Popular Circuits Page 194
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The ISL6740A is an enhanced ISL6740 PWM controller featuring built-in voltage feed forward functionality. It is pin and feature compatible with the ISL6740 double-ended pulse width modulating (PWM) voltage-mode controller, allowing easy drop-in replacement....
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power amplifier An amplifier designed to deliver maximum power output to a load. Example: In an audio system, it is the ....
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As electrolytic capacitors age, their internal resistance, also known as "equivalent series resistance" (ESR), gradually increases. This can eventually lead to equipment failure. Using this design, you can measure the ESR of suspect capacitors as well as....
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Triangular wave generator using opamp. Circuit diagram theory and working. Integrating square wave produces a triangular wave. Practical circuit diagram of triangular wave generator....
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The combination of Ql, Q2 and Ul form a hysteresis oscillator to stabilize lamp illumination. In operation, full wave bridge D3 operates directly from the ac line to supply unregulated dc to the lamp and also to the 10 V zener that provides power to the quad....
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This is the 200W lamp flasher circuit diagram. The frequency/speed of the lamp flashing can be adjust with the range of 1Hz to 5Hz. You can use the PR1 variable resistor (trimpot) to adjust the flashing speed. The duty cycle of lamp flashing can be adjusted....
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Learn how to interface LEDs with 8051 Microcontroller. Download free source code and circuit diagram of P89V51RD2 Microcontroller ..
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This circuit uses an LM2917 frequency to voltage converter. The input was connected to the low voltage side of the ignition coil, and the various components around it design to produce a full scale output at 6000rpm, which corresponds to 12000 ignition....
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Electronic frostbite treatment instrument ASIC SL9711 constitute an oscillation circuit, a power amplifier and controller, and generates 100Hz 3Hz sine wave, after the step-up ..
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This intercom uses an ordinary speaker to function as its microphone. Once the button is pressed, the relay toggles, and the speakers interchange their functions. One works as a normal speaker and the other one works as microphone. ..
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This simple circuit drives 6 LEDs in `Knight Rider scanner mode`. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version)...
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The prototype for this model is one of a `DSG` class of 24 locomotives built in 1981 by Toshiba for the New Zealand Railways. These locomotives weigh 56 tonnes and have two diesel engines, providing a total of 750kW. In more recent years they have been....
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This is an astable multivibrator (oscillator) circuit using CMOS inverter. This circuit uses CD4007 or MC14007. This circuit has operating frequency range of....
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The pitch of the tone is dependent upon the resistance under test. The tester will respond to resistances of hundreds of kilohms, yet it is possible to distinguish differences of just tens of ohms in low-resistance circuits. Q1 and Q2 form a....
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Battery run times for notebook computers and other
portable devices can be improved and acoustic noise
reduced by using Linear Technologys LTC®1695 to optimize
the operation of these products internal cooling
fans. The LTC1695 comes in a SOT-23 package....
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When I got the car I was relieved that it didn`t "chirp" or blare the horn every time I locked or unlocked the doors. Let`s face it, there are times when we don`t want our comings and goings announced in such a tactless manner. Still, I found that in the....
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I would have assumed that anyone interested in building one of these would have a reasonable understanding of electronics in general and the use of operational amplifiers in particular. This circuit relies on the fact that the phase difference between the....
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The DE2 Board has eight 7-segment displays. These displays are arranged into two pairs and a group of four, with the intent of displaying numbers of various sizes. As indicated in the schematic in Figure 1, the seven segments are connected to pins on the....
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Since I have provided the schematic for John L Linsley-Hood`s Class-A amplifier, I felt that some readers may wish to experiment with the concept. Unfortunately, a very low ripple power supply is needed for all Class-A amps, and the most common solution is....
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The inductor is made by winding 8 turns of #24 insulated solid copper wire on a 5 mm screwdriver. I used a conductor from a piece of category 5 quad twisted pair, left over from wiring the house with Ethernet and this seems to work well and to be easy to....
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Control a relay from an Arduino compatible board. When I try to activate the relay from the Arduino it takes at least a second to switch closed and sometimes does not switch closed at all. Digital pin 2 of the Arduino is connected to IN0 of this circuit....
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Here is my design for a modern receiving converter for pre-war FM sets. Accordingly, this article presents a design for listening to present day FM stations on a prewar FM set based on a MOSFET transistor and a TTL (transistor-transistor logic) packaged....
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This project involves making several modification to an early 1960s era Victoreen CDV700 or CDV600-6B geiger counter. These counters are available on E-Bay for around $50 to $100. The modifications use modern electronic parts to improve the counter`s....
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This Circuit shows the GT4122 used as a two input video mixer.
An evaluation PC board has been made and the artwork is
included. Using this circuit, many of the critical circuit
parameters can be measured including Crossfade Balance,
Linearity,....
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That HID headlights + small slim line plates REDUCE the distance a police car can ambush you (lock in with laser/LIDAR) to get....
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The circuit was designed to create an audio mixer that can be assembled in modules while providing 6 or more input channels. Audio Mixer a device used t....
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Charge your iPod without connecting it to a computer! Using the USB port on your computer to charge your player s batteries is not always practical. What....
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Build a small battery powered device containing a servo. I would like to be able to turn off the servo to save battery life. I have read previously that MOSFETs can be used to do this, but I am having trouble finding example circuits that are detailed enough....
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Hi lads, I thought I`d start a thread on the diagrams I`m making. This first set is for DOSD. After a potential problem was discovered recently these new diagrams will enable you to wire up the DOSD perfectly safely avoiding the potential problem. Click on....
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This box is a portable transfer standard to maintain and carry with you a local time signal of 59 short beeps (pips) plus a long 0.4 sec beeeeep on the full minute. At the start of the job, the box is started by manually synchronising it by ear with a....
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This circuit was developed to charge the Lithium-Polymer cells used in a model aircraft. Lithium-Polymer cells are incredibly lightweight compared to Ni-c....
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Most of the time a charged lead-acid battery and a power inverter would be used to ensure a smoothly organised holiday where ideally the missus and the children cheerfully use their electric and electronic gear! With rechargeable lead-acid batteries it`s....
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Today I have collected a small amplifier IC circuit to you. Most of the old series. and It is a simple circuit OTL series,....
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The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
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Using a modified version of the last program, we can control as many servomotors as we have I/O lines on port B. In the next listing, we will control two servos in the same manner as we controlled a single servo in the previous program. The circuit is shown....
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Here the complete electrical circuit diagram of line follower robot which built based on ATmega16. There are three modules of line follower robot circuit that are sensor module, microcontroller module and DC motor module. Download thedocument of ATmega16....
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Here is a very simple project of controlling a small DC-motor (taken from an old personal cassette player) with ATmega8. The ATmega8 is having three PWM channels, out of which two are used here. PWM waveforms are fed to MOSFET (RFD3055) H-bridge. Here,....
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This is an 8MHz amplitude modulated (AM) radio transmitter, which I built mainly for work, and also as an exercise in electronics (it is the first RF transmitter I`ve ever built). We wanted to have a simple radio transceiver design at our disposal for some....
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A simple single player PONG game using a LED matrix while thinking about how the sync signals logically worked together in the Analog Pong Game I had built. I originally wanted a 10X10 matrix for the ball, and tried to think of some chips capable of counting....
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This relatively simple mixer was designed for three dynamic microphones, but can be re-designed for more or less. Level and tone controls are available to tailor the sound to your needs...
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This circuit is conventional Pierce type oscillator that uses a JFET. The circuit uses fundamental mode crystals. It has decent performance and reliability if we use a low noise JFET. This is the figure of the circuit. The feedback is controlled by the C1....
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Today we come to see the circuit detects the light by have a voice warn. When meet the light or be become dark depend on using S1 ( follow the circuit )..
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The LCD module has built-in fonts and can be used to display text by sending appropriate commands to the display controller, which is called HD44780. Detailed information for using the display is available in its datasheet. A schematic diagram of the LCD....
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As shown for the OPA37 constitute a low-noise preamplifier. Input signal is applied OPA37-inverting input (pin 3), circuit RL, CL is the load impedance electromagnetic pickups,..
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Use this circuit to test if the light coming from your 40khz IR emitter is really emitting the right frequency. The schematic says to use a GP1U5X ir module, but probably any 40khz detector module will work.. I used a GP1U26X module...
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If you use a lamp with a motion sensor for outdoor lighting, the original electrical switch is actually no longer necessary. If you replace the switch with the circuit described here, an acoustical signal will be generated each time the outdoor lamp is....
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Going camping nowadays involves taking lots of electronic equipment whether for day to day running or for fun and entertainment. Most of the time a charge....
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Using the thermistor-bridge circuit, you can detect system-cooling air losses caused by filter or inlet ..
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This page covers only the details of MIDI communication on the Arduino module. For a more general introduction to MIDI on a microprocessor, see the MIDI notes on Tom's physical computing site. MIDI, the Musical Instrument Digital Interface, is a useful....
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A simple PLL FM demodulator circuit using IC XR2212 is shown here. XR2212 is a highly stable, monolithic PLL (phase locked loop) IC specifically designed for communication and control system applications. The IC has 0. 01 Hz to 300KHz frequency range, 4. 5....
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Differentiator circuit is application circuit from playable mathematics formula (influenced) from capacitor activity. The circuit like at picture under this with simple circuit from differentiator. To get formula differentiator, the sequence is as following:....
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The following circuit shows about Field Strength Meter Circuit Diagram. Features: useful for radio frequency hobbyist and enthusiast, uses only ....
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This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is....
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The following circuit shows about Airplane Flight Timer Circuit Diagram. Features:switches in the closed position, battery voltage in the safe ....
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High-speed DACs, such as Analog Devices` AD9776/78/79 TxDAC family, offer differential outputs, but, for low-end ac applications or high-precision level-setting applications, a single-ended current-output DAC with a differential-conversion circuit provides a....
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This is a diy simple stun gun circuit showned only for learning! In No Way Do I Recommend Building these Stun-Guns or the actual use of them for any purpos....
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A TL081 op amp is used as a high impedance to low. converter and a signal mixer. The input impedance is about 1 megohm and the output impedance is about 1 kohm. Two 9 volt batteries are used as power source.
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The circuit mixes LEDs of different forward-bias requirements, yet keeps the loads reasonably well-balanced through use of a current mirror comprising transistors Q1 through Q4. It also eliminates the need for a separate current-limiting "ballast" resistor....
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This Mark3 version of the Infra Red extender is a special version designed to control appliances that use high frequency modulated IR remote...
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From 230 V AC a DC supply of + 5 V is obtained. The power supply is given to the other blocks. The pulse generator at a particular frequency generates the clock pulses. The clock pulses are counted by a counter and gives output after every 10 pulses. The....
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Using ADF4007 high frequency divider PLL synthesizer can be designed a variety of communications applications. It can operate to 7. 5 GHz on the RF side and to 120 MHz at the PFD. It consists of a low noise digital PFD (phase frequency detector), a precision....
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The leads from the transformer to the circuit are quite long (>5m). Apparently the 110V side of the transformer was switched off somewhat frequently lately which likely caused a spike on the secondary (24V) side. The input pin of the LTC3631 has a visible....
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Many people experienced sleeping well in natural surroundings, into a tent or a wooden hut. This fact is due not only to the healthy atmosphere but also from our unconscious ability to perceive natural Earth`s magnetic-fields.
The circuit generates this....
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For a lower parts count than the 2 transistor multivibrators, 2 LEDs can be alternately flashed with a 555 integrated circuit configured as shown in Schematic 2. I chose the combination of a 2K2 and a 47K resistor to determine the oscillation frequency along....
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This application note is intended to familiarize the filter designer with the fundamentals of active filter design, using monolithic IC op amps. It presents a table of transfer functions and network equations for high-pass, low-pass, band-pass and....
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Light Switch. This is a light switch or light activated relay circuit.The relay if LDR uncoverd and relays, if LDR VR1 covered. Adjust sensitive.LED for...
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This charger will quickly and easily charge most any lead acid battery. Electronics project, easy to build, with circuit diagram included....
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2N3819 is an n-channel JFET especially manufactured for RF and mixer applications and provides very low noise, very low distortion and excellent high frequency gain. Make a PCB in very easy steps. ! Create your PCB design using PCB designer software like....
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History of Nikola Tesla and Tesla Coils, how a tesla coil works, and an example of a homemade TC. The homemade diy tesla coil is battery operated, and has a gas plasma discharge terminal., Arcs can be made to resemble a double helix. High voltage capacitors,....
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The capacitor C charges via R1 and R2 and when the voltage on the capacitor reaches 2/3 of the supply, pin 6 detects this and pin 7 connects to 0v. The capacitor discharges through R2 until its voltage is 1/3 of the supply and pin 2 detects this and turns....
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It is often convenient to be able to fade in or out or mix at any wanted level the inputs from two audio sources. The circuit in Figure 37 is suitable for this purpose. One input is to socket 1, and the second to socket 2. Each input is suitable for high or....
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Many households are still graced by tube-type television sets. If you want to connect one of these large tellies to your stereo system to improve the sound quality, this is usually not a problem because there are plenty of SCART to Cinch adapters available....
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A 40 watt fluorescent (tube lamp, TL) or two 20-watt tubes in series will be driven by this circuit. The transformer is wound on a ferrite rod 10mm dia and 8cm....
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The Oscillator DesignGuide is integrated into Agilent EEsof`s Advanced Design System environment, working as a smart library and interactive handbook for the creation of useful designs. It allows you to quickly design oscillators, interactively characterize....
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When firs time found this article, i think it`s a great project using only few component. I like microcontroller project based on LED. And as you know this....
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D switch S location function. FIG microphone to a speaker on behalf of the (also designed a door using an electret microphone) port channels through C9 send people IC2 amplify ..
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The circuit has educational purpose, so being simple is a must. I`m also trying to build it only with components that I already have (a bunch of resistors, capacitors, transistors and none IC)...
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The complete hardware schematic of the Night Light Saver V6. 0. The AC line was protected F1, a 1A fuse. Any short circuit caused by saver`s components will blow the fuse. R1 and C1 limit current to the +5V zener diode, D3. R2 discharges capacitor C1 when....
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The BA1451F is a Tuner system IC for electronic tuning for AM Radios FM IF, and MPX. It has been developed for HiFi component applications. The MPX VCO circuit requires no adjustment, which will enable a reduction in the number of production line processes.....