New Circuits Page 26
- Page 26
-
High quality DAC convertor from USB to S/PDIF. I choose PCM2704 circuit, which sent me TI company like sample. Circuit has analog output for headphones and digital S/PDIF output with electrical and optical(TOSLINK) interface. We can use too 3 HID buttons for....
-
-
This circuit produces a tone according to the button being pressed. Only 1 button can be pressed at a time, that`s why it is called a monophonic organ. You can change the 1k resistors to produce a more-accurate scale...
-
Whether it`s truckthrottling over the highway, or an airplane roaring about the sky, or whether it`s a knock on the door or a purring of the cat or simply your heartbeats, the vibration level detector circuit explained here will sense them all and convert....
-
I was inspired by the excellent work done by others on these boards using DMX sequencing and various parallax products to interface with them. I decided to take my crack at it using the propeller only with a slightly different spin, pun intended. I decided....
-
-
The ML7005 is a multi-functional DTMF transceiver LSI with built-in a DTMF signal generator, a DTMF signal receiver, a call progress Tone generator, a call progress Tone detector, and a FAX (FX) signal detector. Each functional block CAN be controlled by an....
-
-
This circuit is designed as per a request made by Mr Vinoth from India. His requirement was a 12V/5A DC fan motor controller. I think this circuit is sufficient for this purpose. Quad 2 input Schmitt trigger IC CD4093 is the heart of this circuit. Out of the....
-
The timer is used in typical configuration, except that the timing resistor is replaced with the current source based on the op-amp DA1 (741). This solution allowed to obtain a good linearity (better than 3%). With the value of components used in this....
-
The most important part of this 88-108 transmitter is the Colpitts oscillator. C3,C4,C5,C6,CD1-CD2 ans L1 determine the transmission frequency. The RF Osci...
-
-
The 1812 Overture by Tchaikovsky lasts for 14 minutes and 40 seconds. It is scored for a philharmonic orchestra having up to eighty musicians, playing a wide variety of instruments. The instruments include strings: violins, cellos, basses, brass: trumpets,....
-
-
We can use the 555 timer to hold the cost down of adding a triggered sweep to an economy oscilloscope. The timer is triggered by the circuit`s input op amp,....
-
My project is about constructing two similar EMG circuits (differing in gain) to measure EMG from two forearm muscles called the Flexor Digitorum Superficialis (FDS) and Extensor Carpi Radialis Longus (ECRL). The outputs from the EMG circuits will be....
-
This project is used to automate the home appliances through Bluetooth enabled PC. You can use the USB Bluetooth at the PC side and an Serail Bluetooth...
-
To obtain the power supply graphs on the previous page, I didn`t stand outside for two days straight measuring the power sources with a voltmeter. Instead, the circuit itself is able to independently monitor the power sources with the addition of a few....
-
The circuit features automatic Exit and Entry delays, timed Bell Cut-off and System Reset. It has provision for normally-open and normally-closed switches and will suit the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and....
-
This simple home alarm project can be used together with a momentary contact of a motion detector to trigger an alarm similar to police siren for a duration from a few seconds up to 220 secs ..
-
A high-input-resistance op-amp, a bridge rectifier, a microammeter, and a few other discrete components are all that are required to realise this versatile circuit. This circuit can be used for measurement of dc, ac rms, ac peak, or ac peak-to-peak voltage....
-
An idea came to me while watching the waves coming in from Malaspina Strait during a storm a couple of weeks ago. What if a person could hear the sounds of ocean waves as an audio recording Not the sounds you`d hear while walking on the beach, or even under....
-
-
This article explains how to design a stepper motor system using an 8-bit Freescale microcontroller - MC68HC11E9..
-
A very simple FM transmitter circuit can be designed using MC2833 integrated circuit, designed for cordless telephone and FM communication equipment. It includes a microphone amplifier, voltage controlled oscillator and two auxiliary transistors. The final....
-
The motor vehicle is the automotive of no emission at present, as the means of transportation of green, will bring the huge change to human society in the 21st century. And the direct-flow brushless electric machine relies on its fine characteristic to....
-
Here`s a Tesla-coil secondary to try: Wind 750 turns of 24-gauge enameled magnet wire onto an 18 long piece of 1.9 outer-diameter PVC pipe. The large coil has an inductance of about 2800 mH, with a self-capacitance of about 20 pF. One end of the coil should....
-
-
Flip-flop, as an astable multivibrator, can be used to generate timing signal in music: metronome. By adjusting transistor bias resistor using a 100k....
-
Single-capacitor circuit is reIiable over wide range of temperatures. voltages. and transistor gains. Frequency varies only by 0. 05% for supply voltage changes between 6 and 12 V. Timing can be changed with R1. R2. and C. Ducy cycle depends on ratio of R3.....
-
-
Interior lights come on when I enter the car, and most of the time do not go out while driving. Once I park the car and remove the key, the lights will go off like they are supposed to. how do fix this problem in an otherwise fabulous car When you get out....
-
Here`s are some circuit diagrams for driving relays from a microcontroller. Make sure you`re using a 5-volt relay (this refers to the coil, not the load circuit), and make sure that the relay has a high enough rating for the load that you`re driving. This....
-
This page deals with the subject of replacing the crystal in any type of Temperature Compensated Crystal Oscillator (TCXO), be it a Motorola "Channel Element", a GE "Integrated Circuit Oscillator Module" (commonly called an ICOM), or an RCA TCXO. Here we`re....
-
The constant current charging circuit which is composed of the three-port voltage stabilizer is as shown in figure 2-21. Because the electric potential difference of the LM317`s pin-1 and pin-2 is 1. 25V, if we ignore the shunting effects of R3, R1, LED, the....
-
This is a circuit to test zener diodes. It hooks up to a 120V AC line and boosts the output voltage to over 300V allowing you to test zener diodes of any voltage. The circuit also has a push button switch to triple the current, if needed. The output is....
-
Electric fence control circuit is composed of the power supply circuit, pulse generator and high-voltage circuit, and it is shown in Figure 4-27. Power supply circuit is composed of the power transformer Tl, rectifier diodes VDl, VD2, filter capacitors Cl,....
-
In this Arduino-based project, we will build a lamp with multiple light displays: color sequencer, dimming light, color chaser, firelight all selected by a touch bar on the circuit board. We will be going the minimalist way for this project, filling the....
-
The device exhibits 24V at no load on pins +4, 5 and -7, 8. According to Wikipedia, this is called a passive power injector. I tried drawing 1A from the device and failed (some protection drops the voltage to 0V). @W5VO, thank you for your care of the....
-
The circuit described here is derived from a conventional design for a simple lamp dimmer, as you can see if you imagine a diac connected between points A and B. The difference between this circuit and a normal diac circuit is that a diac circuit won`t work....
-
Using BA1404 can be designed a very simple and useful fm stereo modulator electronic project. This BA1404 fm stereo modulator device works in FM broadcast band ( 75- 108MHz) and require few external common components. The BA1404 fm stereo modulator Ic....
-
This is a two-zone alarm - with automatic exit, entry and siren cut-off timers. It can be triggered by the usual types of normally-closed input devices - such as magnetic reed contacts - foil tape - PIRs etc. I`ve used a 12-volt supply in the diagram - but....
-
A Peak Detector is any circuit that functions to detect the peak voltage of an incoming waveform. Basically the circuit is used as an Amplitude Modulation [AM] detector, Pulse Amplitude Modulation [PAM] detector or Envelope detector. The particular circuit....
-
Remotly check the temperature of a few things, in my case the repeater site at GB3PY. A system which used a radio to receive requests for the currenttemperature and send the results back to the user. Requests are by DTMF tones and the response is in CW,....
-
-
His transducer is out of a humidifier and it operates at 48 Khz. It has the driver circuit too. Easy access for mods. I may have to go to walmart. From the looks of things, as I am taking apart one of the two transducers I have - They look like they`re not....
-
-
The project will take the circuit for a 12W power amplifier and develop it into a completed hard-wired unit. This process will require a design cycle and development sequence consisting of analysis, simulation, PC board layout, population of the board,....
-
A ringer interface circuit, and I`m running into problems that are over my head. The purpose of the circuit is to buffer the output of a central telephone system that goes to several ringers spaced throughout the building. The reason for the circuit is that....
-
Number of controls are required to be provided on a panel of CRO to facilitate its proper functioning. Intensity control is provided for adjustment of brightness of the spot on the screen. It is accomplished by varying the voltage between the first and....
-
-
-
Part II of the AAM Commander RC System Article, scanned from the May 1972 edition of American Aircraft Modeler....
-
Here is countdowntimer24 second circuit. Thistimercircuit build for automatis on or off electronic load. Thetimercircuits uses fast 74LS schottky IC`s. A 24 second countdown starts when S3 is off and S2 is pressed. Switch S3 is used to start/pause the....
-
The following circuit shows about Ultrasonic Sensor Circuit Diagram. This circuit based on the MAX232 IC. Features: 150mA quiescent current, ....
-
Pachisi game is designed for two persons. Each player has one figurine; the figurines are found in the early game on positions indicated by arrows. The goa....
-
Those drivers could run fourteen leds but just went with twelve. This means that i could add 12 leds to mine with no extra drivers. Not that i will do that now but if my tank gets bigger (honey i swear the tank has been growing from day one you just havent....
-
The project started with a request from a fellow member of the Long Eaton Club, Tony Bowler. He was interested in converting one of the `Golden Oldies` to electric free-flight. He choose Vic Smeed`s "Debutante" to power with seven AE size cells and a....
-
-
-
Ultra Fast Battery Chager for Nickel-Cadmium battery cells [NiCad] which will be discussed in this article is Fast NiCad Battery Charger, called the Ultra Fast Charger Battery Charger NiCad because it can make filling fast NiCad Batteries Cell. A battery....
-
Though stepdown converters - buck converters - are extremely popular, the rules of thumb and calculations that speed their design can be hard to find....
-
Is it (when operated through a spark gap) allways a quarter wave, or a half wave or multiple of a whole wave so that there are 2* n maximums that are achieved. Can someone point out to sources that are related to creating standing waves and the resonance....
-
-
This projects will describe a simple Servo Reverser that can be cheaply built using a CD4001 NOR gate, 4 resistors, 3 capacitors and one variable potentiometer (see schematic below)...
-
This circuit generates speed pulses from the speed-dependent voltage spikes generated by commonly used types of PC power supply fans, which are superimpos....
-
Today I have collected a small amplifier IC circuit to you. Most of the old series. and It is a simple circuit OTL series,....
-
The White`s Classic I was a very simple, easy to use machine, ideal for the entry-level detectorist to pick-up-and-go. It was a simple detector with no bells or whistles, only an on/off switch and a turn knob for a discriminator. It did not have much depth....
-
An audio mixer to which all the receiver audio outputs go, which is described here. The audio mixer`s output is amplified and drives a common speaker. So I hear all the radios (that are turned on) through that one speaker. This is fine as far as it goes.....
-
This oscillator circuit permits crystals to be electronically switched by logic commands. The circuit is best understood by initially ignoring all crystals. Furthermore, assume that all diodes are shorts and their associated 1kO resistors open. The two 1kO....
-
AVR ISP interface (optional but handy if you don`t like the boot loader, are too poor for a JTAG or AVR studio just crashed and disabled the on chip debugging ;) ) The following is the up to date bill of materials for the latest version of the PCB. The parts....
-
This circuit can be built from readily available low-cost components, some of which may even be hiding in your junkbox! The indicated value of 22 ? for re....
-
Although this Power Supply was designed for the Modular Burglar Alarm - it has other applications. It provides an output of 12-volts - at a current of up to 1-amp. In the event of a mains failure - the back-up battery takes over immediately. And when mains....
-
-
Here is a very simple passive headphone box that I have made that works really good. I have used this headphone box in several recording studios that I have worked in and have made them for different people. Because there are no active components, there is....
-
LT1206 is suitable for driving multiple video cables since it has 60MHz bandwidth, 250mA output current capability, and low output impedance. Please keep in...
-
The NJM2574 is a Low Voltage Video Amplifier contained LPF circuit75 driver and internal CLAMP/BIAS SWLPF/through SW to connect TV monitor directly. The input composite signal. (0. 5Vpp) The mute circuit with power save function is suitable for low power....
-
RMS value of the sinusoidal waveform is meas ured by the average reading voltmeter of which scale is calibrated in terms of rms value. This method is quite simple and less expensive. But sometimes rms value of the non-sinusoidal waveform is required to be....
-
An excellent tone burst generator can be made using 556 Dual Timer. We can connect the first half as a one-shot and the second half as an oscillator. The....
-
Following a power interruption, all relays assume their previous state before the power interruption. (relay states and PIN are stored in non-volatile memory) An Motorola MC145436 DTMF decoder is used, this IC is clocked with a common 3. 58Mhz NTSC colour....
-
-
Most cars do not have delayed interior lights. The circuit presented can put this right. It switches the interior lights of a car on and off gradually. This makes it a lot easier, for instance, to find the ignition keyhole when the lights have gone off after....
-
Long distance HVDC lines carrying hydroelectricity from Canada`s Nelson river to this converter station where it is converted to AC for use in southern Manitoba `s grid A high-voltage, direct current (HVDC) electric power transmission system uses direct....
-
Under the loading condition of the resistance, output voltage Uo variable range: 30V~36V; Maximum output current LOmax: 2A; When U2 becomes from 15V to 21V, the regulation factor SU of the voltage is less than or equal to 0. 2% Io =2A ; When Io becomes from....
-
An H bridge is a kind of circuit you use to control the direction (and sometimes speed) of an electric motor, using only a single polarity voltage (you need to reverse the way current flows in order to reverse the way the motor rolls). You have 4....
-
User Agrement & Disclaimer Disclaimer All files are found using legitimate search engine techniques. This site does not and will not condone hacking into sites to create the links it list. We will and do assume that all links found on the search engines we....
-
-
-
-
This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV / 0C is exploited for this application to create an accurate electronic thermometer. To display the measured....
-
Personal Safes are revolutionary locking storage cases that open with just the touch of your finger. These products are designed as "access denial" secure storage for medications, jewelry, weapons, documents, and other valuable or potentially harmful items.....
-
This circuit uses the versatile MAX038 function generator. Although in this circuit some of the advanced characteristics of this IC are disabled, you can generate Sine, Triangle, Square waves (adjusting A0 and A1 pins see datasheet on if you want other....
-
TV RF Power Amplifier 14W This RF power amplifier works in frequency 470 - 860 MHz UHF Band IV and V with power out 14 Watts with input power 1. 5 Watts. The power amplifier is suitable for amplifying rf signal your tv transmitter with 0. 5 - 2 watts power....
-
A very precise digital thermometer with LM35 probe (0, 1 degree of freedom). The circuit has two adjustments. One of them, R5, adjusts the displays to 0. To perform this, we have to connect the extreme part of R4 (that goes to the temperature probe) to the....
-
Efficient automatic solar garder lights circuit with minimum components the best deal is that is completely auto and the Solar panel acts as a light detect...
-
-
This is a regulated and adjustable power supply which can deliver up to 20A and adjustable voltage between 4 and 30V. It is easy to build and uses LM338 an....
-
The Atmel Flash devices are ideal for developing, since they can be reprogrammed easy and fast. If you need more code space for your application, particularly for developing 89Cxx projects with C language. Atmel offers a broad range of microcontrollers based....
-
Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated 16 bit digital to analog converter that has two digital to analog output channels. The....
-
MIDI, or Musical Instrument Digital Interface, is a specification for a communications protocol between digital synthesizers and other digital music devices. It was developed to be as simple and general as possible, to give synthesizer manufacturers as much....
-
-
-
This easy circuit provides good gain to weak audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that`s very sensitive to sound. Here the simple audio mic pre amplifier circuit based on single IC LM358.....