New Circuits Page 194
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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....
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Xbox controller, a rapid fire mod. All it has to do is send a ground signal to one spot really fast. I make this schematic and sell it(an of course use it): What I need is a chip that thinks that that schematic is in it. Dont suggest a 555 timer, because....
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Flash slaves are used when you need to supplement one flash unit with one or several more. This slave trigger simply triggers those other units. It does this by "seeing" the first flash (using a phototransistor) and triggering the other flashes a few....
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Micropower and low-voltage op amps allow you to build high-performance analog-signal processors that require no batteries or wall transformers. Instead, you can use a capacitor as a power source. The circuit in Figure 1 shows an analog mixer designed for....
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Connecting a condenser capsule to the grid of a tube amplifier, in order to build a tube mic. In this part we consider how to connect a capsule with two diaphragms in order to get a multi-pattern mic. First let`s examine the different pickup patterns....
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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 proportional to the measured temperature. The output frequency bursts are conveyed into the mains supply....
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Field Strength Meter Using A Biased Schottky Detector A temperature compensated Schottky diode is used in an amplified, untuned field strength indicator that is powered by two AA cells idicates the relative field strength of RF fields from a few kHz into the....
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Create a device that did not rely on gasoline, was simple to operate, could be used as a backup energy source, and to share with others how I built the device. The how-to video series is setup very similar to my previous large project which was showing....
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This project was inspired by a sense of wanting to build something a little unusual rather than with the expectation that it would become a useful transmitter. At the time of writing I`m at the breadboarding stage and have yet to decide if I will keep the....
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This is a stereo VU booster circuit diagram based on transistor FCS9014 which usually used for pre-amp and regulator circuit. This circuit should be connected to audio channel before amplifier module. If you are using tone control or equali....
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This page provides links to software and hardware designs contributed by Handy Board users. If you would like to contribute some work of your own to the Handy Board community, please contact Fred Martin. Thanks! George Musser contributed an adaptation of....
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The first board was digitally controlled but the actual welding current is analog. This allows the board to operate real time without the need for the CPU to process the voltage/current. A block Diagram is shown below: It is basically a switching power....
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This circuit is permanently plugged into a mains socket and NI-CD batteries are trickle-charged. When a power outage occurs, the lamp automatically illuminates. Instead of illuminating a lamp, an alarm sounder can be chosen. When power supply is restored,....
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I am feeding that box with 12 volts, and it has a sequencer board, some external relays to drive the coaxial relays, preamp and the amplifier. As you can see, this sequencer board has some DIL relays, they are only intended to drive external relays that....
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LEDs are used more and more in motor vehicles, replacing the standard incandescent lamps because they are more energy efficient and have a much longer life expectancy. In this article we describe a simple LED tail light that has been specifically designed....
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This circuit diagram shows how a 555 timer IC is configured to perform as an astable multivibrator. An astable multivibrator is a timing circuit whose `low` and `high` states are each unstable. As such, the output of an astable multivibrator toggles between....
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These are circuits of high impedance low capacitance buffer and high impedance low capacitance? amplifier. First figure is a high impedance low capacitance...
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Wireless remote control transmitter circuit is composed of control buttons S1 ~ S16, resistors R1 ~ R3, capacitor C1 regulator diode VS, crystal oscillator BC1, DTMF encoder IC IC1 and IC2 wireless remote control transmitter integrated circuit components. It....
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Function: step down the antenna impedance from ‘high to to 50? and not, as would be expected, to effect a change from balanced to unbalanced. Component: ....
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About telephone tapping. TSCM bug sweeps telephone, computer data lines, and bug sweep offices to free them of electronic eavesdropping and wiretaps....
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A project called LED Flasher which Flashes LED`s one by one . but I have following Query about my project . if anyone can explain me it in simple words it will be great help for me . one can use Below image for reference or use this link..
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AM radio built around 555 timer chip. The only active device (silicon, germanium, or otherwise) is the LM555. The tuning is accomplished with an inductor and a capacitor, and the LM555 acts as an AM demodulator and class-D power amplifier to drive the....
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This simple amplifier is ideal for adding a headphone jack to equipment that lacks this feature. The Headphone Buffer circuit board is small enough (1. 2" X 1. 4") to squeeze into even the smallest spaces and power requirements are so low that existing....
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Amplifier circuit with IC STK is tough and good quality. In this article an amplifier circuit with IC STK another base. Power "Amplifier 200Watt By STK4050. Auto Wiring Diagram Advanced Symbols. Wiring Diagrams Color Coding For The Speaker Wiring On A 1986....
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Some of the components for the EQ are mounted on the pots. The only additions I`ve made to the circuit from the last posted schematic is to add a feedback loop from the line output to the switched side of the first input jack, so that the connection is cut....
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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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Clipping is one of the main problems that causes distortion in amplifiers. It causes the amplitude level of a waveform to drop suddenly before it reaches the limit that it was supposed to reach. Well, here is a simple circuit that will help to detect the....
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A small project that will make you expert in using these displays in your own projects. We will make a system that can display any number between 0-9999 using four of these displays. We will design a function Print() that we can use on latter projects to....
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This circuit is basically simple and easy to build, it uses two transistors as active components and a few passive components like resistors, capacitors and two LEDs. The circuit makes use of the MPS2222 transistor. You can use any NPN type transistor as the....
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There are also other methods of coupling signals from one stage to another. Transformer coupling is the most common method used to couple rf amplifiers. Transformer coupling has many advantages over RC coupling for rf amplifiers; for example, transformer....
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A piezo is an electronic device that generates a voltage when it`s physically deformed by a vibration, sound wave, or mechanical strain. Similarly, when you put a voltage across a piezo, it vibrates and creates a tone. Piezos can be used both to play tones....
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Library routines for 3-wire LCD interface based on 74HC595 shift register. More details are provided in the attached ReadMe document or posted at Do you want to unsubscribe in order to stop receiving notifications regarding "MikroC Pro for PIC driver routine....
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The two drawings using the LM324 op amp to form a lower voltage comparator, resistor R1, R1 component partial pressure circuit, the op amp A1 is set at a level U1; resistor R2, R2 voltage divider formed for the op amp Comparison of A2 to set the level U2.....
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The phase shift oscillator of Figure above produces a sinewave output in the audio frequency range. Resistive feedback from the collector would be negative feedback due to 180o phasing (base to collector phase inversion). However, the three 60o RC phase....
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An expanded scale voltmeter (ESV) can save your plane. That may be a strong statement, but it`s true. The crucial radio link that lets you control your plane relies on nickel-cadmium (NiCd) batteries in the transmitter and receiver. If either of these....
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These goals were achieved by using a discrete-components op-amp driving a BJT complementary common-emitter output stage into Class B operation. In this way, for small output currents, the output transistors are turned off, and the op-amp provides all of the....
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This LED (Light Emitiing Diode) display consist of 10 LEDs to indicate the level of an input signal. If the signal is small, only LED#1 will light, and if the signal level getting higher then you`ll se the light dot will move through LED #2, #3, #4, and so....
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L2 RFC (resistance 1MOhm with wrapped around her inductor of enough coils from fine isolated wire. Scratch of utmost inductor and you stick in utmost the resistance making thus a parallel L-r circuit. ) With their C7, C8 we adapt the resistance of aerial....
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On a continuing mission to build an autonomous sailing robot we needed a way to more rapidly prototype boat designs and wanted to use a standard remote control model control system to save time by using off-the-shelf parts. When controlling servos with....
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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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This circuit is very useful while checking/operating counters, stepping relays, etc. It avoids the procedure of setting a switch for the required number of pulses. By pressing appropriate switches S1 to S9, one can get 1 to 9 negative-going clock pulses,....
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This is a design circuit for tone/frequency detector (decoder) circuit that can be used to detect the presence of a signal with a certain tone. The output of the circuit will be active if the signal is the same tone with the tone of a series of internal....
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Achieving the highest possible performance from circuits used in third-and fourth-generation wireless systems is driving a tighter integration of previously disparate tools. Certainly, a level of software synergy is essential when designing circuits for use....
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The following is an account of such an undertaking. Recently I was involved in a design review for a cost reduction project, where an older design was getting an update. The new design was a merging of two different designs, including someupdated parts and....
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Switching of feedback resistors for opamp driven by Radio Shack 276-115 selenium solar cell gives multirange linear light meter. With 1000-megohm resistor for highest sensitivity, star Sirius will produce pho-tocurrent of about 25 pA when aolar cell is....
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This is NIMH Battery Charger using IC LTC4060 Electro Suite, a NIMH battery charger which is powerful, effective and efficient. Features of the IC LTC4060 is a specialization of a NIMH battery charger. NIMH Battery Charger with IC LTC4060 can perform safely....
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Here is a simple and easy to make heat or temperature sensor alarm circuit. A good feature of this circuit is that it will produce beep-beep sound and flashes an LED according to the temperature....
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This circuit can switch two or more devices on and off in response to a series of rapid handclaps. The claps are picked up by an electret microphone and a....
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When the switch is pressed C3 charges up through R4 with a time constant of 0. 47 seconds and when the switch is released C3 begins a slower discharge through R7 and R3 with a time constant of about 5 seconds. The op amp 358 used in this project is set up as....
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With sine-wave input, RCA CA3046 transistor array connected as VCO can be used as low-distortion FM signal generator. With sawtooth input, same arrangement serves as wobbulator. Increasing size of timing capacitor reduces op-erating frequency, permitting use....
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This low cost AVR development board can be used to get started with 40 PIN AVR devices or to test and build projects easily. Get this board along with our USB AVR Programmer and you have complete development and learning platform. The bundled CD provides all....
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Here`s a design circuit for frequency modulator that is completed with tuning circuit. In this circuit is using pair of 1N4007s are used as varactor diodes. I picked 1N4007s not because they are particularly well suited, but simply that I had some on the....
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In the datasheet, you will see the L200 application circuits diagrams such as Programmable Voltage Regulator, High Current Voltage Regulator with Short Circuit Protection, Digitally Selected Regulator with Inhibit, Programmable Voltage and Current Regulator....
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I am now looking to make a power supply adjustable cv 0-30v and would really like it to be adjustable cc as well. I have found various circuits for Cv, but very ....
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This application note outlines the implementation of a single-supply, triangular wave oscillator using the MAX9000 and some passive components. The application circuit uses an op amp, comparator, and a voltage reference as active building blocks. The MAX9000....
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Build Your Own Door Bell Chime using 555 timer integrated circuit, a speaker, 5 resistors, 4 electrolytic capacitors, 1 ceramic capacitor, 3 diodes, 1 pushbutton switch and 9 V battery as power supply....
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This is a 5W -150MHz RF amplifier circuit. It applies the MRF123 TMOSFET. The MRF123 is a very high gain FET which potentially unstable at both VHF and UHF frequencies, so the 68 Ohm input loading resistor has been used to enhance the stability. This RF....
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Multi-Mode Running light in this website is simple with families design circuit diagram of multi-mode running light bidirectional and 3 different modes with versatile various electronics project with description...
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This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the relay which turns on the speaker output relay in the audio amplifier. The idea of the circuit is....
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This is a test project built hastily on a solder less breadboard. It uses a LM75 to read the current temperature via I2C and displays the result....
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Provision in the speed of a small engine DC Motor speed control circuit of Service By a small rheostat control In DC motor Circuit diagram...
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This page will be updated as Material becomes available. This New System will essentially replace the original BCD Design originally designed by WB6IGP and N6IZW and appeared in ARRL UHF/Microwave Project Manual. Their efforts were later revised by WA6CGR.....
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This circuit is also use operational amplifier IC LM324 to drive the VN64GA with the error signal and to control output voltage. This output voltage is pulsating DC, which is quite satisfactory for battery charging. This circuit also can be converted to the....
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The MAX2605, MAX2609 are compact, high performance intermediate frequency (IF) voltage-controlled oscillator (VCO) designed specifically for demanding portable wireless communication systems. They combine monolithic construction with low noise, low operating....
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This is a Lithium-ion charger for lipo batteries. Circuit schematic shows configuration for charging single 3.7V lipo battery but voltage can be set to charge several batteries in series. Lipo charger sets a current limit with the LM317, and 1 resistor, and....
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For the last year I`ve been working on a prototype for a Solar Inverter that can be Grid Intertied. A solar inverter takes the 12V DC (or other voltages) from...
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This circuit has to be one that breaks all the internet records. According to the counter on the website above - Top Right (arroncake) - as of May 3, 2013 - it has received 760, 191 views with 412 comments, and today alone - 116 Views. It appears that an....
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A 5v power supply to act just like a switch. I will be controlling it with an Arduino like described here: You won`t be able to drive it directly from the Arduino pin, as most general purpose relays require at least 150mW to switch which is >30mA @ 5V. You....
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Information about building a small radio transmitter, which has a PCB 1. 75" x 2. 5" (45mm x 68 mm) and has a range of about 30 yards or so. The documentation with the circuit says the freq range is 100-108 MHz, but I have found it to be more like 85-100....
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The NE568A( NE568AD NE568AN SA568AD SA568AN 0 is a monolithic phase-locked loop (PLL) which operates from 1Hz to frequencies in excess of 150MHz and features an extended supply Voltage range and a lower temperature coefficient of the VCO center frequency in....
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Here is the circuit diagram of the simple FM transmitter using a transistor. Great performance or range is not guaranteed here, because this is an elementary design. General purpose radio frequency transistor BF 494 (Q1) is used here for obtaining FM....
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Your TVT-MOBI-2 will only display this static image and will not yet react to any data received by its serial interface. With one exception. You can set the internal clock of the TVT-MOBI-2 by supplying a date and a time value, and it will calculate the day....
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Because of the transmitter circuit of the inductive headphone must installed on the room wall or on the ceiling, so the inductive headphone can not be used outdoor, this is the main weak point of the inductive headphone. But the infrared rays wireless....
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Very interesting points Chris and Thoersten, but I`d like to make a little step back. So, talking about my lastest design, this schematic attached....
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Can someone enlighten me as to why there is a LC filter on the op amp circuit. And can I do anything to it to improve the sound....
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One of the advantages of hosting a hobby website is that you meet people through email who have similar interests as you. Ever since we posted Bruce`s first OddWatt project on the site I have communicated with a number of DIY hobbyists who have built the....
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This page provided to the domain owner free by Sedo`s Domain Parking. Disclaimer: Domain owner and Sedo maintain no relationship with third party advertisers. Reference to any specific service or trade mark is not controlled by Sedo or domain owner and does....
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This is a very simple circuit where the PIC and an internal 1kHz sinewave table do all the hard work of making an accurate sinewave. Then it needs only a few external parts for filtering. The sinewave has a very high frequency accuracy as it is generated....
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The above pictured schematic diagram is just a standard constant current model with a added current limiter, consisting of Q1, R1, and R4. The moment too much current is flowing biases Q1 and drops the output voltage. The output voltage is: 1. 2 x....
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Build a two-color camera and a three-color monitor. You can build your camera to pick up any two of the additive primary colors. Just install the proper color filters over the phototransistors or photodiodes. With a matrix circuit and an inverter, you will....
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A very simple TV audio video transmitter circuit can be designed using this schematic diagram. This TV audio video transmitter circuit can be used to transmit video signals from VCR ( or some other device ) to a TV without using any cable. Video signals....