Popular Circuits Page 154
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This circuit is based on a preprogrammed multi-instrument melody generator IC, containing a 512-note memory capable of generating 16 tunes. The comprehensive control facilities enable playing - all tunes repeatedly or stopping at the end, - or one tune....
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A long time ago when telephones were so simple almost nothing could go amiss from an electrical point of view, Telecom operators installed surge protection on all telephone lines exposed to storm risks. Paradoxically, now that we are hooking up delicate and....
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The oscillator that is composed of the quartz crystal can be divided into two kinds: the parallel resonant type crystal oscillator and the series resonant type crystal oscillator. The parallel resonant type crystal oscillator and the AC equivalent circuit of....
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The transistors Q1, Q2, Q3 and Q4 form the bridge circuit. Generally these are power transistors capable of handling high current. Q5 and Q6 drive the bridge. when the `A` is made high and `B` low, transistor Q5 is on and it makes Q1 and Q4 on. The current....
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If you ever wanted to integrate RFID functionality into your project, this small tutorial might help you accomplish that. I used the RDM630 module from seeedstudio in its UART version. It comes on a small board with presoldered connectors which fits....
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A useful timing strobe can be constructed using high-brightness LEDs and a few common components. Ignition pulses from the number 1 cylinder high-tension lead are used to trigger the circuit via a home-made inductive pickup. Transistors Q1 & Q2 buffer and....
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This project was used to introduce a friend of mine to microcontrollers and circuits. I wanted something that used a variety of microcontroller functionalities and used only parts that I had lying around. I ended up using a PS2 numpad as the key entry....
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During normal' 'hold'' mode, the replicated analog voltage is buffered straight through the S/H amplifier to the output. Upon issuance of a SAMPLE signal, the S/H amplifier is placed in the hold mode, holding the voltage until the new analog voltage is....
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If you are a hobbyist or a professional electronic engineer who make many electronic experiment, troubleshooting, or testing, providing wide range variable...
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Provide zero crossing detection to my controller. Using the schematic below, I managed to generate square wave signal, representing positive v/s negative half-period. The problem is that the resistor needs to be quite large : Quite the heater. Also, voltage....
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This small water sensor alarm circuit makes a loud warning sound when a humidity sensor detects a quantity of water. This circuit assembly is an application of low power comparator LM1801 made by National Semiconductor. The reference voltage for the....
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Video-DVM is a very cheap DVM that shows how an output as complex as a videocomposite signal can be generated entirely in software: two I/O pins and three resistors are all the hardware required. Connected to any TV set it displays voltages, included max and....
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As ZKJ-S-type buffer controller circuit for motor starting slip control. Buffer controller by the two operational amplifier Ai and Az composition. Ai constitute a speed amplifier saturated, Az constitute an..
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One of the primary things i wanted to do with my Arduino was turn my generators into motors. My simple generators were not simple to turn into motors but this proved to be particularly tricky with my three phase generator. Doing this requires me to create a....
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The function for automatically control the speed of your fan according to the temperature. Component: BT136 Triac, Capacitor, Resistor, Relay, Fan Motor, ....
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The DE2 board provides both USB host and device interfaces using the Philips ISP1362 single-chip USB controller. The host and device controllers are compliant with the Universal Serial Bus Specification Rev. 2. 0, supporting data transfer at full-speed (12....
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This remotely controlled watering system is both inexpensive and easy to expand. It is designed to operate in conjunction with a conventional watering timer and allows remote switching between nine zones. The prototype is used in a bore system, where a....
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The metal detector circuit consists of detection oscillator, reference oscillator, mixer and signal display, it is shown as Figure 8-70. The detection oscillator circuit is composed of the time base oscillator ICl, inductor Ll, potentiometer RPl, diode VDl....
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I have a circuit (see attached) provided by an LCD manufacturer that illustrates using the POL signal from the display to derive the VCOM signal. From what i`ve read, LCD Bias ICs generate VCOM from the high bias voltage. Is it possible to instead feed the....
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This circuit was devised to switch power to a Peltier cooler in a vehicle. Power to the load from the vehicle s battery is switched by a SPDT relay while....
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A number of people have been unable to find the transformer needed for the Black Light project, so I looked around to see if I could find a fluorescent lamp driver that does not require any special components. I finally found one in Electronics Now. Here it....
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This USB connected unit implements a microcontroller based DDS Signal Generator providing Sin and Triangular waveforms with adjustable magnitude and offset up to 50 kHz. TTL and 1 V square waves are simultaneously provided. Additionally ± 12V and a variable....
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Building a solid-state linear amplifier. I have an old Heathkit SB 221 that after a major overhaul and redesign is now working great on 80, 40, 20, and 15; but not 17, 12 and 10. With this in mind I got on the internet at the motel we were staying in and....
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Car Stereo Amplifier Circuit with TDA2040 is shown here. TDA2040 is a monolithic integrated audio amplifier operating in Class AB mode. The IC has built in short circuit protection circuitry and thermal very close and more about it can be operated from a....
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The circuit given here is of a three input mic mixer cum preamplifier using the IC LM348. The LM348 is a high gain, internally compensated quad operational amplifier with a class AB output stage. The IC has very low input supply current drain (0. 6mA/ opamp)....
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We used buffer IC`s (7417, 7414) to isolate the signals to and from the Arduino. This protected the board, and provided power for external devices without drawing it from the Arduino. An H-bridge can be thought of in much the same way. It is the interface....
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The circuit our localizer is based on consists only of a quad-band GSM/GPRS module interfaced with a a microchip microcontroller which, after initializing the I/Os and UARTs it has at its disposal, puts the main program in a loop waiting for some event,....
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The idea behind this economical‚ ashing LED indicator is very simple. It uses a very low frequency oscillator to drive two LEDs. As can be seen in the circuit diagram, the LEDs are connected in anti-parallel. At every change in level there will only be a....
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Single-phase induction motors are extensively used in appliances and industrial controls. The Permanent Split Capacitor (PSC) single-phase induction motor is the simplest and most widely used motor of this type. The classification, construction and working....
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A 12V power supply is a very essential and useful supply for Lab because it is used by a huge list of electronic circuits and devices. So you can build a 12V power supply circuit according to your ampere requirements. voltage regulator IC available in 3....
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A solid state flyback driver based on a micro solid-state Tesla coil circuit created by Steve Ward. The schematic is reprinted here with credits to Steve Ward: microsstc. jpg. NOTES ON MY DESIGN: Instead of an air-core Tesla Coil setup, I used a flyback.....
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FIG dual-channel circuit LM378 dual operational amplifier composed of Europe. Supply voltage Ub 24V and 8 ohm load (or 16 Euro), the output power per channel 4W. Circuit with i..
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This circuit requires a regulated 10V-DC front end capable of supplying 2 Amps. Begins the charge period at 240mA and at full charge switches automatically to a float condition (trickle charge) of 12mA. The capacitors should be the ceramic 50V (or greater)....
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Before designing with one of today`s powerful buck regulator ICs, you`ll want a thorough understanding of voltage mode control and compensation. ....
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This simple circuit proves to achieve surprisingly good results when used with the IRS/PDIF transmitter described elsewhere in this site. The IR receiver....
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A very simple active antenna can be designed using this electronic circuit diagram. This active antenna is based on transistors and other few common electronic components. Because in practice of frequency short-wave reception, the general rule is that if the....
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The following applications circuits are intended to illustrate the following points: A 2-KO resistor should be in series with V + to limit supply current with negative ringing oi the bit. inputs. Temperature compensation for Rns(on) can be provided in the....
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The overall performance of any rf circuit in regards of it`s phase noise and spectral purity depends significantly on the frequency generating circuitry, commonly an oscillator. Low noise oscillators with high spectral purity are neither witchcraft nor black....
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One of the many random devices I`ve found in my sometimes frightening basement was an HP frequency counter. The thing is built like a rock, still works perfectly and the manual contains full parts list, a complete circuit diagram and a description of the....
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Figure 4-7 pitch analysis using the relation obtained above design calculation control circuit, where Ai is a buffer to put the big stage, to reduce the burden preamp output. L..
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AD623 integrated 3-way amplifier. Single or dual supply can work with high CMRR and low voltage drift, programmable gain control in addition to an external resistor, all compon..
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Early schematic of a Colpitts circuit, using a vacuum tube, redrawn from the patent publication. A Colpitts oscillator, invented in 1920 by American engineer Edwin H. Colpitts, is one of a number of designs for electron....
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An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negative voltage doubler / rectifier circuit composed of diodes CRI and CR2, with the capacitor C1. The....
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Hall Effect sensor will produce a voltage proportional to the magnetic field strength received by a Hall effect sensor tersebut. Sensor it only consists of a silicon layer and two electrodes on each side of the silicon. By the time without any influence of....
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The schematic of its mixer part shows such an oscillator. The oscillator LC circuit only has two connections to the valve. It has no tap or tickler coil. Oscillations will only the occur, if the tube provides a negative resistance which compensates the....
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You are here: Btechzone | Job Updates | JNTU Updates » Basics, Electronics, Projects » ECE Mini & Major Project on Vehicle Tracking System using GPS and GSM modem Warning: Missing argument 2 for wpdb::prepare(), called in....
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FM radio receiver circuit is an FM receiver made by IC TDA7000. The circuit uses IC TDA7000 FM receiver can be supplied with a DC voltage of 2 volts DC to 12 volts DC. FM radio receiver circuit includes a series of simple because it uses the TDA7000 IC. IC....
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Sometimes you have to do it the hard way, even if doing it the easy way is an option. That is the case here. The intention is to add a second doorbell in parallel with the existing bell. This does not, in principle, require any electronic components. You....
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All of the parts in this list are generally available through Radioshack for less than $20. I highly recommend using breadboard! You`re bound to make mistakes your first time and soldering it will only make your fail worse (double fail ). I`ve compiled this....
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Circuit shown in Figure: MAX6698 maximum temperature with three transistors (VT1 ~ VT3) and three thermistors (RT1 ~ RT3). The internal reference voltage source via a resistor ..
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Safety is a major concern in a good many motor-driven applications. This is true in industrial applications where motion starts when power is applied and e....
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This chapter provides detailed schematics of a variety of power supplies suitable for use with the common Ar/Kr ion tubes available to the hobbyist on the surplus market. Included are examples of commercial designs (Omnichrome 150R and 532 head, Lexel 88 and....
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When enough light falls on the LDR in this circuit, an alarm tone is played on the loudspeaker. This tutorial shows beginners in electronics how to build the circuit on breadboard step by step....
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100W resistance triggered doer control circuit It is dragging the arc welding machine control circuit of the most simple kind. Adjustment potentiometer Rr, can change the DC mo..
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This unit is intended to be connected to an existing car stereo amplifier, adding the often required extra "punch" to the music by driving a subwoofer. As very low frequencies are omnidirectional, a single amplifier is necessary to drive this dedicated....
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My major project over the last few months has been the construction of a small Tesla coil, having wanted to make one for many years now. My first experience was at a demo day at UNSW over a decade ago, and since then I`ve always had a bit of a fascination....
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This is Power AC Dimmer 1200 watt size. It is use a triac Q4006LT. Friends ever tour is the foreign land has and to ever reach rest a hotel. On bed head has....
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With the relaxation oscillator, we basically achieved a fairly regular square wave. Let's change the duty cycle (and visualize the effect with LEDs). Wire up the following variation on the relaxation oscillator circuit..
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To simplify the following schematics and facilitate easy understanding of the principles involved, the following schematic substitution is used (Note the triac driver is of limited use at 3 f voltage levels).
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This is a minimum component complete Universal Counter. It can use input frequencies up to 10 MHz at INPUT A and 2 MHz at INPUT B..
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The LM78XX series typically has the ability to drive current up to 1A. For application requirements up to 150mA, 78LXX can be used. As mentioned above, the component has three legs: Input leg which can hold up to 36VDC Common leg (GND) and an output leg with....
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Since portable PCs are today common and a USB linkis a better solution here we present an oscilloscope using USB port of the PC that operates at upto 10 kHz with ±16V input voltage. Ithas much more improved features thanthe PC-based oscilloscope.The....
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For this test you will need an analog (non-digital) voltmeter. Do NOT remove the distributor connector. Using small paper clips, insert them into the backside of the distributor wire harness connector to make contact with the terminals. Do NOT damage the....
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The SCC2 is a solar charge controller, its function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic....
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By combining switching and series-pass techniques, this high-voltage supply`s designer achieved 0.01% regulation at power levels to 100W....
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This is versatile digital counter circuit, that as a cheap due to basic components you can buy in many electronic shop. My friend said the some circuits that....
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Version V2. 9 supports also GPS-receiver with ANTARIS chipset and simultaneously using of internal temperature sensor of MS5534A and external DS1820 sensor. This version can use 24C256, 24C512 or 24C1024 EEPROMs and has an internal `bootloader` implemented.....
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This DIY lightning detector circuit is a very sensitive static electricity detector that can provide an early warning of approaching storms from inter-cloud discharge well before an earth-to-sky return strike takes place. An aerial (antenna) formed of a....
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The security of many electrical devices depends today on the availability of an earthed mains outlet. We should remember that these are connected to the frame or to the metal housing of the equipment and so it routes to the protective earth (PE) connections.....
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The circuit uses two gates of a 7400 IC cross-connected to form an astable multivibrator driven by the 1-pulse per second output of the digital clock IC. The hee-haw circuit has a low frequency astable modulator added to make a self-contained European-type....
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5 WAY AC FLASHER We use these types of circuits in most ceremonies (wesak festival, christmas, wedding, ). This 5 WAY AC FLASHER circuit....
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Door open alarms are used chiefly in automotive, industrial, and appliance applications. This type of circuit can sense the opening of a refrigerator door. When the door opens, a triac could be activated to control the inside light. The figure shows a door....
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Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram This is a class AB transistor power amplifier. It is a simple amplifier to....
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This Balanced pre amp circuit is designed to amplify a little line-level audio signal (from 0 dB to 20 dB), and has balanced inputs and outputs. The scheme uses only conventional components, you`ll have no trouble finding in any electronics. ..
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The cardinal principle originally designed is, the temperature value that the one-chip computer gathers the temperature sensor real time and place is compared with thermostatical values presumed and dealt with. Thus control and keep the temperature value of....
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Bluetooth is an open wireless device technology standard for exchanging data over short distances from fixed and mobile devices(using short wavelength radio transmissions), creating personal area networks (PANs) with high levels of security. The Bluetooth....
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The overall design went through a number of design changes as I tried one
option after another and in the end, the simplest one won out. I had tried to utilize
all electronic (no relay) circuitry but creating the high power circuits was too much
of a....
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Arduino Mega 2560 Board Tutorials Projects Drivers, Schematic and complete Information...
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Hey guys, I am new to the forum. I hope this is the right section. Sorry if I ask some dumb questions, I am new to circuit design. This is for my....
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This circuit is a toy to encourage young children to count. Power is turned on by switch S1, then S2 is closed. This makes nine LEDs flash slowly. S2 is then opened and the LEDs go out. Pressing pushbutton PB1 turns on a random number of LEDs - briefly -....
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The schematic of the updated power filtering on the R2 PCBs. One of each of the 100n capacitors could be replaced with 10n, or even 220pF to improve the spread of response times to spikes. The Super Psycho Modulation Source is a fairly simple circuit with a....
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In many projects use is made of alphanumeric LCDs that are driven internally by Hitachi`s industry-standard HD44780 controller. These displays can be driven either in 4-bit or 8-bit mode. In the first case only the high nibble (D4 to D7) of the display`s....