New Circuits Page 14
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Even if simple the circuit, plirej` all condition, regarding the distortion and the response of frequency. The resistance of entry is 250K and the load that can drive is between 100R and 2K....
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The circuit presented here usesNAND logic gates of Hitachi HD seriesIC HD74LS00, which is a quad NANDIC. Special technique has been employedto obtain three-state operation usingjust a single IC. Gate N1 is wired such that when theoutput of gate N1 is at....
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Here`s a twist to the age-old game of noughts and crosses. Instead of pen and paper, it uses nine 10mm tri-colour LEDs arranged in a 3 x 3 grid. One player has nine red buttons while the other player has nine green, set out in identical grids. The aim, of....
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What do you do with an old phone, a microcontroller and lots of time? You hook the old phone`s LCD screen to the computer USB of course...
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To understand how the 74AC14 PWM circuit works, let`s zoom in on the section of the schematic containing the trimpot, diodes, capacitor, and the first inverter logic gate. The capacitor is empty (discharged) when the power is first applied to the circuit.....
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the dc/dc converter is 110/220->12v not the other way. so the 12V takes the place of the battery, this comes from L4 (what you have marked L3) on t1 there`s really 4 windings, the 4th goes to the top GEN2 (you have 2 gen2`s) The pulse generators are running....
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The mentioned shunt-feedback configuration also allows the easy addition of frequency dependent networks in order to obtain an useful, unobtrusive, switchable Tilt control (optional). When SW1 is set in the first position a gentle, shelving bass lift and....
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This is the most simple and affordable solar battery charger that the hobbyist can make. It has a few drawbacks over other similar controls, but offers nu...
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The objective of this project was to design a small portable mixer supplied by a 9V PP3 battery, keeping performance quality. The mixer is formed assembling three main modules that can vary in number and / or willingness to adapt to the needs of all.....
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Maxim s DG508A and DG509A are monolithic CMOS Analog Multiplexers (muxes): the DG508A is a single 8-channel (1-of-8) mux, and the DG509A is a differential 4-channel (2-of-8) mux. Both devices guarant....
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Here is the diagram of radio controlcarreceiverprinciple circuit. Notes:The choice of transistor Q1 and the bias resistorQ1 1815 9018R1 240K 100K The choice of the high-frequency parameters partFrequency C1 C2 L227M 35P 30P 10uH35M 30P 30P 8.2uH40M 30P 20P....
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Thyristors are a class of semiconductor components exhibiting hysteresis, that property whereby a system fails to return to its original state after some cause of state change has been removed. A very simple example of hysteresis is the mechanical action of....
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This circuit can be used for inductive pick-up elements and dynamic microphones Most soundcards have a line` input and one for an electret (condenser) microphone. To be able to connect an inductive tape-recorder head or a dynamic microphone, an add-on....
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Do you have disco ears? If people ask you this and you re still well below 80 , you may be suffering from hearing loss, which can come from (prolonged) listening to very loud music. You won t notice how bad it is until it s too late, and after that you won t....
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Active crossover circuit design,circuit diagram,schematic, diy active crossover circuit,HiFi audio crossover, 2 (band) way crossover circuit using LM833....
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i am going to programmer my atmeg8515 Mc and i am searching for good and easy parallel programmer for it also i want to know the assembly instructions ....
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The LMV1090 is a fully Analog dual differential input, differ- ential output, Microphone array Amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice Communication applications. The LMV1090 preserves....
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Understand how come the LED will not light up as the Capacitor looks like it`s by-passing the switch. When the capacitor is full, it doesn`t transmit/conduct electricity You`ll notice that I`m very beginner, but after 20 hours of reading various tutorials, I....
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The search loop may be constructed in several different ways; however, the method offered here should get you headed in the right direction. Refer to Fig. 2 as a guide for constructing the loop. The loop form should be constructed from non-metallic and....
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The SCR is wired across the trigger circuit of the flash gun. Normally, the SCR is off, so the flash gun is able to charge to its trigger voltage. Photo transistor Q1 is used to monitor the light level. When a high-intensity flash occurs, Q1 briefly....
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A simple and efficient PWM lamp dimmer using timer IC NE555 is discussed in this article. Yesterdays linear regulator based dimmerscan only attain a maximum efficiency of 50% and are far inferior when compared to the PWM based dimmers which can hit well....
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This amplifier circuit based on IC TDA2612 produced by siemens, minimum voltage require for this circuit is 10 Volts and amximum voltage require 35 volts DC. Power output 25 watt with 4 ohm impedance. Frequncy response 20Hz to 20kHz. Quiescent current is 70....
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Interfacing the BT139-600 TRIAC with this MOC3051-M Opto-triac. Build a snubber circuit for the TRIAC as shown in the MOC3051M opto-triac`s datasheet @ page 8, figure 12. The load will be a 230V AC, 4A motor. What are the recommended characteristics of the....
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The circuit is presented as a starting point - there will be some experimentation needed for each individual case. For the popular microwave bands the LOs are usually generated from overtone crystal oscillators followed by multipliers, with the following....
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Simple, easily transported VSWR meter consists of high-gain amplifier, narrow-bandwidth (100-Hz) selective amplifier tuned to 1000 Hz, and variable-gain output amplifier driving low-cost VU meter. Ideal for nulling type VSWR measurements. Draws only about....
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A touch switch circuit schematic using 555 IC.When touched on the touch plate a relay will be switched ON for a preset time. This time can be adjusted too....
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The 555 Timer IC worked in three operating modes: monostable, astable and bistable/scmitt trigger. Here we will provide you with article of its astable mode...
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Based on this `manual` PCR machine I built a few weeks ago, the Light Bulb PCR machine uses a light bulb and an old computer fan as its heating and cooling elements: Instead of the switches pictured above, the unit is now controlled by an Arduino Uno, Code....
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This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. It has provision for normally-open and normally-closed switches and will accommodate the usual input devices (Pressure Mats, Magnetic Reed contacts, Foil Tape, PIRs and....
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The amplification of this circuit is about 12000 times, the bandwidth is 0.5~14MHz, the input resistance is 700?, the output resistance is 35?(measured with 5MHz), the output noise level is 0.6~0.8V. In figure, T1, T2 are direct coupling amplifier, they are....
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This low noise audio power supply circuit can reduces noise and ripple voltage by 40dB over the 100Hz to 20kHz audio range. In portable application such as....
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The laser diode ·pulser is a simple drive circuit capable of driving the laser diode with 10-A, 20-ns pulses. For a 0. 1 % duty cycle, the repetition rate will be 50 kHz. A complementary emitter follower is used as a driver. Switching speed is determined by....
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This LM723 variable power supply circuit design is a very simple variable power supply that will provide an output voltage between 8 and 30 volt at a maximum output current of 3 ampere. This LM723 variable power supply circuit design project has a very low....
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ok LOL i will buy transformer to run in a 12V battery but this one is not similar to what the user romerouk from overunity is using?....
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Measured output power and efficiency of a 6 dBm 130nm CMOS class-D inverter chain, using gate bias variation to create a pulse width modulated inverter output voltage (Cijvat et al. , 2008). (b). Efficiency versus output power of two amplifiers, one with....
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The electronic dog repellent circuit diagram below is a high output ultrasonic transmitter which is primarily intended to act as a dog and cat repeller, wh....
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Build a Hackduino board as explained here. Cut the speaker off of your wireless doorbell receiver. Leave as much wire connected to the receiver as yo....
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By using only two 2n2222 transistors, this small FM band transmitter can transmit its signal to 1Km away (without obstacles between the two antennas. ..
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It is on top labled toy car receiver. The toy car transmitter is easy enough to understand, and I suspect that the receiver is essentially working the same way, but backwards and with more filtering. I have no experience in RF except that I saw this circuit....
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This is a circuit diagram of the triangular wave producing circuit. We can produce the triangular wave with a series of two Op-Amp. You can use the LM741 op-amp. Op-amp first (left) is a series of comparison (comparator) while the Op-Amp circuit second....
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The circuit diagram of 7 segment counter circuit has been published here. This circuit consists of counter IC CD 4033 as its central part...
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This simple low power dc to ac inverter (dc to ac converter) circuit converts 12V DC to 230V or 110V AC. By doing simple modification you can also convert 6V DC to 230V AC or 110V AC. It can be used as inverters for home needs to enable light loads (electric....
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This circuit provides you with wireless audio and visual transmission to a TV. The TV acts as a receiver, eliminating the need to buy a separate monitor. You can also hook it up to a VCR or CCD Camera, and even set up a remote CCTV security system! Q3, VC1,....
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The circuit takes its input from the "zero-crossing detector", which provides it with a 0-to-1-to-0 pulse to "set" the R-S flip-flop and release the ramp circuit (A to Ramp) for it to start the ascent of the timing ramp...
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Experiments in rust electrolysis. The idea of using electricity to convert rust back into iron is not a new one, and electrolysis has been used for metal restoration by collectors and archaeologists for decades and the results can be very impressive, with....
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IC 555, Light Alarm (Sun Up Alarm) , This circuit designed to sound a loud alarm at the break of the dawn especially for those wh cannot wake up even with an alarm clock. Circuit can be modifi...
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As you can see in circuit diagram, this portable solar charger circuit, is based on a LM358N operational amplifier and one transistor. This regulator provide a constant 2. 4 volts DC and can be used for powering small devices that needs to be powered from....
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Trying to estimate the pump input energy your circuit needs, let say your average voltage input (waveform D) is around 6V (12Vpp) and let say your average input current (waveform G) is around 1. 5 - 2mA (8mApp) so to maintain the loaded oscillations in L1-L2....
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Compact thermal control solution for DWDM (Dense Wavelength Division Multiplexing) laser modules can be made using a MAX8520/21 and a single op amp....
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The program makes use of the built-in AD converter of the PIC16F874 for sensing the touch buttons. The PIC has 8 AD ports, seven are used for the 7 touch-buttons, 1 is used for the light measurement. In order to receive DCF signals, you have to add a DCF....
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This timer uses two 555 ICs to Vary the desirable output. VR1 and VR2 are the potentiometers to change the speed of cycles...
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This PIC16F877 microcontroller tutorial answers the question, "" How to implement a up down counter using PIC16F877 ? "" Using PIC16 simulator (Proteus) you....
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This almost trivial circuit may be used to charge a pair of AA or AAA sized cells in the sun. I have used it to keep my Palm Pilot and walkman radio running perpetually. This is an unregulated charger, proper charging is achieved by placing the unit in the....
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The inverter is kinds of direct currents can battery, storage battery Change into alternating current generally 220 volts of 50HZ sine waves or rectangular waves Device. Our common emergency power supply, 220V exchange to generally all invert the direct....
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This is a one of the light sensor. This circuit is a dark sensor that is based on op amp 741 IC as main control. This circuit is a simple design for sensor the light at the night. This is the figure of the circuit. For sensor the light is using LDR.....
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A simple humidity tester circuit using just a LED, transistor, and a few resistors is explaind with a neat circuit schematic....
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The IR circuit can be used to switch devices using TV Remote. Normal circuits can switch only one device. But using this circuit, different devices can be controlled using same remote with different switches. In this circuit, we interfaced 8 devices. These....
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An Astable Multivibrator or a Free Running Multivibrator is the multivibrator which has no stable states. Its output oscillates continuously between its two unstable states without the aid of external triggering. The time period of each states are determined....
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The Poppet" is a half-watt AM transmitter designed by Mr. Doug Gibson of England. The original design was published in issue 84 of SPRAT, newsletter of the GQRP Club. The version shown here incorporates changes suggested by Steve Hartley and others. Although....
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This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wired to set itself automatically when you turn-off the ignition. By adding external relays you can....
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Here`s a few details on the Infrared Remote Control Extender unit I designed and built to control my NAD T752 A/V receiver. The NAD T752 has an IR input socket on the back of it for system installs where the unit has to be inside a cabinet or at least out of....
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This is a design circuit project for a clear glass sensor circuit can be used for experiment/hobby purposes. The concept is very simple and is based on a home-made sensor unit comprising one high efficiency ultra bright red LED (D1) and a standard ph ....
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Keyboard is a basic and essential element of an embedded or microcontroller system. For small and hobby projects a 4x4 (hex) matrix keyboard is sufficient. The keys in the matrix keyboard are arranged in a matrix arrangement in order to utilize the port pins....
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Design a Colpitts Oscillator in a common collector configuration using a single BJT. Provide base current to get the transistor operating properly, and you can do this using a potential divider (between Vcc and gnd): use resistor values as high as possible....
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This be the circuit delays to have for a long time. By use the integrated circuit Timer 555 or Ultra-Long Time Delay By IC Timer 555 by R2 use for fine the frequency of pulse from the integrated circuit NE555 bring divide by wasp with 4017 each 10 in the end....
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Actually did (do) have access to the resistors but yes measured open (disconnected from any ground source or input source)....
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Computerized infrared remote project a very simple device for recording and playing back streams of infrared data, in particuliar the codes transmitted via remote controls, software is supplied to be run in both DOS and Windows, with information on....
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This circuit is the High Input Voltage regulators, which generate voltage 5V. In these circuit LM340 input voltage must remain within the limits specified in the data sheet. If the device is operated above the absolute maximum input voltage rating, two....
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Electronic equipment is not `cheap` and can be damaged in a number of ways, by electro-static discharge, by lightning and by transmitting withno antenna attached, or into an antenna with a high SWR. The controller described herein attempts to facilitate the....
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Building a serial voltage meter to measure from 0 to 5 volts DC is actually pretty easy. Using MeLabs PicBasic, and Microsoft`s Visual Basic Version 5 Pro. You need Visual Basic Pro version because you will have to use Basic`s MSComm control. This control is....
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Volt meters & ampere meter with PIC can be used to measure voltage and current simultaneously. The series of volt meters & ampere meter with PIC16F876A PIC is used as a data processor voltage and current are measured. This circuit uses the viewer in the form....
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I was prototyping for the OpenRelief project. Based on a simple ionisation chamber, initial testing used a bank of batteries for the bias power supply and this post details the construction of an inverter to replace these. For details of the detector itself....
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The full-scale deflection of the universalhigh-input-resistance voltmetercircuit shown in the figuredepends on the function switch positionas follows: The term IFS in the aboveequations refers to meter`s fullscaledeflection current rating inamperes. It must....
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Sun tracking systems are very effective in increasing the efficiency of photovoltaic (PV) arrays, and are essential for concentration PV systems. The following paper discusses a light tracking servo model which has been built to simulate the movement of a PV....
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This "Super Light Sensor" responds to minute fluctuations in light level, auto-adjusting over the range from about 200 lux up to 60, 000 lux (ie, from a modestly lit room to direct sunlight). It has lots of potential uses - eg, detecting a car entering a....
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By using two 4516 ICs, this circuit will simulate two dices playing game. ..
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Originally Posted by kajunkreations The natural resonant freq of the L2 is 31.5 mhz. I calculated the 40K by using LC meter and LC resonance....
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This circuit was industrial to power an AVR microcontroller from a 12 opposed to run-acid battery. The watchdog itself draws solitary 14 µA. Of avenue, at hand are dyed-in-the-wool ICs, in lieu of model from Linear machinery or else Maxim, which can subsist....
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This module is HC-06 a slave mode serial bluetooth data link. The chips is made by CSR. In this project, my mobile phone will talk to AT89C2051 via HC-06. All the complication has been put in the cage (in the java library and bluetooth module), so what I....
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A cat deterrent with an Arduino, something akin to this. I have figured out detection, and now realize that I need to use an ultrasonic transducer to produce the `blast` that I need...