Popular Circuits Page 234
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I`m not all that clear of the difference between a data selector and a multiplexer. Although the designs I`ve been involved in stopped using small scale ICs in the early 1990`s, as the physical side of the work moved into general purpose PALs and MACHs.....
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This circuit has a 100 mV hysteresis which can be used in applications where very fast transition times are required at the output even though the signal is very slow. The hysteresis loop also reduces false triggering due to noise on the input..
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Working, schematic diagram and design of uA741 IC op-amp comparator circuit with inverting, non-inverting comparator waveform is provided....
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This article describes one reliable, simple, and universal method of interfacing MaxTrac, Radius, and GM300 series of Motorola mobile radios to common repeater controllers. Most of this information also applies to radio interfaces that are used with IRLP or....
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A very simple low power AM FM radio receiver electronic projects can be designed using the TA8122 integrated AM FM receiver, manufactured by Toshiba Semiconductor. This radio receiver circuit can be used for portable radio applications or other similar....
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This circuit shows about LM319 IC For Thermostat Circuit Diagram. Features: 2 watt potentiometer for triac power control, 10 Meg resistance ....
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When a gas leak occurs, a gas leak alarm must detect the problem immediately and issue an alarm. The gas detection sensor typically used in these types of alarms sends an amplified signal from the sensor to the controlling MCU. The MCU requires an on board....
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The current sourcing/sinking capability of the I/O pins on Raspberry Pi is quite limited. According to the Wiki page, the current limit for each I/O block (e. g. GPIO0 through GPIO27 combined) comes at only 26 mA maximum, which is only capable of driving a....
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The device is a dc switch that is normally on via the forward biasing of Ql via R3. Ql now clamps Q2 into a forward state by biasing its complement well into a saturated state via R4. The dc switch is turned off via a negative voltage above that of the zener....
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220V AC power via a resistor Rl buck, VDI rectifier, VD2 and Cl filtered output voltage of about 3V DC voltage supply manifold KD-1001 electricity. Manifold trigger terminal co..
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The device described here does just that. The circuit connects to the doorbell circuit - taking power from the 18 VAC from the doorbell transformer and switching power to the doorbell circuit most of the day. The user interface is a pushbutton, a toggle....
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By using a modified piezoelectric ceramics ashamed acoustic-electric transducer sound, light twist stairs walkway delay delayed lighting switch, circuit structure was relativel..
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A bicycle light control circuit which reads in various buttons and sets various outputs accordingly such as headlight, taillight, blinkers, etc. My current design is based around an ATtiny24 ( Datasheet ) using the internal oscillator (8MHz), programmed in C....
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Portable counter is designed with low-power logic to minimize battery drain, yet provides good performance.Since most of milliwatt power drain is taken by digital readout, circuit blanks out LED display when there is no input signal. Time base divides 1-MHz....
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Circuit shown in Figure 3-93. It is coupled with optical phase sequence protection relay. ..
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One of the largest sites for do-it-yourself guitar effects builders. Schematics and Printed circuit board layouts for rare pedals like the Tycobrahe Octavia, Clyde McCoy wah and lots of vintage fuzz pedals!....
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PIC18F4550 Communication with PC using USB HID Class, Visual Basic Communication xpress_embedo....
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DAC is short for Digital to Analog Converter. In this article we play around the code Michael Smith created for a PWM based DAC. I modified his code so that other DAC options could be tried. I compare the 8-Bit PWM DAC with the R2R DAC at various numbers of....
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The LT®3465 white LED driver is ideal for backlight
circuits in small, battery-powered portable devices
such as cellular phones, PDAs and digital cameras. The
LT3465 includes important features such as automatic
soft-start to prevent large inrush....
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A hot topic of amplifier design in the 1970s was "transient intermodulation distortion" (TIM). Other names which were used for this phenomenon were "slewing induced distortion" (SID), and "dynamic intermodulation distortion" (DIM). TIM occurs when a....
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This design used to measure air or gas flow works by measuring the energy required to maintain a heated resistance wire at constant temperature. The positive temperature coefficient of a small lamp, in combination with its ready availability, makes it a good....
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Because the common mode signal rejection ratio depends on the input transformer, it should be used or homemade good balance transformer (It should be noted l frequency increase..
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The headlights and photo cells will face the ground, so I find it easiest to imagine that the whole circuit is upside down Why 3 LEDs per side As far as I can tell, because you can`t power three in series from a single 9V battery without a little help, and....
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This circuit seems interesting and I wanted to simulate and construct it, but the problem is I do not know what do the 3 symbols in the circuit represent (1 in audio input, 1 in the middle, and 1 at the antenna). I have never come across with these symbols....
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This light sensitive circuit can operate a relay to switch on lamps or any AC loads when it senses darkness. It is ideal to use as switch less night lamps....
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Electronic potentiometer using a standard CMOS logic and analog multiplexers. Pot have low distortion (0.005% less at 1 V rms) and is it easy for beginers to Understanding. In the beginning the art Hi-Fi when in the absence of high-quality potentiometers for....
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Most of the circuitry is contained in the LM3914 dot/bar-graph driver IC chip. In addition to the comparator circuitry within the package, it also contains a stable reference supply and the drivers for the LEDs. Resistor R2 acts as the current limiter....
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Phase Locked Loop (PLL) Operating Principle with block diagram showing Phase Detector, Voltage Controlled Oscillator, Low Pass Filter....
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CX9800 models of mobile phones and desktop PC have chosen excellent performance voice processing circuit, the amplitude and bandwidth of the microphone signal is compressed to ..
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The SA607 is a low voltage high performance monolithic FM IF system incorporating a mixer Oscillator two limiting intermediate frequency Amplifiers quadrature detector, logarithmic received signal strength indicator (RSSI), voltage Regulator and Audio and....
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A 96 ford explorer. My headlights do not work. I have low lights and interior lights. I have changed the bulbs, checked the fuses, relays and light switch and they still don`t work. Any suggestins or am Imissing something Ask-a-doc Web sites: If you`ve got a....
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The Spartan-3 board has Traffic light controller with FPGA I/O pins (details tabulated below). Traffic light controller card consist of 12 Nos. point led arranged by 4Lanes. Each lane has Go (Green), Listen(Yellow) and Stop(Red) LED is being placed. Each LED....
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Semiconductor thermistor embedded thermal protection element belongs, it is sensitive to temperature,..
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The IC ELM446 is an 8 pin digital divider integrated circuit, that provides both 50Hz and 1Hz outputs from a common 3. 58MHz NTSC colourburst crystal. Externally, the designer need only provide the crystal and two appropriate loading capacitors, as well as a....
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As many or as few channels as are required can be added to the mixer. Do this by just duplicating the input "sections" which are clearly shown on the schematic. One version of this mixer I saw had 25 inputs! ..
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Looking for Stepper drivers i came across ULN2003 chip which allowed me to run the motor with minimum circuitry through the parallel port on my PC( I`m not an electronics person, hence searched for the simplest option out there). But the problem is the....
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This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for b....
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When the telephone rings. or when the handset is lifted, ~the night light is turned on and remains on while the conversation takes place. When the handset is replaced in the cradle, the light remains on for about 11 s. During standby conditions, the -28 V....
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With this circuit you will be able to monitor the quality of the mains. There are 4 distinct sections, each supervising a parameter pertinent to the quality of the supply line. The noise section consists of a 50Hz filter and a speaker where you will hear the....
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On the DMX line side a XLR connector should be used. Either a 5 or 3 pin connector. The pins/holes in a XLR connector are usually numbered so no need for a picture. For the 5 pin connector, only pins 1-3 are used. I used the following code to do some initial....
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1990 Acura Integra Starting System Wiring Diagram...
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The following voltage to frequency converter (V/FC - VCO) circuit consist of a UJT (uni-junction transistor) oscillator in which the timing charge capacitor C2....
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Converser of temperature tension. To be used with a digital multimeter with reach from -40 °C to 110 °C. With checker of the state of it laughed and a without any adjustment, thanks to LM35! The ice is founded the 0 °C and the point of ebullition of the....
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The word "pentester" actually stands for penetration tester, people who tests security vulnerabi. Most of the high-end hotels around the world rely on keycard locks for the security of hotel rooms. However, these locks may not be so secure after all as a....
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The circuit drawn pertains to a regular industrial UPS (Uninterruptible Power Supply), which shows how the batteries take control during an outage in elec....
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The required output at the inverter is 220/230V @60Hz. Basically, let me say i need an inverted circuit diagram with an output power of 1000VA. While the first circuit is a simple form of the commercial UPS, the circuit provides a constant regulated 5 Volt....
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Here it is a brand new TX300 FM transmitter. The amplifier has exactly the same architecture as TX500 with the difference that TX300 has only one stage variable VHF amplifier. It is a cute schematic that was made for all of you who wanted something even....
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The infrared detector module (GP1U52X) (Radio Shack 276-137) provides a 5 volt TTL pulse train corresponding to the digital code to the button of the remote control. In the lower circuit, the module output normally low a signal and a positive going pulse....
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In essence, it uses the same principle as a graphic equaliser, but the simulated inductors are made variable, so the frequency can be swept back and forth. The four 10K pots provide cut (when on the left or anti-clockwise side of centre) or boost, and in the....
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AC-DC power supply without power switching circuit normally used for lighting load circuit, once the power grid or power is restored, the standby power supply automatic switching immediately. Automatic switching circuit using a transistor as shown, the..
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Except for the coupling and decoupling capacitors, IC1 is a complete wideband amplifier that has a fixed gain of 20 dB to 450 MHz. No external compensation is required. since the NE5205 functions as a gain block, two or more cart be easily cascaded to....
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The surround processing section C1891A is Sony Corporation of Japan launched the four-dimensional..
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The title of this article naturally raises the question of why we think that the generous selection of fully integrated voltage regulators needs to be extended with a version constructed using discrete components. In other words, what does this circuit offer....
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Here is a simple circuit diagram of a simple musical horn using two NE555 ICs. Two ICs are wired as astable mutivibrators. The output of first multivibrator is given to the discharge (pin 7) of the second astable multivibrator. The combined effect of the....
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The simple motor optical encoder circuit is not terribly difficult however it will take some double checking to make sure you have everything hooked up properly before working the first time. The main devices used in the circuit are the 7805, 18F4520 and....
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A common power-supply requirement involves converting a 2.4- or 3-V battery voltage to a 5-V logic suppl..
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In this time I will share about the circuit voltage stablizer or stabilization using IC 7815 and 7915, with a minimum of 17. 5V to 50V input. The output of this circuit will issue with the current 15V voltage in accordance with the input. Stabilizer is also....
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I describe the procedure I followed to build the Box, the Lamp System and the Countdown System which is based on the AVR mega8 microcontroller. Four blacklight lamps, 15W each, emit radiation at the region of UVA, with a peak around 350nm where the thin....
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A pair of timer IC"s are the heart of a circuit that simulates the warbling bee-haw of a British police siren. One of the 555 timers, U2, is wired as an astable multivibrator operating at about 900 Hz. The other, Ul, operates at approximately 1 Hz. Its....
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On frequency stability, the quartz crystal oscillator circuit is very advantageous, even the the VCXO circuit with large amount of frequency changing only changes about 1%, and the linear range of control voltage to frequency variation is not wide. Although....
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The Local Oscillator stage implements a basic Colpitts Crystal Oscillator with a buffer stage to increase the signal level. The oscillator produces a signal that is at the crystal`s specified fundamental frequency. In reality, for each frequency the crystal....
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This circuits allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil moving in the speakers magnetic field will produce a small electrical signal.
The circuit is....
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Using a 555 timer to drive a CMOS counter, this device uses RCA CA3079 zero-voltage switch to control triacs TR1 through..
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The ULN2003A and Zener from the driver board inside the same device. It`s a 5 wires motor, but the one in the schematic is 6 wires. I suppose the only difference is that the 5 wire version has the two center taps joined together so that`s what you see in my....
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Hello, I want to build a system that can transmit in the FM band. I have already built my oscillators because I want to transmit at more than one....
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However since the ROM is mapped in at &F000, this in binary is %1111 0000 0000 0000; or in other words when accessing the ROM, A12, A13, A14, and A15 will always be high. Thus, the I/O device selections will always be active at the same time as the ROM....
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This transformerless power supply circuit is designed for medium current applications. During the negative half period, the capacitor C5 is charged to peak voltage network. Transformerless Power Supply Circuit Schematic The positive half wave will open the....
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This circuit is not a novelty, but it proved so useful, simple and cheap that it is worth building. When the positive (Red) probe is connected to a DC positive voltage and the Black probe to the negative, the Red LED will illuminate. Reversing polarities the....
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Figure 3-17 is a pre-equalizer amplifier having a sound recording function has the following characteristics: (1) the circuit does not have a conventional mechanical switch cir..
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Family karaoke 0K lighting design of a variety of methods to control circuit, the control circuit described here is a kind of four-way light output,..
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Fixed some issues with the benito arduino programmer and upgraded it to the latest version of the LUFA library. I hadnt noticed that there was a miss match between the. inf and the library supplied descriptors. My appoligies to the two xp users. As this is....
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The schematic for a monostable multivibrator is shown below. Like the astable multivibrator, one transistor conducts and the other cuts off when the circuit is energized. Recall that when the astable multivibrator was first energized, it was impossible to....
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As shown in overload protection circuit power 650mW, supply voltage 12V, speaker 25 ohms. Part Component Specifications: VT1: transistor NB111EH/J VT2: Transistors: NR001E VT3:..
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So you`ve read about my Computerized Room or have seen those nifty home automation products advertised in the back of electronics magazines? Or perhaps someone you know has done something similar. At any rate, you have decided to try it yourself. The first....
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This circuit operates a LED in pulsing mode, i.e. the LED goes from off state, lights up gradually, then dims gradually, etc.
This operation mode is obtained by a triangular wave generator formed by two op-amps contained in a very cheap 8 pin DIL case IC.....
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When the water-level is below the steel rods, no contact is occurring from the metal can and the rods, which are supported by a small insulated (wooden) board. The small circuit built around IC1 draws no current and therefore no voltage drop is generated....
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This following circuit shows a Lie Detector Circuit Diagram. This circuit is based on the fact that a person`s skin resistance changes when they ....
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In order to avoid any soldering mistakes, I asked students to place all there resistors in the board first, and once I checked them, they could solder away. Capacitors were next, then LEDs then everything else. The middle school class had more success with....
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Circuit switch S is closed after the integrated circuit TDA1024 trigger is turned on. Whenever the zero crossing of the mains ..
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This circuit is taken from the Progressive Communications Receiver in most of the recent ARRL Handbooks. Values for the 40 meter band are shown. If you want the ultimate in a bandpass filter for 40 or 20 meters, check out the bandpass filters in "An....
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This project is basically what I use for a quick prototype, or for just mucking about with an idea. It is easy to make, and only needs a medium size sheet of un-etched printed circuit board (or possibly two). This can usually be obtained from electronics....
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The following circuit shows about A Phase Controlled Triac (HT-32) Circuit Diagram. Features: Dsimple circuit, bilateral trigger diacs offers a ....
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Using this simple circuit, you can make an 18 LED flasher to decorate the X`Mas Tree. The White, Blue and Red LEDs flash at different rates to give a colorful display. It is a light sensitive circuit so that it will turn on in the evening Using this simple....
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This is a simple serial port buffer circuit I designed for a friend to speed up his SLIP connection in campus computer network "TRINET" of Helsinki University of Technology. The problem in the network was that the RS232 commections from rooms to terminal....
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The synchronous oscillator (SO) and the coherent phase-locked synchronous oscillator (CPSO) are universal multifunctional networks that track, synchronize, and amplify as much as 80 dB; improve SNR by as much as 70 dB; and modulate AM, FM, and FSK signals...
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Zener diode regulator is a basic electronic circuit which is very useful for those interested in hobby circuits. This circuit is used for obtaining a regulated voltageat the output which can be used for biasing other circuit elements. Now how to use zener....
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The CS4328 is a complete stereo digital-to-analog out- put system. In addition to the traditional D/A function, the CS4328 includes an 8 digital interpolation Filter fol- lowed by a 64 oversampled delta-sigma Modulator The Modulator output controls the....
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A good quality preamp tone controls, a total of three circuits. We choose to use the NE5532 is main so interesting IC, because the ultra-low noise properties, it is commonly used in many fine audio. But these circuits are old. I have a circuits of friends.....
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Shown here arc several possible interface circuits that can be used with the remote-control transmitter. The one in A illustrates a typical FM stereo MUX decoder with a load connected directly to the open-collector output of a TA7343 PLL. The circuit in....
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In Fig. 104-3(a), when Vin is between reference voltages Vi and Vu, output Vout goes low. If Vin> Vl, IC2 produces a low..
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A speaker system can be protected against amplifier failure when dc voltages (on speaker line a-b) arc sensed by the circuit. Either positive or negative dc voltages are sensed. A relay opens in this case, removing the dc from the speakers...