Popular Circuits Page 52
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Did not bother to draw out the receiver section because it is quite ordinary. The TRIAC switch section shown below can be controlled by ordinary 4000 series CMOS logic...
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1. Driver: L298N Dual H Bridge DC Motor Driver IC 2. Driven part of the terminal supply area Vs: +5 V ~ +35 V; such as the need to take power within the board, the supply area Vs: +7 V ~ +35 V 3. Driven part of the peak current Io: 2A 4. The logical part of....
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The signal from MSP430 PWM pin isn`t quite ready to drive a speaker or amplifier. First, we can clean up the signal a bit by running it through a low pass filter. This clips the sharp edges from the PWM waveform to make it sound a bit more natural. You can....
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This is a special low voltage version of my audio preamp. T1`s emitter voltage is biased close to half supply voltage (1. 5V) to allow for maximum output voltage swing. Both transistors are direct coupled and have closed loop feedback to aid temperature....
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As I am using a Common Cathode led-strip instead of a Common Anode one as used in the above link thus I came up with this `modified circuit`. Because my experience with FETs was nihil this didn`t actually work as I would need at least a voltage => Vcc to....
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The given circuit of a current controlled LED tube light uses a couple of high voltage transistors which works on a very basic principle for implementing the required current control operation. Resistor R2 is placed forconvertingthe rising current to voltage....
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Michelson was the inventor of a unique interferometer that opened up new vistas in the science of light and optics. With the interferometer, Michelson was able to determine ” with unprecedented accuracy ” the speed of light, the wavelength and frequency of....
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2004 chev impala - unable to find the fuse for the rear defogger. I find the relay but both manual and actaul car diagram and passenger side fuse block show 30amp fuse - but nothing is there. Thanks, I check that fuse and it is OK. I see there is a circuit....
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The alarm uses a fixed-frequency piezoelectric buzzer in conjunction with the cadmium-sulfide (CDS) cell and the two-transistor circuit to provide a unique effect. Whenever light reaches the CDS photo-electric cell, the alarm is silent. But when no light....
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This transmitter uses a 741 op amp as a high-gain audio amplifier, which is driven by a microphone. The output of the 741 is coupled to Ql, which serves as the driver for a LED. Potentiometer R1 is the amplifier`s gain control. Miniature trimmer resistor R6....
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This beginner`s breadboard circuit simulates a dice being thrown. Pressing the button throws the dice. One of six LEDs will light up after the throw....
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It shows a ceramic filter composed of FM IF amplifier circuit, the FM intermediate frequency amplifier circuit mainly by the IF input variable voltage regulator T}, ceramic filters CF1,..
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This circuit outputs a TTL-compatible - pulse whenever the signal falls within the limits set by potentiometers ..
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When configured as an input there is a more subtle problem. If the input has its pullup enabled it could affect the circuitry that is expecting to see an A/D input. But if the pullupis not enabled, then when its A/D input is not selected it will be a digital....
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The circuit monitors PC keyboard activity through five-pin DIN connector J1. When the user presses a key, the keyboard sends a series of negative-going pulses on pin 2. In conjunction with Q1 and C3, the op amp essentially functions as an integrator, which....
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CXA1019 FM RADIO CXA1019 is a one-chip FM/AM radio IC designed for radio-cassette tape recorders and headphone tape recorders, and CXA1019S has the...
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I`ve had a few requests for a quiz circuit, so here is a 4 input design which can easily be modified. Maybe, I should write the application notes in the style of a game show host. This design uses four IC`s and has four input circuits and four independent....
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USB Powered, Stereo PC Multimedia Speaker Circuit Diagram. This circuit is powered by 5V DC source obtainable from the USB port of the Computer. When electrical power switch S1 is turned to on` position, 5V power supply is extended towards the circuit and....
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Typically, most japanese motorcycles do not have any charge control lamp at all and even on bikes equipped with such a lamp (Bosch system, e. g. BMW and Moto Guzzi), defects may still occur in a manner where the "idiot light" may not light up in due time.....
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How to build a MIDI interface to connect a SB/SB Pro/SB16 sound card joystick port to a MIDI capable musical instrument....
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Looking for resistor value and capacitor value for low pass filter to remove RF. The application is removing undesired untuned RF from the crystal set ....
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Audio Level Meter Description A simple and low cost audio level meter circuit that can be used to measure the audio level of your sound source. This circuit is a valuable tool for those who are interested in audio circuits. The circuit is designed with a....
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Tuned circuits consist of C4, L1, C8, L3, and the two 15 pF trimmer capacitors across the collectors and emitters of both transistors. Other NPN transistors like BC54, 2N3642, 43, etc should also work. The circuit is designed for simplicity, so No Audio ....
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A commitment by the MIC5158 to control tasks, a plurality of external N-channel MOSFET parallel output, resulting in high current or high power output linear regulator circuit ..
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Classic 6-Transistor circuit (many variations of this where around in the 1960`s & 70`s), NPN only output devices, fairly high level of Bias, single rail, input and output coupled via a capacitors (electrolytics - no less), clever feedback loop, bootstrapped....
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Here is the schematic from the Eico 667 tube tester. It is very similar to the 666, except now there are a pair of extra levers, and a few test sockets are missing. But the meat and potatoes are identical. If you are planning to restore your 667 to peak....
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Application circuit works the device as shown below. Generally shared TV antenna amplifier and power switch user is isolated. Sometimes no one can work the TV, the antenna ampl..
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This receiver is built around a uPC1373 IR remote-control preamplifier, a sensitive 30-to-40 kHz tuned detector, an automatic..
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We built a system that uses eight air-clamping cylinders (McMaster-Carr 62185K64) to push down on a piece of glass to seal it to a sidewall. A number of times, the glass has cracked. So, this project is an attempt to come up with an inexpensive way of....
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BD5460 is a low power {lass D amplifier that can be employed in low power applications like handheld audio devices. BD5460 doesn`t need an LC filter at the speaker output and can be driven employing a battery, The standby current of BA5460 is usually zero....
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A 12 Volt high current 20 Amp power supply. The output voltage is variable from 12.2 Volt to 14.4V so can be set for any device requiring voltage and current in that range. This PSU uses an LM723 as the regulator, 4 parallel connected outboard pass....
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If you`ve ever tried dimming a LED with a simple potentiometer, you know that the approach does not work very well. Just as with ordinary diodes, the voltage-current characteristic of LEDs is far from linear. The result depending on the potentiometer setting....
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This is a new gear for Radio Direction Finding (RDF) known as FOX HUNT or called Transmitter Hunting (T-Hunting) or Treassure Hunting. HAM clubs, all over the world, are conducting this SCIENTIFIC GAME occasionally, being which is the only one interesting....
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Wireless Imaging Intruder Alarm app enables Home Security Smartphones to detect and send burglar pictures direct to your personal cell phone, PDA or computer within a few seconds of a break-in at your home or business when you are away. Code Alarm Security....
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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 is an Analogue TV Transmitter. Sound modulation is type FM with a 5. 5MHz carrier and video transmission is PAL. Frequency is adjustable via C5 and tunes 54 to 216Mhz with components shown. This is suitable for countries using TV systems B and G. Please....
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A/D converter is the analog signal into a digital circuit, it has a variety of circuits, as shown in Figures 21-24 is a circuit A/D converter structure, which is the use of a p..
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This Field Strength Meter is simple and also quite sensitive. It uses an ordinary digital voltmeter to measure RF signal strength up to a few hundred MHz. The multimeter should be set to the lowest dc volts range for maximum sensitivity. This is normally....
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Common series negative feedback amplifier (2) series negative feedback amplifier shown in series is a common negative feedback amplifier. Wherein R is the resistor current nega..
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Anyone who frequently builds, repairs and tests equipment powered by mains voltage, will certainly have met with an unpleasant surprise when the plug inserted into the socket (or later) - loud explosion, destruction of equipment, flying pieces of components,....
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This is basically a flasher circuit modified to turn on and off a bulb instead of a LED. It uses a 555 timer IC working as an astable multivibrator. The flashing rate can be varied from very fast to a maximum of once in 1. 5 sec by varying the preset VR1. ..
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flasher with beeper in this site is very easy to build and assemble. flasher with beeper is build with very common components. various project using NE555 timer IC...
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Single Transistor Timer Circuit tutorial for beginners in electronics. Easy beginner electronic circuit that can be built on breadboard....
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This page describes the construction of an electric field mill. This is a device to measure the electric field strength on earth due to the static electric field and the charge of clouds passing overhead. It can also be used to investigate static electricity....
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The crystal used in the topology of Figure 1 can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poor frequency stability over temperature compared to an AT-CUT. This topology uses a parallel crystal and not a series crystal...
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FM radio antena amplifier circuit diagram. This amplifier will pull in all distant FM stations clearly. Active FM amplifier circuit is configured as a common-emitter tuned RF pre-amplifier wired around the VHF / UHF transistor MFE201. Below is a circuit....
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This security system is very important for any kinds of home, office, factor. there has a circuit diagram its simple and easy to build. Any one can do it. It`s a low cost circuit diagram. Many security systems use a closed loop of wires and switches arranged....
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This circuit is a 20W Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc. Power supply - 18 VDC. Output power - 20 W, 4 ?. IC built in Thermal Shut-down, Load dump voltage surge....
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Each J202 JFET stage provides up to 180 phase shift by 1 megohm potentiometer control. Potentiometer complete control groups. JFETs are ideal for the designated circuit, becaus..
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3GPPFDD_UE_RX is the test bench for 3GPP FDD user equipment receiver testing. The test bench provides a way for users to connect to an RF circuit device under test and determine its performance using pre-defined test bench measurements. This test bench....
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The amplifier can be used in a number of projects to buffer and amplify outputs from devices such as Direct Digital Synthesizer (DDS) chips. The board was initially produced to amplify the output of the 9833 DDS chip. The board was also intended for Amateur....
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FM Stereo decoder using TDA7388A very simple with a compact design FM stereo decoder schematic circuit can be designed using the TDA7388 IC manufactured by ST Microelectronics. The TDA7338 is a monolithic integrated stereo decoder with noise blanking for FM....
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The Uno has just sufficient memory and ports. You have to program this one efficient in case you want to store settings in memory etc. Buying the Mega gives you more memory and ports. The Shako valve uses 24 volts DC. I would prefer to use 12 volts because....
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The equivalent series resistance (ESR) of a capacitor can be measured using this circuit and an ac voltmeter. Ul fun..
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A four thyristor controlled bridge is used for operation in two quadrants of the torque-speed characteristics. In the trigger circuits the usual pulse transformers were replaced by self biased circuits which minimize gate power consumption and increase noise....
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Circuit schematic above is one of the voltage inverter circuit, starting from 6-Volt input on the DC current into 220-volt AC output. For maximum output power up to 30W only, and is also very small voltage current. Input voltage plus the entrance on the....
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The above circuit is recommended for use in SSTV applications with use of the sound card with a computer. This is the JVComm style of interface. This circuit may also be used for RTTY and PSK31 applications. Many users modify the above circuit to include 1:1....
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The EtherSmart Wildcard is based on the Lantronix Xport Ethernet device server which is built into an RJ-45 connector housing. The XPort exchanges data via a serial UART -USART interface, while the Wildcard bus is a parallel interface. A UART (Universal....
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Referring to the simplified schematic in A, the AFG is made up of 10 relatively simple circuit elements. ICl-c and ICl-d arc configured as unity-gain noninverting buffer amplifiers. The summing (L+R) amplifier, IC2-c, combines equal amounts of the left and....
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The thermocouple of the Model K is present industrial production, one kind of more common temperature sensors of scientific experiment, inner liquid steam of subject brightness range of Centigrade 0- 1 300 in various production for its all right direct....
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A negative pulse at the input is fed via capacitor Cl to the input pin (2) of the IC, Pin 2 is held slightly above its triggering voltage of 1/3 Vcc by the voltage divider comprising Rl, R2 and RV1, The negative pulse triggers the IC and the output (pin 3)....
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Sensitive FM Transmitter. Additional Notes The default for the capacitors type is ceramic, preferably the npo 1% type or equivalent. But basically nothing critical here. Use any...
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This FM transmitter is about the simplest and most basic FM transmitter it is possible to build and have a useful transmitting range. It is surprisingly powerful despite its small component count and 3V operating voltage. It will easily transmit over 300....
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We know that microcontroller is an integrated chip which consists of RAM, ROM, CPU, TIMERS, COUNTERS etc. PIC is a microcontroller which also consists of RAM, ROM, CPU, timers, counter, ADC (analog to digital converters), DAC (digital to analog..
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Hi Guys, Relatively new electronics newbie here - so thanks for your help Recently I purchased several electromechanical seven segment vane displays....
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In the some building is need to using good security. For some example is using this design circuit. The door knock alarm is a simple design for the simple security for the house. This circuit is based by sensor piezoelectric wafer for detected the alarm.....
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This is a simple Water level alarm circuits made using 555 Timer IC. Circuit will produce an alarm when the water level reaches a preset level....
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The circuit was designed to create a portable and sensitive regenerative receiver that will be suitable for shortwave band listening. Shortwave (SW) a t....
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Another cause of voltage drift is the input current of IC1, which slowly charges capacitor C1, this can especially be seen when the output voltage is about 0 Volt...
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This project uses a small, common electret microphone to convert audio to an electrical signal. These are the cheap microphones found in most PC headsets. The microphone output must be amplified and zeroed before it can be recorded with the MSP430. This is....
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This simple circuit senses heat from electronic devices and gives warning alarm. It is an ideal add on circuit to monitor heat in CD players, Amplifiers etc. The circuit uses 14 stage ripple free binary counter IC CD 4060. It has an internal oscillator and....
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This simple heat sensor circuit could senses heat from various electronics device like computer, amplifier etc. and generate warning alarm. It could senses heat from environment also, but here I mention electronics device because it is being using mostly....
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Tubular Xe lamp power, high brightness, known as the "little sun." Tubular xenon lamp wiring shown in Figure 2-6...
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This 3V to 24 volt variable-regulated power supply can be adjusted from 3 to 25 volts and is current limited to 2 amps as shown, but may be increased to 3 amps or more by selecting a smaller current sense resistor (0. 3 ohm). The 2N3055 and 2N3053....
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For this article, we will use the 128K EPROM (27C128 used in the 1986 to 1989 IROC-Zs with the 1227165 ECMs) as the basis for our discussion. This purpose of this article is to educate those on a little bit of binary and hexadecimal background, in order to....
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This 860 MHz Phase Locked Loop (PLL) oscillator circuit is for 1200 MHz transverter`s local oscillator with 435MHz rigs. The oscillator circuit uses PLL synthesizer IC`s of Toshiba for PLL circuit. TC9122P is easy to use preset counter for determining....
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His oscillator sought to use resistors and capacitors instead of bulky low frequency LC tank circuits to generate audio frequencies. He obtained low distortion (<0. 5%) with the use of a two stage amplifier with enough negative feedback to set it`s gain to....
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Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio. The frequency can be tuned from 88 to about 94Mhz and the range is about 200 feet. It is extremely easy to build and....
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This oscillator circuit includes a quartz crystal that has a nominal resonant frequency of 262,144 Hz and is cut in the orientation that gives a large linear coefficient of frequency variation with the temperature. In this type of circuit, the oscillation....
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This unit uses a Nicad battery to provide power to an emergency lighting setup. When power fails, T1 beco..
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This is a simple alarm circuit for a checkup with a 4001. It can be used to protect our home, motorcycle, car or any other application that comes to mind. In this circuit will be a computer simulation with Livewire and then design the printed circuit Kicad.....
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This is also remote controlled land rover but as a remote control one can use his cell phone. That means he can move the land rover by sending different commands from his cell phone. Not only that, he can control it from anywhere in the world (of course....
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This 555 timer circuit toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and....
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The cross compiler works on any host supported by GNU tools (Solaris, GNU/Linux, FreeBSD, HP/UX, MacOS X, Windows,...)...
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As shown in FIG. 1 circuit generates high voltage signal for controlling BST (barium strontium titanate) capacitors capacitance. Simply applying a voltage of V and 3V to the co..
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This sound controlled lights circuit design is used to control the brightness of the lights attached to it in sync with the sound that is being capturated....
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A 1971 lincoln continental 4dr, i am getting no power inside the car mainly ignition switch, i checked battery cables, post connectors, and fusible link by battery all check out good. all fuses in fuse box good. not sure about the circuit breakers though i....
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The 1956 Regency ATC-1 converter heralded the dawn of a new era for amateur radio. The little converter had only two transistors - one PNP, one NPN, both germanium, both now long obsolete - but they were the start of a revolution. Amateurs responding to the....