New Circuits Page 38
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We can use ISL97676 as a LED driver that drives 6 channels of LED current for TFT-Display. The ISL97676 is used to drive 6 channels of LED to support 78 LEDs from 4.5V to 26V or 48 LEDs from a boost supply of 2.7V to 26V and a separate 5V bias supply on the....
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This circuit is a series-FET Voltmeter FETVM. This FETVM to replace VTVM function while at the same time line used to clean the appliance cord. In addition, the rate of drift is far superior to vacuum tube circuit allows full-scale range of 0.5 volts is the....
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This circuit designs for modify power supply input 12V from battery or the other. Have the level voltage be down be left 9V be stable or , 9V at 2 Amp....
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This is a phantom-powered FET preamplifier built into a 1/4" guitar cable, similar to the one on the Tillman site. There are only a couple of parts to the amplifier, so the difficulty was being able to trim and solder component leads to fit within the space....
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This circuit was constructed to control the pump in a garden pond, so that it automatically turns on at dawn and off again at dusk. Not only does this mea....
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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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The circuit below responds to sound pressure levels from about 60 to 70 dB. The sound is picked up by an 8 ohm speaker, amplified by a transistor stage and one LM324 op-amp section..
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I`m using H-bridge with IRF740 (MOSFET) to convert 315VDC to 230VAC. But the upper mosfets are frequently get damage within few seconds. I can`t find....
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This is a schematic of a cable TV signal booster amplifier circuit which can be used to amplify or boost the signal of cable TV system. Use 75 Ohm coaxial cables at the input and output of the circuit and fit the circuit in a metal case. The bandwidth of the....
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Analog Geiger Counters are useful for detecting radioactivity and performing nuclear experiments. The GCK-01 model has numerous customizable options and comes as a ready to build kit. These Geiger Counters primary indicators are an audio click and an LED....
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Amplify a MG811 CO2 sensor to a range readable by an ATMEGA2560 (0-5v). I have other analog sensors, so do not want to change ref voltage on Atmega. I have found a module that scales the signal and want to replicate the circuit from the documentation, but....
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Here is simple function generator. Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in...
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Do you long for a beach holiday on a tropical island, but you don t have the necessary wherewithal? We ve got just the answer: build the i-TRIXX surf simulator, put on your headphones, and dream yourself away from this dreary realm. Let the rhythmic rush of....
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Temperature controlled pulse-width-modulator (PWM) boost converter circuit diagram is shown in the following figure. The boost converter may provide temperature-controlled operation of 12V fan from 5V supply..
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The FDK Multi-750e was launched in the UK in 1981. A 2m ham radio multimode tranceiver, at a good price, and with a matching 70cm transvertor controlled from the front panel. There are still a good number around, but many have stopped working because of a....
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The photo depicts a completed (bread-barded) locked anti-phase motor controller using general purpose transistors, which allows you to control small DC motors for robotics applications. The big picture problem is that a normal DC motor controller does not....
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Without any dedicated buck converter/white LED driver IC, you can safely drive many standard Hi-efficieny white LED modules using the battery power availab....
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It provides a means of temporarily silencing a battery-powered smoke detector after you`ve burnt the toast, scorched the baked beans or whatever! Unlike the earlier design, this more sophisticated version does not cause strange chirps and whistles to emanate....
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This project generates 350V DC and stores the voltage in a large electrolytic. This voltage will not kill you, but will deliver a nasty SHOCK! For this reason, the project has a great benefit. It will teach you to work very carefully on equipment with high....
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Potentially, headphone listening can be technically superior since room reflections are eliminated and the intimate contact between transducer and ear mean that only tiny amounts of power are required. The small power requirement means that transducers can....
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Automatic headlight dimmer circuit diagram for your car`s headlight, keep you safe with maximum bright for farthest visibility, but will automatically switch ...
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This AM/FM antenna booster circuit amplify the broadband signal from antenna. This antenna booster should work fro FM, AM, and SW receivers. Here is the....
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I used alligator clips to make the circuit and have it working. Then worked on the code and especially on the blinking section to make the LEDs look like they are blinking randomly and not in any order. I used the values read and send by the sensor to....
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To get a good voltage swing, the value of R1 must be carefully chosen. If Rsensor = a when no light falls on it and Rsensor = b when light falls on it. The difference in the two potentials is: in presence of light and a very large resistance in absence of....
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The Proximity Sensor circuit can be seen below. Three red boxes show the additions to the circuit that we already built in Part 2: Motor Control. The new parts used and seen in the schematic below are the GP2Y0A21YK IR Sensor, Headphone Speaker and some....
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This is the project home page of the SmaTrig 2. 1, the improved version of the the SmaTrig 2. On this site you will find complete instructions how to use and build the versatile and compact (27 gram) 15-in-1 camera trigger SmaTrig 2. 1. Everything needed to....
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The ubiquitous 555 has yet another airing with this bistable using a simple push-button to provide a push-on, push-off action. It uses the same principle of the stored charge in a capacitor taking a Schmitt trigger through its dead-band. Whereas the Schmitt....
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The Motion Sensor Switch circuit is a motion sensor controlled automatic water sprinkler but you can easily add an alarm/light function too. Before beginni...
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This simple counter can be used to count pulses, as the basis for a customer counter (like you see at the doors of some stores), or for anything else that may be counted. The circuit accepts any TTL compatible logic signal, and can be expanded easily ..
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This IC chip was designed specifically for use in power boosting applications in automobiles. It is self protecting against short circuits and thermal problems. In the bridge configuration shown it will deliver 20 watts of power into a 2 ohm speaker....
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The circuit in the schematic below is an improved piece of generator electronics. This is an unregulated switcher. Its function is to make the instrument as loud as possible while keeping the CPU running as long as possible. It transfers electrical energy....
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555 Timer With Audio Alarm Circuit Here is a very simple circuit for electronic timer with audio alarm. With the help of this circuit, audio....
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Sip-and-Puff (SNP) controllers are nothing new - you`ve probably seen one in action yourself. SNPs are often seen on electric wheelchairs and allow individuals who can`t use their hands to control their wheelchairs (or whatever else) by either "sipping"....
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To change the frequency of the output by the dividing ratio of the comparison frequency in the 10KHz unit, the dividing ratio is fixing on 1024 at the circuit this time. Because the 144-MHz bandwidth of the amateur radio is 2MHz(144. 0MHz to 146. 0MHz) in....
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This circuit have a very stable and simple FM transmitter circuit. This transmitter can attain a range of around 200 meters if have a matching ....
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The Tube Screamer series of distortion/overdrive boxes from Ibanez has a reputation that has led them to pass into musical urban myth. Helped along with Stevie Ray`s use of them, the TS 808 and TS 9 have been sought after and traded up to astronomical....
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Schematic Diagram is a layout of symbols and and connection of every electronic components circuit where serve as a guide on how the circuit function or work. Learn how to read it. At first you might think that it is hard to do so, You are not going to be an....
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The super dimmer it is certainly better than the normal dimmer you are using now. It would be better, however, to try to prove it. Let`s see how it works....
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The SL561 used in this circuit is a high-gain low-noise preamplifier designed for audio/video applications at frequencies up to 6 MHz. Figure 2-6B shows gain versus frequency for various values of C1, and Fig. 2-6C shows gain versus various values of RSET.....
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A basic circuit of the transistor UHF radio transmitter with surface acoustic wave resonator (SAW), and the SAW is used as a positive feedback element connected between the transistor VT base and LC network in parallel. Figure (b) shows another basic....
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LCD initializations in 8051 C programming words What is the logic behind the serial communication As in, how long should the SIG send out pulses and what should the delay be These statements are used to tell the compiler that a 16X2 LCD is connected to the....
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The module provide a pre wired multiplex of 4-digit common anode LED, that`s great. See the soldering pad of these signal in the 1st picture below. I thought, my friend gave me the AT90S2313 chip, and with a simple homemade ISP cableand a free software AVR....
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Continuing the studies about directly coupled multiple resonance networks operated as Tesla coil like devices, I built a 6th-order system, that is equivalent to a " Tesla magnifier ", but without a transformer. The schematic diagram is shown below: This....
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Here is an efficient 4-stage stabilised power supply unit for testing electronic circuits. It provides well regulated and stabilised output, which is essential for most electronic circuits to give proper results. The circuit provides an audio-visual....
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This very simple circuit uses a transformer, two diodes, a capacitor and an ammeter. To charge a battery just connect the + and terminals of the circuit to the corresponding terminals of the battery. When the battery is not charged, the ammeter reading shows....
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This 70MHz rf power amplifier circuit uses the SD1143 transistor which provides a gain of about 14dB in this design. It uses the fact that a 175MHz device....
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This CFL lighting kit is available from a reputed brand alfa, which is known for it`s circuits in applications of inverter like products. We get a good stable circuit from them. The below kit is for lighting a PL of 9Watt, 11Watt or a CFL of upto 20 watt (of....
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The circuit drawn pertains to a regular industrial UPS (Uninterruptible Power Supply), which shows how the batteries take control during an outage in elec....
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This design note presents a simple yet feature loaded 16 watt output, universal AC input adapter power supply for modems, hubs or similar applications. The circuit is a discontinuous mode (DCM) flyback converter topology designed around ON Semiconductor`s....
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A TRIAC driver board for use with my reflow toaster oven project, which means mains voltages. IPC-2221 says that U. S. mains voltages require 0. 4mm clearance if coated with solder mask. A few questions: Can I run overlapping tracks on both sides of the....
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This automotive battery charger project is designed to charge 12V electrolyte lead acid batteries. ....
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This project, based on an article published in the February 2008 edition of Radcom (the magazine of the Radio Society of Great Britain) is for a meter with a 50 ohm input impedance for measuring very small RF powers. Many RF power meters become inaccurate at....
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The particular circuit combines enough operations, as Smooth departure of benefit of AC line of network, with delay 1sec, to the transformers of power supply of amplifier, via the RL1 and the resistance Rx. (see block diagram). [ 2 ] Delay of connection of....
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This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is....
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This 4-channel commutator uses the 2N4091 to achieve low channel ON resistance (k30X) and low OFF current leakage. The DM7800 voltage translator is a monolithic device which provides from a10V to b20V gate drive to the JFETs while at the same time providing....
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Details of rigging an Evinrude E-TEC engine, particularly with ICON gauges and ICON controls, and with a special emphasis of NMEA-2000 details and TRIM circuit details...
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This was a quick experimental prototype I put together based on an elegantly simple design by Doug Forbes, which uses common vacuum tubes. (Since Mr. Forbes`s original site is no longer available I have taken the liberty of reproducing his schematic and text....
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This circuit regulates a DC power output. It has a very wide application range. It can be used to control the speed of a motor, a pump, a toy train, the brightness of a LED or lamp, etc. Practically, it can be used in any application that uses a regulated DC....
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The two most common motor-control methods are: DC Chopper control and Phase Angle control. This article explores the differences between the two methods, identifying some of the key trade-offs that can be useful for motor-control designers when determining....
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By selecting "ON" mode the the SilverPro© start the process of generating the colloidal using the your presetSetup parameters. The unit allways recall the last used presets. During it`s operation the display scrolls between the total minutes elapsed, the....
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Here`s schematics for infared remotes. This remote transmits a tone using an infared LED. This tone is decoded by the receiver. Since the receiver only switches when it "hears" the tone, there are no accidental activations. ..
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It looks as if they are highly prone to harmonics meaning in this case, that if the resonator is 455KHz, it will also allow 910Hz and 1820KHz and 3. 640MHz which seems to be dominant and on up. But the frequency around 3MHz seems to be prevalent and one or....
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This is the special circuit design of power supply failure alarm. The vast majority of the power supply failure alarm / indicator circuits require a independent power supply for themselves. However the alarm circuit introduced right here re....
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I would need help on converting high frequency to low frequency and vise versa. Currently I am doing a project on sensor, below is the schematic....
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This white LED Driver circuit project is based on the NCP5680 high efficiency white LED Driver ic. NCP5680 supports double power flash LED and torch operation. The built-in DC/DC converter is based on a high efficient charge pump structure with 1X, 1. 5X and....
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A circuit that allows you to control a relay in response to sound from a non-amplified sound source (computer, CD player, or my Digital Sound Recorder board). This circuit accepts audio input from any non-amplified sound source and when the volume reaches a....
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This was a final project for an optics class EE 134 at Stanford. It was an open-ended project to make a fully functioning laser microphone the class was geared to demonstrate optics and photonics in the lab, not necessarily electrical schematics. There are....
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Using PC`s parallel port is a convenient way to control a stepper motor. For unipolar stepper motors, up to two motors can be controlled with the 8bit data line. The standard way of connecting a unipolar stepper motor to the parallel port is to use a....
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This circuit is the opposite of Repeating Timer No.3. Its operation can be limited to the hours of darkness. Again - the variable resistor (preset) lets you choose the level of darkness at which the timer will begin to function....
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A guitar to MIDI interface was designed that was intended to serve as an interface between guitar playing and MIDI control of external hardware and software. This document describes the details of the design, experimentation, implementation and final outcome....
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Uses surface-barrier transistors in arrangement wherein pattern of four on stages is stepped along ring, per mining maximum number of stages in ring lo be much higher than in conventional rings. -W. Carlson, Ring Counter has Increased Count Capacity,....
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An article on How to make an inverter using simple 40 Watts inverter circuit diagram and schematics. This is a 12 volts to 220 Volts inverter using CD4047 IC....
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Three devices in a quad Schmitt Trigger and a Flip-Flop make a simple but sensitive proximity sensor..
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2 Tone Door Bell here published is verified project produce ding-dong sound circuit diagram of 2-tone door bell with description.various door bell and alarm project ...