Popular Circuits Page 264
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ESP - The Audio Pages. Amplifier design techniques, find out how amplifiers work, and how to design them....
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This circuit was submitted by Graham Maynard from Newtownabbey, Northern Ireland. It has an exceptionally fast high frequency response, as demonstrated by applying an 100kHz squarewave to the input. All graphs were produced using Tina Pro...
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By testing many different circuits, I ended up with the simplest ( in terms of parts count and straight signal flow) design, similar to those " Heathkits", with one tone control and FET buffer. From modern features - only True By-Pass switching, DC jack and....
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This is a circuit of board system monitoring for temperature and voltage condition. It uses the NE1617A. The NE1617A is a 2 channel temperature sensor. It can...
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I just finished a half duplex serial asynchronous link from a simple PIC circuit to the RCX. It is able to receive codes from the RCX (or Lego RCX remote control) store them in RAM & EEPROM and transmit any IR op-code to the RCX in turn. Included in the....
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The system utilizes the H21A1 and a chopper disc to provide superior speed regulation when the dynamic characteristics of the motor system and the feedback system are matched to provide stability. The tachometer feedback system illustrated was designed....
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Most of the CDROMS available have an Audio-Out Output to either plug in the headphones or connect it to an amplifier. This circuit enables one to use the CDROM as a stand alone Audio CD player without the computer. This circuit is nothing but a power supply....
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wireless FM transmitter or often called fm transmitter uses 2 transistors in this article uses 2 transistors 2n2222. If the fm transmitter is in use voltage supply of 9 volt battery and use an..
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A laser module designer can use a fixed resistor, mechanical pot, digital pot, or a digital-to-analog converter (DAC) to control the laser driver`s modulation and bias currents. The advantages of a programmable method (POT or DAC) are that the manufacturing....
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Figure 1-91 is added loudness volume control circuit practical circuit. It plugs into the preamp and tone control circuit of the room, behind the OCL and other can be connected to the main amplifier. Practical effect proved effective. In volume was very hour,..
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The schematic below showsTLE5206-2 5A H-Bridge for DC Motors Circuit Application. It such a device which has an integrated power H-bridge with DMOS output stages for driving DC-Motors, according to the datasheet. TLE5206-2 Circuit Application describes Input....
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This is a light dimmer circuit. It has no fancy special feature, it is a a quite typical TRIAC based dimmer circuit. This circuit is only used to operate with....
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This circuit may be used where a high current is required with a low ripple voltage (such as in a high powered class AB amplifier when high quality reproduction is necessary), Ql, Q2, and R2 may be regarded as a power darlington transistor. ZDl and Rl....
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The game Tetris using a PIC16F84 running @ 12MHz. Tetris is an old Russian computer game where you should try to fit in block into a play-field, quite simple but really fun. In my version, the video signal is generated in softw1are. The only hardware used....
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The circuit consists of K-type thermocouple cold junction compensation circuit, precision 5. OOOV reference voltage source and OP113 composition, can o-lOooqc to measure the temperature, the temperature resolution of 0.02cC. OP113 wide range of precision..
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Circuit This circuit was designed to assist the installation of TV antennas. The signal is monitored using a small portable TV set and this circuit monitors the output of the TV`s FM detector IC via a shielded lead. To initially calibrate the meter, adjust....
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This circuit is another radio frequency (rf) field strength meter, similar with our previous field strength meter circuit, but with lower supply voltage (only a single cell 1. 5V battery). Here is the schematic diagram of this rf strength meter circuit: To....
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You can use 12 V car battery as the 12V input power source. Adjust the potensiometer R1 to get the 50Hz output frequency. Use a 10 A fuse in series with the battery as shown in circuit...
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This circuit is composed of a temperature sensor, amplifier, V/F converter, three digit binary coded decimal (BCD) counter, time base and seven segment led displays. In addition to the 9400 V/F converter, other ICs need for this project include the LM334....
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The gas furnace is the simplest to operate and understand. Therefore, we will use it here to look at a typicalheating system. This type of natural-gas furnace is used to heat millions of homes in the United States. Note the location of theblower switch and....
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Full short-circuit and overcurrent protection is given by this circuit suitable for workbench applications in technical schools and laboratories where there is a need to work directly with the mains. Additional features are a clearly visible red lamp....
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City dwellers and other flat dwellers know the practical difficulties they encounter when they try to put up an antenna for 40 meters. Finding space enough to accommodate 67 feet of wire is a real problem for them and most of them have to be satisfied by the....
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I ride my bike allot at night and sometimes I'm not sure if people can see me. This circuit will flash an incandescent light that you can purchase from Radio Shack. Adjust the VR's for your flash requirements and make sure that the lamp you use is designed....
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Do you long for a beach holiday on a tropical island, but you don t have the necessary wherewithal? We ve got just the answer: build the i-TRIXX surf simulator, put on your headphones, and dream yourself away from this dreary realm. Let the rhythmic rush of....
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This is a Sine Wave Oscillator circuit. This circuit as known as amplitude-stabilized sine-wave oscillator. It can gives high purity sine-wave output down to....
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AX3-300-2 DC arc welding machine circuit Rotary DC arc welding machine has AX, AX1, AX3 and AR series. Its structure is basically the same, are made of a three integral unit co..
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TDA 2030 audio amplifier can output 20 W but in this schematic we have reduced the power to 8w and we use 10w speakers. The input sensivity is around 200mV and the amplifier is set by the 47k and 1.5k resistors. TDA2030 amplifier circuit di....
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This circuit is fed from the earphone jack of your receiver and goes to limiter control R6 and is then amplified by Ql: a common-emitter stage that has a voltage gain of only about 10, because of the negative feedback introduced by R3. The output of Ql is....
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This is a gadget that will estimate the amount of water left in the water tank of a caravan or camping unit....
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This following circuit shows a voltage doubler using NE555 timer. This is a simple project. The NE555 IC is wired as an astable mutivibrator ....
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Lithium Polymer Batteries are a very common source of power today. Many electronics gadgets have one inside, and they have some reasonable features. I've bought great batteries, with different sizes and capacities for my electronics projects. So long I'm....
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Timing capacitor (C1) produces several times constants which is used to allow large voltage swings on the input due to the LM101`s large input voltage range. The R2 should be reduced and the C1 should be increased to keep from exceeding these ratings. The....
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A dc-dc converter using a 74HC04 drives Tl. Tl is a ferrite-core transformer using a Fair-Rite, Inc. P/N 597..
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The potentiometer portion of a mixed-signal, digitally programmable potentiometer adds variability to an analog circuit, and its digital controls provide programmability. You can use a digital potentiometer in two ways in an analog circuit. You can use it as....
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The talking Yoda head consists of a Yoda mask and a microcontroller system to achieve the desired operation/effect. The basic operation of the project was specified as follows: The head was to be placed inside a closed box. Upon opening the box, the light....
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It shows the use of various forms of pulse signal generating circuit operational amplifier...
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We discussed creating a 6` tall alarm clock - authentic down to the Timex face plate. While this may sound like a silly idea to begin with, it quickly became obvious just how difficult it would be to build at that scale so the project was scuttled. Recently,....
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When the power supply circuit, if taken as 15V, 10W power load available on. The main difference..
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Multiplexed 7-Segment Display PCB The display PCB consists of four MAN72 7-segment common-anode ....
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A 1990 Toyota Camry LE station wagon & trying to install a replacement power antenna. I have removed the OEM antenna (no easy task), but now trying to figure out how my replacement model that only has 2 wires (red & green) is suppose to connect with my....
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Magnets with a very long coil wound around transform the vibrations of strings into an electric signal. (We are talking about "magnetic" pickups, not "piezo" pickups. ) In 1 Volume/2 Tone or 1 Volume/1 Tone types, the pickups` hot wires go to the selector....
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The electronic bell needs no power supply. Most of the resistors are not critical, although C2, R2, and R3 work best at the values given. Leaving out Rl will make the unit ring louder. The piezo buzzer may vary from store to store. If it has two leads,....
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It is possible to add bus masters to the system, but a different bus architecture would be required, since the Integrator/CP uses the AHB-Lite bus protocol, which allows only one bus master (the ARM CPU core). One way to add bus masters in a Logic Tile would....
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This is a very easy instructable to build a digital switch for your camera in order to take photos with your microcontrollers. What you need: 1....
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The Spartan-3an board has external 5v Relay interfacing, indicated as in Figure. ULN2803 is used as a driver for FPGA I/O lines, drivers output connected to relay modules. PTB connector provided for external power supply if needed...
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Colour is often used as shown in audio circuit (TDA1521), the circuit is taken from Changhong C2191, the OTL two-channel connection. TDA1521 pin functions and reference voltage..
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In this tutorial you will build a wailing siren that plays a tone that increases and decreases in pitch. The circuit uses two 555 ICs and a loudspeaker....
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The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the anti-theft detection circuit, the control circuit, the sound generator, the audio oscillator and the power amplifier output circuit, the circuit is as shown in figure....
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With the easy availability of inexpensive digital multimeters, and integrated circuit temperature sensors, it is now very easy to build a sensitive and accurate digital thermometer that can be used for many experiments around the house or in the amateur....
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FIG. 2A3A low direct thermal resistance transistor, its resistance is only 800, so the output transformer primary screen to screen to load impedance 3.5k Cong. Push-pull amplif..
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The IR Jammer is a fun project that provides a bit of safe, non-destructive fun. The Infrared Remote Control Jammer allows you to render all IR remote controls inoperative! The microcontroller in this design allows for all 6 of the main IR frequencies to be....
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The AVANT uses a Switched Mode Power Supply which means the heart of it is a 32khz ramp oscillator which is stopped if the overload protection circuit detects an overload. Without the oscillator running the 8 volt Standby voltage is not generated and is why....
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The circuit was designed to create a frequency convert with the use of a crystal oscillator for the conversion of 10 MHz to 1 MHz. 7404 a hex inverter u....
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How to construct a circuit on veroboard by reading the schematic. If you`re an experienced constructor, then you will just look at the schematic and start assembly. Experience tells you where to place components and use veroboard space to its best advantage.....
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Any dc voltage source in the 2- to 15-V range can be chopped into a unipolar square wave that has a peak amplitude nearly equal to the dc source voltage-with circuit (lightly loaded CMOS will swing within a few millivolts of each rail at low frequencies).....
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Here`s an updated schematic with the RF Solutions receiver and some other small additions. There`s a lot of extra circuitry to deal with the signals....
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I designed this circuit for one friend of mine to be used as a small portable DJ mixer. The circuit is an audio mixer circuit so simple as it can be. There are two dual logarithmic potentiometers in the circuit to adjust the input signal levels and some....
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With graphic equalizer we make selective cutting off or boost, of selected departments of acoustic spectrum. With this way we can adapt the musical reproduction, in the characteristics of space where we hear. This can create however also problems if go to....
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This PSU has been especially designed for current-hungry ham radio transceivers. It delivers safely around 20Amps at 13.8V. For lower currents, a separate current limiting output, capable of 15ma up to a total of 20A has been added. Let us see what we have....
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The circuit consists of eight cascaded identical cells, each ccll being a dc-controlled active phase shifter. Because the dc control is common for all shifters, the circuit is adjusted by trirtuiiing RA so that the phase difference between and Vi is zero.....
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In this circuit, IC1A and IC1B act as a monostable multivibrator. Any input from the sensors SI through..
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Check your work for possible dry joints, bridges across adjacent tracks or soldering flux residues that usually cause problems. Check again all the external connections to and from the circuit to see if there is a mistake there. - Make sure that all the....
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Noise level measured into 75ohm 3.1kHz BW using Siemens D2006 level meter: -80dBU (77.5mV)
from zero to 1MHz and drops 3dB on 17MHz. Decrease the first coupling capacitor (68nF) to 10nF
to increase the lower limit to 50kHz. The amplifier is copied from....
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The following circuit shows about LM555 IC Motion Detectors with Infrared Sensors. Features: produces an infrared pulse modulation 5KHz, Bandwidth control also ....
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Everytime the push-to-talk button is closed the light will go on. The antenna samples the output RF from the transmitter. That signal is then rectified (detected) by germanium diode Dl, and used to charge capacitor C2. The dc output is used to trigger a....
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The IR photo transistor Q1 (Radio Shack 276-145A) or similar is connected to the set input (pin 6). The photo transistor should be shielded from direct light so that the voltage at the set input (pin 6) is less than 1 volt under ambient conditions and moves....
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Rectifier bridge voltage. See U2 element you used data sheet to know about maximum voltage it can work properly. On the other hand the minimum voltage on that pin mustn`t drop bellow c. a. 9V, or 6. 5V if low drop type U2 and U3 voltage regulators were used.....
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The purpose of this project is to construct a computer that uses the combined computational power of many microcontrollers (MCUs). All the MCUs cooperate to solve one problem. The computer is defined as parallel processing machine and the algorithms that....
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Prior to the advent of FET-input digital multimeters (DMMs), the vacuum tube voltmeter (VTVM) was the primary instrument for use when high input impedance was required. For the newcomer to electrical measurements, high input impedance for the measuring....
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The market may be full of these hi-end remote controlled toy cars, but for a hobbyists making one at home can be entirely a different experience. The article belowexplainshow to configure a simple remote controlled toy car using a ready made 4-relay remote....
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The PCB for this amplifier can be purchased from Spare Time Gizmos for $16US. In a single afternoon you can have the whole board assembled and dropped into a chassis of your choice. The value and type of component is laid-out in the parts list. But what I....
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This setup allows you to allocate the pins of an mbed for a specified interface without having to recompile the code. It uses a PS/2 Keyboard as an input device and an LCD as an output device. It can take commands and interpret them according to predefined....
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With the inspiration from lab 3, Digital Waveform Synthesis, I want to make a project that can process and playback music. Some songs are pre-stored in memory. They can be played back just like a real piano keyboard. Also the user can input a song on a....
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V1 and V2 are set to 5V in the simulation, but could also be 10V to eliminate the need for a second supply ” or, if you can find logic level FETs at that high a voltage, then you can reduce the 10 volt supply to 5 volts. Assuming that the switching frequency....
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This circuit will emit an intermittent beep (or will flash a LED) when the water contained into a recipient has reached the desired level. It should be mounted on top of the recipient (e.g. a plastic tank) by means of two crocodile clips, acting also as....
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Can simulate the character Mu symbol, I need bone dish SET code which benefit s decimal point well Jl; inverted J to open his mouth. Left foot [ circuit diagram ..
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RS-232 Serial Interface Status Indicator Circuit. I designed this circuit many years ago and have used it several times since. It uses a single logic IC to indicate the TXD and RXD...
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Class D audio amplifiers are now geared up to replace class AB An integrated high voltage audio driver facilitates the design and construction of a high power....
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Electronic bass equalizer type of two quad op amp circuit, you can use TL084 high-speed operational amplifier circuit shown in Figure 9-680 left and right channels through R1, ..
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This document describes how to construct a dual polarity linear power supply which can be configured for any positive or negative voltage between 1.2-35V. A power supply is the fundamental building block of all but the simplest of electronic devices. It....
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This is a circuit that is known as wien bridge oscillator circuit. The circuit has positive and negative feedback loop. This circuit is work with control by op amp. This is the figure of the circuit. The circuit oscillates at a frequency determined by the RC....
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This amp had hum and nosise. So I added cpacitors at power supply, but Voltage was high. There was spark at final tube socket pins. So I pulled off capacitors...
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In a grid driven amplifier it is necessary to match the low impedance of the driving transmitter (typically 50 ohms) to the high impedance input of the tube (typically several thousand to several million ohms). The signal from the input jack travels via....
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Here`s a dual-band Regen that came from some encouraging emails from Jerry (K9UT) and another gentleman named Harvey, who built my original AGC-80, and its experimental "Regenerodyne" successor, the AGC-80/30. Jerry and I have corresponded on several....
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This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which is proportional to the measured temperature. The output frequency bursts are conveyed into the....
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A servo contains a small motor and gear box that rotates a shaft to a precise location and holds it there. This photo shows a typical servo with its top removed. The position of the shaft is based on a digital signal. Most servos rotate through a 180 degree....
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The problem with amplifying weak radio signals is that you also amplify the noise. What you can receive depends on how much background noise is present, whether it be man made interference or static. In this design the RF signal is first met by a resistive....