Popular Circuits Page 179
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During the distribution of the video some losses and distortion might occur to decrease the quality of the video, but don`t worry here is a simple electronics project to overcome the problem, This video distribution amplifier enables four video recorder or....
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Say you have a Vsource Resistor and Inductor all nicely in a loop. You let the voltage source run until everything reaches a happy steady state. The Inductor should have energy (1/2)L*(V2/R2). Now. what happens if I cut the wire Where does the energy go..
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Here is a simple circuit which can be used for decoration purposes or as an indicator. Flashing or dancing speed of LEDs can be adjusted and various dancing patterns of lights can be formed. The circuit consists of two astable multivibrators. One....
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Balance indicator for power supply show if a symmetric power supply is really symmetric or not. With two comparator pairs from a LM339N quad comparator we....
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Off timer with alarm is a simple project used to indicate time off employs 4 transistor,.circuit diagram with parts list and description of off timer with alarm.various alarm project...
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A flame sensor (UV TRON) made by HAMAMATSU PHOTONICS, Japan, is an ultraviolet light detector. It has a narrow spectral sensitivity of 185 nm to 260 nm, being completely insensitive to visible and infrared light. Unlike semiconductor detectors, it does not....
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This figure illustrates a way in which a momentary 10-kV voltage pulse can be generated to initiate the plasma discharge across the laser tube. A Diode voltage-multiplier circuit is connected in series with the main supply and obtains its input power across....
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Optimize the layout of the MAX16974/MAX16975/MAX16976 high-performance DC-DC converters, standard buck controllers designed for automotive applications....
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Bridge sensor output signal precision differential instrumentation amplifier with adjustable gain IC1 amplified send IS0100, IC1s gain is determined by the external resistor Rc..
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This circuit disables the air conditioner compressor when additional engine power is required. It does so by monitoring the engine vacuum at the intake manifold. Ifthe vacuum drops to 40% of its normal level, the compressor clutch is disabled, removing the....
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A single chip metal detecor with a range of a few inches. This is useful for decting nails or screws in walls and floors, or for locating buried mains cable. The heart of the circuit is a single IC the CS209A made by Cherry Semiconductor. The detector, is a....
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The following post illustrates a simple light toggled/operated remote control circuit, which can be activated by an ordinary flashlight or more effectively through a laser beam unit (key chain type). The LDR is connected across the base of thetransistor and....
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Here is a schematic of FM, AM/MW and SW antenna amplifier circuit or we can also say it antenna preamplifier circuit which can be used to increase the faint signals of FM, AM/MW & SW bands. The circuit is very simple and easy to build using only one....
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If you switch gears over 5k during a solar eclipse you`ll have to have your nut bearings revalved. There is a lot that goes into it. Same goes for making a sammich. They`re Fedders Inverter units. 12K & 18K. I understand they`re tricky to get the charge....
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I built a PCB for a simple switching power supply, originally designed by Keith Payea of the SRS. It uses an LM393, a P-channel power MOSFET, and darn little else. Since its frequency varies based on load (and nearly everything else imaginable), you can use....
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This 1 square meter antenna has radiation resistance of about 10 nanohoms, making the 0.4 Ohm resistance (including skin effect, which about doubled the resistance from the DC value) the dominant loss in the antenna. The lower the resistance, the more....
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The circuit described in this article is a MOSFET follower for driving headphones. FET followers can supply high current, but have a voltage gain of slightly less than unity. They are most suitable in applications where the input signal does not require....
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The target of this project was the design of a small portable mixer supplied by a 9V PP3 battery, keeping high quality performance. The mixer is formed assembling three main modules that can be varied in number and/or disposition to suit everyone needs. The....
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ICs with on-board oscillators requiring low-frequency fundamental crystals are commonplace, but nowG‚IC frequency multipliers require the higher frequencies of third overtone crystals. Compared to its fundamental implementation however, the third-overtone....
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The circuit in Figure 1 is an RS-232/485 converter that uses the transmitted signal itself to control the flow. The circuit uses MAX232 and MAX483 interface circuits, IC1 and IC2 from Maxim Integrated Products (http://www.maxim-ic.com) to convert between the....
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Circuits using large value resistor/capacitor combinations are not very accurate because of the wide tolerance and leakage current of polarised capacitors. A better solution is to use an astable circuit together with a binary counter/divider chain which....
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The device circuit works shown in Figure 11. Power outages are frequent thing, but some occasions, the power does not allow (such as the ongoing surgery, etc.). LSE with simple circuit design, fully automated...
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High Quality very simple unit -- No need for a preamplifier
Can be directly connected to CD players, tuners and tape recorders.
Don`t exceed 23 + 23V supply.
Q3 and Q4 must be mounted on heatsink.
D1 must be in thermal contact with Q1.....
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This is a circuit to test zener diodes. It hooks up to a 120V AC line and boosts the output voltage to over 300V allowing you to test zener diodes of any voltage. The circuit also has a push button switch to triple the current, if needed. The output is....
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This Light Dark switch activated relay circuits schematics are the simplest electronic circuits that can help you to activate other electronic device at the light or dark. This Light Dark switch activated relay circuits are very simple and require one....
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This must be the most efficient bipolar transistor motor driver design for this application and I recommend it for the solar roller competitions. A 1381E is used to trigger at 2.4V. While it takes a total of 10 components plus motor compared to the stock....
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By utilizing both halves of a dual timer it is possible to obtain sequential timing. By connecting the output of the first half to the input of the second half via a 01 µF coupling capacitor sequential timing may be obtained. Delay ti is determined by the....
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Every electronic gadget primarily needs a D. C, power supply to energize it. It also forms the basic requirement for any constructional project. consequently there is a need to obtain multiple voltage values for cost reduction, convenience and compact....
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With the remote control at your fingertips, you are the only one to decide when and if the parachute should deploy. Ideally, in a very large open field, you can wait until after apogee to deploy the parachute. Depending on wind conditions, you can decide....
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Back panel terminal connectors: Audio out, Trigger In, Clock In, Clock out CV out; plus the chord of the power supply which is internal, note that there`s no button to switch it ON/OFF: just plug and play. SEQUENCER steps mode with 8 levers from lower to....
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The motorcycle anti-theft alarm is introduced in this article, it uses the private displacement sensor and has the features of high sensitivity, good reliability, low false alarm rate and easy to make. The principle of the circuit This motorcycle anti-theft....
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The power supply, with electronic stabilisation - mainly those of laboratories - it should they are protected from ??over current?? that emanates from short-circuits, erroneous association or damage of repaired appliance. The circuit offers effective....
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The following picture shows the electrical wiring connection diagram for Honda Motorcycle CB750F. It shows the connection between Honda parts such as the right turn signal indicator light, oil pressure warning light, neutral indicator, high beam indicator,....
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This simple circuit drives 6 LEDs in `Knightrider scanner mode`. Power consumption depends mainly on the type of LEDs used if you use a 7555 (555 CMOS version). We are not responsible for any injuries or damage caused by information from this website!....
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This riaa Pre-Amp is the perfect solution to getting a signal off of your old turntable and into your mixing board. Whether you want to grab a couple of loops from a 70s LP record or just archive your record collection you need an riaa compensated pre-amp to....
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1999 Buick Regal. Instrument panel lights have failed. Examined fuses related and even those not related to lighting and have found no bad fuses. Is there a CB behind the headlight/interior light switch that can be reset. What I would do first is turn on the....
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The potentiometer value is not critical: anything from 1 k © to 100 k © is acceptable. If you have built the "precision potentiometer" described earlier in this chapter, it is recommended that you use it in this experiment. Likewise, the actual values of the....
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This circuit generates a two-tone effect very much alike the cuckoo song. It can be used for door-bells or other purposes thanks to a built-in audio amplifier and loudspeaker. Used as a sound effect generator it can be connected to external amplifiers, tape....
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The circuit has a typical voltage gain of 84 dB and a typical AGC range of 80 dB. It gives very small changes in bandpass shape, usually less than 1 dB tilt for 60 dB compression. There are no shielded sections. The detector uses a single tuned circuit (L3....
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This Instructable covers the assembly of a circuit capable of PWM-ing ( pulse width modulating ) a high-power RGB LED strip and programming an Arduino to cycle through a range of colors. In this context, high power is 9-12 volts. I will discuss how to....
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A subsonic filter is mostly used in low frequency technology. Most often, the very low frequencies create distorsions in music recording or reproduction. T....
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When the phototransistor is stroken by IR light it conducts and the voltage between the 1Mohm resistor(arbitrary) and the phototrans drops from VCC to lower values. When the voltage drops lower than VCC/3 the 555 is triggered and goes high (from 0 TO VCC).....
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To decouple the sensors from the meter amplifier, either a reference junction at ooc or a bucking voltage set at room temperature may be used. The latter method is simpler, but is sensitive to changes in ambient temperature. ..
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This circuit is as shown, simple and clear. The transmitter needs 9 volts and the receiver circuit needs 5 volts...
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The unit is designed around an ordinary op-amp and easy to obtain parts. Reverse engineered circuit diagram of Anatek 50-1S variable power supply shown below. Circuit board layout does not seem all that critical and as you can see from the schematic that....
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In this project you will build a coin toss circuit. It has three sections: a square-wave oscillator, a JK flip flop, and two LEDs (red & green). It uses CMOS digital ICs and MOSFET transistors. The schematic does not show the power and ground connections for....
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This is a radio transmitter circuit diagram suitable for fitting on radio collars using NE 555 IC. he circuit transmits a pulse in the FM between band 88MHz to 105Mhz....
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found the current in both the loops using Kirchhoff`s Voltage law but then I`m confused on the proper method to find the potential drop between the two loops. I suggest you insert two extra points A and B on both ends of the battery (on the bottom right of....
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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 very simple transistor tester circuit the circuit can be used to test NPN and PNP transistors. The voltage source is a 6V power supply which is 230V AC to 6V step down transformer. It is essential to put the transistor leads in right direction like....
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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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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 by quantity as....
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The circuit works like this: Normally the LED is powered dimly through R1 and R3. SW1 is the spring and wire based accelerometer I mentioned earlier. When SW1 is closed, C2 quickly charges up (at a rate defined by R2) and is discharged through R3 and the....
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This metal detector circuit electronic project is an very simple circuit that is based on common electronic parts. This metal detector circuit electronic project is based on transistors and will provide an visual indication using a LED and an acoustic sound....
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Faced with the situation to control the time that the light is turned on, engineer Radu Preda from Romania has started experimenting with different circuits to save money spent on electricity. He has designed 2 energy saving lighting circuits, the first one....
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The simple modulator stage will accommodate most common LEDs. By adjusting the potentiometer, the bias of the transistor is varied until the LED is at its half output point. Then, audio will cause it to vary above and below this point..
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The current testbed deployment provides some degree of device heterogeneity by integrating two different type of IoT experimentation nodes. The deployment is mainly based on a largely utilized TelosB experimentation platform (170 nodes) and to a smaller....
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Here is the circuit diagram of a simple stepper motor controller using only elementary parts. The driver circuit uses, four transistor (SL100) to drive the motor windings, two NOT gates and one XOR gate to decode the two bit control logic to drive the four....
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Unmanned Ground Vehicle (UGV) or Spycar project is a radio controlled 4 wheeler, which have 6 different motions. In this 4 wheeler platform we can mount wireless camera and using the video feedback on a PC, we can drive the vehicle from a distant place ..
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This circuit might also be of interest to people making pre-amps for electret and externally polarized condenser microphones which have no internal FET. (If a single FET`s noise is the limiting factor, perhaps two or four could be run in parallel. ) Some....
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The heart of the circuit is a 555 oscillator /timer, Ul, configured for monostable operation. The output of Ul at pin 3 is tied to the gate of SCRl. As long as Sl-S5, which are connected to the trigger input of Ul, are open, the circuit remains in the....
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The key point is that there is no iteration as is usually done. All alignment methods I have seen rely on measuring, tweaking, measuring, tweaking, etc. There are many problems with this: for the DIYer it means expensive tools or settling the suspension....
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Because small, precision high, high sensitivity and definition higher advantage with low price of having size of SAW sensor, so has produced SAW gas sensor composed of surface acoustic wave device, sensitive membrane and relevant detection circuit. The....
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Here is the diagram of radio controlcarreceiverprinciple circuit. Notes:The choice of transistor Q1 and the bias resistorQ1 1815 9018R1 240K 100K The choice of the high-frequency parameters partFrequency C1 C2 L227M 35P 30P 10uH35M 30P 30P 8.2uH40M 30P 20P....
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The input stage of this voltmeter circuit uses operational amplifier and diode feedback to form linearity peak value rectifier circuit. Through R2/R2 partial pressure isolation, it is sent to double multi-channel BCD output A/D converter CA3162E, it also can....
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The MOSFET input of the CA3140 makes it ideally suited for use in a high impedance DC voltmeter. Switch S1 is the range selector. The input impedance is limited to 10M by the resistors used in the voltage divider, but this is still a very acceptable value.....
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Chrono or Chronograph, the term used by Airsofter and Paintball players to refer to the device that measures the muzzle velocity of firearms. This is also called MVMD, short for Muzzle Velocity Measuring Device by the British Army. Muzzle Velocity is the....
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A 100 Watt inverter circuit using minimum number of components. I think it is quite difficult to make a decent one like this with further less components. Here we use CD 4047 IC from Texas Instruments for generating the 100 Hz pulses and four 2N3055....
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This circuit allows audio monitoring of a remote location and so doubles as a room monitor or baby alarm. It canbe run from a 12 Volt battery or mains power supply as shown below. Interconnect uses 3 wires, so multi core cablecan be used; alarm or telephone....
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Most ATV (Amateur Television) transmitters transmit a DSB signal and commercial television stations use a VSB (Vestigial Sideband) signal. This fact is made use of in this converter to use the lower sideband. This results in less interference from repeaters....
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The recent Epilog Laser Challenge at Instructables. com got me thinking about building a low cost CNC laser. The engrave r they had as the prize had a list price of about $8, 000. The income tax on that would be quite a lot. I thought a larger more powerful....
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The LM3914A bargraph LEDis used here as a voltmeter for battery testing. The circuit is powered by a 4.5-V battery and compares the battery under test with an internally derived reference, set by R1/R2/P1. Each LED of the 10 represent 10% of full scale...
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The design is based entirely on Silicon Chip`s PIC-Based Water-Tank Level Meter, but instead of programming PICs, I prototyped using an arduino, and built the final version using PICAXE microcontrollers. An MPX-2010DP silicon pressure sensor (temperature....
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PICkit 2 Introduction: There are many PIC programmer available, commercial and DIY devices. As Microchip introduces the new microprocessors the prog....
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h5. Introduction In this post we present the last application created from the development of the modular remote control we started describing in the issue of April....
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This circuit is a circuit diagram gauges simple wind meter. Working principle of this circuit are the transistors Q1 and Q2 are used to feel the wind. The relationship between thermal impedance and the surrounding transistors utilized wind speed here.....
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This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and the second op-amp buffers the output to drive the piezo transducer. R5 sets the switching....
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Hi guys I have recovered these beautiful valves from an old television destined to scrap. From this I have saved the 6CU6 (h.deflection) and a double....
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Determining which drive wire is which on a unipolar stepper motor. This is the type of motor that I have most commonly found surplus or in salvage equipment Platform: PIC16F877A using BoostC connected via rs232 to a PC running a terminal program. The PIC....
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Test signals inserted in the lines of the vertical blanking interval, defined by the TV standard, e. g. for the 625 standard the CCIR together with the EBU issued the formal specifications for the signals inserted in lines 17, 18, 330 and 331...
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Read the article and learn how you can make your own parking sensor for just $4.99...
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It has been interesting analyzing these radios. You have to give the Japanese credit for even making a radio that can drive a speaker with only 2 transistors! Basically, the first transistor (Q1) performs double-duty. It first acts as an RF amplifier, with....
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The Car Temperature Gauge is basically the same circuit as March's project with some minor changes to the input circuit. This circuit will display the water temperature to 1 degree resolution...
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The bicore is the basis of advanced BEAM! Most intermediate to advanced BEAM robots are built off of the bicore. Uses go all the way from photovores to servo motor drivers to walkers to.... You get the idea. What it is is basically just an oscillator who's....
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Using any camera in a dull or dark environment generally requires the use of supplementary light. This is a standard technique, and even where adequate natural lighting exists, to take conventional film pictures with enhanced contrast using a fill-in` flash....
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Many power-supply designers like to have a regulator latch off in the event of an overcurrent situation or other fault condition. Yet, many PWM controllers do not internally support this latch-off function. Most do, however, have a power-good output and an....
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RealView is a measurement application, which records and plots measured values from analogue hardware devices in real-time. Several curves can be plotted into a single diagram. Several diagrams can be arranged on one or more pages if necessary. Plot options....