Popular Circuits Page 168
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The first half of the circuit (IC1a) it has an input sensitivity of 3 mV and has a frequency correction composed of C5, C3, R6 and R8. The bass signal coming from phono input is amplified while the high signal is attenuated. The selection of the input signal....
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There have described the involvement benefited LM3909 circuit, which is quite expensive. That's why I prefer to use a much cheaper known timer 555th.Involvement of the tree is a very simple scheme is to figure 2 . It is based on several multivibrator used as....
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A sequencer used for music is a device that sequences musical events for predictable playback. For early electronic instruments these sequencers often take the form of a collection of switches that are cued in series and which trigger some other device like....
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The LM1279 is a full featured and low cost Video Amplifier with OSD (On Screen Display). 8V operation for low power and increased reliability. Supplied in a 20-pin DIP package, accommodating very compact designs of the Video channel requiring OSD. All Video....
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The circuit in Figure 1 can drive high-resistance, low-capacitance piezoelectric loads at a 3-dB bandwidth of 6 kHz. It offers a low-cost alternative to commercial drivers...
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This circuit enables observation of movement between other stroboscopes. Generation of rectangular signal is based on NE555. This circuit requires a low power supply that is made from a simple transformer TR1, traditional rectifier bridge and zener diode.....
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The NanoVM is a java virtual machine for the Atmel AVR ATmega8 CPU, the member of the AVR CPU family used e.g. in the DLR Asuro robot, manufactured by AREXX engineering. With the NanoVM, the Asuro can be programmed in the popular Java language using the....
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When the supply voltage drops below 10. 2V, the yellow light emitting diode VLi light, suggesting that storage pool can not continue to discharge...
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Depending on its design an electric guitar may have anything from one to six pickup elements. Classic (acoustic) guitars could also benefit from one or more retro- ¬tted pickups. Each pickup has a specific sound depending on the type of sensor and the....
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Christmas is coming and its that time of the year again when the electronics student or hobbyists thoughts turn to making a Christmas circuit for their home and especially one that flashes a few lights. There are many circuits and kits on the market that can....
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Article for an LED driver design for automotive rear lights. Shows how dimming is best achieved with PWM and an LED driver IC that eliminates the need for external PWM signal....
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The antenna is simply a pair of vertical dipoles. The diodes in each dipole allows the circuit to select which antenna is active at any given time. When a positive voltage is sent up the coax feedline, diode D1 will conduct and D2 will block, making the left....
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This fm 88-108 Mhz radio amplifier is equiped with BLF 245 and can be user with a heatsink from a processor and cooler. The BLF 245 Datasheet can be dow...
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Choose a free schematic drawing software, and like the way these two look. I`ve read related questions about circuit drawing software as well. I like Fritzing, but it lacks some components. For example, I cannot get that RS232 component into it. Hm, what`s....
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I came up with this idea when I was in a situation where ...
* I had an amplifier with an unused RIAA input and
* I was missing another input for a standard audio signal at this amplifier.
So I designed a miniature passive network to convert a....
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This is a project for those who want to build their very own Automatic Battery Charger. This is a project made by duc_tech....
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Can be directly connected to CD players, tuners and tape recorders. Simply add a 10K Log potentiometer (dual gang for stereo) and a switch to cope with the various sources you need.
A correct grounding is very important to eliminate hum and ground....
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AD590 is shown in the basic application circuit. Since the AD590 current output, series resistance to the output current is converted to voltage. Figure 1-31 (a) for the most b..
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The above diagram shows the different links to theinputs and outputs of each operational-amplifier from the power source and how each operation amplifier is wired to operate each seperate light emitting diode. Also shows calculations to obtaining each....
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The meter has only one scale (0. 150) but this also used for 0. 75 and 0. 30. This is such a pain, and all people use a calculator with it. I made a new meter scale for it, with all ranges. This improves the comfort so much New Meter Scale for your L3-3! Due....
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Many brands and Asia ultrasonic remote control switch circuit form, the control device to perform some use of relay; others use thyristors. The use of remote control transmitter puffer type sub..
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This is a nice 2 Watts FM transmitter. It has a Super-Sensitive pre-amplification with BC109 and BC177 with more than 100% signal modulation. The job finish the 2N2219 by Motorola. For the Coils you should use 1mm wire(enameled), L1= 3 turns - 10mm diameter,....
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Street wear trench pipe installation commonly used Concealed wiring methods. The control section is installed in the front door or in the centralized..
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This diy sound activated lights circuit turns a lamp ON for a brief length when the canine barks (or a somewhat strong sound) providing an impression that the occupants happen to be alerted. The condenser microphone fitted in a place to watch sound and....
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The HV9911DB1v2 is an LED Driver capable of driving up to 20 one-watt LEDs in series from an input of 21 27V DC. The demoboard uses Supertex`s HV9911 in a boost topology. The converter has a very good initial regulation (+/-5%) and excellent line and load....
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I could use some help analysing a circuit. Specifically the frequency cut-off between the bass and treble channels. Is it 500Hz, 1KHz or 5Khz. I`m....
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Integrated circuit Ul (an NE602 double-balanced mixer) is a combination oscillator and frequency mixer. Signals from the antenna input (at Jl) are fed through dc-blocking capacitor C1 to the RF-gain control, Rl, and fed to the input of Ul at pins 1 and 2.....
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This circuit, can deliver 3 A or more and a maximum dc voltage ol` a little over 20 V. It is designed around the readily available LM317T adjustable 3-terminal regulator and has a pnp power transistor to boost the current output. The transformer has an 18-V....
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This document has several purposes, and a primary one is to record what I have learned about the means that a Scooba robot uses to detect: a) the presence of an acceptable cleaning solution being delivered to its pump, and b) the excess presence of used....
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This example introduces the switch D. C. regulated power supply circuit of buck-mode +5V series. It is composed of power supply circuit, impulsator, voltage sampling or pulse width modulation circuit, buffering driver circuit and it is showed as the picture....
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Field strength meter is a must have equipment if you`re dealing with radio transmitter electronics. Here is one example of this kind of circuit that works for...
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This amplifier has VHF (very high frequency) and UHF (ultra high frequency) response, you can use it for receiver booster for example. Here is the schematic...
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This converter also requires either a transformer or two inductors in place of the single inductor that most dc/dc converters require. You might overlook an alternative approach because the converter uses a linear regulator and takes an efficiency hit when....
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There are various approaches to analog synthesizer building, luckily they don`t vary too much in terms of the applied building blocks. The main building blocks are: oscilator (VCO), filter(VCF), variable gain amplifier (VCA), envelope generator (EG), and....
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Nowadays, a switch-off delay for the vehicle interior lighting is a naturally a standard feature. However, with certain models having only spartanttings, or older-model vehicles, you`re left sitting in the dark as soon as you climb in and close the door.....
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Circuits to interlace the Si7135 directly with two popular microprocessors are shown in Figs. 18-2a and b. The 8080/8048 and the MC6800 families with 8-bit words need to have polarity, overrange, and underrange multiplexed onto the digit 5 word. In each....
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The heart of the Chloroplast is the Motorola MC34164-3 Micro power Undervoltage Sensing Circuit (U1 in the following diagram). In normal use, this component monitors the voltage at pin 2, and applies a ground at pin 1 ( out ) when the monitored voltage drops....
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This narrowband filter using the 741 operational amplifier can provide up to 60 dB of rejection. With resistors equal to 100 K and capacitors equal to 320 pF, the circuit will reject 50 Hz. Frequencies within the range 1 Hz to 10 kHz may be rejected by....
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This microphone circuit was submitted by Lazar Pancic from Yugoslavia. The sound card for a PC generally has a microphone input, speaker output and sometimes line inputs and outputs. The mic input is designed for dynamic microphones only in impedance range....
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All you need to do is substitute transistors for the tubes used in these fundamental oscillator circuits to bring this article`s content up to date. Or, maybe you are the owner of a vintage vacuum tube radio and would like to learn a little about how things....
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A VOX is a voice-operated switch that is often used as a substitute for the press-to-talk switch on" a microphon..
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A CA3240 dual MOSFET-input device is used as a white-noise source. Op amp IC2 is used as a driver stage for the push-pull output stage formed by Q5 and Q6. Transistors Q2, Q3, and Q4 form a variablefrequency multivibrator. Rll, the speed control, is used....
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Camera power supply circuit Shows the camera power supply circuit, the normal power supply in order to make the camera work properly, the power supply circuit is composed of a ..
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The design usually involves a compromise between turn-on voltage and lamp life because the two are inversely related. One way to reach a reasonable compromise is to initially allow a momentary inrush current to warm the filaments, followed by a series of....
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The 555 feeds its output (amplified by Q1 and Q2) to the input of transformer T1, a reverse-connected filament transformer with the necessary step-up turns ratio. Capacitor C4 and coil L1 filter the input to T1, assuring that it is effectively a sine wave.....
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Even if a large number of album titles once available on vinyl are now, little by little, being proposed as CDs, not all are available and far from it. You may have treasures in your collection that you would like to burn on CDs. First, preserving a CD is....
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With transistor switching circuit shown for RCA SG2007 laser diode, pulses as short as 10 ns are possible at repetition rates above 100 kHz. Used in optical communication system in which fiber bundle or singlefiber is attached directly to laser pellet. -J.....
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Simple circuitry suitable for moving-magnet cartridges
Passive high-frequency equalization. This simple but efficient circuit devised for cheap moving-magnet cartridges, can be used in connection with the audio power amplifiers shown in these webpages,....
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This is the complete design for a microprocessor-controlled, environmentally sealed 8" video turret with two cameras, remote or autofocus, zoom control, sun damage protection, 450-degree azimuth rotation, 9-speed scan and point capability, multidrop network....
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It is a relatively simple circuit of electronic lock of safety with code of 7 digits. It should is given attention in the time that will be stepped the keys, that shape code and it does not exist it delays. With the right step of keys and if code is right....
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This is an Astable Multivibrator Circuit to alternately flash two LEDs. The R and C Values determine the frequency and the 470 ohm collector load resistors set the current to about 20 miliamp, when the circuit is operated at 12Volts. Frequncy is about 1Cylce....
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This circuit switches a printer`s USB connection from a PC to a laptop. What was needed was a method of allowing a laptop to use the printer occasionally while at all other times the printer would be connected to the PC. Instead of unplugging the printer....
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A second piece of information also came to light recently. I was aware of a story about an original Rife machine schematic which had something to do with Dr O. C. Gruner of Canada who worked with Rife throughout the 1930`s on isolating a fungal form of....
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When the SDA (Serial DAta) lines on both the left and right lines are 1, the circuit is quiescent and optoisolators IC1 and IC2 are not actuated. When the....
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Is an eight-way signal remote control selection circuit composed of ZHJ-9904 ; (B) is remote control transmitter circuit; (C) is the eight-way switch control circuit; (D) is remote control transmitter...
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LAN tester circuit diagram provided in two designs. The first design use timer IC 555 and decade counter 4017. The second design use microcontroller ATtiny2313..
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This quad amplifier is actually intended to be used in a car, but it can naturally also be used for a variety of other medium-power applications. The TDA7375A can be successfully used in all situations in which a reasonable amount of audio power is desired....
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Electronic thermometer has countless applications. Not everywhere can we use the standard mercury thermometer, for example, due to its size, frailty or the need to measure from the distance. The advantage of electronic thermometers are also small size and....
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Here is the inside of the light reflectance sensor (top) and a schematic drawing of it's circuitry (bottom). First, carefully remove the phototransistor as shown. Then, attach the three wires that we will connect to the heart sensor (show in bright yellow).....
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The circuit diagram of 7 segment counter circuit has been published here. This circuit consists of counter IC CD 4033 as its central part...
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A Power Transistor which is having a drop of 4 Volts across it and passing 3 amps thru it, may dissipate around 12 Watts of Heat, This is the problem in Series Regulators. While a Saturated Transistor or Mosfet with 1 Volts across and 3 Amps Thru will be....
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Circuit shown in Figure 3-78. The time line also use two relays to achieve automatic control, but the line structure than simple. The line can be achieved intermittently motor ..
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This is the seventh part of an ongoing series about building a low cost, open source streaming internet radio. If you haven`t already, check out the previous parts (see the links at the end of this article) for some background about the project. In part six,....
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In our first program, we will simply sweep the servomotor from CCW to CW and then sweep back. The program will be kept simple as to demonstrate the priniciples of controlling a servo with a the PIC Basic language. The schematic can be seen in figure 2....
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As shown for the LM4911 no output capacitor (OCL) power circuit. Without an output capacitor (OCL) power circuit without using squelch control (Mute), because then the shutdown..
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The circuit shown here should have a lot of applications. Basically, the distribution amplifier takes the composite video signal from a video player (VCR) or a video generator (analogue output) and buffers it in such a way that it can be simultaneously....
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EPSON PHOTO 830U printer power circuit It shows EPSON PHOT0 830U printer power supply circuit, which belongs to the switching power supply. In normal operation, the power suppl..
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This page describes a color clock that displays the time using two RGB LEDs, one for hours and one for minutes, showing time by using the standard color coding used for components (with two additional colors as the standard color coding only has ten colors....
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For convenience of use at night the receiver is provided with a scale bias lighting and the surface behind the scale has a fluorescent coating. To illuminate the scale depress button 3. Radio programs can be listened in over the earphone which is connected....
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The simple bell circuit without IC reward points: 0 | solution time : 10:20 | Asked by: Zhang Dan QiaoThanks for Related Content who simply doorbell doorbell circuit 19 music circuit, integrated circuits, transistors and resistors, respectively, what is the....
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The MIC2199 is a synchronous buck switching Regulator controller. An all N-Channel synchronous architecture and powerful output drivers allow up to a 20A output current ca- pability. The MIC2199 operates from a 4. 5V to a 32V input and CAN be programmed for....
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I have designed a simple Electric Guitar SPICE Subcircuit that includes a Signal Generator 440Hz Sine Wave Output at 100mv. The Parameter ""440&quo....
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Circuit Principle: Using LC oscillator frequency drift is more serious. SAW devices appear to solve this problem, the frequency stability of the crystal substantially the same,..
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The UBA2024 is a half-bridge IC and 550 V lamp controller. This device is equipped with 9 ohm switches that espouses standard CFL applications up to 15 W. The....
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A useful marker oscillator can be made using an NE555 to pulse the oscillator at an audio rate. This makes it easy to find the signal in the presence of interference. The crystal can be any suitable frequency from 1 to 30 MHz. ..
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Disinfection cabinet circuit principle is the use of infrared heating, in a closed cabinet to create a high-temperature environment, tableware disinfection. Circuit shown in FI..
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Now you can burn microcontrollers in your home with less cost of making AT89S51 series microcontroller burning IC kit. AT89Sxx series IC`s have inbuilt ISP (In System Programming) module so we can burning microcontroller easily. Here is the simple board....
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The circuit is a remotely operated DTMF telephone. The circuit can be used to change up to 9 devices using the keys 0 to 9 phone. Digit 0 is used to switch between the phone system remotely and change the way of normal conversation. IC KT3170 (DTMF to BCD....
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The use of positive feedback is useful for producing oscillators. The condition for positive feedback is that a portion of the output is combined in phase with the input. For an amplifer with positive feedback the gain is given by the expression below...
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Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher IC to simulate fire-alarm siren. Pressing button produces rapidly rising wail, with tone coasting down in frequency after button is released. Sound from loudspeaker resembles that of....
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This is an easy to build, but nevertheless very accurate and useful digital voltmeter. It has been designed as a panel meter and can be used in DC power supplies or anywhere else it is necessary to have an accurate indication of the voltage present. The....
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This is a design circuit for temperature relay that can be used to signal a fire or set point for temperature monitoring function. You need to adjust P1 so that T1?s base voltage is 0.5V smaller than the emitter voltage at a temperature a little bit....
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This is a color sensor Circuit Diagram. This circuit will sense 8 colors that are:, green, red and blue ; magenta, cyan and yellow ; and black and white. It`s will be very useful for robotics project. The object whose colour is required to be detected should....
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Touch controls are not only used to switch devices on or off. They can also be used to control different functions. One good example is the TV remote control. If it is very important to keep the activated functions for a long period of time, it is always....
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Various types of amplifiers like power amplifiers, audio amplifiers, tube and stereo amplifiers, sensor amplifiers, rf amplifiers, sound amplifiers, video amplifiers etc...
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I want to rotate stepper motor using jonson counter 4017 IC. I also using bipolar stepper motor. I connected pin 3 2 4 7 (sequence) of 4017ic with....
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Using an LM3915 VU meter LED bar graph driver?10 LEDs are driven?A simple audio amplifierdrives a detector circuit?which provides dc drive for the LM3915....
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Pulse width modulation or familiarly known as PWM is used to control the delivered power to load without loosing the efficiency. The speed of an electric motor....