Popular Circuits Page 141
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The wireless transmitter ambit congenital about transistor T1 (BF494) is a basal low-power variable-frequency VHF oscillator. A varicap diode ambit is included to change the abundance of the fm transmitter and to accommodate abundance accentuation by audio....
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As you can see in this FM IF MW radio receiver circuit schematic the LA1260 ic can be used in AM FM radio receiver electronic projects. LA1260 has integrated in the package many functions and features that are needed for radio receiver applications. high S/N....
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This voltage to frequency converter (VFC) circuit uses 555 IC and 741 op-amp as the main components. Up to 20kHz oscillation can be produced by this circuit..
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Designing a simple and yet functional Line Follower Robot (LFR) is always a fascinating and challenging subject to be learned, the LFR actually could be implemented in many ways start from a simple two transistors to a sophisticated PID (Proportional,....
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Circuit diagram schematics of Electronic Keys, Electronic Locks,Digital Electronic Locks,Transistor Code Locks,Combination Electronic Locks....
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This general purpose signal source serves very well in signal-tracing applications. The output level is variable to more than 1 Vrms into a 50 O load. Almost any crystal in the 1 to 15 MHz range can be used. Ql forms a Colpitis oscillator with the output....
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Simple random number generator using 8051 microcontroller. AT89S51 is the controller used here....
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Developed as interface between General Instruments AY-3-8500-1 TV game chip and antenna terminal of TV set. Adjust C1 to frequency of unused channel to which receiver is set for playing games. Article gives all circuits but covers construction only in....
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A durable car power inverter can give you a more convenient life. 100W car power inverter is the best choice for traveler when driving outside, or meeting an urgent need when power failure. AC adapter can be widely fit to all kinds of electrical devices....
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After reading the Mobile Robots Book, written by Joseph L. Jones and Anita M. Flynn, and get the Interactive-C file from ftp://cher.media.mit.edu, I found a very nice S19 downloader written by Randy Sargent. I started to download the pcode to my HC-11 board,....
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The information here is primarily intended for home brewers that want to build the analyzer or want to design their own based on the principles of the design. It is not intended for use in commercial applications ! If you want to build the analyser a warning....
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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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If you want to try a higher voltage with your pedals, try this simple and easy voltage doubler circuit which uses an ICL7660 CMOS Voltage Converter Chip I have found that JFETs such as the J201 sound much better at 18V than they do at 9V with more clean to....
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Circuit shown in Figure 3-12. It has a variable speed and timing control functions. When the switch S placed in the 1 position, press the button SB, the motor starts running, a..
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Coin detector and counter : How to detect different types of coins from their effect on an oscillating magnetic field....
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This VCO uses an LF356 op amp to produce a linear frequency vs. voltage characteristic using the CMOS HC4046. The frequency range can be changed by changing the capacitor connected between pins 6 and 7 of the HC4046. Using the HC4046`s internal transistor....
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STMicroelectronics introduces the STV0288 its TM latest DVB and DIRECTV QPSK digital receiver, which adds blind scan capability and DiSEqC 2. 0 to the industry-leading STV0299 and provides a cost reduction path or new products. By STMicroelectronics ..
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A bright lamp flashes in sychrony with the lightning bolts indicating the proximity and intensity of the storm....
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This scheme is an SWR meter, which is quite simple and easily built. Once you make a directional coupler, the results will be displayed with the measure led meters as a ratio SWR...
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Together with a good directional antenna this high performance two-stage antenna amplifier for the VHF FM broadcast band will enable you to capture far rem...
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Varying Brightness AC Lamp Circuit, an SCR is used to slowly vary the intensity of a 120 volt light bulb by controlling the time that the AC line voltage is applied to the lamp during each half cycle. The circuit is directly connected to the AC power line....
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Power-saving electronic mousetrap This example describes the usual minimal power consumption, only when the mouse enters the control zone when..
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This is the latest BH1417 FM Transmitter design from RHOM that includes a lot of features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, stereo encoder for stereo transmission, low pass....
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This design measures the differential temperature between two sensors. Sensor Tl, located before the heater resistor, assumes the fluid"s temperature before it is heated by the resistor. Sensor TZ picks up the temperature rise induced into the fluid by the....
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The following circuit diagram is a simplified application circuit of the TDA8932B/33(B) device when operated from an asymmetrical supply (single supply). Here`s the circuit diagram: To simplify the design for an asymmetrical supply in SE configuration, the....
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This power supply is based on the LM317 Variable Regulator. The input of the regulator needs to be around 28 Volts DC and it will output a DC voltage from 1.25vdc to 25 vdc. To adjust the output voltage simply turn the 5k ohm pot. The regulator will supply....
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The dual outputs of the LTC6103 can be used individually to provide overload detection, and/or may be taken as a differential pair to provide a bidirectional signal to an analog-to-digital converter (ADC) for example. Figure 3 shows a typical circuit for a....
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This page covers several different regenerative receiver circuits that were used in the past, mostly from 1920s to 1940s. Connections are shown with electron tubes (vacuum tubes/valves), but FET transistors can be substituted with little or no changes. To....
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As shown in FIG bathroom light switch gated automatic way, when someone enters, once the door is opened, the light switch is turned on bright lights. When the out door is opene..
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The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
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This circuit draws very little power, less than 5 mA with a single 6-V power supply. making it ideal for portable battery-operated equipment. The small size and low power consumption belie the 90-dB dynamic range and 10.5-I"V sensitivity. De output voltage....
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An LM556 dual oscillator/timer, U1, configured as a two-tone oscillator drives U2, a dual4-watt amplifier. One of the oscillators, pins 1 to 6, contained in U1 produces the upper frequency signal of about 200 Hz, while the second oscillator, pins 8 to 13,....
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DK-5A, 5D, SDb control box, all with a thermal electromagnetic overcurrent release, the circuit shown in Figure 6-80. Trip has overload and short circuit instantaneous action l..
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This circuit enables any infrared (IR) remote control to control the outputs of a 4017 decade counter. It`s quite simple really and uses a 3-terminal IR receiver (IRD1) to pick up infrared signals from the transmitter. IRD1`s output is then coupled to NPN....
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The ATmega8 microcontroller-based Low-Cost Telemetry Device (LTD) is an efficient telemetry keyer. The LTD measures the voltage levels of up to four analog channels via its on-chip 10-bit ADC, converts the measurements to numbers, and then sends the data in....
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This circuit will automatically switch on several mains-powered "slave" loads when a "master" load is turned on. For example, it will switch on the amplifier and CD player in a stereo system when the receiver is turned on. It works by sensing the current....
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Controlling room lighting using computer. I bought some triacs and opto couplers to do this. I drew the schematic and built a prototype. Everything worked well. We cannot see it on the pictures, but there is a cable going out of the box that plugs in the PC....
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Stepper motors are useful in many consumer, industrial, and military applications. Some, such as personal-transportation systems, require precise speed control. Stepper-motor controllers can be simple (Figure 1), but they require a variable-frequency square....
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circuit diagram of audio distortion meter has been described here. Audio distortion meter is used to measure Total Harmonic Distortion...
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This simple circuit protects an SLA battery from over-discharge by disconnecting the load when the terminal voltage drops below a preset level. In operation, a sample of the battery voltage is derived from the 22k © resistor and 20k © trimpot divider. This....
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Using the FAN7710 Ballast Control IC for Compact Fluorescent Lamps developed using Fairchild`s unique highvoltage process and system-in-package (SiP) concept can be designed a very simple low cost fluorescent lamp driver electronic project. The FAN7710....
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First section of free-running 7413 Schmitt-trigger oscillator runs at one-third of desired TV-channel carrier frequency (about 20 MHz for channel3) and drives buffer section whose output is square wave at oscillator fundamental. Q1 modulates RF output by....
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This inverter uses no special components such as the torodial transformer used in many inverters. Cost is kept low with the use of cheap, readily available components. Essentially, it is a power amplifier driven by an asta-ble multivibrator. The frequency is....
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Stepper motor gives a simple, low cost, and accurate position control. Stepper motor can be driven by circuit mounted close to the motor, and controlled by a...
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This RF Wave Absorbion meter will detect signals between 10cms and 10m away all acording to the setting of the 22MegOhm gain adjustment potentialometer and the power of the transmitter. The RF signal is detected across the germamium OA91 doides and rectified....
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70/40 Watts Hi-Fi amplifier is most advanced, and best Hi-Fi amplifier having almost 0% distortion circuit diagram and description of hi-fi amplifier.hi-fi amplifier...
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Don`t like your little brother`s TV channel selection? Hate the volume your wife sets the stereo at? Want to just annoy someone? This circuit does all that and more by jamming most IR remote signals. The circuit releases a flood of pulsing IR light that....
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Most of the inverters in the market uses modified sinewave for better output at competitive cost. The modified sinewave unit uses a 50% fixed PWM squarewave and the hikes are balanced by a capacitor to produce almost a sine wave. This is called quasi....
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Designed around the popular ZN414 ic this receiver covers the AM band from 550 - 1600 KHz with the values shown. For Longwave the coil needs to be changed. Use one from an old MW radio to save time. The ZN414 is a tuned radio frequency designed and....
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Charge redistribution to achieve A/D conversion. In typical applications, as a ratiometric conversion system for a microprocessor, V^p, will be connected to ground and VREF+ will be connected to Vcc.
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By the regulator and the regulator circuit silicon resistor formed Simple voltage regulator circuit is mainly..
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You may need a different wiper motor in some cases, rebuilt units are typically available at the parts store for a reasonable cost. Once you have the parts and the manuals, it should be a simple matter of installing the right switch, motor, and (if needed)....
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Capacitor C1 is charged through timing resistor R1 when the clock output is high. When C1 reaches the upper threshold voltage, the output signal decreases, and then C1 discharges through R1 until its voltage reaches the lower threshold point. When this....
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At this circuit the SSM2044 IC is used, a 4 pole voltage controlled filter designed for electronic music applications. On-chip voltage control of resonance allows direct and easy interfacing with programmers and controllers. The IC features extended control....
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Do you know how infrared motion detector alarm Whenever someone comes in the infra-red zone. Infrared motion sensor, which detects moving human body. The alarm will sound automatically. The detection zone coverage is 80 degrees horizontally to 8 meters....
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This light dimmer is used to dim the intensity of 12V light bulbs using the well-known 555 timer that is configured as an astable multivibrator. The pulses....
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This guitar effect circuit uses a simple high gain amplification, followed by a symmetric clipping using parallel diodes clipper. The gain of the 741 op-amp....
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Note that there is very little in the way of protection circuitry and fuses in this amplifier. There is a short turn-on delay for the output power supply to minimise thumps, and a couple of line fuses, but no other protection. This is not recommended for....
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In the circuit, 60 individual LEDs are used to indicate the minutes of a clock and 12 LEDs indicate hours. The power supply and time base circuitry is the same as described in the 28 LED clock circuit above. The minutes section of the clock is comprised of....
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The amplifier's gain is nominally 20 dB. Its frequency response is determined primarily by the value of just a few components—primarily Cl and Rl. The values of the schematic diagram provide a response of ±3.0 dB from about 120 Hz to better than 20,000....
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This low cost bass treble circuit consists of some capacitors, resistors, and two T/C pot for BASS and TREBLE control. this circuit can be made without even a veroboard. You just solder components as this circuit network is not so complex. It has only....
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A Simple Transistor Based Motorcycle Alarm Circuit This is a simple - easy to build - transistor based motorcycle alarm. It`s designed to work at 12-volts. But - if you change the relay for one with a 6-volt coil - it`ll protect....
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This circuit allows an SPST momentary pushbutton to act as a push-on push-off switch, using a DPDT latching (bi-stable) relay. It was originally intended to allow a single pushbutton switch on the dash of a vintage car to provide a latched function. The....
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I would like to learn if this circuit will invert the input signal or not. The opamp is single supplied, and supply voltage is 5V. The input signal is varying between 0V and 5V. What happens the the output voltage if the signal is inverted I think, if you....
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A 2003 Monte CarloSS, I am having trouble with low idling, it cuts off while driving or when in park. It also has no dash lights and no one can seem to understand why, one day they worked and then they didn`t occasionally will come on for a second or two....
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The composite lowpass filter uses interior constant-k full sections terminated by m-derived half-sections.The design technique is also applicable to highpass and wideband filters (references 3 and 4). Figure 1 shows a schematic of the composite lowpass....
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This is a design for a door alarm circuit, but in this design using electronic system. This circuit uses a synthesized sound chip from Holtek, the HT-2811. This circuit reproduces the sound of a "ding-dong" chiming doorbell. Additionally, the circuit....
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After dismantling chinese copy of segway I wanted to check how the controller is made. After a couple of hours of work with multimeter, pen, a sheet of paper and Kicad I came up with a block diagram and schematic of motor controller. This motor controller is....
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In Figure 7-2 is the FSK signal demodulation circuit composed of the digital phase-lock. The circuit consists of 2 oscillators with different frequencies, i.e crystal oscillators X (the frequency is 983.04KHz) and X2 (the frequency is 1.2288MHz) compose the....
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A simple musical light chaser circuit diagram and schematic using IC CD4016. This simple circuit blinks light according to sound/audio/music output and as a result 10 lights dance according to sound frequency....
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The notion of "crystal radio" is strongly associated with huge antennas and radio broadcasting on long and medium bands, in this article, the author describes the experimentally tested detector circuits of VHF receivers designed to listening to a FM....
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A similar circuit can be used with an 8 ohm speaker but in that case you would put it in place of the emitter resistor. This circuit works as a carbon microphone replacement...
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Sometimes, you may keep a part of application code in the Flash/EPROM version of the 8031 and remaining part in an EPROM (in an expanded system). Time has come to introduce another useful tool, 8051 Programmer. This Programmer supports the devices in the....
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As shown in FIG controllable integrating circuit. The circuit has reset to zero, and to keep different integration time constant controllable integrator. The analog switch is C..
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This simple circuit can monitor the charging process in 12 Volt Lead Acid battery or Tubular battery. The status of LED indicates whether the battery is accepting charge or not. It also indicates the full charge condition. The circuit can be incorporated in....
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The build makes use of a 10 x 20 grid of RGB LEDs controlled by the myRIO. It`s played by using a web interface on any device, as long as you have WebSockets support. [Sam] had originally built it using an Arduino at the heart, but wanted a stand-alone....
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The PIC18F4550 chip contains more features than the PIC16F including a module for USB communications. There is some added complexity. The first issue to resolve is which chip to order. The PICSTART Plus will program the 40 pin PIC18F4550-I/P chip. The....
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The following diagram is the schematic diagram fo Car Horn, you may try this circuit for your car modification Components List: R1 = 68K R2 = 2K2 R3 = 56K R4 = 3K3 R5,R6 = 4K7 R7 = 10K Pot/trimpot C1,C2 = 22nF C3,C5 = 100nF C4 = 1nF C6 = 22....
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Rear channel "ambience" can be added to an existing stereo system to extract a difference signal (R - L or L - R) which, when combined with some direct signal (R or L), adds fullness, or "concert hall realism" to the reproduction of recorded music. Very....
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This circuit provides 20 ±0.1 dB voltage gain from 0. 5 to 25 MHz and ± 3 dB from 70 kHz to 55 MHz. An LM733 video amplifier furnishes a low input-noise spec, 10-I"V typical, measured over a 15.7-MHz bandwidth. ..
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Design, the front panel buttons to set the 10 number keys and the keys 0-9, move the key, down health, Enter, i recover key, door key j count 16 keys. Ding also features in the..
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The chart shows the Wien bridge sine wave oscillator circuit. The amount of negative feedback circuit is determined by the internal resistance of FET. When the peak value of oscillator output reaches the regulated voltage of regulator diode D1, Q2 turns on,....
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A "video-digitiser" (also known as a "frame grabber") captures pictures from a TV set, camera, or video recorder, etc. , and forwards them to a computer for display, storage, or general manipulation. This document describes a home-built digitiser which....
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Controlling heaters rated as high as 1500 watt requires stringent specifications with the controlling unit for safe and effective implementation of the intended operations. With the advent of advanced snubber-less Triacs and Diacs makingheatercontrollers at....
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Since I finished my degree in April, I have been looking for work. The search has been slow but hopefully soon I will be making the big bucks. To fill my s....