New Circuits Page 60
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This week we were in a Southern mood in anticipation of Spring Break, so we initially decided to build a LassoBot. This robot throws a lasso in a circle until an object in the lasso`s path is grabbed on to. At that point, LassoBot reels itself closer to the....
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Where can you obtain a 12AX7 tube, you ask These tubes are very popular for use in the "preamplifier" stages of many professional electric guitar amplifiers. Go to any good music store and you will find them available for a modest price ($12 US or less). A....
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This circuit shows a Car Radio Audio Amplifier Datasheet With TDA2003. This TDA 2003 datasheet has electrical characteristic, schematic wiring ....
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Using a similar circuit to the LF block converter, I`ve made a Schumann Resonance Converter that moves the near-DC signals up to around 2 kHz for an ordinary soundcard. Here`s the maiden run plot: It seems to work! The fuzzy lines below 30 Hz are due to the....
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This audio amplifier circuit is designed to deliver 2W per channel continuous into 8 © loads. The LM1877 is designed to operate with a low number of external components, and still provide flexibility for use in stereo phonographs, tape recorders and AM-FM....
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A schematic diagram of a touch switch circuit is shown below. This circuit consist of timer, one shoot multivibrator and touch terminal. As timer, this circuit uses 555 timer which is connected to one-shot multivibrator. The touch terminal is used to trigger....
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This timer was designed mainly to switch off a portable radio after some time: in this way, one can fall asleep on the sand or on a hammock, resting assured that the receiver will switch off automatically after some time, saving battery costs. R1 and C1....
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This is a simple high voltage inverter circuit. It is uses NPN transistor type 2N3055. This circuit used to invert low voltage to high voltage. Besides that,....
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A relatively simple attachment to my Canon SLR to create a motion activated camera using Arduino. A lot of this was based on and inspired by the intervalometer project at The Honey Jar. I made some changes to his circuit to use a 4N35 optocoupler instead of....
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Have you ever wanted to make a line following robot but the infrared sensors were too expensive for you Do you want to upgrade the robot in my other instructable Also, if you`re from the UK and have a maplin store near you, you`ll be able to get some IR....
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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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Wireless headphone transmitter receiver now widely available in the market with a variety of pricing options with a reliable technical specification for a variety of allocations which include wireless headphones for tv or tv headphones, wireless earbuds,....
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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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In contrast, a piezoelectric sounder (self drive type) consists of only a piezoelectric diaphragm with a feedback electrode. It is used in combination with an external drive circuit. The drive circuit for both of the above is a simple circuit consisting of....
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A siren circuit with diagram, which produces a strong,high power siren or alarm sound using complimentary transistor pairs BC 557 and BC 337,arranged as oscillator....
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The circuit shown below can be used for measuring frequency or Hz. The IC is very simple to make andutilizesjust a single IC 4033 and a common cathode display as the mainingredients. If higher frequencies in the the order of two or threedigitsare required to....
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Discrete Class AB Transistor Audio Power Amplifier Circuit Diagram This is a class AB transistor power amplifier. It is a simple amplifier to....
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Audio frequency-shift keying (AFSK) is a modulation technique by which digital data is represented by changes in the frequency (pitch) of an audio tone, yielding an encoded signal suitable for transmission via radio or telephone. Normally, the transmitted....
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TC9402 The TC9400 TC9401 TC9402 are low-cost Voltage-to-Fre- quency (V/F) converters, utilizing low-power CMOS technology. The converters accept a variable Analog input signal and generate an output pulse train, whose frequency is linearly proportional to....
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This page describes a dual axis stepper motor controller design and printed circuit board for an equatorial mount. Much thanks goes to Bill Prewitt for his help in the design of this web page. Download encapsulated postscript file of the artwork. This file....
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phase-shift oscillator. An oscillator in which a network having a phase shift o....
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The circuit was designed to create a frequency convert with the use of a crystal oscillator for the conversion of 10 MHz to 1 MHz. 7404 a hex inverter u....
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The different between these two IC`s. A Microcontroller is a specialized form of Microprocessor that is created to be self-sufficient and cost-effective, where a Microprocessor is typically designed to be general purpose use like in a Personal Computer (PC).....
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The setting of delay timing of program will depend on CPU speed. You can use the timing delay on C+ library so you can set the standard timing at any computer but the minimun time delay can achieved was 1ms. It can be improved at less than milisecond by....
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With the high-speed development of social economy, the human demand for electric energy is larger and larger. Under non-renewable, situations in short day by day of energy such as the fossil energy, etc. , the increasingly many country realizes the power....
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Miniature guitar amp featuring a class AB pentode output section using 5902 subminiature tubes....
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Today a close friend visits tell want Dry cell lead acid battery charger circuit 12V 7. 5hA sizes. In model to are simple and economize with. I then advise this circuit try build see. By use the integrated circuit voltage regulator the number is highly....
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Here are design data for a 3TF7 replacement. Design was based upon the information found in The Ballast Tube Handbook` by Jacobi and on the descriptive field of the R-390x part list: Actually, according to the voltage charts of R-390x receivers, the 3TF7....
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It is often necessary to arrange an voltage regulator IC to give a higher output voltage than that set by the regulator alone. One method to achieve this is by connecting the common terminal to the mid-point of a potential divider but the problem with this....
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Here the simple traffic light controller which is could be used to educate kids rudiments of traffic light guidelines. The circuit utilizes easily available electronic parts. It generally consists of rectifier diodes (1N4001), a 5V regulator 7805, two timers....
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The following circuit shows about Petrol Gas Switch Sensor Circuit Diagram For A Pajero. Features: simple circuit, using LM334 IC, automatically ....
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With regard to the System Monitor feature presented in this article, Avalon Microelectronics used this feature in two Virtex-5 FPGAs (XC5VLX330T) in their development with great success. They had an unusual problem on their development board, which shut down....
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This page contains material related to the technical issues on taking meteor counts thus monitoring the meteor influx using VHF radio receivers. It is not meant to be a comprehensive how-to guide, but tries to fill some gaps and give second opinions on....
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The 10k resistors in question are R15, 17, 18, and 19 (R16 is somewhere else). Their purpose is to separate the input channels, because otherwise turning the volume control for one channel down to zero would also connect the output signal to ground, cutting....
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Prior to the advent of FET-input digital multimeters (DMMs), the vacuum tube voltmeter (VTVM) was the primary instrument for use when high input impedance was required. For the newcomer to electrical measurements, high input impedance for the measuring....
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This is a Basic Cadmium Sulfide (Cds) Photocell Detector circuit. In this circuit, when the light falling on the photocell (PC 1) is blocked, its resistance will increase and the voltage across PC 1 will rise. When the voltage rises above 1/2 of the supply....
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Description: AT89S52 For Bell Timer Circuit Diagram. Features: 7segment display is replaced with LCD display. DS1307, uses AT89S52 microcontroller and I2C ....
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The number 83 rectifier tube is a mercury vapor type rectifier that is designed to operate on a vertical plane with the base pins pointing towards the center of the planet. It is supposed to be transported and stored with the pins pointing toward the center....
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This automatic NiCd charger for 9V NiCd batteries is using 555 timer properties and is very easy to build. Why is an automatic 9 volts NiCd battery charger? Because you can leave the battery for charging as much as you like: it will be always completely....
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This circuit uses a complementary pair comprising npn metallic transistor T1 (BC109) and pnp germanium transistor T2 (AC188) to detect heat (due to outbre....
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Burned out some resistors on the circuit board of my Roland KC-300 amp and they are so black that I can`t tell what they are. What kind of resistor is R82, R83, R85, R92, and R93 If R92 and 93 continue to get really hot. you may have something pulling too....
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Using the LT3694 monolithic, current mode DC DC converter can be designed a very simple step down converter that will can support a maximum output current of 2. 6A. LT3694 switching step-down converter (capable of generating up to 2. 6A at its output) has....
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Most thefts happen after midnight hours when people enter the second phase of sleep called ‘paradoxical sleep. Here is an energy-saving circuit that caus....
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Learn implementing I2C on 8051 PIC and AVR microcontrollers. Here you will find codes and examples for using I2C library....
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For many years, the Q meter has been an essential piece of equipment for laboratories engaged in the testing of radio frequency circuits. In modem laboratories, the Q meter has been largely replaced by more exotic (and more expensive) impedance measuring....
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The connection point for the positive terminal of the 9V battery is displayed as a circle at the end of a line with the label "+9V". This is just another way of showing where to apply power to the circuit. The 0V or "GND" of the circuit is shown as an....
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The following circuit shows about BC 109C For Tone Control Circuit Diagram. Features: all audio frequencies are attenuated,high input impedance, ....
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Attenuation of ultrasonic pulses boomed through test piece reveals presence and extent of internal defects, such as nonbonds between aluminum cladding and uranium core. Test piece and transducers are submerged in water to provide good coupling for 900-kc....
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As shown in figure, the proximity switch circuit is composed of HMC1001, operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator. When you move magnet with length being 6mm~12mm to HMC1001 in a....
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Two transistor oscillator generates pulses at about 500 Hz for step-up by 300-mA filament transformer T1 (Radio Shack 273-1384) to charge storage capacitors C2 and C3, which are 250-V electrolytics. Simultaneously, C4 is charged through R2. After allowing....
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A typical, low cost, FSK Modulator TA0038 is implemented by injecting the modulation voltage into the phase lock loop of the Carrier synthesizer. This is done in two ways, by summing the modulation voltage and the loop error voltage together and applying....
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A project of a morning / sunrise alarm circuit which will produce a beep-beep alarm sound and flashes an LED according to the sunlight....
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The following is a series of simple TV transmitter using negative using sound modulation and PAL video modulation. This is suitable for countries using TV systems B and G. Inductor L1 can be made by wire email (24SWG) 4 convolution with 6mm diameter and T1....
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With the advent of modern ICs, sophisticated circuits today no longer have to be complex and lengthy. The chips themselves carry most of the complex circuitry built-in and single handedly perform the desired function. Take for example the present battery....
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My current vehicle, a Pajero, was modified for dual fuel - ie, petrol and gas. However, it`s necessary to run the vehicle on petrol at regular intervals to stop the injectors from clogging up. This simple circuit allows the vehicle to be started using petrol....
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This cable tv amplifier circuit is a rf amplifier designed to be quickly installed between two coaxial cables. Both input and output impedances are compatible with 75 © cables. The main amplifier si T1 transistor, T2 is working as an emitter follower. The....
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The count advances as the clock input becomes high (on the rising-edge). Each output Q0-Q9 goes high in turn as counting advances. For some functions (such as flash sequences) outputs may be combined using diodes. The reset input should be low (0V) for....
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The Philadelphia, PA based Maker/hacker group Hive76 developed a tiny serial terminal using a TI Launchpad and an HD44780 LCD. The circuit diagram and code libraries are available for download. Some useful work that can be incorporated into larger projects.....
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The simple mixer schematic is built on common base principle, where input voltages are transformed in alternative currents wich are summed to form the alte...
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Interfacing hex keypad to 8051. AT89S51 is the microcontroller. Circuit diagram and assembly language program. Testing video also provided....
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This motor speed controller uses a single IC LM1014 to control the speed of a DC motor. It senses the increase in the motor-current when the rotation of th....
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This RS-232 RS-232 /a> to RS-485 protocol converter uses two products for a complete operational system. The circuit will comply with all EIA and ITU specifications for RS-232 RS-232 /a> to RS-485 RS422 conversion. This is a rugged design that will handle....
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A simple battery charger based on SCR is shown here. Here the SCR rectifies the AC mains voltage to charge the battery. When the battery connected to the charger gets discharged the battery voltage gets dropped. This inhibits the forward biasing voltage from....
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This Digital Alarm Speedometer Circuit. It allows us to appraise the acceleration of any article moving, abnormally cars and added vehicles. The acceleration is affected in kilometers per hour (KPH). Its affectation has three digits. This alarm works with....
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If you replace the resistor/transistor with an n-ch power mosfet, and replace the relay/prot diode with a light bulb, you`ll have a simpler circuit that replicates the circuit you posted (assuming it drives a light bulb with one end connected to +12). If the....
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Find Permanent Magnet DC Generator, Magnetic Motor Generator and more at Magneticgenerator.info. Get the best of Free Energy Magnet Motor or Cash Advance, browse our section on Debt Consolidation or learn about Insurance. Magneticgenerator.info is the site....
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I accept acclimated a brace of BC548 transistors in this circuit. Although not carefully RF transistors, they still accord acceptable results. I accept acclimated an ECM Mic admit from Maplin Electronics, adjustment cipher FS43W. It is a two terminal ECM,....
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First of all let me remind you that this circuit is a very dangerous one. The output voltage of this circuit is in Kilo volts and it can seriously injure you or kill you. Try this circuit only if you have enough experience dealing with high voltages. I have....
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The FT8U232AM requires a small number of external components to produce a device that converts USB to TTL level RS232 signals. All you need to add is a TTL to RS232 converter to provide the 12V RS232 logic levels. The FT8U232AM and supporting components is....
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Design a circuit in which a microcontroller produces a signal and then using an amplifier drives an 8ohm speaker. I`ve so far used LM386, but it cannot go above 1W, which turned out to be insufficient. Besides that, I wish to add an (second order) anti....
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Oh, one thing I forgot to mention about the battery ""circuit"" I attempted to salvage the circuit and put it inline with the new battery,....
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This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 dB. Two Op-amps provide the necessary circuit gain for sounds picked-up by a miniature electret....
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3130 CMOS opamp gives required high input impedance for pH probe at low cost. Output of probe, ranging from positive generated DC voltage for low pH to 0 V for pH 7 and negative voltages for high pH values, is amplified in circuit that provides gain....
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The chips that are termed "working well" yield about 300 mV under the beam from a laser pointer and between 40 to 80 mV under the LED light. Voltages around 100 mV were observed in a sunlit room and about 10 mV under fluorescent lighting. Our simulations (....
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Anyone who is interested in home construction will at some time or other have the need to measure the inductance of small coils. This can be a difficult problem, as commercially made equipment of sufficient accuracy is often far too expensive for occasional....
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I would like to make a portable (battery powered) mic preamp based on the IC THAT1510. I am attaching the basic preamp circuit given in the THAT1510....
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The above circuit, whilst it works, is GREATLY INFERIOR to Lev`s Oscillator for Theremin use. The above simulation waveforms - Red Sine = voltage on L1:A, Black Sine = Voltage on Q1:D, Blue square wave is current through L1:B and Q1 (10mA, 5mA average) It....
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This voltage-tuned Clapp oscillator uses a varactor diode to set its operating frequency. D1 is an NTE614. L1 is about 7/ ’ (MHz) microhenries. With the circuit shown, the frequency range is about 6 to 15 MHz. ..
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Temperature-indicator and temperature-based products have generated wide interest. There are numerous applications for such devices with many possible solutions, each with its own advantages and disadvantages. This idea discusses a sensor interface that....
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This easy as well as cheap but effective device is mainly intended for your ease to leave your fish autofed. You need no longer worry your fish would starve as this autofeeder would replace your job. This autofeeder device will expell pellets byquantityas....
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An EEPROM is kinds of novalatile memory, that means it is used for storing digital data permanently without any power suply. EEPROM stands for Electrically Erasable Programmable Read Only Memory. The advantage of these kind of ROMs is that they can be erased....
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This two-stage audio preamplifier is intended for use with high-fidelity magnetic phonograph pickups. The overall gain of the circuit is about 150. The circuit is from the RCA tube receiving manual and meant for use with the famous RCA 7025 twin triode.....