New Circuits Page 94
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Preamplifiers are used to amplify low level signals such as those from mikes, tape heads before they are fed into power amplifiers. Power amplifiers are generally less sensitive. Frequency response also can be suitably trimmed and modified at preamp stage.....
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Hello everyone, this is my first post here. I am building my first circuit (outside of class) and am having trouble tuning my radio. What I have: So....
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This simple circuit allows you to use your oscilloscope as a Time Domain Reflectometer (TDR). This is how it works. Send a pulse down a cable and watch for the...
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This two-transistor white noise generator has a surprising feature about 30dB more noise than the more traditional designs. Q1 and Q2 can be any small-signal transistors with a beta of up to 400. The reverse-biased emitter-base junction of Q1 provides the....
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To quickly determine the remote control transmitter is good or bad, you can use the remote control detector as shown. If the detected remote control transmitter is good, it will instantly audible alarm signal. The detector can be used to detect various types....
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This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like its shown in the table (from 20 W to 80 W RMS)....
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The RF amplifier is similar to the one used in the 2. 5MHz amplifier. At a frequency of 10MHz the capacitances of a power MOS-FET become significant. Noiseless feedback by the use of transformers is no longer straightforward. Intermodulation and overtones....
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Light flashing circuit. This circuit is the small lamp flashing signal on every 1 second flash rate control by adjusting the lamp voltage R1.The rate is to generate...
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This is a little circuit that i designed that could be used for achargingcontroller or voltage limiter. Its very useful if you are thinking of maki. In the assembly of the circuit u can alter the circuit as you please. For instance ididn`tgo as exact as....
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The following circuit shows about Selective Timer Alarm Circuit. This circuit based on the 4060IC. Features: The alarm will automatically turn OFF after the ....
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Nicd battery charger schematic and description. This Nicd battery charger circuit can charge 12V, 6V, & 9V battery packs. ....
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A simple circuit that can be used for testing of bipolar stepper motors or for manual positioning using steppers. Schematics, Arduino sketch and video here..
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This article discuss how you can detect the entry of a person in a room and get this signal inside your MCU. This is NOT a complete project but just an idea that can be implemented in many different projects. The technique is to use use an IR transmitter and....
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I bought one CI-22BG tube and one CI-3BG tube for total of 16G. Because I didn`t have anything radioactive to test my Geiger counter, I also ordered a piece of radioactive Fiesta dinnerware from ebay. Red Fiestware used to have uranium oxide in its glaze....
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The Micon-GHS clock is a very accurate handy clock for mobile observation with some intelligent facilities. `Note that "Micon" is a short form for "Microcomputer" in Japanese. `The clock was operated by referring the GPS (Global Positioning System) signal,....
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The UTC H654 is integrated Hall Sensors with complementary output drivers designed for electronic commutation of brushless DC Fan. It composed of an on-chip Hall voltage generator, a differential Amplifier Schmitt Trigger an open-collector output on a single....
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For the wiring of the display we first of all take the ribbon cable and solder it according to the following circuit diagram on the 25 pin sub-d (parallel port) plug, whereby in my small circuit diagram I described the rear side - consequently the solder....
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The mixer appearance two stereo phono inputs and two stereo line-level inputs and has one stereo bond channel. A microphone ascribe and a stereo capital achievement with adjustable accretion are additionally provided...
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A very simple FM CB radio receiver can be designed using this electronic diagram below. This FM CB radio receiver circuit is designed using an TCA440 integrated circuit. The receiver works with a intermediate frequency of 455kHz. Input filter is 27MF ceramic....
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An efficient, stable, easy to build construction for all your radiation dosimetry needs. I started from scratch, designing a complete dosimeter unit around the Atmel Atmega8 microcontroller and a Russian Geiger Muller tube. Here you`ll see the CTC-1 tube,....
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This is a design for thermometer. This is a simple circuit design. This circuit is based on temperature sensor using LM35 Ic. If you have a digital voltmeter, or any voltmeter with millivolt resolution and high input impedance, then you can use this....
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This circuit generates a dual-tone bells ringing similar to most door-bell units. It can be used in many applications other than door-bell. In the Notes below several options will be given in order to suit different needs. The circuit as shown in the diagram....
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This application note describes the design of a PC-based, 14-bit data acquisition system. It takes a system approach, includes all the necessary building blocks: analog, digital, hardware, and software. It discusses each step, testing systems separately....
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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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At this circuit you can give a variety of utilities, from an alarm, to open a door, turn on a light in the garden or courtyard, and so on. Your imagination has the last word. HOW IT WORKS: The operating principle is based on the properties of a photoelectric....
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The term "mixed-signal" is usually reserved for circuits and ICs that process both analog and digital signals. In that sense the title "A mixed-signal LED clock" is perhaps misleading since this is a digital clock from beginning to end. However, the readout....
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This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs. It operates from 2 high capacity ni-cad cells (2.5 volts) which keep it going for a couple weeks. High voltage (70 volts) for the neon lamps is obtained from a small....
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This circuit was designed and manufactured the `80`s. From then it works without problem. It does not present any particular constructional problem, beyond known: the attention in the provided force of power supply - choice suitable heatsink and good....
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This circuit is a toy to encourage young children to count. Power is turned on by switch S1, then S2 is closed. This makes nine LEDs flash slowly. S2 is then opened and the LEDs go out. Pressing pushbutton PB1 turns on a random number of LEDs - briefly -....
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A simple ambit for converting an audio arresting (such as one that comes from the apostle terminals of a CD player). The ambit basically consists of a buffer/amplifier date and three clarify circuits: a high-pass filter, a mid-pass filter, and a low-pass....
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Sixteenth street control circuit composed of the second decoding output control circuit. Connect an bistable circuit that composed of dual D flip-flop CD4013 to every output terminal of the sixteen decoding. Connect a DC relay on each output terminals of....
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A circuit using a keypad, a servo and a few LED`s. This was connected to my Arduino Uno. Now I tried putting everything onto a single PCB and thus building my own custom "Arduino" into it. The red LED is supposed to shine and the servo must move to a certain....
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The voltage measurement is very general in electron technology at present, accuracy requirement and functional requirement for the instrument are higher and higher, especially under the situation that the signal power to be measured is with maximal phase....
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8 solid-state-relay (SSR) and ADAM-4068 (Serial-I/O device) and ask me to wire a circuit to control a motor for his robot. ADAM-6048 is a handy device that let you control digital input and output via RS-485, serial communication given a protocol in its....
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First Response Monitor, Input Selector, Game Circuit You can find first response using this circuit, because it helps many response monitor, games....
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This is a very Function Generater project. can be used Triangle and Squarewave Generator. The main parts are CD40106 popular CMOS IC and a normal transistor is....
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Can anyone point me in the direction of a simple useable circuit i can build for testing crystals? I have seen loads of circuits as i am googling....
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As with your square wave, you will interfere with people`s radios, & they will become quite upset, plus you may attract the attention of the licencing authority-& believe me, you don`t want that! you need I believe a colpits oscilator, this will have a "tank....
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Here`s a design circuit that has function that it will help to filter out the interference signal and ensure that the signal received from the Morse code station stand out. This is the figure of the circuit; The earliest mode of radio communications is the....
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Development board for 18 pin PIC microcontrollers with power supply circuit, crystal oscillator circuit, RS232 port, ICSP/ICD port, 4 relay output, 4 optocoupler isolated inputs...
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According to current legislation in many countries, vintage cars must also be fitted with a fog lamp at the rear. In modern cars, there is a bit of circui....
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THis Wien bridge oscillator is very simple and as every wien oscillator has low distorsion and the resonance frequency can be easily adjusted. This frequen....
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The following circuit shows about Bedside Lamp Timer Circuit Diagram. This circuit based on the CD4060 IC. Features: LED illuminates for around 25 ....
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Here is a simple but effective intercom circuit that is based fully on transistors. The circuit is based on a three stage RC coupled amplifier. When the pushbutton S2 is pressed, the amplifier circuit wired around T1 & T2 becomes an astable multivibrator and....
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This power supply uses two VN400A 400 Volts MOSFETs in a half-bridge power switch configuration. Each output consists of +5V at 20 A and 15 V at 1 A. Three-terminal regulators are used for the low-currents outputs, either 12 Volts or 15 Volts can be made....
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A two transistor electronic siren breadboard circuit that produces an audible rising pitch on a loudspeaker. Tutorial and circuit for beginners in electronics....
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Here`s a design circuit that is intended for carrying out harmless experiments with high-voltage pulses and functions in a similar way as an electrified fence generator. The p. r. f. (pulse repetition frequency) is determined by the time constant of network....
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This FET audio mixer is an example of FET`s versatility. FETs are originally designed for high frequency applications but they can be used for audio frequencies and in fact they perform excellently in this area. The number of inputs that can be connected to....
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This Do-it-yourself lightning detector ambit can be a abnormally acute changeless electricity detector which can accumulation an aboriginal admonishing of abutting storms from inter-cloud acquittal appropriately above-mentioned to an earth-to-sky....
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The following circuit shows about A933 Transistor Telephone Listening Circuit Diagram. Features: can be tuned from 88 to about 94Mhz, simple ....
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Laptops today are the what is called notebook computers, which now is becoming popular. Laptops can be brought into the bag making it suitable for business trips. And even as the home entertainment center laptop is more convenient, because it takes a....
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A cellphone operated robot and i`m stuck with Atmega32A microcontroller programming. As software you can use then AVR STUDIO 4. Unter the Tools you can find the Menu "Programm theAVR" Chose there your used Programmer and you can setup and Programm your....
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The circuit composition determines that the LED adopts anodic Nixie tube. It can use LQ5101BS general luminous diode and the driving triode can use 2SA1015 or 2SC1815 types which is easy to gain. Of cause, the triode can also use low-power triode such as....
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Mark IIc+ has a reputation of being one of the most sought after amps today. Only 1500 of them were made back in the 80 ²s and these days they go for up to 4000-5000$ a piece. One of the players that made this amp famous is John Petrucci. Being a Petrucci....
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AF modulating signal is applied to gates of matched FETs in push-pull through T1 having accurately center-tapped secondary, and RF carrier is applied to sources in parallel through C3. Carrier is canceled in output circuit, leaving two sidebands. R3 is....
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Electronics Tutorial about Quartz Crystal Oscillator including Harmonic, Overtone, Pierce Oscillator and Crystal Quartz Oscillator Circuits....
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You need this schematics. Go to THIS page and you will find a good pre-amp and power amplifier for your guitar include the complete explanation of its works, and how to build the box. ..
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This circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles, ...
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In the figure is the bilateral band modem circuit composed of NE561B. The loading frequency of the input modulating signal is f0=1MHz. When the AM modulation signal is added on the input terminal of the multiplier, it is also added on the phase detection....
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The K8000 DAC High Power Amplifier is an electronic amplifier whose output can be regulated between 0 and 9 V with an output current of up to 9 Amp?res....
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This glowing Halloween ghost is available as a kit from the tuxgraphics online shop. It can glow friendly or it can produces scary flashes. You can choose your own face and make a friendly ghost or a scary moster. We wrap a very bright white LED in bubble....
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You could really use any phone for this project, so don`t worry if you can`t get or don`t want the same model as mine. If you do get an antique bakelite phone, here are some basic steps for restoration. Clean your phone with a rag dampened in one of those....
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The schematic is shown in figure 10. The circuit can be hardwire onto a breadboard or you can purchase a pc board, see figure 11. The LCD display used is a 2 line by 16 character display. You can use an LCD module with a Hitachi 44780 controller or....
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Triode for alternating current,TRIAC, is an electronic component that can control power in two direction in an AC circuit. The figure (a) shows the block...
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Any microcontroller in the ATmegaXX8 family should work, though if you`re going to go to the trouble of building this, spending a few tens of cents on extra flash memory seems like a prudent idea. A DIP socket is, strictly speaking, optional, but not having....
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This beeper circuit will generate an car-splitting 110dB from 9V. The setup uses a single 74C14 (CD40106B) CMOS hex inverting Schmitt-trigger IC, which must be used with a piezoelectric device with a feedback terminal. The feedback terminal is attached to a....
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Here is a very simple project of controlling a small DC-motor (taken from an old personal cassette player) with ATmega8. The ATmega8 is having three PWM channels, out of which two are used here. PWM waveforms are fed to MOSFET (RFD3055) H-bridge. Here,....
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This subwoofer active filter circuit is a 24 dB octave filter with a Bessel character and cutoff frequency of 200 Hz. So, if you are interested in experimenting with audio circuits in subwoofer range, this circuit is for you. In subwoofer range, all audio....
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The first problem is with the 16Mhz xtal the thing doesn`t even start to oscillate. But that`s a secondary problem. If I replace 16MHz xtal with a 11MHz one (or less) the oscillator starts. I can see with the `scope that I have a nice 11Mhz sinusoidal....
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For longest life, we recommend you run them at 20-25 milliamps (ma). HOWEVER, in our LED flashlight conversions (and many commercial LED flashlights), the LEDs are run at 50-60ma, twice the rated current. One of our test LEDs ran at 98ma for over 200 hours....
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Without any USB to phone battery charger circuit we can charging phone battery using port on USB computer, but it will quickly damage the phone battery, and the battery will bulge. Because the voltage which was issued on usb is 5 volts, while the....
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This is a circuit for RF (radio frequency) transmitter experiment, watt meter is useful for optimizing the transmitter circuit. A simple RF watt meter circuit is shown in the schematic diagram below. Because circuit is not frequency sensitive, calibration is....
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The reflected IR signal detected by the photo diode is fed to a signal conditioning circuit that filters the unwanted signals and boost the desired pu....
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Ever accidentally left your front door ajar and had a pet escape? Here is a smart solution to this problem. The circuit is fairly simple but a great exampl...
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A standard 12-volt auto electrical system can be considered to be a powerful but unreliable source of low-voltage DC current. Some of the features any mobile PC installation should provide include: Automotive systems must be designed to strict electrical....
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RF Wireless Data Transfer communication Circuit diagram.we implemented a wireless communication interface one point to another by means of RF technology...
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A logarithmic resistor ladder is an electronic circuit composed of a series of resistors and switches, designed to create an attenuation from an input to an output signal, where the logarithm of the attenuation ratio is proportional to a digital code word....
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The EM4294 is an analogue front end for high secure 13. 56MHz RFID reader systems. The reader integrates the crypto algorithm of the EM4035 transponder IC associated with 4 secret keys. Each secret key is 96 bit length and it gives access to the EM4035 tag....
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Here`s a Regenerative Receiver project that I designed for the 80 meter Amateur band, but which can also be used in a wider-tuning configuration that covers approximately 3 MHz to 10 MHz, for Shortwave (World Band) listeners. Built in the same style as my....
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This circuit built from the ubiquitous LMC555 timer IC. Are typically used in laboratory power supplies and other test and measurement equipment ....
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