Popular Circuits Page 8
- Page 8
-
This is a simple single chip metal detector circuit based on IC CS209A from the Cherry Semiconductors. A 100uH coil is used to sense the presence of metal. The IC CS209A has a built in oscillator circuit and the coil L1 forms a part of its external LC....
-
-
-
This circuit uses the LM358 operational amplifiers (or any single supply op amp) to generate a pulse-width modulated signal. In most cases, I would just use a microcontroller to generate PWM signals. Unfortunately, the circuit was designed for a local marine....
-
This paragraph Easy Car Alarm circuit with the use of fewer components, easy to produce and so on. (1) circuit automobile anti-theft alarm circuit by the time base circuit NE555, power switch VT, the switch S2, the..
-
There are two types of preamplifiers for magnetic phono cartridges. An example of the most common type is the one described in the March 2002 issue of SIL....
-
1995 GMC Serria the ABS light comes on and all hell brakes loose, thrans shifts into limp mode, rpm shoots everywhere, speedo does not work. figured it might be the front wheel sensors I don`t think it`s the wheel speed sensors. It sounds like you`re losing....
-
-
As shown in FIG integrator drift is very small, at a temperature of -55 C ~ + does not exceed 500 V/s within 125 C range. FIG basic integrator constituted by an operational amp..
-
-
ICs requiring 3 or 6 volts can be run from a battery or fixed regulated supply of a higher voltage by using the circuit shown. The transistor should be mounted on a heatsink as considerable power will be dissipated by its collector. Additional filtering can....
-
This circuit was devised to switch power to a Peltier cooler in a vehicle. Power to the load from the vehicle`s battery is switched by a SPDT relay while the ignition switch is turned on and from the SLA auxiliary battery when the ignition is off. The SLA....
-
No, wait.. the 15 KHz is the frequency that you use for drive the flyback transformer, is right, but the high voltage at the output is DC, cause....
-
-
easy to build home made 50 Mhz (6-metres band) vertical half wave antenna! Omnidirectional, high gain, low SWR!....
-
Lots of consumer electronic equipment like TV sets, VCRs, CD and DVD players employs infrared remote control. In some cases, it is desirable to extend the....
-
We propose a comprehensive design procedure to design Field-programmable/Reconfigurable Analog Integrated CMOS circuits. Instead of repeatedly iterative simulation steps to achieve desired design specifications by fine tuning the W/L ratios of the FETs, we....
-
Sequence detection is a common operation in many communication and security systems. Some good examples are HDLC-flag identification and signature analysis. As the complexity of the system increases, designing circuitry for sequence detection becomes tedious....
-
Binary gain step circuit is shown by PGA205 constituted a gain range of 1 to 64. The circuit uses two PGA205 cascade with a total gain of the circuit is the product of a two-st..
-
-
Modern electronics is indispensable for every large model railroad system, and it provides a solution to almost every problem. Although ready-made product....
-
This is simple 3-digits digital volt meter. PIC16F676 used to read analog signal(voltage) and display the value on 3-digits 7-segment. You can apply to mesasure DC currant with parallel Rshunt but I`m not descript here. As we know the most of PIC....
-
A long time ago when telephones were so simple almost nothing could go amiss from an electrical point of view, Telecom operators installed surge protection on all telephone lines exposed to storm risks. Paradoxically, now that we are hooking up delicate and....
-
When spun rapidly between the fingers, a bipolar stepper motor will generate around 10VAC. If this is stepped up with a small 240V to 6-0-6V transformer in reverse (with series connected secondaries), a small bipolar stepper motor is capable of powering a....
-
TDA1308 is class AB headphone driver IC Philips recently launched its biggest feature is the small size, low power consumption, is particularly suitable for portable CD players and other digital audio Xin also be used for CD..
-
For those who want LED-based footswitching without the hassle of installing a battery, I am currently working on a battery-less LED-based footswitch modification for the 2-Channel amps that works with the existing TRS jack and footswitch. This solution will....
-
IC LM4651 and LM4652 is a type of MOSFET ICs and power amplifiers include high-efficiency amplifier, suitable for self-powered speakers, a subwoofer and driver quality car. LM 4651 is a fully integrated conventional pulse width modulation (PWM) driver,....
-
This is a very simple circuit that can be used to sense electromagnetic radiations. The circuit can even detect hidden wrings. A 1mH inductor is used for sensing the electric field. The electric field will induce a small voltage in the sensor inductor and....
-
The SA1140 is an IF system IC designed for FM car stereo receivers. It features versatile muting characteristics which CAN be varied with external parts. By Silan ..
-
This remotely controlled watering system is both inexpensive and easy to expand. It is designed to operate in conjunction with a conventional watering tim....
-
This circuit is uses for the general purpose Big LED with SPI serial interfacing. The circuit is using a serial-in-parallel out shift register, 74HC595 for receiving serial data from microcontroller board. This is the figure of the circuit. For wiring the....
-
This fm rf power amplifier circuit is built with BLY94 transistor which delivers up to 50W at 175MHz and has a power gain of 7dB, arround 5x power amplification. But in this schematic bly94 is working in 3 meter band, FM 88-108 MHz, so it has a higher power....
-
Dancing blanket principle is very simple, it is a direct retrofit keyboard or gamepad. Each key on the keyboard and gamepad are actually a switch, as long as these switch on th..
-
-
This circuit uses the speed and drive capability of the HA-5190 coupled with two high-speed DMOS FET switches. The input amplifier is allowed to operate at a gain of -5, although the overall circuit gain is unity. ..
-
I began tracing the BASH amplifier circuit for my V. 2-400. The following schematics are my best effort to document what I found. I have also described design defects I have found and what I am doing to improve them. Evan Shultz spent an amazing amount of....
-
This is an image Schematic. No Description available...
-
This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems. Lead acid....
-
-
Power Isolation Shown for ISO122P / 124 has three ports amplifier. The circuit also use precision analog isolation ..
-
Circuit principle : ultrasonic anti-collision circuit is shown, when the LM1812 circuit by circuit group to control the transmission and reception of LM1812 (LM1812, ie send an..
-
-
Work of the circuit The circuit consists of low-frequency oscillator, the electronic switch circuit, control circuit, photoelectric display circuit and music alarm circuit. (It is showed in picture 7-113.) Low-frequency oscillator consists of IC lCl (Dl-D4)....
-
Below is a comparator circuit which is can measure with step of 1 volt, the voltage of car battery. The indication of voltage is done by comparison of ....
-
-
This article is about the term counter used in electronics and computing. For other uses, see Counter (disambiguation). In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular....
-
Altogether it will cost about US$ 10 and much room on my circuit board. The design is really great but i don`t have to room for it and i like to spend less. You can drop all off the transistors and resistors if your motors don`t drain too much current. You....
-
Hi! I`m going to build stcs2 based driver for 445nm. I choosed it because it has low vdrop - I`m going to power it from 2x li-ion. I found schematic....
-
Protect your valuable laptop against theft using this miniature alarm generator. Fixed in-side the laptop case, it will sound a loud alarm when someone tries to take the laptop. This highly sensitive circuit uses a homemade tilt switch to activate the alarm....
-
The circuit diagram is shown to the right. You can get a larger version or a PostScript version if you prefer. The design is based around a Microchip PIC16F628A microcontroller. At the time of writing, this device is available for less than one pound from....
-
More and more equipment is sold that runs off internal rechargeable batteries. Although a matching charger is usually supplied in the package, there are also devices that can only be charged via a USB port. That is not surprising in the case of USB MP3....
-
Use some tiny blinking LED`s as fireflies. It takes a bit of electronics skill to do this project but it comes out really wonderful. LED`s are tiny Light Emitting Diodes. Thisis a picture of one of the LED`s I used for this project. It is rather small but it....
-
MAX233 / 233A multi-channel data interface circuit, the circuit has dual output, dual input of the driver circuit, for small digital products, multimedia equipment for data transmission...
-
-
A friend and frequent event-production collaborator has been accumulating legacy Telex wireless intercom gear from various sources, and while the equipment arrives in a nominally working state it sometimes has a few little problems and tends to take a....
-
By judging the rate at which a particular LED flashes, you`ll be able to estimate the resistance. The circuit consists of two IC`s (1 4011 CMOS quad 2-input, NAND gate, Ul; and a 4024 binary counter, U2), seven LEDs, and a handful of additional .components.....
-
This circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power supply (such as the power supply on the "Circuits" page) that is capable of supplying 1 or more amps...
-
To the automatic transmission, there is a judder throught the box in fifth gear only and is more pro nounced when climbing an incline. If you knock it into sport mode and thus change down to fourth gear this judder disappears, it has been to the local ZF....
-
This is a very sensitive envelope detector for AM radio. The circuit (see Fig. 1) provides linear detection of weak signals with modulation depth of 80. 85% The first stage (VT1) is a common-emitter amplifier circuit for input signals, the second stage is an....
-
-
In this project, we will build an audio mixer, which is a device that can add different audio signals together into one output. For example, say, one audio input is a cappella, with a personG ‚¬ s lone voice singing and another audio signal is background....
-
A wood table with many holes with different diameters that house the optical fibers. The size of the ceiling lamp (90 cmx 60 cm) did not allow me to use a single bundle of fibers and this is the reason of the two beams I used, each of which comes with a LEDs....
-
-
To see how RFM12B wireless compares to other similar wireless options (e. g Xbee, XRF etc. ) check out this well compiled comparison overview byStuart Poulton:. 3 different ISM band frequencies: 433MHz (worldwide), 868MHz (Europe), 915MHz (USA & Australia....
-
-
Simple RS-232 ISP programmer for AT89Sx devices. This device is intended for education purposes and for hobbyists. It has been tested with AT89S2051 and AT89S8253 along with USB to serial port converter cable (with PL2303 chip)...
-
The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). Two sets of 20 LEDs will alternately flash at approximately 4.7 cycles per second using RC values shown (4.7K for R1, 150K for R2 and a 1uF capacitor). Time....
-
As shown for the lighting inverter circuit principle 6 ~ 8W fluorescent. The circuit is suitable for lighting 6 ~ W fluorescent tube circuit parameters are marked in the figure..
-
Figure 282 foot another simple power outage should emergency lamp circuit. When the grid is often only power and municipal electricity by T Buck, VD1 ~ VD4 rectification, C- cr..
-
This is a one module of diesel and horn train circuit. This circuit is work with built by 555 timers IC, and some op amp. This circuit is a complete system for the horn circuit. This is the figure of the circuit. The main power supply to the system must be a....
-
To me the E1T counting tube is unmistakably one of the most intriguing tubes ever made. It was invented and developed into a product by Philips in the period 1946-1954. On one of my other pages I have posted an in-depth study of it`s origins. It has long....
-
Indeed the accu charger circuit, the voltage required must be in accordance with voltage batteries, such accu 12 volts the the output voltage should not be above 12 volts and 12 volts should not be too down. If it does not comply with the required voltage,....
-
Boost circuits are an awesome way to power microcontrollers. Instead of 4AA batteries or a 9V (usually regulated down to 5V or 3. 3V), you just boost one or two AA`s up to your desired voltage. The only problems are that boost ICs (like these two ) are a....
-
In this circuit, a CMOS inverter, such as the CD4069, is used to convert the open drain Lx output to a signal suitable for driving the gate of an external P MOSFET. The MTP8P03 has a gate threshold voltage of 2.0 V to 4.5 V, so it will have a relatively....
-
-
TR1 provides a constant current to a bank of three zener diodes, thus maintaining a constant voltage independant of supply voltage variations. The resistor Rx is used to sense the PSU output current and to switches off the current to the zener diodes should....
-
A simple USB powered lamp that can be used to light your desktop during power failures. The circuit operates from the5 Voltavailable from the USB port. The 5V from the USB port is passed through current limiting resistor R2 and transistor Q1. The base of....
-
Its frequency depends on the capacitance of the vary cap diode. The center frequency is changed by varying the biasing voltage of the vary cap through the 47K pot. You can use a 75cm telescopic antenna or simply a length of hook-up wire. Mine worked fine....
-
Design and implementation of a TC237 CCD camera...
-
The program uses two pulsewidth variables, pw1 and pw2; and two sets of routines, left1 and left2, right1 and right2; one for each motor. As you can see in the schematic, the first servo is wired as per the previous circuit. The second servo is now using B3....
-
This 12V power inverter circuit can be used to power small power devices that need a 240 volts. It is very useful when you want to use a 240 volts consume....
-
The major functional blocks necessary to design a general purpose audio oscillator, and give all the details of my current prototype. Implementation is in the mode of an analog computer, since the desired outputs are sine and cosine values as a function of....
-
-
-
Why are four legs connected to the green LED and two to the amber LED in the 4017 traffic light circuit Shouldn`t it be able to do with only one leg per LED Each output is consecutively active for the same time. By wired-OR-ing outputs you can create longer....
-
Although my circuit allows for different combinations of input voltages (Vin) and output voltages (Vout). The case I am debugging is with Vin=3. 6V and Vout=7. 2V. The Load was a 120 ohm resistor. I calculated the duty cycle D=0. 5 (i. e. 50%). This seems to....
-
Experimenting with the window motor. The reason the window motor is so powerful, is the minor current required is an INDEPENDENT VARIABLE from the power of the permanent magnets on the rotors. The true power lies in the magnetic flux lines of the permanent....
-
As you can see, there are few parts to this design, really just the ATmega328p-pu microcontroller and the LCD display. Both of them require a steady +....
-
This was my very first arduino project. Its great for beginners. Fade the color or the lights my moving your hands near it. It fades from a pretty purple blue to a firey red-orange. Its was SUPER easy to build, not to hard to write the code, and its really....
-
This power supply can be used to obtain a regulated power output, variable right from zero to 300 volts maximum. All the devices should be mounted on heatsinks. You must havecome across many power supply circuits which are designed for supplying anywhere....
-
Fortunately, my trusty Arduino came to the rescue I created an Arduino-based AVR programmer that uses the high voltage programming mode and can fix pesky fuses like RSTDISBL. The Arduino has just enough IO to implement the entire HV protocol plus a go”....
-
As shown for the bandwidth of 10MHz broadband linear detection circuit. The circuit is the bandwidth Millivoltmeter measuring instruments, such as used above 10MHz of broadband..
-
Voltage depletion is also called "sag" by some folks. The same general concept I`m covering in this project may be referred to as a 9v sag circuit. I learned to avoid using the word "sag" as many folks confuse it with tube amp sag which is an entirely....
-
This compact LC oscillator offers a frequency range of about 1 kHz to almost 9 MHz and a low-distortion sine-wave ou..
-
This is electronic coin toss circuit using one CD4049 IC (Hex inverting buffer and TTL driver). This IC has six buffers and it may be used independently. The buffers may be used as simple inverters, as voltage translators, or as current drivers for....
-
The 220V AC mains supply is downconverted to 9V AC by transformer X1. The transformer output is rectified by diodes D1 through D4 wired in bridge configuration and the positive DC supply is directly connected to the charger`s output contact, while the....
-
This source is selected by pressing momentary-contact pushbutton switch SI. Switch SI is connected to the trigger of a 555 oscillator/timer (Ul) configured as a monostable multivibrator, wliich generates one short output pulse for each press of SI. That....
-
The project started with a request from a fellow member of the Long Eaton Club, Tony Bowler. He was interested in converting one of the `Golden Oldies` to electric free-flight. He choose Vic Smeed`s "Debutante" to power with seven AE size cells and a....
-
This Circuit is based on the LM3876. A 11-pin plastic package IC with high performance audio power amplifier, an output mute function which can be used to eliminate switch-on and switch-off "thumps" to the loudspeaker load. It is capable of delivering 40W....
-
The LTC®1541 combines a micropower amplifier, comparator
and 1.2V reference in an 8-pin package. The part
operates from a single 2.5V to 12.6V supply with typical
supply current of 5mA. Both op amp and comparator
feature a common mode input voltage range....
-
This project is almost useless, I want just to realize a pendulum that swings endless. Nothing more. No use at all. This is not an original project but my version of a project of the past century, already seen in many different ways on the Net. This is my....
-
A tiny sandwich flag connected perpendicular to the motor spindle aids observation of how long it takes to complete one full rotation. This worked initially, as each burst from the capacitor barely moved the flag 1/4 of a rotation. As the circuit variations....
-