Popular Circuits Page 267
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The LV2282VA is an FM Transmitter IC. MPX block makes stereo modulated, composite signal from L and R sound inputs. RF VCO include FM modulation function. Audio AGC function keeps FM modulation well regulated. PLL 2 synthesizer determines RF output frequency....
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Hello, I`m a noob to this forum, and also to circuit design. I`m also interested in a specific project and I thought I`d try to glean a bit of....
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The following article takes the knowledge of advantages and disadvantages of the pipeline architecture and compares its features with four of the most popular architectures (flash, dual-slope, sigma-delta, and successive approximation) for analog-to-digital....
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Both ac and dc motors in modern industrial systems often receive their control from PLCs (programmable-logic controllers) in a control room safely away from the process. If an operator must manually set the motor speed while observing the process, the....
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As the robot`s battery voltage would slowly drop, the servo`s centre point would drift. After a while, one or both servo motors would begin to creep even though they should have been stopped. Secondly, servos are designed to hold a position and not a set....
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If you want one small lamp that flashing for general to use. I have many ways, But today you see this three of the lamp flasher circuits. Which it has....
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BLW96 is a HF/VHF power transistor intended for use in class-A, AB and B operated high power industrial and military transmitting equipment in the h.f. and....
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The following circuit is the combination of echo chamber circuit that will make the sound repeated, just like an echo sound when you speak in cave. And the robot voice effect circuit that change the audio signal from input to become sound like a robot voice.....
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Continually monitors battery voltage during use and consumes only about 250 ? A (until the end point is reached). Near the end point Trl turns off, allowing Tr2 to illuminate the LED to increase current drain further leading to a distinct turn off point...
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The circuit generates square and triangle wave. I wonder if I can add a couple of diodes and a potentiometer to be able to skew between triangle-ramp/saw and change the duty cycle of the square wave Is it that simple..
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Colour Organ Videos Complete instructions this episode Weekend Projects can be found Fifteen years ago I bought a box from my uncle Here`s what it does....
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The DTMF infrared remote control circuit. The DTMF encoded signal can be decoded by the special decoder and the PLL audio decoder LM567. But the DTMF encoded signal which is decoded by only one decoder, has only one frequency, one group of control signal is....
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Precision frequency counter/tachometer. The ICM7207A provides a 1-second gating window and the store and reset signals. The display reads hertz directly. With pin 11 of the ICM7207A connected to V+ the gating time will be 0. 1 second, which gives tens of....
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Remote, noncontact, measurement of the speed of rotating objects is the purpose of this simple circuit. Linearity and accuracy are extremely high and normally limited by the milliammeter used and the initial calibration. This circuit is configured to count....
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The hardware configuration when using multiple 1-Wire temperature sensors like the DS1820 is very simple, as illustrated in the block diagram below. A single-wire bus is used for communication between the microcontroller and the temperature sensor. It is....
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Current leakage protection is currently the most used and best leakage protection device. Current leakage protector fork into electromagnetic and electronic two, two leakage pr..
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The circuit in Figure 1 performs active voltage-to-current conversion or acts as a variable-gain current mirror with high precision and bandwidth. A typical application is testing high-speed ICs or other devices that have inputs designed to be driven from....
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To be independent of the local radio stations for testing VHF receivers, you need a frequency-modulated oscillator that covers the range of 89. 5 to 108 MHz ” but building such an oscillator using discrete components is not that easy. Maxim now has available....
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The circuit generates a clock synchronized with the pulse width of two clock pulses, a random pulse width from the input pulse width of the clock pulse five times...
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A circuit such that the microcontroller can toggle a GPIO pin and shut the whole system (including microcontroller itself) down. And when the user presses a momentary button, the power is brought back up again. The circuit is normally powered down. When the....
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This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this....
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The EIA/TIA-423 Unbalanced (Single-Ended) interface; specifies a single, unidirectional driver with multiple receivers (up to 10). ". Specifies the electrical characteristics of the unbalanced voltage digital interface circuit, normally implemented in....
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High-energy capacitors of the type discussed can produce hundreds of amps when short-circuited, possibly causing severe burns, fire and/or property damage! Please be aware of these hazards when using these capacitors and take precautions to avoid....
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The regulator delivers 100-V at 100 mA and withstands shorts to ground. Even at 100 V output, the LT317A functions in the normal mode, maintaining 1.2 V between its output and adjustment pin. Under these conditions, the 30-V zener is off and Ql conducts.....
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This application note describes the operation and features of the FAN7601. This device is a BCDMOS programmable frequency current mode PWM Controller which is designed for off-line adapter applications and auxiliary power supplies. To reduce power loss at....
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Composite pipe can be reduced to promote the adjustment of the control current of the tube. ..
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It`ll work on single supply. I`ve used it when I ran my lunetta on a 9 volt battery for a while and it`s still loud and proud running on my new regulated 5 volt wallwart. If you want one with input gains (to plug in guitars or mics), I made a modified....
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Using two CA3450 op amps and a CA3227 transistor array, this circuit will accurately full-wave rectify sign..
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This is a follow up to an earlier post I made here. Below is the relevant portion of the schematic for this issue (stuff to the left of Y1 is in original post if necessary). I have finally gotten this circuit working somewhat reliably with one exception. The....
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This little circuit can be used to dim lights up to about 350 watts. It uses a simple, standard TRIAC circuit that, in my expirience, generates very little heat. Please note that this circuit cannot be used with fluorescent lights...
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Two-phase hybrid stepping motor dynamic voltage 12 to 48V, the current is less than 5A outer diameter of 35 to 86 mm. This drive using the drive`s current loop subdivision control, the motor torque ripple is very small, low-speed running is very smooth,....
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The telemetric physiologic monitors transmit measurements of bodily functions from beneath the skin of a live animal to a receiver beneath the animal`s cage. The smallest transmitters the company makes, are their " mouse " transmitters. These were of....
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Two-Tone Siren Circuit Schematic Using One IC Circuit This circuit is intended for children fun, and can be installed on bicycles, battery powered cars and motorcycles, but also on models and various games and toys. With SW1 pos....
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This is a simple 12v power supply circuit diagram. It has a fixed voltage output and it based on LM7812 voltage regulator IC....
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As part of the DBS 800 System, this Audio signalling processor will provide an inband Tone signalling facility for PMR Radio systems. Signalling systems supported include Selcall (CCIR, ZVEI I, II and III, EEA), 2-Tone Selcall and Dual Tone Multi-Frequency....
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One of the best RF amplifiers ever published was Wes Hayward`s post mixer amplifier in the Progressive Communications Receiver. It quickly became known as a great high level RF amplifier. With a standing current of 50ma, it takes a very strong signal to....
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Frequently, the output current of an operational amplifier is inadequate for the application as, for instance, when a s..
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This transmitter works in the short waves from 6MC / S to 22MC / S. Coil L1 is the short wave oscillating coil of the 6SA7 lamp and you will find it ready for trade. Capacitor C1 is variable with a capacity of 0-500pF. The coil L1 consists of 13 coils 3cm in....
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This 1-Wire MicroLAN [1] uses a capacitor and diode half-wave rectifier to provide parasitic power from the data line for the station's various sensors and to transfer data (see Figure 1). Each sensor has a unique serial number that identifies it to the bus.....
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This volume controller equalizer electronic project is designed using LM1036 DC tone volume controller with volume and balance circuit for stereo applications. The four control inputs of the LM1036 volume controller provides control of the bass, treble,....
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This power-stingy combination of an audio codec and touchscreen-interface controller now comprises a differential or two-channel microphone input with automatic level control, a two-channel audio-line input, a separate monophonic-audio input, a PC-"beep"....
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Operational amplifiers are undoubtedly the easiest and best way of performing a wide range of linear functions from simple amplification to complex analog computati....
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For months I`ve been looking for a simple FM BUG project, the ones online require inductors which you either have to acquire or build, if you don`t have a LCR meter it becomes rather hard to get the circuit working, specially if you`re a beginner without an....
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This is an image Schematic. No Description available...
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In contrast to traditional small-signal approaches, the use of large-signal, time-domain design techniques helps deliver low-noise grounded-base oscillators for VHF/UHF applications....
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This project is a 12-bit digital I/O extender using the Microchip PIC18f14k50 microcontroller which connects to an USB host port. The microcontroller is available in through-hole DIP20 and SMD packages, too. NOTE for beginners: PIC18F14k50 is a general....
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This simple charger uses a single transistor as a constant current source. The voltage across
the pair of 1N4148 diodes biases the base of the BD140 medium power transistor. The base-
emitter voltage of the transistor and the forward voltage drop across....
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Twang is a guitar sound that more or less approximates a banjo or mandolin. The circuit produces unusual sounds from an ordinary electric guitar by cutting the bass, severely distorting the midband and highs, and then amplifying the distortion...
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This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding. The transformer contains a single turn primary with a low 0. 001-ohm resistance. It can easily handle 30 amps....
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The circuit diagram shown here is a very sensitive wireless relay switch that can be used to control the working of home appliances like flush system, hand dryer or else. The wireless switch described here needs no remote control for its working. You only....
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These are two - easy to build - relay-based alarms. You can use them to protect your motorcycle - but they have many more applications. If you use relays with 6-volt coils - they`ll protect your "Classic Bike". Both alarms are very small. The completed....
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So far, we have considered the oscillators which use L-C tuned circuit that causes a phase shift of 180 ° due to inductive or capacitive coupling in addition to a 180 ° phase shift produced by the transistor itself. The oscillators employing L-C elements,....
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Anti-saturation devices deleted: UAA4002 routine applications, switching transistor transistor (switching transistor driven) base current is adjusted automatically, driven powe..
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Converter consists of four quad bistable latches activated in the proper sequence by the digit strobe output of the LD110. The complemented outputs (Q) of the quad latch set reflects the state of the bit outputs when the digit strobe goes high...
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This is necessary to set the 10K potentiometer while pointing the device at your TV to block the IR rays from the remote. This can be done by trial and error..
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CD 4047 is the low power Monostable / Astable Multivibrator that requires only an external capacitor and a resistor to give the output pulses. The values o....
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The 20-W + 20-W stereo amp consists of two complete, separate 20-W RMS bridge-type amplifiers. The input signal source is brought into the amplifier through the voltage divider network, which is made up of Rl, R2, and PI. Resistor Rl provides a load....
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A Very Simple "Beat Frequency Oscillator" type of Metal Detector.
These are about the Simplest of all Metal Detector types,
But still quite useful for many Detecting applications.
And although this one is particularly simple, I find it works very well...
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This is a less expensive, and DIY option for a hearing aid. It is not a substitute for a real hearing aid that an audiologist would prescribe. Amplification of all sounds and frequencies, or constant use in loud environments can cause additional hearing....
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A large area photodiode and current to frequency converter combined in a clear plastic 8-pin DIL package. The output is a pulse train whose frequency is directly proportional to the light intensity. The output is CMOS compatible (use a 3k3 pulldown resistor....
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100W RF power amplifier circuit built with 2 BLY94 transistors. If you want to see more rf amplifiers check the list bellow. Components Active components:....
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Inverter or ondulator, is an electronic circuit used to turn direct current (DC) into alternating current (AC). The function of an inverter is to change the voltage of entry of direct current (it normally comes from a battery of 12 or 24 Vdc) to an alternate....
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Using the following PMOS FET switch regulator output, in series with the regulator`s load as shown in the picture below is the most simple method. Switch....
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This PIC16F84a based repeater (DTMF) controller is very simple & economical to build. It also gives you hand-on experience of using & programming PIC Micro controllers. Controller measures 10cm X 6 CM and may be housed in your repeater project enclosure....
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As it can be seen from the figure, + DC Solid State Relay (SSR) of the input stage is an opto-isolator, when the switch output is high, by inverting driver circuit goes low, so..
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As the continuous growth of global vehicle production and owned, the problems brought by vehicles are conspicuousness day after day. These problems are much more serious in China. Thus developing zero emission electric vehicles have become the main....
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This type of charger couples RF from L2 to an external pickup coil. The pickup coil connects to a rectifier and battery to be charged. This idea is handy because no wire or contacts are required. L2 is 10T #24 wire and L3 is 10T #30 wire...
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By adding a flyback winding to a buck-regulator switching converter (see the figure), wliich is essentially a 5-V supply with a 200-mA output capability, a 12-V output ) can be produced. The flyback winding on the main inductor (forming transformer Tl)....
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In this circuit, data at input C is amplified by IC2 and then fed to modulator IC1. IC1 g..
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This simple device allows two computers to share a single USB printer or some other USB device, such as an external flash drive, memory card reader or scanner. A rotary switch selects the PC that you wish to use with the USB device, while two LEDs indicate....
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This intercom box takes input from any 2-way radio (FRS, GMRS, etc), cell phone, and a stereo audio source and amplifies them for listening via a headset in your helmet. The headset is a modified Chatterbox stereo headset. The standard Chatterbox mic is....
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Figure 1 presents an alternative to the typical boost power regulator. A buck-converter IC, IC1, generates the higher voltage that the white-light LED needs. An internal buck power stage connects between VIN and PGND, sourcing current to output Pin L. This....
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A simple and interesting project of a light activated LED circuit, which will light up an LED when receives light. The circuit is very easy to build and using only six components. The photoresistor is performing the light sensing task. The transistor 2N2222....
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This project is an experiment of the Digital Signal Processing with a cheap microcontroller instead of an ordinary digital signal processor. Recent 8 bit microcontrollers have sufficient processing performance so that they can be used for simple audio signal....
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The piezo speaker, MICl, picks up the incoming ultrasonic signal and feeds it to the base of Ql. The two-transistor booster amplifier, Ql and Q2, raises the signal to a level that is sufficient to drive one input of this most unusual mixer circuit.....
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Schematic and description to make fm transmitter. It is a simple fm transmitter circuit with minimum components but it has a long range. ....
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This Fm rf ability amplifier has 2 transistors from Philips : BLV 10 and BLW 87. The 2 rf transistors assignment in chic C and this fm amplifier has a absolute accretion of 21dB ( 100 X ) and ability 55 65%. One low canyon clarify with 9 apparatus ensures....
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This is how to make a trimet. The parts you need are: 3 Capacitors, a 2N3904, a 2N3906, a resistor(1k to 10k ohm), a solar cell (minimum 3 volts),....
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Gate F4, F5, F6 together form a low frequency oscillator, driving high brightness light-emitting diode flashes,..
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Ok. So I`ve bought and sold 10 MK3 Jettas and 1 MK3 Golf. Never posted on a forum before. I paid $400 for a 1994 GTI, in order to fix it and sell it, so theres that. The car ran 2 years ago, when my friend was driving it home from 2.5 hours away, it died on....
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Capable of 2kW peak and a minimum of 1.5kW continuous, it has to be said that this amplifier will blow up any speaker connected to it. Regardless of the claimed power that various drivers can handle, they can`t. To put this whole issue into perspective, take....
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Antenna is the means by which a wireless operator puts his signal into the space and also through which he picks up the signals of the stations with which he wants to communicate. Hence after having a good Receiver and a Transmitter (or Transceiver), the....