Popular Circuits Page 254
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A quad op amp makes up the heart of this function generator. Ul-a generates a square wave, and outputs this to J8. J1 and J2 are pulse outputs obtained by differentiating the square wave. Integrator Ul-b generates a triangle-wave shaper to obtain a sine wave...
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Constant Temperature Circuit. (C) G. Forrest Cook 1997 Introduction This circuit is a generic low power temperature controller that can be used for stabilizing temperature...
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It is often desirable for a single doorbell to be operated by two buttons, for instance, one at the front door and the other at the back door. The additional button, S2 in series with the break contact of relay Rel, is connected in parallel with the....
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The circuit is placed parallel with the exit of power amplifier and us gives the level of signal ,from output. Changing resistance R1, in the input circuit, we adapt the indication of power, in the resistance of loudspeaker, that we use..
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The laser diode ·pulser is a simple drive circuit capable of driving the laser diode with 10-A, 20-ns pulses. For a 0. 1 % duty cycle, the repetition rate will be 50 kHz. A complementary emitter follower is used as a driver. Switching speed is determined by....
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The microcontroller won`t be able to drive the gate of Q1 very hard (usually GPIO pins can only source a few milliamps) so your turn-on and turn-off will be very slow. This will limit how well your high-side switch will behave. You don`t have a....
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A8V W8EXI 6CL6 One Tube Transmitter. The operation of the 6CL6 transmitter is actually quite sophisticated....
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This analyst is, a sensitive instrument, in the frequency changes and width of a acoustic signal. Thus the brightness of LED that turns on each moment of is proportional signal width, while the colour of proportionally frequency....
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This is a small but quite powerful FM transmitter having three RF stages incorporating an audio preamplifier for better modulation. t has an output power of 4 Watts and works off 12-18 VDC which makes it easily portable. It is the ideal project for the....
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This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5....
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This is an image Schematic. No Description available...
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This be Power Pulse Generator Circuit, by use the integrated circuit NE555 be Square wave Oscillator Generator. Fine the frequency done to a turn R1. From that time send output go to still transistor 2N2222 control give IC LM350T work have voltage come out....
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A Left and Right source of audio are first pre-emphasized (HPF) and then fed to adder circuits. The output of one adder is the sum of the two signals, or the L + R signal (the monaural signal), and the output of the other adder is the difference of the two....
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The circuit illustrated produces a short duration of rapidly-sequencing tones, invoking the stereotypical sonic imagery of a sophisticated computer, such as would be scripted for the science-fiction genre. I designed this circuit for use in the composition....
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The amplifier of this design is 30 Watt and is suitable for microphone-inducing. It accepts a crystalline microphone and can be used for speeches, lectures, as a transmitter modulator and generally where it can be useful as a common frequency amplifier. The....
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Due to their low cost, stepping-motor controllers are often chosen over full-blown, software-driven controllers for a number of applications. However, stepping motors provide rather low torque at high speeds, thus they usually require a starting ramp to....
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This is a simple electronic siren circuit, which can be used in many circuits where the need of siren is required. The circuit is very simple using only two transistors and few other components and it will generate siren sound when power is applied. Use 8....
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This is a very simple project using a printed circuit board and 8 components. It will flash an ordinary 3mm or 5mm (1/8" or 1/4") LED at a rate of about one flash per second. This circuit works on the basis of a high-gain amplifier being driven into....
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The Link Telephone Intercom. The Link circuitry is simple and efficient, employing just two ICs, half a dozen transistors, and a handful of garden variety components. It all runs on 12...
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This circuit provides accurate full-wave rectification. The output impedance is low for both input polarities, and the errors are small at all signal levels. Note that the output will not sink heavy currents, except a small amount through the 10-K!J....
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The design uses a proximity detector rather than a pushbutton switch to eliminate the need to mount and wire any equipment outdoors. The circuit worked well in this application and other applications...
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This is the circuit of LED color fade effect. Just like the name of the circuit, the light intensity of LEDs in this circuit will fade from high intensity to low intensity and then off. 30 uF condensator and the resistor marked with blue 100k control the....
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Hello, I need a simple to make LED based (not 7-segment) voltmeter to monitor the voltage of a variable supply. I have found this circuit....
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This digital DIY tachometer for bikes uses two reed switches to get the speed information of the bicycle. The reed switches are installed near the rim of....
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In the original circuit, a three-diode string was wired in series to R10. Two of these diodes are now replaced by a red LED in order to achieve improved quiescent current stability over a larger temperature range. Thanks to David Edwards of LedeAudio for....
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The use of pulse width modulation (PWM) is common for the use of controlling power to a particular electrical device. Motor speed control, LED contrast control, power supplies are some of the example usage of PWM. 18 series PIC always come with a CCP module....
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Bong ordinary differential amplifier circuit and the difference circuit is that it has made a voltage-current conversion circuit rPl constituted with R. And Rl o of the OP ampl..
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This Circuit of FM radio-controlled anti- theft alarm can be used with any vehicle having 6- to 12-volt DC supply system. The mini VHF, FM transmitter is fitted in the vehicle at night when it is parked in the car porch or car park. The receiver unit with....
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Fact is that the Nixies need a particular cathode current to entirely light up the cathode at all. If you just reduce the anode voltage the current through the anode resistor drops and so does the cathode current. Up to a certain point where the cathode is....
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This transmitter sends an FM signal in the 88-to 108-MHz range, with a tone of 19 kHz. This can be used to activate the FM MPX pilot carrier indicator, which can be interfaced to external devices. L4 is for use with a 15 CM wire antenna. L1 is 9 turns of #26....
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6V, 9V adjustable current power supply circuit shown in Figure 12-9, using fewer components, easy to assemble, the output voltage of 6V, 9V adjustable output l J current can re..
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AD594/595 can also be configured to Celsius, the circuit shown in FIG. This time should be IN +, IN- terminal and COM shorted, the output voltage Uo temperature coefficient of ..
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Switching Voltage Regulators-Step up, Step down, and polarity inverting configuration, working, and circuit diagram....
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There is a voltage divider composed of R2 (10M) and R3 (100K) which effectively divides the voltage across C2 by about 100. Also note the ground of C2. It is connected to the inverter ground for reference. I used an LM358 comparator to keep track of the....
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after the success of making a data acquisition box for our porsche chumpcar where we were able to collect lap times and telemetry data during our auto club speedway race weekend i decided to create a new ioio box tailored to my turbo this will likely also be....
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The Supertex HV440 is used for implementing a pulse width modulated high voltage ring generator for telecommunication applications. The HV440 CAN operate in both closed-loop or open-loop. A closed-loop design is more complex but provides better load....
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One of my student has made a disgraceful robot that used two stepper motors and with a simple IR sensor. Yes, above picture is what I`m talking. Without battery carrying, a little bit torque of the stepper and misalignment of driving shaft, makes it crawling....
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This machine`s playfield features a catapult that fires the pinball, trolls that pop up from the playfield, and an exploding castle with a drawbridge and iron drop-gate. All the plastics were replaced with a New Old Stock (NOS) set from Marcos Specialties. I....
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Your TVT-MOBI-2 will only display this static image and will not yet react to any data received by its serial interface. With one exception. You can set the internal clock of the TVT-MOBI-2 by supplying a date and a time value, and it will calculate the day....
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A 80m (3. 5 - 3. 9 MHz) SSB transceiver using a Collins 455 kHz mechanical filter in the IF chain. Such designs need some good front-end receiver selectivity in the form of at least a couple of selective tuned circuits. I`m also planning to build a simple....
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The wire speed DC motor is constantly receiving about 20 volts, regardless of the state of the switch on the nozzle handle. I checked the switch with an ohm meter. The switch works fine. I even disconnected the switch from the circuit board. The motor is....
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The meter came from eBay, and has a 1 mA full scale movement. It was already marked 0 to 100. I simply removed the original scale, scanned it, and added the "% NETWORK" markings over some of the original ones with an image editor. I then printed the new....
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The layout design of the TIQ Flash ADC follows closely with the shown circuit diagram. A row layout is designed, and the rows are stacked. A row consists of a comparator, a gain booster, a 0-1 generator, and a ROM (one row)...
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To build astepper motor tester, the circuit contains two sets of drivers that can support both unipolar and bipolar stepper motors. The control circuit and driver circuit are in separate power supplies that can work on a wider rangeof different power....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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This circuit is intended to indicate the power output level of any audio amplifier. It is simple, portable, and displays three power levels that can be set to any desired value. IC1A is the input buffer, feeding 3 voltage comparators and LEDs drivers by....
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In the circuit, NE555`s oscillation frequency is controlled by the VT2, and during its pin 3 in the low output waveform (output waveform of the T1 period), as VTI stops, VT2 is conduction with current Ic2 flowing, and the size is controlled by the output....
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This circuit is an amplifier for small transmitters operating in the UHF band, specifically in the 450-800MHz range. The amplifier works in class A and we used the well-known Philips BLW33 transistor for its manufacture. The construction, although simple,....
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Until Willow Garage was acquired, I was working there as a Web Robotics Engineer. Really, it`s just a title I gave myself for a full-stack engineer who deals with the issues of real-time, distributed robot control. I`m on GitHub, of course. My most popular....
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The intention of the following application shows how the NE5517 works in connection with a DAC. In the application, the NE5118 is used—an 8-bit DAC with current output—its input register making this device fully µ-compatible. The circuit consists of....
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Ql and Q2 constitute a simple, high-speed FET input buffer.·Ql functions as a source follower, with the Q2 current-source load setting the drain-source channel current. The LT1010 buffer provides output drive capability for cables or whatever load is....
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This NiCd battery Charger can charge up to 7 NiCd batteries connected in series. This number can be increased if the power supply is increased with 1.65V for each supplementary battery. If Q2 is mounted on a proper heatsink, the input voltage can be....
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The monitor senses an ajar door and, if the situation isn`t corrected within 20 seconds, sounds a beeping alarm. The circuit is controlled by a magnetic reed switch and magnet on the door. With the door closed, the switch is closed and the alarm is disarmed.....
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This is a PIN diode based RF signal attenuator circuit operates with 1MHz 500MHz input. PIN diodes are one of the most common parts used in RF applicati....
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Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the opamp and energize the relay and light the LED. Swapping the position of the thermistor and 47k resistor makes a cold or frost alarm....
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Join the forum discussion on this post This is a simple home telephone ringtone generator circuit which is built with applying only several electronic components / parts. It generates simulated telephone ringtone and requires only DC supply....
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Tum on a game, computer, videodisc player, or whatever, and its output takes priority over the antenna-derived signal-the antenna is disconnected and the alternate source is fed to the monitor. When the alternate video source is no longer detected, the....
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This circuit was created for digital cameras. It`s known the digital cameras have considerable power consumption. For example my camera Minolta E223 requires approximately 800 mA. In practice a mains power supply or high capacity NiMH accumulators....
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The circuit uses a 741 op amp operating as an inverting amplifier to amplify the voltage produced by an 8-ohm speaker used to detect any sounds. The feedback resistor R3, a 1-megohm potentiometer used to vary the gain of the amplifier determines the....
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74hc573 is used to store data so that the previous content on SS is not vanish when we disable LE pin. T0 select the proper latch 74hc238, 3x8 decoder is used. And to convert BCD into decimal, 74ls48 converter is used. Note that latches U1 to U4 are....
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The SD card can be talked to with three different transfer modes: 1-bit SD mode, 4-bit SD mode and SPI mode. According to Wikipedia, all cards must support all three modes except for micro SD where the SPI mode is optional. I will nonetheless try to read my....
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A stator coil connection Shows the structure and connections of the stator coil, and FIG. (A) shows a triangular connection, Figure (b) shows a star connection, star connection..
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To send the Sony command "TV - mute", the command would be infraout 1, 20. Note that device should always be 1 when used in PICAXE projects and data can only be between 0 and 127, as the SIRCS protocol only specifies 7-bit capability. The full program for....
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National LM195 power transistor is turned on and off once per second for flashing 12-V lamp. Current limiting in LM195 prevents high peak currents during turnon even though cold lamp can draw 8 times normal operating current. Current-limiting feature....
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This circuit uses "and other potential triggers" Circuit. The so-called equipotential trigger means crystal bidirectional thyristor trigger, whether positive or negative trigger,..
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LCD modules have become a popular way to Display system messages and status in embedded applications. This application note shows how to Interface an SST FlashFlex ® microcontroller1 to a typical character LCD module. The SST FlashFlex is an....
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HS101/HS201 are a pair of tiny radio transceiver components. The working frequency is 280MHz. It is suitable for digital signal transmission. The control distance is 30 ~ 100m. All the components including the antenna are packaged in one. It is easy to use.....
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This circuit turns-off an amplifier or any other device when a low level audio signal fed to its input is absent for 15 minutes at least. Pushing P1 the device is switched-on feeding any appliance connected to SK1. Input audio signal is boosted and squared....
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This circuit is designed as per a request made by Mr Vinoth from India. His requirement was a 12V/5A DC fan motor controller. I think this circuit is sufficient for this purpose. Quad 2 input Schmitt trigger IC CD4093 is the heart of this circuit. Out of the....
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COMSOL, adding SPICE® elements into its FEM, gives the possibility of a direct modeling of oscillators: triode and load are FEM described while all the other components of the circuit are just simulated using SPICE ®. The modeling is not a straight....
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The moisture detector uses two transistors and a piezoelectric transducer to sound an alarm tone when water is present. Transistor Ql forms a crystal-controlled oscillator, using a portion of piezoelectric transducer XDCwhich contains two piezoelectric....
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This circuit is a circuit diagram 12V inverter is very easy to build, cheap components that many electronics hobbyists may even already have. Though it is possible to build a more powerful circuit, the complexity caused by the very heavy currents to be....
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The ignition process in any vehicle becomes the heart of the entire system as without this stage the vehicle just won`t start. To initiate the process, earlier we use to have the circuit breaker unit for the required actions. Nowadays a more efficient and....
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The presented speakers are distinguished for their small dimensions and their extraordinary sound. Our home space is often limited and prohibitive for large speakers. This limitation does not mean that we will stay without high Sound Quality. Its design is....
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A special category of preamplifiers, they are the preamplifiers that undertake they amplification the low exit of Moving coil head, so that its drive to a input PHONO [RIAA] of preamplifier. With the moving coil heads, exist certain problems which it should....
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VU (Volume Unit) meters used to be the mainstay of audio metering systems, but they have been replaced by LED metering in a great many mixers and other applications. Even in software, the most common level meter is made to look like an LED meter. The Peak....
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The current out is Iqut—Vin/R. For negative currents, a PNP can be used and, for better accuracy,-a Darlington pair can be substituted for the transistor. With careful design, this circuit can be used to control currents of many amps..
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Is this a transmitter? Medium-wave short-wave consists of three transistors. The transistor AF115, along with the rest of its circuitry, is the oscillator of the device. The circuit of the two OC72 is the low-frequency amplifier (modulator), which forms the....
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The circuit below was developed to guard the fish pond. In this case to prevent that the pump sucks just air when the waterlevel get below the pump. When the waterfilters get saturated and dirty, the water level behind the filter gets to an unacceptable....
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The main component of this 3 band graphic equalizer is LM833 produced by National Semiconductor. LM833 has a very low noise, and a band / amplifier of 15MH....
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This Am radio receiver circuit is based on the TDA1083 radio IC that can be used to build a simple MF band radio. This AM radio schematic circuit based on the TDA1083 will work in 300kHz 3MHz frequency range. This AM radio receiver circuit is very simple and....
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This option has the advantage that one does not need to change anything in the receiver itself. However, since any filter will give some attenuation of the signal, this will degrade the noise figure of the receiver, and thus limit the weakest signal which....
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This is my DIY build of the Boozhound Laboratories JFET Phono Preampifier, but on a stripboard. The BHL preamp is based heavily on the Le Pacific RIAA phono preamplifier circuit shown below for reference. This is a strip board construction using brown....
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Unlike LED light, a laser`s light output is more concentrated, meaning it has a smaller and more narrow viewing angle. This means it must be directed at its source more directly in order to be picked up. Laser light is also monochromatic, meaning laser light....
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This is Security alarm. If somebody disconnected the wire loop The speaker will generate a sound. I have used a circuit for my land. Then when a robber enter for my land i can know it earlier. when you setup this set the wire loop at the height of 1 feet....
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The code I used on the ATtiny85 is now included as tiny50hz example sketch in the Ports library, eh, I mean JeeLib. Here are the main pieces: Nothing fancy, though it took a fair bit of datasheet reading to get all the ADC details set up. This sketch....