Popular Circuits Page 22
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CD4069 unit structure of FIG. 2-5 (a) shown below, it is composed of two abutment surfaces into CMOSFET, the input-output characteristics shown in Figure 2-s (b) in Fig. Becaus..
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This is The Fet Amplifier circuit. This circuit uses FET transistor. The gate of the FET must be negative with respect to the source, so a bias can be achieved in the following manner. The voltage that is across the source resistor is developed by the drain....
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The controlling range of wireless doorbell is 100M. Transmitter:- This transmitter section is designed around oscillator transistor (BF194B) T2 followed by two transistor (BC148) T1 and T3. Transistor T2 generate special radio frequency determined by trimmer....
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Generate sinusoidal pulse width modulation (SPWM) signals using the ECCP module in a PIC for generating a sine wave output for use in DC-AC inverter. I have had requests from people asking how to generate the same SPWM signals with other microcontrollers....
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The AD7740 is the world`s smallest, lowest-cost, 12-Bit accurate VFC. Since this is a synchronous converter, the output frequency is related to the fixed master Clock frequency so temperature stability is much improved over asynchronous VFCs. With a 1 MHz....
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Complementary voltage switching Class D amplifier circuit shown in Fig. Transistor VT1, VT2 are 3DA12. Among them, two of the same type (NPN) tube series product transistor VT ..
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This reference design converts 90V AC to 135V AC input, and drives seven, or eight series connected LED s from 300 to 600 mA average current. The LM3445 switching frequency is set at a nominal 225 kHz. This is a four layer board using the bottom and top....
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This example shows a tunnel diode used to make an oscillator. The two resistors bias the diode in its negative resistance region. As the current begins to flow through the inductor, the voltage across the tunnel diode increases until it hits the negative....
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It must be emphasized that the Bedini Trifilar SG or SSG are not over ‘unity (OU) systems. They are only one-to-one energy shuttle systems. They use one charged input battery to charge 4 or more output batteries. When set up properly, one pays for 1 and one....
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Well I finally got round to purchasing an Arduino Uno Open Source Prototyping Platform and first impressions are...
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Circuit LM3886 High Performance audio Power amplifier schematics Circuit Electronics, Audio Power amplifier is an important part in sound reproduction ina sound system. audio Power amplifier with this power IC LM 3886Audio Power amplifier....
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Tone is made adjustable by using multiposition switch to change capacitors in oscillator circuit. Speed (rate of change in frequency) of siren is adjusted with R3. 4700-ohm resistor in series with R3 keeps siren op-erational when R3 is rotated to....
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The diagram shows the circuit of a versatile USB power socket that safely converts the 12V battery voltage into stable 5V. This circuit makes it possible t....
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Touching dimmer circuit is shown in the following diagram. It uses finger touch control pieceto realize turning on, off or stepless adjustment for incandescent light. It is used in the dimmer of filament lamp, small AC motor`s stepless speed regulation....
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The circuit diagram of Cable TV amplifier has been published here. This cable TV amplifier circuit consists of two transistors Q1 and Q2...
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To connect two computers or connecting two HUB / switch with UTP cable, can use a crossover cable. If you connect computers to the HUB / switch, use straight cables. Straight cable is a term for a cable that uses the same standards on both ends of its wires,....
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Game-scoring display screen circuit diagram is shown as in the above picture. The circuit is composed of add/subtract scoring input circuit, add/subtract scoring circuit, counting - decoding display circuit and reset circuit....
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4027 a dual JK flip flop that has independent clock, set, and reset inputs for each flip flop used in toggle, register, and control functions due to its features such as capability of driving two low power TTL loads, logic edge clocked flip flop design,....
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This oscillator uses two transistors and operates the crystal in the fundamental mode. CT and C2 should..
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The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage and a small resistor to limit the inrush current. Since the capacitor must pass current in both directions, a small diode is connected in....
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Commonly used 3-pin linear voltage regulators, for example the LM317, cannot handle input voltages in excess of about 30V. The LR8A from Supertex Inc is a new, adjustable three pin regulator that can accept input voltages up to 450V and can supply an output....
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This circuit is easy to build and uses standard components available at any Radio Shack store. It accepts the audio tone output of a code practice oscillator or short wave receiver and converts those tones into the DC voltage necessary to operate an old-time....
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The purpose of this circuit is to animate shop-windows by means of a capacitive sensor placed behind a post-card-like banner. The card is placed against the glass inside the shop-window, and the visitor can activate the relay placing his hand on the card,....
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A very simple pulse modulator circuit can be built using 555 IC. In 555 chip, a special modulator input is available at pin 5. Here is the schematic diagram of....
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Markus built a software AM radio transmitter using the Arduino. The audio signal is fed to the ADC input through a decoupling capacitor. A PWM output pin directly drives a capacitor inductor circuit with an antenna. The schematic and firmware are available...
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This simple IR detector turns on a real LED when Q2 is exposed to invisible IR radiation found in fiber-optics systems, position sensors, and TV remote-control units. The device can be built on top of a 9V battery and held in place with RTV. Its power....
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The LA3370 is a multiplex IC for FM car stereo, and it has the following 2 functions through its utilization of the IF meter output voltage, etc. 1. Stereo noise control (SNC) under which the noise particular to the FM stereo unit in the weak electric field....
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The circuit shown is completely conventional. The Q of the filters has been optimised to allow a higher input impedance than would otherwise be possible, with the final Q of the two filters being almost exactly 0.707 (i.e. a traditional Butterworth filter).....
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To generate a system clock or auxiliary sleep clock in microcontrollers (µCs) and low-power instruments we usually use A 32kHz oscillator. A CMOS inverter....
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An electronic scale using a pressure transducer (load cell) and an analog-digital (A/D) converter to drive a digital display is shown. The scale range depends on load cell. Display is calibrated in appropriate units. Components are on main circuit and....
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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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The ADUC841 ADUC842 ADUC843 are complete smart transducer front ends, that integrates a high performance self- calibrating multichannel ADC a dual DAC and an optimized single-cycle 20 MHz 8-bit MCU (8051 instruction set compatible) on a single chip. The....
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Uses probe containing Clairex 905HN light-dependent resistance element, connected to DC differential amplifier driving meter having specially calibrated scale. Article gives calibration procedure. Switching circuit provides constant check on voltage of 22.....
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This one is particularly loud even though it runs on only two AA batteries. It uses a push-pull transformer output. This unit was manufactured with the 10K resistor at pin 4 instead of pin 3 due to a PCB layout error:..
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Hello Everybody! After a year or so of reading and drooling over other people`s wonderful projects in these pages I decided to finally make one of my....
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ICl is a 555 timer running at about 16 kHz. This IC drives Ql, a TIP146, which produces a 12-V square wave across Tl pri..
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This is a switched system, meaning it doesn`t have a sequencer like modern electric furnaces. Instead, relays are used. Maybe this is a good upgrade to make, installing a sequencer. The blower is a 5 speed blower, although only two seem to be used (unlike....
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The NE5539 wideband op amp is easily adapted for use as a color video amplifier. The gain varies less than 0.5% Irom the bottom to the top of the staitVlse. The maximum differential phase is approximately 0.1. The amplifier circuit was optimized for a 75-ohm....
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The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. As with any mixer circuit, a....
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This rf power switch operates at 1. 7 MHz with a 50-V source and load. Its on loss is 0.2 dB and its off isolation is 30 dB. It provides 40-W PEP, 45 VrEAK and 0.9 APEAK· The control input can come from CMOS, TTL, LS, etc., ..
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This circuit was designed to detect when a call is incoming in a cellular phone (even when the calling tone of the device is switched-off) by means of a flashing LED. The device must be placed a few centimeters from the cellular phone, so its sensor coil L1....
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Only one out of 9,999 possible codes has the power to unlock this simple, yet effective, electronic lock. A combination lock is not just a perfect system to protect your belongings, it is also a valid system to let everyone to know that you are vigilant: an....
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Wondered how to control the MR2 Power steering pump so that it is not a noisy power hog because it ’s always on full throttle. Designing some sort of motor controller or using a small off-the-shelf controller would not work for me. One, I ’m not that great....
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It can be simplified and you can leave out short-circuit protection if you wish. This circuit is a Mosfet-based linear voltage regulator with a voltage drop of as low as 60mV at 1A. The circuit uses a 15V-0-15V transformer and employs an IRF540 N-channel....
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This original design is a variation on a well-known design, examples of which can be found in a great many texts. My variation was to add a second differential stage to replace the usual common emitter-plus-constant current source. Doing so opens up a second....
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As shown, the information apparatus comprises buck rectifier power supply (Vdd + 12V), the timing circuit, multivibrator, the output of the first amplifier and function. IC1 an..
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It shows the use of various forms of pulse signal generating circuit operational amplifier...
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The game as originally envisaged placed the three balls as they were locked in holes on a slowly rotating ring around the Deadworld. When the third ball was locked, they were released by a mechanical arm and dropped onto the playfield. This was how it worked....
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AC Motor Speed Controller was designed to control the speed of AC motors with carbon brushes anything from drills to saws to vacuum cleaner....
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This design is based on one published by Milan Lulic in the German magazine elektroModell. Mr. Lulic`s design is for surface mount technology (SMT) construction, whereas mine uses standard off-the-shelf components, and is therefore better suited to....
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Preamplifier + tone control circuit based TDA1524A. Tone control circuit module is included in this preamplifier circuit, so you can connect the output channels directly to stereo power audio amplifier circuit. ThisRIAA stereo preamplifier uses only....
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UTC KA22427 is a one-chip AM/FM radio integrated circuit that is suitable for portable radio applications. It includes AM amplifier, local OSC, AM mixer, AM/FM amplifier, AM AGE, FM AGE circuit an....
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The schematic for this project is much more complicated than previous projects. There are four main features in our design. (1) We will be able to program the pic on the board we develop. (2) We will be controlling a servo. (3) We will be taking data input....
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Automatic Ni-Cd Battery Charger circuit is shown in the above picture. The internal comparator of NE555 is set as 4.7V by Zener diode. If the potential of pin 6 becomes higher than this value, the output of pin 3 become lower; if the potential of pin 2 is....
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You can add as many extra zones as you like to the Transistor Burglar Alarm System. The first circuit is designed to be used with the usual types of normally-closed input devices such as - magnetic-reed contacts - micro switches - foil tape - and PIRs. The....
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This circuit is built around a 555timer using very few components. Since the circuit is verysimple, even a novice can easily build itand use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this device.....
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A gas sensor (TGS823 from Allegro Electronics, Cornwall Bridge, CT 06754) conducts in the presence of explosive gases. U5 is a voltage-to- frequency converter that produces a frequency proportional to the sensor conductance. The output frequency ranges from....
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A bidirectional H bridge DC motor control circuit is shown here. The circuit is based on the IC L298 from ST Microelectronics. L298 is a dual full bridge driver that has a wide operating voltage range and can handle load currents up to 3A. The IC also....
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This post is based on the work made previously by tomek in wiring LCD displays using 4 bits. The basic idea is to group the 7 pins that are needed to drive the LCD in only 3 using a shift register. This is a cheap alternative to serial LCDs. The schematic....
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Here is a simple but effective intercom circuit that is based fully on transistors. The circuit is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the amplifier circuit wired around T1 & T2 becomes an astable multivibrator and....
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The PR4403 is an enhanced cousin of the PR4402 40mA LED driver. It has an extra input called LS which can be taken low to turn the LED on. This makes it v....
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This circuit is a wireless car alarm system that is built using two circuit modules, namely modules of transmitter and receiver modules. This circuit works on FM radio waves. Car alarms can be used on vehicles that have a 6-12VDC power supply. You can use....
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In this post, we shall be covering on how to construct a H-Bridge Motor Driver circuit using simple MOSFET`s and Transistors. The main feature of this H-Bridge is that the motor can be driven in both directions. AnH-bridgeis a circuitthat allows a voltage to....
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The TDA4661 is an integrated baseband delay line circuit with one line delay. It is suitable for decoders with colour-difference signal outputs (R-Y) and (B-Y)..
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As shown, the digital thermometer by the temperature sensor, single stabilizing circuit, counter circuit, decoding, driving and LED digital tube and other components. Temperatu..
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This circuit shows about Remote Control Circuit Diagram Through RF Without Microcontroller . Features: simple remote control circuit, uses radio ...
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This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape....
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The circuit generates a warble-tone alarm signal that simulates the sound of a British police siren. IC1 is wired as an alarm generator and IC2 is wired as a 1 Hz astable multivibrator. The output of IC2 is used to frequency modulate IC1 via R5...
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This circuit turns on a relay when two buttons are pressed at the same time.The relay backs off after few seconds, then the buttons have to be released and pressed again. This feature is often required in industrial safety...
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Without any dedicated buck converter/white LED driver IC, you can safely drive many standard Hi-efficient white LED modules using the battery power available in automobiles. Here is a safe and simple white LED driver designed for 12V automobiles. In the....
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The purpose of this digital electronics project is to record messages using a dedicated voice recorder integrated circuit. Recordings are stored in a non volatile memory cells, which means that the message will still be saved even though power has been....
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This system uses an MM5369 IC to derive a 60-Hz signal from a TV burst crystal (3579 MHz). F8 and V9 producc a 10-Hz and 1-Hz signal from this 60-Hz signal...
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This simple circuit enables you to listen to your heartbeat, for instance, while you are exercising. The transducer used for detecting the pulse is an ele....
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To make LED works, you need a voltage source that is higher than the LED`s forward bias voltage, and it`s higher that 1.5V (around 2V for red LEDs)....
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Low-frequency signals produced by transducers, measurement equipment, or data loggers often appear like the first waveform in the figure. The circuit shown operates as a tracking sample-hold, and the transients are replaced in the output by the stored value....
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SCRs are sensitive to high voltage, over-current, and any form of transients. For satisfactory and reliable operation they are required to be protected against such abnormal operating conditions. Because of complex and expensive protection, usually some....
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With this voltage regulator extension circuit you can increase the output current up to 10 A. T1 power transistor has a resistor in the emitter and thus th....
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This alarm circuit is based on two 555 timers. The alarm will sound your car horn if anyone opens the car door while the circuit is armed. The timers will allow you to leave the car without sounding the horn. To turn the circuit on S1 must be closed. To set....
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This is a simple siren sound that high power output and very noisy. ICs, Digital ICs are easy to use number CD4046 Inverter circuit and four transistor power increase current out to horn speaker 20 watt 4ohm 8ohm. Operation of the circuit when the circuit is....
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Often you find yourself in the position of needing to wind your own coil for a project, or maybe you come across an unmarked coil in the junk-box. How can you bestnd out its inductance An oscilloscope is all you need. Construct a resonant circuit using the....
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An AM receiver relies upon the original carrier signal (station frequency) having been amplitude modulated. This means the original amplitude (strength) varies at an audio rate. Looking at figure 1 we can see an unmodulated carrier signal as it might be seen....
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Beginners Tutorial 1: Building a Circuit on Breadboard - how to build a simple and easy circuit on breadboard for beginners in electronics. Learn to use a LED and resistor....