produce a musical horn when ever your car is in reverse gear. The circuit uses two ICs for the operation, voltage regulator 7805(IC1) and musical tone generator UM66(IC2). The IC1 reduces the car battery voltage to 5V. The....
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The following circuit shows about Alarm Power Supply Circuit Diagram. Features: 1-amp current, suitable for the Modular Burglar Alarm, 12-volts ....
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Vegetable greenhouse temperature detection control circuit Greenhouses temperature detection control circuit, it is mainly by the ..
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The two circuits illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay is closed when the voltage at the diode anode rises to 12 volts..
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The control of electric motors is something which interests nearly everyone involved with Meccano model building. Every model has its own motor requirements with regard to the space available, the power of the motor, its speed, whether it must stop and start....
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Feedback has shown TDA6120Q factor 1/83 test circuit shown in Figure. Input signal Vi composed by Ra, C10, C11 input into the network TDA6120Q 2 feet, 2 feet and 4 feet are ins..
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This circuit can be used to delay other appliances connected to the output of the relay. After working set To prevent equipment damage from...
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This circuit allows you to equlize the audio signals in ten band. It uses low cost op-amps to form a professional equalizer circuit. The heart of the design is a classical band-pass active filter. The U11 acts as an attenuator to prepare the signal level for....
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The fixed voltage power supply is useful in applications where an adjustable output is not required. This supply is simple, but very flexable as the voltage it outputs is dependant only on the regulator and transformer you choose. The maximum output current....
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We have developed a powerful yet inexpensive and easy to construct experiment control system. The construction of the system together with the control software is described here. All circuits and software are free to download and use for nonprofit. The....
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Figure 1-1 The general-purpose timer once timing of 5 minutes to 18 hours; the timing cycle from 5 minutes to 20 hours; the total time of the timing and the timing to open and ..
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A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. Only one resistor is needed to set the desired charging current and is calculated by dividing the difference in battery voltages by the charge....
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Darlington phototransistor constituting the photoelectric function with self-locking control relay circuit: ..
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The wireless light switch circuit described here requires no physical contact for operating the appliance. You just need to move your hand between the infrared LED (IR LED1) and the phototransistor (T1). The infrared rays transmitted by IR LED1 is detected....
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there are countless applications for use of this hardware. Touch pad, proximity sensors, readout of capacitive sensors, extreme precision capacitance measurement, ultra small capacitance change detection, soil moisture, skin moisture measurement are just....
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1999 suburban, head lights do not work. checked fuses and circuit breakers, they are fine. In the owners manual it says headlamps are protected by a circuit breaker in the lamp switch, but of course it does not bother to tell you where to find it Hmm. That`s....
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This is an actual reverse engineered circuit diagram of the one transistor circuit most commonly used to drive Permanent Magnet DC motors in childrens` toys. This type of circuit almost always uses the 625mW version of the ubiquitous 8050 or 8550 transistor.....
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Hi Everyone out there! I am new to microcontrollers. I am using AT89C55WD to control H-Bridge (L298) which in turn drives the DC motor. Circuits for....
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When the water-level is below the steel rods, no contact is occurring from the metal can and the rods, which are supported by a small insulated (wooden) board. The small circuit built around IC1 draws no current and therefore no voltage drop is generated....
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I used the components on hand, comprehensive reference ..
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This power supply is designed for amateurs, and has been in operation for over 10 years. Its design is very simple and practically immune to RF. It brings together the individual pieces, is the most expensive part of 600VA toroidal transformer, which can be....
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The two circuits illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time periods where the push button can be pressed and released before....
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Sine wave oscillator can be implemented using Wien-Bridge oscillator like in our previous sine wave oscillator circuit, but now we present another method of...
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We have designed a walkie cardiotachometer, it can substitute and carry on the metric classic method with pulse auscultator, etc. , it is very convenient to use. This product mainly includes three parts: Collection, data processing and LED of the signal....
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Ensure that the 12V(yellow) wire is connected to the right of the D-connector(as seen from behind, i. e the connector holes away from you with the curved portion of the connector upwards) Disclaimer: All the information present on this site are for personal....
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All electronic systems and equipment regardless of their size or function have one thing in common: they all need a power supply unit (PSU) that converts input voltage into a voltage or voltages suitable for their circuits. The most common type of today`s....
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Although the TDA2030 is capable of delivering 20 watts of audio power, I deliberately reduced the output to about 8 watts to drive 10 watt speakers. This is more than adequate for a smaller room. Input sensitivity is 200mV. Higher input levels naturally will....
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This project displays telephone numbers decoded from tones. A microphone picks up the tones, a preamplifier boosts the signals, an SSI-202 DTMF chip decodes the tones, a Basic Stamp acts as an interface to an LCD display and also provides "RS-232" serial....
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A sensitive radiation monitor may be simply constructed with a large-area photodiode and a quad operational amplifier. Replacing the glass window of the diode with Mylar foil will shield it from light and infrared energy, enabling it to respond to such....
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Learn implementing I2C on 8051 PIC and AVR microcontrollers. Here you will find codes and examples for using I2C library....
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The IR diode"s flash rate is determined by the value of CI, a 220-Â¥ capacitor that sets the rate of oscillation at 1 ..
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It uses multi-vibrator 555 consisting of an integrated circuit, the oscillation frequency Ri,..
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This meter circuit uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The input voltage can vary from 12V to 20V, but suggested voltage is 12V. The LM3915 is a monolithic integrated circuit that....
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LM311 is the integrated chip within reference voltage, comparator circuit, amplifier, discharge circuit, and it is easy to use. In the circuit, the output frequency f0 is....
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With just a low cost DC adapter and the circuit described here it is possible to build a low cost stabilized, uninterruptable 9V supply. On the grounds of safety and economy, a simple unstabilized 12V D. C. adapter is used as the power source, a universal....
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An oscillator is a circuit that can generate a frequency source such as a sine wave, square wave or pulse train. An oscillator is fundamentally a combination of a frequency-sensitive circuit such as an LC circuit or a crystal and a negative resistance....
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The 22 turn coil is on top of the 84 turn coil. It makes a difference having this coil connected. I have tried with a 1kw heater and worked better but if I leave it on for too long I am sure it will blow it too. The wire in the heater normaly is not as....
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This is a simple alarm circuit which produces a musical tone when water or some conducting liquid comes in contact with the two sensor wires provided. The circuit is based on four transistors and one melody generator IC (M 3482). When water comes in contact....
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This counter uses a four-digit display, but with a flip of the range switch, it can display frequencies from 1 to 40 MHz, with a resolution of 100Hz. The MM74C926 CMOS IC contains a four-digit decimal counter that can latch a given count and then use this....
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It is sometimes necessary to monitor a device that generates a relatively short pulse to indicate a change of status. If the duration of the input signal is too short, the RFC-1/B may not have time to capture the pulse and respond appropriately. The RFC-1/B....
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This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
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The control circuit in Figure 1 senses a given load and automatically soft-starts the load by synchronously adjusting the power to that load. You can also manually adjust the power delivered to the load by controlling the phase angle of the line voltage....
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The D169 serves as a level detector and provides complementary outputs. The op amp is used to integrate the input signal Vin with a time constant of R1C1. The input (must be negative) causes a positive ramp at the output of the integrator which is summed....
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The IC produces all the sound effects, the output at Pin 3 being amplified by the transistor. A 64 ohm loudspeaker can be substituted in place of the 56 ohm resistor and 8 ohm loudspeaker. The 2 pole 4 way switch controls the sound effects. Position 1 (as....
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The TDA2040 is a monolithic integrated circuit in Pentawatt package, intended for use as an audio class AB amplifier. Typically it provides 22W output power (d = 0. 5%) at Vs = 32V/4. The TDA2040 provides high output current and has very low harmonic and....
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Security is a prime concern in our day-to-day life. And access control system forms a vital link in a security chain. The microcontroller-based digital lock presented here is an The microcontroller-based digital lock presented here is an access control....
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Today, we share a principle circuit of electronic games. The main circuit in accordance with the host through the IC2 reset press SB2, VD1A-VD9A not light. Prizes (for example 5) Which position by the number of people pointing Dot Award, the host closing the ..
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This is a design circuit for Low Distortion Crystal Oscillator circuit. This circuit generate a sine wave that has low phase noise and distortion. This circuit can be used to perform a crystal with less than 1mV dissipated in crystal. The crystal is used to....
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This color changer mixes light from high-power LEDs to create more than 16 million colors. A smooth auto-fader cycles the colors, or you can hook it up to a USB port and control it from your computer. This color changer borrows a well-known color model used....
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