Popular Circuits Page 161
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Using the TB2922HQ audio power IC can be designed a very simple and high efficiency power audio amplifier electronic project . TB2922HQ is 2ch BTL audio amplifier for TV or home audio applications. It includes and the pure complementary P-ch and N-ch DMOS....
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Low-drift solid-state design for 40-meter band has maximum change of only 25 Hz from cold start to full warm-up at 25?. After stabilization, maximum hunting is 5 Hz. Drift is minimized by paralleling two or more capacitors in critical parts of circuit.....
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Varies speed and direction of 5-amp reversible series ac motor in accordance with d-c control signal. Polarity of control signal determines direction of rotation. Gain potentiometer adjusts slope of speed versus control voltage curve. -M. P. Southworth,....
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Figure (a) and (b) show the two 2MHZ basic oscillator circuits. According to the circuit structure, it can adjust its best operating point by testing....
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As shown in FIG dividing circuit, A1 composed of a voltage-controlled current source, A2 is a voltage comparator, A3 composition active low pass filter. When the time constant ..
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This is flashing blinks circuit, 12V sizes. By use fluorescent lamp the small-sized.It live the work of relay perform be the circuit modifies from DC to be....
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The EMD SD45 was manufactured starting in 1965 so that it represents one of the newest prototypes available in Large Scale. SD45`s are still running all over the country, but they are getting fewer over time due to very high miles in the last 30 to 35 years.....
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The oscillator output of the XR-567 can be amplified using the output amplifier and high-current logic output available at pin 8. In this manner, the circuit can switch 100-mA load currents without sacrificing oscillator stability. ..
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The electronic lantern control circuit adds high-efficiency dimming and flashing to an existing battery powered lantern orflashlight or to a custom design. For the car it makes a great lamp for changing a flat tire, back seat reading or emergencyengine work.....
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This LED lamp was originally designed for use on a budget solar-charged 12V electrical system. It is bright enough for comfortable reading at night and features constant LED brightness with diminishing battery voltage. The circuit uses six high-brightness....
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This example describes a wireless remote control switch, with reliable operation, simple and practical features, can remote..
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In this lab we will be using flip-flops. Xilinx offers a large library of sequential circuits. Make sure to check it out when searching for circuits: Xilinx Refernce Library. The circuit we want to implement in this lab is a sequential circuit controlling 3....
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The I2C PIC Interfacing Tutorial 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 18F452, 24LC02B and....
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Dynamic microphone uses a moving coil around magnetic field to convert mechanical movement into electrical signal. The ordinary mini speaker is turned into a....
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As can be seen from the three-phase voltage waveform diagram [Figure 2- 76 (a)] When one of the phases voltage from positive to negative over the zero point, followed by a phas..
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This active splitter for laptop audio-out is powered from a USB and provides individual channel gain of 39 dB and individual volume control of a head-phone channel. The circuit uses two TDA2822M audio power amplifier ICs for head-phones/small speakers. Each....
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The following schematic shows the Simple Motorcycle Alarm Circuit Diagram designed and drawn by Ron J. It uses micro-switches to protect removable panels and....
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Great LM111 / 211/311 power supply voltage range ( 5V ~ l5V), bias current, offset current, the differential input voltage range ( 30V), whose output is compatible with TTL, DTL and MOS circuits, and You can drive LEDs and relays . ..
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This sound frequency meter circuit is simple to build and can be constructed in a portable format. In can measure frequencies with a minimum level of 10 mV...
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This circuit is a Hartley oscillator, as identified by the fact that the feedback to the JFET transistor (Q1) is supplied by a tap on the tuning inductance (L1). The position of the tap is usually between and 35 percent of the total coil length. A buffer....
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It shows the dynamic AC signal level display drive circuit can be used for audio level display driver...
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Consider the need to vary two voltages, V1 and V2, by an equal percentage of their ranges (V1MAX - V1MIN) and (V2MAX - V2MIN), with V1MAX, V1MIN, V2MAX, and V2MIN independent of each other. The first idea that comes to mind is to use ganged potentiometers....
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Here is an ultra simple automatic light switch circuit for bedrooms. After construction, connect the input terminals of this circuit in parallel to the int....
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Fairly early on in my work with high-power LEDs such the Luxeon 1 and 3 watt devices I considered that PWM (Pulse Width Modulation) techniques would be an interesting means of modulation the LED. In theory, this should be capable of producing the lowest....
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In spite of the improvement of communication link and despite all progress in advanced communication technologies, there are still very few functioning commercial wireless monitoring systems, which are most off-line, and there are still a number of issues to....
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Siren Circuit. This circuit is to generate sound siren when S1 is pressed and increate sound frequency because charged C1, S1 is released when the frequency decreated...
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Most cards of sound in computer, are deprived stereo input for microphone, on the contrary have stereo input for high level [ Line ]. The circuit uses the input Line of card of sound, in order to we place a two mono stereo microphone, in the input of card of....
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This circuit is used for remote photographic flash units that flash at the~ame time as the flash attached to the camera. This circuit is designed to the trigger cord or hot shoe connection of a commercial portable flash unit and triggers the unit from the....
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FIG resistor divider attenuation measured mold humble way signal for higher signal amplitude situation. ..
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The AV combination as shown in lo-2, the first stage Philips TDA1029 four-input switching signal for the switch; the second stage uses NE5532 as preamplifier, B of the NEC, the company pPC18 92..
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Here is the circuit diagram of IC Controlled Emergancy Light With Charger or simply 12V to 220V AC inverter circuit. The circuit shown here is that of the IC controlled emergency light. Its main features are: automatic switching-on of the light on mains....
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In this project we`ll be using the ATMEGA16 @16MHz. But as every project. it must have something special, something to be able to look different from other. But what I `ve seen many robots with photosensors (photovore, photophobe), many linefollowers, many....
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The following schematic diagram shows the design of a 100 MHz Radio Frequency RF Oscillator Circuit. The electrets microphone picks up and amplifies sound then fed it into the audio amplifier stage built around the first transistor. The output from the....
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The circuit is only suitable for fundamental crystals as there are no mode suppression components. The oscillator transistor Q104 is cutoff most of the time except for a short period at the peak of the crystal current waveform. Q103 regulates the dc....
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As shown in FIG constitute grounds L4970A power switching power supply. L4970A is a high-power monolithic integrated switching regulator, the chip uses SIP-15 package, which is..
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Hydrophone is similar with microphone, except that it is used in underwater environment. Off course a hydrophone can be used to pick up sound in air, but it will be less sensitive since it`s mechanical-acoustical properties is design to match the acoustical....
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This is simple intercom circuit. Here I have used common Ic LM380. Now the switch is in the talk position for the speaker on the left, And the other persons position is listening position. If other one wants to speak The switch must be change to another....
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This Circuit uses a CD40110BE, Up/Down Counter IC's. This IC is able to Source Each Segment with 25 mA, Giving a Very Nice Bright Display. The 7 Segment Displays MUST be a Common Cathode Type, as I have used here. All the UnMarked Resistors should be at....
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Ql and Q2 switch the primary windings of transformer Tl via a square wave at a frequency determined by its magnetic properties. Diodes Dl and D2 provide base return paths for the feedback current of Ql and Q2. The output winding of T1 is connected to a....
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STANDBY/ON switch below is appropriate for applications (industrial and telecom, for example) in which the circuitry must remember its state (STANDBY or ON)...
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Most dimmers use pulse width modulation (PWM) to control the amount of power that is delivered to the lamp. Those that come bundled with a switch faceplate control the firing angle of a Triac on the 240V mains side. These work fine with resistive loads but....
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Stepper motors are a subject that keeps recurring. This little circuit changes a clock signal (from a square wave generator) into signals with a 90-degree phase difference, which are required to drive the stepper motor windings. The price we pay for the....
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This circuit has `suffered` a lot of modifications over its long life... Even the lettering on the integrated circuit was partially erased of the years.
The main motive of the mods was not that the circuit didn`t work right, but were several tries to add....
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The MAX712 and MAX713 are nickel cadmium (Ni-Cd) battery fast charge controllers which will fast charge batteries from a DC source at least 1V higher than the maximum battery voltage. 1 to 16 series cells can be charged at rates up to 4C. A voltage-slope....
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If you build fused-filament-fabrication parts (the technology that RepRap uses) at room temperature, they have a tendency to curl as they cool from the bottom up. This is caused by higher layers shrinking as they cool and bending the already-set lower layers....
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This is speed motor controller circuit of 12V DC motor. You can adjust the speed of rotation of the spindle motor from 5-60 cycles per minute. The work of....
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Flicker free updating of analog input and status of switches using Ajax and the Arduino Ethernet Shield. The Arduino Uno is set up as a web server....
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It is common that sometimes we need to power some devices σuccessively one after the other. This function forces us to handle a large number of switches, which are located where the access is difficult, especially in the case of informational devices and....
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Thanks for putting these schematics up, the different circuits look like they`ll be useful for many projects. The CV section alone, is vastly usable. Brilliant! I am in the very beginning stages of making a mighty benjolin PCB with Rob himself. I`m crossing....
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Here`s a simple light activated police siren using light dependent resistor and NE555 timer. Before you make this project, I would recommend you to make the following projects. The 555 timer with R1=68K(say timer1) is configured in slow astable mode and the....
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As shown for the electronic watchdog circuit. It has the ability of ordinary dog guard the house. Whenever someone enters the door 10 meters monitored area, it will send out a ..
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This simple and easy to make circuit is a 5 LED VU Meter based on LB1409 IC from SANYO, which will indicates the volume level of the audio signal it senses. SUPPLY 12V DC @ 50mA. PR1 REF SET. PR2 AUDIO LEVEL SET..
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Circuit Hello HELLO! Are you deaf Do you have disco ears ` If people ask you this and you`re still well below 80, you may be suffering from hearing loss, which can come from (prolonged) listening to very loud music. You won`t notice how bad it is until it`s....
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The parallel arrangement of LED backlights allows the control IC to utilize inexpensive low voltage CMOS processes as shown by the followingcircuit diagram which requires two to six white LEDs (WLEDs) in parallel. In many applications, LED backlights have....
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Timing interval is initiated by applying power, and is determined by RT-CT. At end of interval, unijunction transistor triggers silicon controlled rectifier, to apply essentially full supply voltage to load. Delay range is from 0. 4millisec to 1 minute.....
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This Design Idea provides a simple, inexpensive, portable circuit as an alternative to a microcontroller to provide a wide-range source of low-distortion sine waves for audio-circuit design and debugging. Although sine waves from DDS (direct digital....
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An op amp used as a comparator produces a 10-V p-p square-wave output with 100-mV input, to 15 kHz. Adjust R5 for symmetry of square wave at low input levels..
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This is a bit of an unusual one because I`m not even sure what it is. It`s based on a schematic done by Analogguru and is obviously a Cornish buffer in front of a booster, so what I am assuming is that the Guild Brian May is the treble booster, and the whole....
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It uses KD153 type "ding-dong" music IC, issued a "ding-dong" sound alarm. d = 221611 " There /dianlu/safe/201303/160666.htm" refrigerator door alarm circuit...
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Newman MP4 machine has three atj memory, a data memory is used to store data U7 # - one is used to store the MP4 machine work program program memory U} 8 = The last parameter is used to store user settings user memory U9. Data memory circuit arrangement in....
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A positive transient, such as the power switch closing, charges r through L to a voltage above the supply voltage, if Q is sufficient. When the current reverses, the diode blocks and triggers the SCS. As the capacitor discharges, the anode gate....
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This article is for those who wants to make their own car amplifier. The basics of calculation will be discussed below. If you have understand it you will be able to make car amplifier yourself. Actually the difficulty of designing the car power amplifier....
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There is an advantage in using continuously active PWM signals. The main reason is that the asynchronous frequencies of the PWM core and microcore can sometimes result in a forshortened PWM pulse. The Sevo reconizes this as a command for a new positions and....
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Two soft start power supplies. The output voltage slowly increases to the desired output. The output voltage rises slowly and reaches 15 V in 5 seconds.
In order to perform this soft-start function, the LM317 voltage regulator IC requires an external....
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When you`re copying videotapes, it`s sometimes desirable to suppress some passages. Using the pause control of the recorder does not yield satisfactory results. Another method produces better results (Figure 1). The video source connects to the video-in....
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The XR-T8205 Tone Ringer is primarily intended as a replacement for the mechanical telephone bell. The device can be.powered directly from telephone ac ringing voltage or from a separate dc supply. An adjustable trigger level is provided with an external....
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Carrier current remote control device or intercom circuit diagram as follows: ..
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A simple FM Radio circuit with diagram and schematic using IC TDA 7000. This low cost single chip fm radio circuit design is easy to make and is suitable to make a FM portable radio....
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The circuit above makes use of the CMOS 4017 decade counter IC. Each depression of a switch steps the output through 0 - 9. By coupling the output via an AND gate to the next IC, a predefined code has to be input to create the output. Each PBS switch is....
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Public Lab is an open community which collaboratively develops accessible, open source, Do-It-Yourself technologies for investigating local environmental health and justice issues....
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This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up to about 30KV, depending on the transformer used. It is cheap and easy to make, thanks to the standard TV flyback transformer used. It can power LASERS (although....
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This circuit was designed to allow a laptop computer to be powered from a solar power setup. The computer requires 12V at 3. 3A. The circuit is a linear regulator with Mosfet Q4 as the series pass device. A 100kO resistor provides Q4 with a positive....
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The preamplifier is intended for use with dynamic (moving coilMC) microphones with an impedance up to 200 ? and balanced terminals. It is a fairly simple....
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The way that this receiver works is very similar to the way that we as humans beings work. We see colors and we act depending on the different things seen. The phototransistors does the same thing, if reacts depending upon the intensity of infrared light....
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This is my reincarnation of the EH Small Clone and Roland CE-1. Unlike the Clone it has a proper depth control. It also has a switch to change between the CE-1 like 512 stage delay and the Clone's 1024 stage delay. Current consumption is very low and the....
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The fan employed is one of the new electrostatic type which is very reliable, because it contains no wearing parts. These devices require high-voltage drive. When power is applied, the thermistor, located in the fan"s exhaust stream, is at a high value.....
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The original firmware is usable on the amateur radio bands, but is not very convenient to use. Wulf-Gerd, DL1FAC has developped a new firmware that is much more "ham-friendly". It is open source. With this firmware you can change the frequency as you like,....
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This circuit employs a synchronous demodulator to separate a 1 KHz signal from noise and measures the amplitude of the 1 kHz signals once a second at about 60 microvolts per count then sends the measurements via an RS-232 interface for further processing or....
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A simple 3-way crossover, intended for triamping Hi-Fi systems. This is a conventional 12dB / Octave unit, and cannot be expected to have the same performance as a Linkwitz-Riley aligned filter network. It will still be a vast improvement over nearly any....
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The DPT Transmitter is a dual powered Voice Transmitter that came about from quite a few request for a transmitter that would function both at power when long range was needed and with a "switch that could be thrown" for a smaller battery consumption when....