Popular Circuits Page 183
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This is probably the simplest radio that one could ever imagine of making. The circuit is so simple that it could be finished assembling within a few minutes and you are already listening your favorite programs over it. The circuit of a single transistor....
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By the 555 IC Ai, capacitors Cl, Cz and metal plate (tablet) M distributed capacitance Co and resistor Ri to ground, R2 consisting self-excited multivibrator; the R3-Rs and C3 ..
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This project implements a USB device which provides a real-time clock for the purpose of time-stamping events in an non-networked embedded computer environment. For embedded applications where a periodic time-stamp is required (such as entry-system logs,....
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There is increasing interest in using PC and Workstation platforms in reactive sound synthesis and processing applications. However, few operating systems were designed to deliver real-time performance and vendors generally don`t guarantee or even specify....
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The two circuits illustrate opening a relay contact a short time after the ignition or ligh switch is turned off. The capacitor is charged and the relay is closed when the voltage at the diode anode rises to +12 volts....
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Superheterodyne receivers have been mass-produced since around 1924, but for reasons of cost did not become successful until the 1930s. Before the second....
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This simple circuit can be used to program the PIC16F84 and similar “flash memory†type parts. It uses a cheap 555 timer IC to generate the programming vo....
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Whoever thinks about reproducing an interface for the Aladin, should first of all be aware of the fact that there are two different versions of the interface. The first version, easier to assemble, enables the user to transfer dive data from the Aladin to....
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Figure (a) shows the circuit with general inverting amplifier circuit differs only in that series with a 100k potentiometer feedback resistor between the input terminal and the..
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A deviation monitor can be made by connecting some form of frequency modulation (FM) detector to an AC voltmeter and calibrating the meter in units of frequency deviation. One method of detecting or demodulating the FM signal is to use a phase locked loop....
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Simple and cheap, that`s the advantage of this circuit. Although the output power is not high but audio quality is good, because TDA1910 has a very low noise feature. This circuit suitable for use as a student project. ..
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PLL (Ul) is set with R2 to desired tone frequency. LED lights to indicate lock-up of PLL. Reduce signal level (Rl) and readjust R2 to assure lock-up. Delay is selected from counter U3 output. Circuits latches (turns on Q1 to allow audio to speaker) when....
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Here is an example which implements a clock in just 36 lines of perl code. It displays time and date and the upper right corner shows a little icon called "heartbeat". The "heartbeat" is added by the LCDd server. This "heartbeat" icon blinks once in a while....
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The circuit is very simple and incorporates darlington output transistors that will provide more than enough output current than is needed to drive a 3-ohm speaker. The gain may be pre-set for a variety of input levels, making it suitable for amplifying....
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The sound will a little 2W+2W just but enough with 6 sizes are inch 8ohm loudspeakers. as a result still have a voice good loud the moderately. Request friends have fun the circuit amplifies this miniature please yes. If phone your light exceedingly ring.....
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Now we bring you two versions of a homemade digital thermometer with ICL7106 that I recently built. One version uses a LED display, the second version LCD display. In both versions, is used silicon transistor as a temperature sensor. The temperature is....
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One reason why commercial soldering stations are expensive is that, in general, they require the use of soldering irons with inbuilt temperature sensors, such as thermocouples. This circuit eliminates the need for a special sensor because it senses the....
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Although the concept of a totally accessible system represents an ideal situation for users, designers now must limit access toand conceal code sequences forsoftware routines for calibration, diagnostics, memory erasure, system reset, and more. In a system....
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The basic technique is the same like the last lesson except fact that we have added a counter which counts between 0000 and 9999. Our counter increments with 1 second delay. /* ` * ` Lesson nr. 12: ` Multiplexed 7Segment as counter mode ` Done by: `....
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The project†DIY: build sound activated switch†presented here is pretty easy to construct and can prove to be very useful in protecting a particular area from a possible theft or intrusion. Learn how to build a simple sound activated alarm here on....
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This circuit is an Electronic Locker. It is controlled by a switches combination (by a code). There is a switch matrix on the door of the locker. This one is a unit of switches connected into 4 arranged of 4 columns for a total of eight terminals. When we....
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This is an audio power amplifier, with its final stage giving 40 W/8 ? at Class A. The power transistors, are always ON, allowing a very high current to flow....
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The Haynes manuals is extremely confusing regarding the labeling of the relays on Spitfires. The two ways they confuse readers is 1. the illustrations show right hand drive cars with different locations for relays, and 2. the naming of the relays is strange....
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The proposed capacitance is a very powerful assembly to measure in 7 ranges
capacitors of 1 pF to 999 uF, avecune excellent precision of about 10 -3 .
The range change is fully automatic. The display shows 3 digits
with decimal point. Three LEDs....
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The tuning range is determined by coil (L) dimensions and setting of Cl. Coils can be plugged in for multirange use or soldered in place if only limited frequency range is of interest. Cl = 36 pF variable, C2 = 047 disc, D = 1N60 (germanium) and M=0-1 mA meter..
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FIG load test is a control circuit. This external load circuit up to 10A, widely used in the drive test power, the power amplifier, LED solenoids and relays, and the carrying c..
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LEDs are rated at only 30 mA continuous, whereas this circuit runs them at around 50 mA. Not a problem for a low duty cycle with short pulses, but this circuit as you intend has a high duty cycle. Where you might run into a problem is that you`re right at....
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Figure 1 shows the block diagram of a direct conversion RF receiver—the receiver demodulates an RF carrier directly into a baseband signal without an intermediate frequency down-conversion (a zero IF receiver). The antenna, shared by both the transmitter and....
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Involvement is a modified version of the classic circuit of automatic level control signal used in tape recorders. The purchase price of the components (using TL072) does not exceed CZK 60 for a channel. For a range of entry level audio signal may be....
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The "Battery Good" checker. When the button is pressed, the green LED will glow if the battery voltage is above the preset threshold. This version has a higher parts count than the "Battery Low" version, but a bonus is that it can drive an LED to be very....
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A simple battery charger for the Nickel Metal Hydride battery that requires current regulated charging. The charger provides 140 mA current for quick charging of the battery. Power supply section consists of a 0-18 volt AC 1 Ampere step-down transformer, a....
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A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line. Within this physical description there are two very distinct antenna designs: the small....
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Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. The circuit shown is a stereo FM PLL demodulator designed based on the AN7415. C1 is the input coupling capacitor to block any....
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Basically, the circuit is using relay (2 set of Relay for each Motor) to switch the direction of the motor and MOSFET (1 set of MOSFET for each Motor) to control the speed of the motor. I will divide the MOSFET + Relay circuit into 3 part for the....
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8-channel temperature shown detection circuit, it can be 8 temperature detection.. {D581 is 10. OOV precision reference voltage source, to the detection circuit provides precis..
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This circuit has an adjustable output timer that will re-trigger at regular intervals. The output period can be anything from a fraction of a second to half-an-hour or more - and it can be made to recur at regular intervals of anything from seconds to days....
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So you could easily set it for 20 or even 200 Volts Full Scale, Using a Suitable Potentiometer on the Input. DO NOT EXCEED 30 VOLTS to PIN 5 of the LM3914`s. The 20 K resistor Shown across the LED is required to null out the #10 LED, when higer LED`s are lit....
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This TDA1514 audio amplifier circuit design electronic project is capable to provide a high audio power output using a specialized audio IC and other few common components. The TDA1514 audio IC is manufactured by Philips Semiconductor and is capable to....
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This circuit relies upon the extra high input impedance of a FET, and also demonstrates
the gate terminals sensitivity to changes in voltage. The gate terminal here is left open circuit, connected only to the "probe" this being just a few inches of bare....
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This circuit provides symmetrical ±output voltages, both equal to one-half the input voltage (one 9-V battery in this case). The output voltages are referenced to pin 3 (output common). The circuit will operate with other battery voltages. If the battery....
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The modified inverting amplifier uses an active clamp to limit the output swing with precision. Allowance must be made for the V8E of the transistors. The swing is limited by the base-emitter breakdown of the transistors. ..
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Hello All, Today I will show you how you can make a simple RPM Meter using AVR ATmega8. The RPM meter we will be making is a contact less type...
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Physicians and repair engineers often use small light pens for visual examination Spurposes. Rugged and expensive as these pens may be, their weak point is the bulb, which is a serviceable` part. In practice, that nearly always equates to expensive` and / or....
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This scheme is sine wave oscillator, with frequency from 5 Hertz up to 5 KHZ. Capasitor C1, C2, C3 altogether valuable 100pF, yielded frequency 5 KHZ. To get other frequency magnitude of we ready to change value at C1, C2 and C3, like under this...
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Close to human perception and stable color sensing is an ubiquitous problem found in numerous disciplinces, e. g. , in machine vision for classification and recognition or in general intelligent systems, for instance for intelligent illumination systems in....
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The 7MHz CW transceiver made with MC3362P. I made a 7MHz CW transceiver by using the IC for the narrow band FM double super receiving circuit, MC3362P. I intended to make a transceiver for 10MHz band in the beginning. But, I was worried by the neighboring....
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Built for Birkbeck, the microscope controller is a open source stepper motor driver. It uses an Arduino Uno, and arduino stepper motor shield to drive a Phytron ZSS32. 200 1. 2A 3V stepper motor. To move the sample port, we use an inverted Marzhauser....
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This rf probe is coupled with a fiber-optiCJ:able to the test equipment. It utilizes inexpensive components to improve probe performance at UHF frequencies. The receiving antenna in this probe feeds an envelope-detector diode. After amplification by the....
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Here is a diagram of the internals of the MAX232A. It shows a double charge pump voltage doubler and a +10v to -10v voltage inverter. The voltages output are used to generate the RS-232 compliant signals. The MAX232A has provisions for two serial ports on....
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This PC fan controller circuit is designed with discrete components and is used to control 12 V fans that have a current consumption lower than 200mA. With the components values presented in the circuit diagram, the voltage won`t drop below 7V. If the fan....
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This circuit shows a typical over/under-voltage fault monitor for a single supply. The upper trip points, controlling OUT 1, are centered on 5.5 V with 100 mY of hysteresis Wu = 5.55 V, "L = 5.45 V); and the lower trip points, controlling OUT 2, are....
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The circuit above is the canonical AC coupled common emitter amplifier which is typically used as a linear amplifier, not a switch that "turns on" when the input is above some level. Alfred Centauri Apr 9 `13 at 19:26 Edit you question to reflect what you`re....
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This is a simple and low cost desktop headphone amplifier for the office. The amplifier concept is simple and follows a typical single-ended class A circuit....
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The circuit given here can be used to control the brightness of low power incandescent lamps. The circuit is based on IC NE555 which is wired as an astable multivibrator with variable duty cycle. The output of IC is connected to the base of transistor Q1.....
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hi this my 1st post here. topic is a watch crystal oscillator for PIC (microcontroller). i do not want to use logic gates. here the circuit (a thread....
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About every year I design and build a new clock. This years project is a clock based on an Intel 8008 first generation 8 bit microprocessor. Because it is a fairly unique project Im putting more effort into the documentation. Im also totally opening the....
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Transistors Ql and Q2 and their associated components provide: a low-impedance output with the necessary power to drive the output stages, give increased gain tohigh frequencies, and peaking the video for enhanced transient response. Emitter followers Q3,....
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Here is the circuit of an Arduino-based Panic Alarm! The wiring is very simple so that even a novice can construct this interesting circuit without any difficulty. Arduino is a family of microcontrollers (tiny computers) and a software creation environment....
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Using this circuit, we can accept positive or negative or differential control voltages. When the control voltage is zero, the output frequency is zero. To....
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Extend current application circuit The current production of the maximum output current of the integrated three-terminal device is 1.5A. If the output current is greater than t..
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Commonly used single display driver circuit TA 7366/7367 is manufactured by Toshiba Corporation 5 LED driver circuit, it adopted a 9-pin single in-line with plastic structure, ..
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The TDA1519 circuit can deliver 2x6 watts output power. TDA1519 is an integrated class-B dual output amplifier in a 9-lead single in-line (SIL) plastic medium power package is primarily developed for car radio applications...
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I've designed a high-voltage generator which uses a flyback transformer as the output stage. Flyback transformer circuit diagram is shown in Fig. 1. And I like to share some of my findings with you. ..
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This is the 555 Sawtooth Oscillator circuit diagram with the detailed explanation of its working principles. The electronic circuit simulator helps you to design the 555 Sawtooth Oscillator circuit and to simulate it online for better understanding....
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This design has not been called a GOLD detector as this name has been left for the more complex detectors that actually discriminate been gold and other metals. There is an enormous difference between detecting gold and ordinary metals (called base metals).....
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This site is primarily for me to collect together things that I find useful that I don`t want to forget but occasionally I may put together some pages that others may find interesting. Please have a browse and see what you can find. I tried to make the....
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Constituted by a 15V TOP224Y, 2A output DC switching power supply circuit shown in FIG. Using three integrated circuits: ICl is a monolithic regulator TOP224Y, IC2 is optocoupl..
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SW1 should be ganged to P1 to avoid abrupt voltage peaks on the "patient`s" body at switch-on, but a stand alone SPST switch works quite well, provided you remember to set P1 knob fully counter-clockwise at switch-on. Some commercial sets have four, six or....
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Introduction The SP6648 integrated synchronous boost Regulator is a compact circuit that provides a ultra- high efficiency drive current for an LED flashlight using a LuxeonTM I light source. The circuit shown below is configured to provide 350mA constant....
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Circuit is shown. C1 is the input filter capacitor. VDz VD1 composition and primary clamp .png">protection circuit . The control ..
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Micro PSU to power a breadboard with 5 volts. Connect to 9V battery, 12V or any other DC powersource from 8 to 18 volts. Follow the instructions on the site below to build your own mini 5V power supply. Disclaimer All files are found using legitimate search....
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Charge a simple servo that only has + and - pins. Usually I would connect it`s - pin to the ground and + pin to the digital output from Arduino. This works, but the servo turns weakly and can be stopped by hand. If i connect the servo directly to the battery....
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Protect your expensive batteries from discharge damage with this mini-sized electronic cutout switch. It uses virtually no power and can be built to suit a wide range of battery voltages....
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Circuit operation principle of the device shown in Figure 13. When the barbed wire Fe intact, LSE's O, feet collusion between its pin output high,..
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Gray Code. A positional binary number notation in which any two numbers whose difference is one is represented by expressions that are the same except in one place and differ by only one unit in that place. A code composed of a number of bits assigned in....
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This circuit uses the +5 V reference output and the op amp to level shift and amplify the 2.1 mV/°C Tempco output into a voltage signal dependent on the ambient temperature. Different scaling can be obtained by selecting appropriate resistors from the....
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Strictly speaking, this simple circuit shouldn`t work! How could anyone expect an ordinary light dependent resistor photo cell to `see` through a fingertip in natural daylight and detect the change in blood flow as the heart pulsates The secret is a high....
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For most applications, the available power from op amps is sufficient. There are times when more power handling capability is necessary. A simple power booster capable of driving moderate loads uses an NE5535 device. Other amplifiers may be substituted only....
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This circuit [Fig.1] is a class AB stereo audio power amplifier designed by Quasar for quality hi-fi applications using a TDA2005 module. It is easy to construct and has a minimum of external components. The module has output current protection and thermal....
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Using the ISL8012 high efficiency, monolithic, synchronous step-down DC DC converter can be designed a very simple DC DC converter electronic project that can support a maximum output current up to 2A (continuous output current ) from a 2. 7V to 5. 5V input....
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This is a Universal version of the Four-Digit Alarm Control Keypad. I have modified the design to free up the relay contacts. This allows the circuit to operate as a general-purpose switch. I`ve used a SPCO/SPDT relay - but you can use a multi-pole relay if....