Popular Circuits Page 221
- Page 221
-
-
-
Quote: Originally Posted by rntlee The only schematic of this amp I`m aware of is this one(I got it from Song @ Canadian Hifi Online):Attachment 238521 It`s possible ....
-
Overview: The DS8500 is a single-chip modem with Highway Addressable Remote Transducer (HART®) capabilities and satisfies the HART physical layer requirements. The device integrates the modulation and demodulation of the 1200Hz/2200Hz FSK signa....
-
The input cap for The phototransistor at the bottom is what feeds the opamp. But the output from the phototransistor is always between GND and Vcc. So why the need for an input capacitor It`s most likely there because the photo transistor is not being....
-
Jumping ahead just a little The YouTube video below illustrates how quickly and easily the system is set up at the launch site My to....
-
This article aims to show you how to control a DC motor though an H-bridge driver chip using the PWM output from a PIC to achieve speed control. Although I am using a PIC microcontroller other controllers such as AVR`s, Basic Stamps and certain Picaxe`s can....
-
-
The schematic for a monostable multivibrator is shown in figure 3-11. Like the astable multivibrator, one transistor conducts and the other cuts off when the circuit is energized...
-
This circuit is intended to signal when a plant needs water. A LED flashes at a low rate when the ground in the flower-pot is too dry, turning off when the moisture level is increasing. Adjusting R2 will allow the user to adapt the sensitivity of the circuit....
-
The electric car remote control circuit diagram not only can make the model car move forward and backward, but also turn left and right turn, it is simple, easy to operate. Radio remote control receiver demodulation circuit uses TWH9238 components, the....
-
The clock will have 6 digits and time setting will be done by means of a few buttons. I will try to use the most common types from widely used microcontroller families of miscellaneous producers. I will write the program in C language. Nixies need high....
-
This circuit combines the characteristics of an asynchronous S/R flip-flop and an edge-triggered JK flip-flop. It changes sta..
-
-
Electromagnetic radiation is used in communication. You are more familiar with radiowaves, microwaves, and TV signals. Visible light is also electromagnetic radiation and can be used to transmit a signal. It is a whole new technology called fiber optics. A....
-
In essence, this circuit is a 15 to 20-second courtesy light extender for cars. It is activated in the usual way by opening a door but it also samples the....
-
-
-
This coil operates from 12V or 24V SLA batteries. A pair of car ignition coils are used to provide around 20kV for charging the capacitor bank. The ignition coils are driven by a variable frequency square wave from a 555 timing chip and four large....
-
Audio signal control circuit It shows a typical audio signal control circuit. Two audio signal into the integrated circuit through the switching and tone (treble,..
-
4-wire resistive touch screen. ADS7846 interface circuit. ADS7846 analog chip contains electronic switches and successive approximation A / D converter. Switched by the analog switch chip, the X + (or Y +) positive supply termination ( ), x- (or Yr) grounded..
-
Circuit to control RC servos using 0-10V control voltage..
-
741 opamp is connected as audio oscillator with Radio Shack 276-677 photocells in feedback circuits. When light strikes PC1, its resistance decreases and frequency of audio tone in headphone decreases correspondingly. When light strikes PC2, which is....
-
I made this as a quick project I made to use a lot of the LEDs I recently got. It basically connects via a 555 8 pin IC and allows for adjusting the t....
-
The circuit is designed to drive an external load. A fault condition in the external load circuit could feed excessive current or voltage back into the line drive circuit. If excessive voltage appears from the load, the two zener diodes will clamp that....
-
This jam circuit can be used in quiz contests wherein any par- ticipant who presses his button (switch) before the other contestants, gets the first chance to answer a question. The circuit given here permits up to eight contestants with each one allotted a....
-
This UC3906 battery charger circuit controller contains all of the necessary circuitry to control the charge and hold cycle for sealed lead-acid batteries. The UC3906 battery charger circuit is specifically designed to provide the proper charging voltage and....
-
-
-
This simple circuit allows you to record any IR remote control signal on your PC, and then play it back. This is particularly useful if you want to control appliances such as TVs, VCRs, CDs etc. from your computer. The device simply connects to the parallel....
-
Morse Tutor is a program written in C++. It can be used for learning or sending morse code. Morse code uses long (dash) and short (dot) sounds to communicate. The dot is the basic unit and the dash is equal to the length of three dot's. Morse Code was....
-
Here is a project of a simple dark detector LED circuit. In the previous topic we have discussed a light activated LED circuit. By simply changing the positions of the resistors and LDR we have converted the circuit in a dark detector LED or dark activated....
-
The heart of the circuit is ICZ, a 4046 micropower phase-locked loop (PLL). The incoming signals are fed to the PLL after being buffered by IC1a and its associated components. The frequency of the incoming signal is multiplied by either 90, 60, or 45,....
-
-
Industrial grade clear glass sensor modules are widely available but not within the reach of an average electronics hobbyist. The simple clear glass sensor....
-
Here is a quick guide, which will help you to get started off with kiCAD. In this tutorial we will be considering a simple astable multivibrator circuit using 555 timer IC ..
-
A Burrough`s B-7971 Nixie Tube clock that I built back in 1979 when I was a senior in High School. The digits are 2 ½ inches high which allowed me to read the clock from anywhere in my bedroom without needing to wear my glasses. The clock circuit is based on....
-
This 555 timer based PWM controller features almost 0..100% pulse width regulation using R1, while keeping the oscillator frequency relatively stable. The frequency is dependent on values of R1 and C1, values shown will give a frequency range from about 170....
-
-
This circuit is designed to operate an electrical door-release mechanism - but it will have other applications. When you enter the four-digit code of your choice - the relay will energize for a preset time period. Use the relay contacts to power the release....
-
Circuit shown in Figure, the circuit can achieve greater power output, just change the part of the device. FIG circuit R1 to the left, L1, D1, C1 to C7 are conventional common ..
-
This bicycle safety flashing light system is based on a newly invented electrical generating system, NO battery needed, No friction on any parts of the bicycle. No drag. get the energy almost free (at least on bicycle). Very bright. Standby light....
-
Following a hunch, the author discovered (or re-discovered?) that all plants carry an electric charge relative to the ground. This charge is more or less constant regardless of the size of the plant - a kind of "background voltage" in nature. This electric....
-
This circuit uses the versatile MAX038 function generator. Although in this circuit some of the advanced characteristics of this IC are disabled, you can generate Sine, Triangle, Square waves (adjusting A0 and A1 pins see datasheet on www.maxim-ic.com if you....
-
The tuned circuits of capacity and inductance used in vacuum tube transmitter circuits are frequently called "tank" circuits, because from one viewpoint they act as tanks or reservoirs of RF energy. Blocking Capacitors. -Blocking capacitors are used to....
-
This is a collection of various useful and interesting schematics. Some of these are also referenced by or included in other documents at this site. What isn`t here (this may not be everything): * Extremely important safety information. See the document: "....
-
The circuit above illustrates using the IR receiver module along
with a PIC12F629 microcontroller to decode 5 individual IR remote
control keys so the circuit will only toggle one of the 4 outputs
when a particular key is pressed. The 5th key is....
-
When any particular key is pressed, its value will appear in BCD form at the outputs (A, B, C & D). It will remain there until another key is pressed. The 12 keys produce outputs up to "1011". Extended to 16 keys, the circuit will give the full HEX to....
-
This simple LED Light flasher project uses a Hex Inverter 74C04 IC to generate a square wave pulse which is used to alternately ON and OFF two LEDs ..
-
This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Aprroximately 0. 7 Volts are dropped across the transistors b-e junction, leaving a higher current 12. 3 Volt output supply. This circuit can supply loads of up to 500....
-
The circuit consist of 10 k and 470 k resistors. Also one potentiometer resistor and led was used. This circuit is used for learning Arduino programming later in class...
-
-
The device exhibits 24V at no load on pins +4, 5 and -7, 8. According to Wikipedia, this is called a passive power injector. I tried drawing 1A from the device and failed (some protection drops the voltage to 0V). @W5VO, thank you for your care of the....
-
Here we explain a couple RF 433kHz remote control chips especially designed for the purpose. The IC TWS-434 along with its encoder chip HOLTEK`s HT-12E form ahigh class transmitter circuit, whereas the chip RWS-434 through its complementing decoder IC HT-12D....
-
Just about any power transistor can be used in this megaphone. Its suitable for boats, playing fields etc. the transistors Q1 & Q2 are the HEP-230 type which are easily available in the market. The transistors are parallely connected to handle the required....
-
-
Here`s a simple project that sends continuous or switch controller MIDI messages that correspond to the position of a potentiometer. Given a few parts and a cannibalized volume or wah-wah pedal, you can build this MIDI controller pedal and have the ultimate....
-
Each motor with independent drive, but only one frequency for a given device, which uses the same RP potentiometer to achieve a multiple motors in parallel. ..
-
Although there are many different configurations for Crystal Oscillators, the most common are the discrete and integrated circuits Pierce and environment RLC Bridge. When needed very good frequency stability and reasonably simple circuits, the discrete....
-
I was particularly enamored over the mechanics of the Quantized Random Voltage function. The thought occurred to me that, instead of having fixed quantization steps for each output of of the 4006 shift register, it might be fun to actually make the....
-
-
This circuit is a church bell controller. Basic component is an ATmega32 microcontroller. At the circuit 1 24LC32 eeprom memories is being used. As control I created a menu who will be appeared on 4x20 LCD (Liquid Crystal Display). The menu browsing can be....
-
The switching power supply, shown in the schematic, provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit. The supply was constructed in 1984 and is variable....
-
-
-
A robot that operates when you give messages through your phone. Your mobile becomes your remote controller of your robot. Yes, it means if robot is in London, and you are in Mumbai, you can still control your robot. A super project for diploma students that....
-
Constant current protection circuit type, since the over-current and short-circuit, the output current is limited only to a certain value, the output voltage drops, the overcur..
-
This circuit delivers either 4. 8 or 7. 2 V regulated at 15 mA with a 3-V input from a bank of photocells. Rl should be 453 kQ for a 7. 2-V output and 274 for a 4. 8-Vdc output. Regulator efficiency is around 70%. This should be considered when selecting....
-
This is a good Electronic project report on Speed Control of DC Motor using Microcontroller by using PWM. In this system, a micro controller is interfaced with a LCD, Keypad and DC motor driver. The Micro controller is used for controlling the DC motor by....
-
-
The M15m Tracking Transmitter is a modified version of the M15 Animal Tracking Transmitter. It has been designed to be used on 147. 460 MHz using an inexpensive 49. 152 computer crystal and for printed circuit board construction. The M15m transmitter is a....
-
A circuit configuration is relatively new strong key touch-state switch. Normally, product thyristor VT1, VT2 are in the off-state I-what little light the lamp F. At this point..
-
This page presents information on infrared - `Across The Track` train detection circuits. The circuits are designed around the LM339 comparator chip and can use a wide assortment of matched infrared - emitter / detector pairs. The basic circuit shown below....
-
As shown for the single-phase bridge rectifier arms rectifier circuit. The circuit consists of arms cathode (negative electrode) and arms parallel anode (positive electrode) in..
-
Explanation Here is a simple fire alarm circuit based on an LDR fire detection sensor. Smoke generated during circuit generates an audible alarm, fire smoke in case of fire. Al..
-
Disco anyone? Actually, this strobe serves a much more useful purpose then making it look cool when you dance in the dark. You can use it to view fast moving objects, look for craks in PC boards (hold the strobe on the trace side of the board and look from....
-
Bartels AutoEngineer® (BAE) is a famous EDA/CAE/CAD/CAM software system for schematic capture, printed ciruit board design and IC/ASIC design. Bartels AutoEngineer® software runs under Microsoft Windows, Linux and various X11/Unix systems...
-
Starting from a 30 volt power supply this high voltage converter circuit can deliver a voltage between 0 to 3 kV (version 1) or from 0 to 10 kV (version 2)...
-
Two line intercom plus a telephone changeover switch. The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom. Usually a single telephone is connected to a...
-
The goal of the project is to develop a system, which uses Mobile technology that keeps control of the various units of the home appliances, which executes with respect to the signal sent by the mobile. For utilization of appliances the new concept has been....
-
-
The following file is an application note describing the two stages of electronic ballast for a 250 W HID metal halide lamp. The components include....
-
I have received several emails asking how to connect up some lights so that when the phone rings, they flash. This is very useful in a situation were there is lots of noise and it is impossable to hear the phone, such as a workshop. Here is such a device...
-
The following circuit shows about Bass And Treble Controller Circuit. This circuit built based on the classic Baxandall tone control circuitry ....
-
The UDA1350AH is a single chip IEC 958 Audio decoder with an integrated stereo digital-to-analog converter employing bitstream conversion techniques. Besides the UDA1350AH which is the full featured version in QFP44 package, there also exists the UDA1350ATS.....
-
Asymmetric third order Butterworth active crossover network circuit diagram as follows: ..
-
Cl capacitor feedback amplifier output signal diversion effect. In the bass, ct t is not similar to the open diversion effect. As the frequency increases, the streaming effect ..
-
A high voltage power supply for an electron beam system. The voltage regulator is an old analog system that works via a simple comparator and reference signal from a POT. My problem is the feedback voltage from the high voltage tank (tank meaning large steel....
-
The schematic of the SAVER V3.2 is depicted in Figure 1.A transformerless power supply uses Xc of a 0.22uF capacitor to limit current providing about 10mA current source. The diodes rectifies ac current to dc current which in turns charged to filtering....
-
7 feet for loudness compensation control terminal, the foot plus the DC control voltage can be composed of simple loudness compensation, was obtained additional high bass boost..
-
I have designed the attached circuit for detecting how long an ultrasonic pulse need to to travel a distance. the input signal is going to be from a 40 k ultrasonic receiver. First stage is 40k Band pass - 1k pass band - differential MFB filter with a gain....
-
LDO regulators- basic theory, circuit schematic, practical LDO regulator circuit using LM2941 5 to 20V adjustable o/p ,1A output current....
-
A rf field indicator is required to verify power stages and transmitters antennas. With this radio field indicator you can measure radiated energy from ant....
-
Acoustic detector consists of a Schmitt trigger IC555 connected components. Just input exceeds a certain voltage, its output will change state, from high to low. R4 to set the ..
-
-
You`ve probably seen many of these toys. They`ve been around for years, from the talking tickle me elmo to the talking furby, like the one shown above. How do these devices do what they do when you perform an action such as tickle them or press a certain....
-
A variable dock-pulse generator is made up of two sections of IC1 (a 4069 CMOS hex inverter). Rl, Sl, and capacitors Cl through C6. By adjusting Rl and switching one of the capacitors into the circuit, the clock"s pulse rate can be varied over a wide....
-
This Simple Portable FM transmitter includes a limiter, a microphone amplifier and a PLL digital tuning. All the components are placed on one circuit board. The RF power is switchable between 1 W (HI) and 0, 2 W (LO). The schematic diagram is split into 3....
-
A popular circuit known as a Hartley oscillator. Its identifiable feature is the tapped coil in the LC tank circuit. Notice that the coil`s tap point is grounded. The amplifier portion of the oscillator is a common-emitter amplifier. Therefore, the ac base....
-
This circuit comes from U.S. Patent 3, 778,800, granted to BRK Electronics in Aurora, IL. The circuit provides a smoke detector with an alarm for both smoke and low batteries. The R6/R7 voltage divider monitors the battery and will turn Q2 and Ql off when....
-
Although this may be a basic question but I`m still struggling with it. In this schematic, two zener diodes D1 and D2 are connected back-to back across relay coil L1. The BVds = -30V for Q1. Can I use 15V(Vz = 15V) zeners for D1 and D2 instead of 5. 1 V....
-
The schematic diagram come from circuit: 60 Watt Switching Power Supply power supply. Go to that page to read the explanation about above power supply related circuit diagram. The schematic shows the power supply capacity of 70W stereo amplifier Power....
-
Pinout of OBD-2 ISO 14230-4 (ISO-9141-2, KWP2000) RS-232 cable schematic and layout of 16 pin car OBD2 special connectorshould be suitable to vehicles of most European and Asian manufacturers. Alfa Romeo, Audi, BMW, Citroen, Fiat, Honda, Hyundai, Jaguar....