Popular Circuits Page 266
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The ac line-operated on/off controller is a simple, reliable solid-state alternative to a motive driven cam switch. Time 1 and time 2 are programmed by diodes to be 8 hours and 20 hours respectively. The TIM1 output is buffered by a transistor to supply gate....
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I hacked together a quick and dirty Arduino MIDI-to-DMX control for our robot band Science Fiction Children. It`s really simple! And here`s how I did it. I have two really cheap LED Par56 from Stairville (DMX controlled), a simple DMX-Dimmer pack and use....
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Using LM380 and few external components can be designed a simple audio amplifier that has many features like : wide supply voltage range, 150k © input impedance, low distortion, 1. 3A current capability. ..
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Circuit shown in Figure 3-98. Motor starting and low-speed operation is controlled by a switch SA. Adjust the time relay KT, the motor can be changed from low speed to start hi..
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DC 12V Battery Charger Circuit Diagram. This circuit is a high performance charger for gelled electrolyte lead-acid batteries....
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Circuit characteristics: O simple phase shift range 180. PRACTICAL range of 170. ; influenced by temperature, suitable for small power, less demanding situations. ..
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This circuit is a basic function of the FET 2N3819, which acts as a switch. In the conduction and not conduction. It runs contrary to the transistor. The....
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Bedini student, Rick Friedrich, presents his set-up and results, claiming that in the process of moving charge from one battery to another through the motor system, that this system can achieve a net energy gain, harvesting energy from the environment....
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Circuit shown in Figure 3-178. It withered speed torque motor for continuous casting machine, the circuit from the main circuit, trigger circuit, manual and automatic control s..
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Timer circuit has been used in many projects and there are basically 2 types that are used these days. One of them is the use of analog RC circuit where charging of the capacitor circuit determined the T of the circuitry. This type of circuitry has larger....
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This project describes how to build a "soft touch" switch. By "soft touch" we mean that you have to push once to set device ON and push again to set device OFF. This kind of switch works by latching a relay to ON state with push of a button and with another....
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This is probably the simplest radio transmitter that you will find anywhere. It has a total of five parts and can be constructed into a very small space. It is great for science fair projects or other science related projects where short range transmission....
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This is an improved IR remote control extender circuit. It has high noise immunity, is resistant to ambient and reflected light and has an increased range from remote control to the extender circuit of about 7 meters. It should work with any domestic....
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The following diagram is the Clock Generator circuit diagram which build based on NAND Gate logic IC. You may use IC 7400 or 4011 for this circuit. The 7400 is a TTL type, while 4011 is CMOS type. IC 4011 is cheaper than 7400 but the 7400 is faster than....
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FM Modulator circuit is a simple FM modulation circuit using IC 555, where the resulting modulated signal has a tenuous meeting depends on the signal frequency information. The resulting signal can be spelled out quite nice and stable so that the result will....
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When the system is placed in a shop or mall, logos and product advertisements are a perfect complement to temperature information. For home use, photos of the kids at the beach or should the temperature drop- in the making of Mr. Snowman are a nice gift for....
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This FM transmitter circuit is small, similar to our previous single chip FM? transmitter, but this FM transmitter is monophonic. You can see in the circuit`s...
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A circuit and arduino code to approximately emulate a ScratchBoard ; there is sound, light, a button and four sliders but it isn`t a drop-in replacement. remember to change the COM ports in the Arduino IDE and in Scratch so that they are not competing (if....
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An audio mixer is a handy circuit that will combine two or more audio signal sources into one signal channel. The figure shows an audio mixer that is built around the LM3900 CDA. The crux of this circuit is the three input networks, principally R3, R4, and....
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This circuit has stable threshold characteristics from its dependence on the-photo diode current in the Ll4Cl to generate a base emitter voltage drop across the sensitivity setting resistor. The double phase shift network supplying voltage to the ST-4....
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With many audio systems consisting of separate units, you ll often ?nd that due to economic reasons only the amplifier has a remote control receiver modul....
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The TPS61040 is a highly integrated, low power, boost converter capable of delivering
output voltages up to 28 V. However, using a coupled inductor enables the TPS61040 to
be used in applications where higher voltages are required. Output voltages up to 75....
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RF Wireless Data Transfer communication Circuit diagram.we implemented a wireless communication interface one point to another by means of RF technology...
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An oscillator circuit of this nature. Often used as a clock circuit. This circuit uses a million crystal frequency control with stability. And....
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Posts from PCB Schematic Design with DxDesigner tagged DxDesigner...
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It is intended for use as a dual audio power amplifier in battery-powered sound players. Specifications of TDA2822M are low quiescent current, low crossover distortion, supply voltage down to 1. 8 volts and minimum output power of around 450 mW/channel with....
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The device emits ultrasonic sound waves that sweep between 65, 000 and 25, 000 hertz. Designed around a 556 dual timer, one half operated as an astable nultivibrator with an adjustable frequency of 1 to 3 Hz. The second half is also operated as an astable....
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For designers of radar or sonar echo-ranging systems, an echo imitator can ease development and adjustment chores by generating a controllable pulse that's similar to an incoming echo signal. A decade ago, you'd probably use several 555 timers and their....
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This circuit provides for accurate half wave rectification of the incoming signal. For positive signals, the gain is 0; for negative signals, the gain is — 1. By reversing both diodes, the polarity can be inverted. This circuit provides an accurate output,....
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The 82C55 and 7 segment decoders on the display board will be changed to a group of shift registers on the display board, so that the 82C55 and the large number of wires won`t be needed. The ADC0804 will be replaced with a serial interface ADC chip, and the....
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It`s a classic designing of final amplifier 35 W, with two EL34 in push-pull, from the Siemens and Halske, with year of designing 24/3/1953 and code SV410/1. The amplifier it worked from 1954 until 1989, whenever it came also out except operation, with mean....
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This is a circuit diagram of amplifier circuit, these circuits have a 10W audio power amplifier using TDA2003 IC from SGS Thomson popular. The IC can easily provide 10W into 4 Ohms load at 18V DC supply voltage. IC can also be operated from 12V and that....
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This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors. The Holtek HT-2811 is available....
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This circuit measures the power -supply current of a circuit without really having a currentshunt resistor: R1 is only 3 em of #20 gauge copper wire. A length of the power distribution wiring can be used for Rl. ..
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The LTC®1605 is a new 16-bit, 100ksps ADC from Linear Technology. Its outstanding DC accuracy and ±10V analog input range are ideal for industrial control and instrumentation applications. Its simple I/O, low power and high performance make it easy to design....
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Read the generic sound level from an Electret Microphone. I`ve seen a number of schematics with NPN transistors, that will provide an inverted output (~5V when quiet, ~0V when loud, linear operation in between). However, I would like non-inverted output....
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This is circuit for audio equalizer that is very common as commercial products (for Hi-fi, car audio and stage use) but circuits for them are very rarely published. This circuit is like as equalizer bands. Here`s the circuit diagram of the audio equalizer....
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This is a simple schematic which can be assembled to control a lamp with a Sony TV remote control. Circuit uses a PWM signal connected to photocoupler which isolate the power part from microcontroller. Power part has very interesting solution on how halogen....
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The circuit is shown in receive mode, PTT switches to transmit, the speaker serves as a microphone and speaker. All systems I`ve seen use a Rocking Armature Transducer for the speaker. There is no base station or similar - you can just connect two or more of....
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Power is supplied by continuous voltage, not always stabilized (applied to PWR + and -) at a value between 5 and 32V; such voltage is filtered at the bottom by the diode protecting against polarity inversion (D1) through condensers C1 and C2. Fuse F1 enables....
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This scheme named Audio Mixer a real very simple and component easy to be got, generally circuit Audio Mixer is used with a few IC, but at this Audio Mixer circuit only requires transistor as its brace. For good result applied preventive reactor with....
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This circuit uses a switched capacitor filter IC from National Semiconductor to filter signals with frequencies higher than the 3KHz needed for voice audi....
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If resistors R1 to R4 are variable, the signals can be mixed in any proportion, meaning at any volume levels. And overall volume can be set by a variable resistor in series with Rf. ..
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As shown in Figure as a + 24V, 1.9A power supply circuit. It 5G14D domestic integrated voltage regulator as the core, three external power transistor, output current from the p..
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Not drive a solenoid directly from your Arduino. It requires more current than you can provide and produces destructive voltages when it is switched off. There is a simple solution. The solenoid I was testing with is a 12 volt solenoid the size of my thumb.....
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The LinkSwitch-LP family is designed to replace inefcient line frequency linear transformer based power supplies with output powers < 2. 5 W in applications such as cell/cordless phones, PDAs, digital cameras, and portable Audio players. LinkSwitch-LP may....
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Usually a single telephone is connected to a telephone line. If another telephone is required at some distance, a parallel line is taken for connecting the other telephone. In this simple parallel line operation, the main problem is loss of privacy besides....
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With pulse operation, the solenoid is energized momentarily with five to six times its rated voltage, then held in with less than half of its rated voltage. Application time is reduced drastically and the reduced holding voltage produces less arcing when the....
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Because NiCad batteries maintain a constant output voltage, it is difficult to determine how much of the battery"s charge remains. The circuit provides a way of determining the capacity of a battery by draining it at a preset current to its depleted voltage....
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Each line key has three positions. Centralised it connects the line circuit to line to await a call. Downwards (KK) it operates a K relay which switches the line through to the common equipment. Upwards (KL) the line is connected to the line tester. The....
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To operate car audio (or video) system from household 230V AC mains supply, you need a DC adaptor. DC adapters available in the market are generally costl....
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This PIC16F877 microcontroller tutorial answers the question, "" How to implement a digital clock using PIC16F877 ? "" Using PIC16 simulator (Proteus) you ca....
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A couple of USB DACs but no one have I2S output. Some people doesn`t need S/PDIF input and they want only USB. With these requirements is unnecessary to convert signal first from USB to S/PDIF and next to I2S for DAC. This board have analog headphone output,....
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Circuit shown in Figure 5-60 in Figure 6 by the operational amplifier IC op amp set up a channel pre-amplifier to compensate for the loss of tone control circuit caused by inse..
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Circuit works as follows: the high frequency part of the antenna to receive AM radio to a radio-frequency signal amplification crossing, elected by this vibration level 465kHz ..
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It can change the frequency range, and the oscillating signal is adjusted by potentiometer RP1. Since the output resistance is very low ( 1K ©), it issuitable for various kinds of control circuit as a source. In the circuit, the transistor`s collector....
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This highly sensitive movement detector is designed from bipolar transistors and draws a curren..
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Clock oscillator is typically used digital signal processing circuit and a microprocessor circuit (digital signal processing circuit is a microprocessor). Digital signal transm..
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On this page we will discuss the power electronics needed for our EDM machine. The basic mechanism of electrical discharge machining is a controlled spark between the electrode and the workpiece. This part of the electronic design generates the waveforms....
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As I was developing my IR Extender Circuit, I needed to find a way of measuring the relative intensities of different Infra red light sources. This circuit is the result of my research. I have used a photodiode, SFH2030 as an infra red sensor. A MOSFET....
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Utility vehicle anti-theft alarm circuit as shown. It is mainly composed of two major anti-theft alarm circuit parts and components. Security circuit: When the car owner left the car, it will be placed on anti-theft switch S B, and make the....
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Here is the schematic diagram for a 20 Watt driver. I developed this circuit in 1985, and used it to build a lamp that found much use both as camping light and as emergency light during the then-frequent power outages.
The two transistors work as a....
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This is an UHF bandage TV antenna preamplifier circuit With 15dB accretion to body easily. It is formed based on BF180 UHF Transistor. The aboriginal date is an bandage canyon clarify complete by the C1, CV1, L1, L4, C7 and C3, the additional date is a....
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The part of the hardware mainly finishes the magnification of sound, when the sound is enough large, have measured on can lead this signal into the one-chip computer ing. The hardware makes up the frame picture and is shown by 1-1. Mainly made up of CPU,....
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This high power class D audio amplifier electronic project is designed using the TDA8920BTH audio power amplifier IC. This power amplifier audio IC has a very high efficiency with very low dissipation, providing a very high output power. The typical output....
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Here is a simple circuit using IC LM 350, which can be used for charging 12V lead acid batteries. This circuit is perfect for constant charging 12V lead acid batteries. The circuit is designed as a constant voltage source with a negative temperature....
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This be simple Adjustable voltage regulator power supply circuit, at use integrated number circuit TL431. By from the circuit can fine volt 3V - 30V, depend on....
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Here is a 12 volt lead acid automatic battery charger that shut off the charging process once the battery attains full charge. This prevents overcharging o....
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All of ACC`s repeater and remote base products support control of synthesized remote base transceivers. One form of frequency control supported is compatible with transceivers using thumbwheel frequency selection. The controllers supply BCD (binary coded....
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When you press a start button, the arduino picks a random 4 diget code and flashes lights to show the code. When you repeat the code in the other buttons, the XBee will send a message to the other XBee, which will ring the bell. int bell=5; void setup(){....
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Using an intersil ICL 7106 A/D converter chip and an LED display module, this gauge uses a Sensym Corp. pressure tra..
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Between fixed loudspeaker that period. Its outer diameter must be consistent with the paper tube diameter to facilitate fixed speakers, and in its outer open on a walk trough, ..
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According to kind of draw the circuit diagram shown in Figure 5, 220V AC power after the capacitor buck diode rectifier to lead-acid battery charging, the red LED for charging ..
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Variable Gain Amplifier controlled by voltage, works as video amplifier. It use 3 Field Effect Transistor (FET) type U1897E. U1897E can be replaced with 2N4091..
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Adder circuit commonly used inverting input, namely the inverting adder circuit. It was to the inverting input of the operational amplifier electrical path, based on the signal..
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This project is provided as a "prototyping project" as no PC board has been produced. The photographs show the project built on a matrix board using surface-mount components and very fine wire.
The final design will require a double-sided board with....
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A Prototype Sample and Hold Circuit -The original idea for the veto front end amps was to continually sample the input pulse height and hold the pulse height for any pulses passing a low voltage threshold (~10mV). This mixed analog and digital circuit was....
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The design includes a buffered virtual ground circuit provided by an LM741, LM318 or similar Op Amp, which sets a fixed voltage half way between the input voltage and ground. This is then used as the virtual ground for the sine and triangle wave outputs from....
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Simple Surround Sound Decoder. Introduction This surround-sound decoder is based on the Hafler principle, first discovered by David Hafler sometime in the early 1970s. The original idea...
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The drive circuit of electromotor includes a FET bridge circuit, FET base drive circuit,current sensor of motor drive circuit and the relay. FET bridge circuit mainly consists of four high-power MOSFET power tubes,it requires that the power tubes have good....
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Descriptions of the various modules in a home built music synthesizer - Sub-oscillator project. ....
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This Infrared transmitter can activate IR based switching circuits from a distance of 10 meters or more. It is a high power IR transmitter driving two IR L....
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AVC - The featured circuit controls a volume line automatically. It delivers an output voltage of approximately 4 volts peak to peak. This voltage remains....
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In the circuit shown below i have configured the LCD module Command Register at address 00H and Data Register at 01H, so when ever we will write the data at address 00H, it will be considered as command for LCD, and when ever at 01H, it will be considered as....
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Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set`s aerial input via a cable. Then all that remains to do is tune the....
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A small project that will make you expert in using these displays in your own projects. We will make a system that can display any number between 0-9999 using four of these displays. We will design a function Print() that we can use on latter projects to....