Popular Circuits Page 58
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As a wideband PLL FM Demodulator the UTC L2572 is intended for application in satellite Tuners primarily. The device includes all the necessary elements, with external Oscillator sustaining network and the exception of loop feedback components, to form a PLL....
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This simple circuit uses a 741 op-amp in differential mode as a continuity tester. The voltage difference between the non-inverting and inverting inputs is amplified by the full open loop gain of the op-amp. Ignore the 470k and the 10k control for the....
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The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don`t build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this....
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The circuit of the running light comprises two integrated circuits (ICs), a resistor, a capacitor and seven light-emitting diodes (LEDs), Decade scaler IC....
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The circuit is not particularly susceptible to motor transients and supports FULL STEPS FORWARD, FULL STEPS REVERSE, ACTIVE HOLD, and POWER OFF aka RELEASED. If the motor does not turn then swap around the leads of ONE of the two coils. To reverse the sense....
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The shown LEDs in the circuit sequentially light and "dance" as per the level of the music applied at the input, preferable directly from the speaker terminals of the audio gadgetwhosemusic level is to be monitored. The above stage is identical to all the....
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Video switch is required to mux/multiplex several video sources, enable multiple camera to be displayed subsequently on a single monitor. This multiplexing....
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This circuit is based around the PIC16LF1937 microcontroller. This chip is actually a small computer contained in a single chip, including RAM memory, EEPROM, I/O ports, CPU and so on. When you buy this chip, it comes empty with no program on it. You have to....
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This easy circuit provides good gain to weak audio signals such as electret microphone. Use it in front of an RF oscillator to make an RF transmitter that`s very sensitive to sound. Here the simple audio mic pre amplifier circuit based on single IC LM358.....
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MC44BS374CA: PLL Tuned UHF and VHF Audio Video High Integration Modulator MC44BS374CA The MC44BS374CA Audio and Video Modulator is for use in VCRs, set-top boxes, and similar devices. By Freescale Semiconductor, Inc ..
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The MIDI Drum Machine began in the Fall of 1991 as a project for a microprocessor system design course, shortly after I wrote PAULMON1, the 8051 monitor/debugger. A friend, Rod Seely, both a musician and electronics hobbiest suggested I design something....
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The circuit in Fig. 1 uses a single bicolor LED to
indicate both power-on and blown-fuse conditions.
Regardless of the condition of the fuse, the green
side of the LED is always on for each positive
half-cycle of the ac input. With a 120Vrms ac
input....
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Hi i am ajinkya this is my first Instructable -SIMPLE WATER DETECTOR For this project u will need the following parts: 1.IC 555 timer-1 2.Small size g....
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With the technical development, appearance and employing extensively of the large high-accuracy dynamic range D/ A converter at full speed of digital signal processing, because of sampling technique and computing technique, generated frequency is relatively....
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Hi everyone! I found this circuit in my computer (i don`t remember where i got it and when) and i was wandering if it`s able to dim 220V LED BULBS? it ....
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The following circuit shows about 35W quadruple amplifier and 2 x 25W bridge amplifier based on the TDA7375 IC, this circuit requests the minimum of external components. Although the first conception went to car applications, to give him/it in a great....
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The schematic diagram come from circuit: 12V DC Voltage Doubler Circuit power supply. Go to that page to read the explanation about above power supply related circuit diagram. This is the circuit diagram of DC voltage doubler / DC converter. The circuit will....
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The figure shows the schematic for a versatile logic probe. The zener diode clamps the input signal just above the TTL inverter`s 2.2-V trigger voltage. Zener diode D1 can be left out if the probe is going to be used only on TTL circuits. The logic probe is....
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Circuit The picture shows the circuit diagram of a rotation sensor that can turn on a device like motor or buzzer while the circuit assembly rotates. The circuit is based on basic 555 timer operation. ..
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For this radio, which I repaired for someone, I made this DIY VL1. Later I found the real tube...
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A long time reading, writing, the distance between the eyes and the book too close, the light is too dark, etc. are the main cause of decreased vision. This example describes t..
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This application involves demodulation of a frequency-modulated subcarrier of the main channel. This popular example uses the PLL to recover the SCA (Subsidiary Carrier Authorization or storecast music) signal from the combined signal of many commercial FM....
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It is one of the most popular type of oscillators used in audio and sub-audio frequency ranges (20 20 kHz). This type of oscillator is simple in design, compact in size, and remarkably stable in its frequency output. Furthermore, its output is relatively....
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Afterwards the Modular preamplifier presentation good is I present also a simpler circuit in the manufacture but very good quality. And in this circuit the philosophy that follow is: simple is also better. As you will see in the circuit, it was used only....
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Analysis of simple digital circuits means to determine how the circuit behaves, which is represented for its truth table. So, with this aim in mind, lets organise the analysis step by step (as explained in Unit 1. 3 ) : For instance, here you are the circuit....
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A beautiful diy gsm jammer or mobile cell phone jammer schematic diagram for use only in GSM1900 with frequency from 1930 MHz to 1990 MHz. The GSM1900 mobi....
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Bike Engine transplant Central, a site devoted to the use of high powered bike engines in lightweight kitcars. Bike Engine transplant Central...
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Here s a design circuit for linear opto coupler circuit that is based on MOC5010 and can be used to isolate a circuit from main grid, audio interface, in medical electronics and many other applications. Here s th ....
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An analog signal requires about 100 ns to propagate through the HA-5320. For time-varying signals, this assures a voltage dif..
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Control a LED with audio signal, but the problem is, that output signal is only 150mVpp (with 150mVpp positive offset). In my understanding, it needs to be higher than 0. 6V to get the transistor running, therefore I am not sure what to use instead. Do I....
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This is a standard digital clock circuit,frequency size 1 Hz or 2 Hz. It can be used in the normal clock circuit. It consists of IC-4060 and IC-4013, the....
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When using a regulated power supply to reduce a supply voltage, there is always the danger that component failure in the power supply might lead to a severe overvoltage condition across the load. To cope with overvoltage situations, the circuit is designed....
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See (a) for the timing information for the alarm circuit in (b). When leaving your vehicle, flip the arming switch and close the door to arm the device. Subsequent opening of an entrance triggers both timers. After the expiration of the entry delay timer,....
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Basically I used the parts list that is on the first page of the Make Magazine article. But that list is for the harp which has 6 lasers so most quantites can be just 1. ..
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The amplifier feeds a brace of speakers with two LM3876 amplifier chip circuits (50 watts per channel), or a brace of headphones Meier Crossfeed through a clarify and a bifold OPA2134 Opamp. There are four selectable band inputs, and achievement buffers with....
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The Flash MC Experimenting Board I is an ideal platform for all developements in conjunction with the Atmel Flash microcontrollers AT89C1051, AT89C2051 and AT89C4051. It is not only recommendable for starters but also very much recommendable for the advanced....
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This circuit uses an LM11 to form a voltage follower with 1G ohm input resistance built using standard resistor values. With the input disconnected, the input offset voltage is multiplied by the same factor as R2; but the added error is small because the....
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To obtain the power supply graphs on the previous page, I didn`t stand outside for two days straight measuring the power sources with a voltmeter. Instead, the circuit itself is able to independently monitor the power sources with the addition of a few....
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This RF probe can be used at High Frequency (HF) or Ultra High Frequency (UHF) on both 50 and 75 ohm coaxial cables. In addition the RF voltage can be measured under load or no-load conditions which allows the circuit to double as an RF Watt meter. The RF....
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A differential amp used by the SIM, and it is a completely conventional circuit. This is adjustable by using VR1 to null out any normal variations that the amp might show when there is no distortion or other nastiness in evidence. The second stage is a....
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Pulse width modulation (PWM) is a technique to control analog circuits with a digital output. PWM is used in many applications, Specially to control light intensity and speed on motors. A PWM circuit makes a square wave with a variable width. The pulse width....
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Infrared emissions detected by Ql are fed through Ula to Ulb, which amplifies the signal by a factor of 100. The amplified output ofUlb is fed to Ulc through R9, C2, and R6. Potentiometer R9 serves as a volume control. With R9 set to pass the maximum....
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The circuit below consists of two twin-T oscillators set to a point below oscillation. To set the circuit into oscillation, we can touch the Touch Pad. Here is the schematic diagram of the circuit: By touching the pads in different ways and a whole range....
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To maintain content in the event of power loss, many designs that include SRAM require a dedicated device that can automatically switch from a standard power supply to battery operation. Microcontrollers seldom find use in power-switching applications.....
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As you can see from the article LPT port expander, this PPI-8255 is a general purpose I/O programmable function. But usually this IC are tired to the computer bus directly. Return to this idea, here I will show you that the card can be used to dual function....
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A Theremin circuit shown in the schematic diagram below use different method to control the pitch. The oscillator of this tone generator, both the volume and frequency are controlled using LDRs, a light sensitive electronic component, so we can call this....
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As shown for the simple differential amplifier circuit. Two input signals Vi1 and Vi2 respectively by R1 and R3, R4 voltage divider circuit added to the op amp input. Vi1 appli..
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Hall-effect switches have several advantages over mechanically and optically coupled switches...
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This electronic project is a simple microphone preamplifier based on the LM318 op amp. The LM318 op amp is operated as a standard non-inverting amplifier. Resistor R1 provides an input path to ground for the bias current of the non-inverting input. The....
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Right here is definitely an simple VE7GC Popcorn RF preamplifier by Dick Pattinson. The circuit utilizes a single tuned circuit at the front end and can connect straight to a mixer or product detector in a simple receiver project. Note how Dick provided....
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Wine doesn`t like subzero temperatures, and during wintertime, my "winecellar" got pretty cold. There was an electric heating element, but the thermostat was broken, so it was either full burn or nothing. That`s how the temperature monitor/controller came to....
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The accuracy of direct linear coupling of analog current signals via an optocoupler is determined by the coupler linearity and its temperature coefficient. Use of an additional coupler for feedback can provide linearity only if the two couplers are perfectly....
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A used USAT F3A found it`s way into my possession today. I wasn`t planning on this, it just sort of happened. However, now I have another loco for the GIRR. The road number of the model is 26C. By the ATSF numbering scheme used at the time, this would be the....
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If you would like to automate? the opening and closing a rolling shutter with a time controlled switch, a few additional wires will have to be ...
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I built this headphone amplifier for dynamic headphones based on my rules of proper audio design. People who know my designs will realize that this amplifer is much more than just a headphone amp. It is a pure class A design containing a new....
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A commercial diode is the detector in this highly accurate radiation monitor. The lowdrift FET-input op amp amplifies detector current to a usable level, and the chopper-stabilized amplifier then provides additional gain while minimizing any error caused by....
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The goal is to freeze different stages of some fairly quick process (at least when compared to the time resulotion of the human eye). Since I don`t have fancy toys like a high speed film camera, lack of good equipment has to be compensated with a smart setup....
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This circuit mimics the dual-tone drone sound that"s produced by the unusual wind instrument. Urnjunction transistors Ql and Q2 are connected in similar audio-oscillator circuits. Each of the oscillator frequencies is determined by one of the two resistors....
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This voice changer circuit diagram electronic project is designed using the RTS0072B single chip CMOS LSI designed for voice changer applications, which can transpose or distort one voice into another voice by encoding the input audio signals in normal speed....
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The conception of this project is directed to the study of the environment response due to a human action. Based on that subject, an environment was prepared with several visible rays of laser. If one of theses rays is interrupt (eg. someone crosses it), an....
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This diagram shows a high speed data acquisition system with 8 differential inputs and 12-bit resolution using the AM-543. If the control logic is timed so that the Sample-Hold-ADC section is converting one analog value while the mux-amplifier section is....
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This circuit has a Schmitt trigger and integrator built around one op amp. Timing is controlled by the RC network. Voltage at the inverting input follows the RC charging exponential within the upper and lower hysteresis levels. By closing the switch SWI, the....
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A wide range frequency meter is an useful tool for an electronics lab. This projects describes a frequency meter based on AT90S231 microcontroller that can measure input frequencies up to 50 MHz. The measured frequency is displayed on 6 digit multiplexed....
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If your letterbox is some distance from your house, you will find a monitoring device useful to indicate when new post has arrived. This can take the form of a US-style visible flag; a more modern alternative uses a 433 MHz radio transceiver. The big....
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An Internet connection would be a valuable addition to many projects, but often designers are put off by the complexities involved. The NetWorker`, which consists of a small printed circuit board, a free software library and a ready-to-use....
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The AS3636 is a highly integrated Photoflash charger including IGBT driver, inductive DCDC boost autofocus/ video LED driver, an indicator LED driver and it includes system level ESD protection and a ....
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Typical current = 0. 7Amps with no user I/O connected. More current may be required dependent on the amount of Digital I/O and Analog +/- 15V consumed by the user. Up to 2 watts of +/-15 volts is generated on board from this 5V supply (most of which is....
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LED's are great display tools. Their prices have decreased to a point where they are replacing more conventional light sources. In one sense their characteristic need for low voltages is an advantage e.g compatibility with I.C drives, but this voltage....
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As shown in FIG grounds ISO100 multichannel data acquisition system consisting of a programmable gain amplifier isolation by optocoupler, programmable amplifier PGA100 and isol..
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This type of travel may be possible if two space points can be connected by a vortex channel in aether. The channel allows continuity of matter, energy, life etc by establishing a connection between two distant points. The vortex channel can be created by a....
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This is a universal remote control I built. The entire thing was programmed with just 1KBof memory, and works with TV`s using the RC 5, RC 80, and NEC protocols (most TV`s). Its effective range is about 40m, and is effective at angles up to 60 degrees. I....
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After all job of building the prototype and making the sketch work, it`s the time to build the circuit. It`s not the objective to explain in detail how to make printed circuit boards, but only a superficial explanation about it, besides, of course, to....
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Four appearance drive signals for two appearance bipolar and four appearance unipolar footfall motors in microcomputer-controlled appliance is calmly implemented application L29 Stepper Motor Controller IC. We can drive the motor in bisected step, accustomed....
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This is a functionally complete, four-quadrant, analog multiplier. Four quadrant means that both operands that are multiplied can take any polarity i. e. +/- and hence multiplication can happen across 4 quadrants. It includes high impedance, differential X....
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The circuit is composed of lag comparator with A1 and inverting integrator A2, and the charging and discharging time constant is decided by integral resistors (R1+RP1) and the capacitor C1. VD1~VD5 form the limiter circuit. The maximum oscillation frequency....
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A bridge rectifier and 12-volt regulator powers the MOSFET sensing circuit. The unregulated output of the bridge rectifier operates the drain solenoid via switch SI. The sensor itself is built from two electrodes, one made of copper, the other of lead. In....
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The PWM controller uses complementary half-H peripheral drivers SN75603 and SN75604, with totem-pole outputs rated at 40 V and 2.0 A. These drivers effectively place the motor in a full-bridge configuration, which has the ability to provide bidirectional....
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Circuit can be used to control low power DC motor, series motor or shunt motor speed and direction. Motor and rectifier bridge G1 series, and then connected to the grid transfo..
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This page describes how to reflow solder surface mount printed circuits using a cheap toaster oven. It owes a great deal to Nophead`s Cooking with Hydraraptor blog post. The picture shows Sally Bowyer (Director, RepRapPro Ltd ) preparing components for....
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A model RTX-70 exciter that was originally used in the Brookdale ATV Repeater System. This page describes some the design considerations and new features possible with this new exciter, and includes schematics of the circuits designed during the exciter`s....
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The following circuit shows about Automatic Loudness Control Circuit Schematic. This circuit based on the TL072 IC. Features: different ....
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As shown in FIG constituted by 880MHz RF2347 low noise amplifier application circuit. Radio frequency (RF) signal from the input pin 3, after the output of the amplifier 7 feet..
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Play this game alone or with your friends. The circuit comprises a timer IC, two decade counters and a display driver along with a 7-segment display. The game is simple. As stated above, it is a scoring game and the competitor who scores 100 points rapidly....
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This is a square wave oscillator (digital, like 8-bit music). It`s based around the LM386 amplifier I. C. , which is what the mini guitar amplifier was based on. It has a simple power switch connected to the battery, a potentiometer for adjusting the tone,....