Popular Circuits Page 87
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We are going to build a START-STOP drive (as commonly found in professional tools), that is a circuit with one switch to run the output (an LED in this case) and one switch to stop it. Nutchip feature two kind of inputs: general purpose and fixed inputs.....
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This small video transmitter is very usefull for video surveillance on short distances ( up to 100m ) equipped with a black and white or infrared camera mo...
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This LM350 Car battery charger circuit project is a high performance charger that quickly charges gelled lead-acid batteries and turns off the charger process at full charge. This LM350 Car battery charger circuit will provide a charge current of 2A when the....
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This strobe light operates from standard 120-Vac power. Rl limits the amount of current applied to the voltage doubler stage, which is comprised of CI, C2, C3, Dl, D2, C4, C5, and C6. Capacitors CI, C2, and C3 are connected in parallel and form a....
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The mixer is really handy for DI`ing guitars and basses into soundcards or other mixers and making use of channels on mixes that do not have mike in`s, it comes in handy for one or two guitarists that want to sing and play through one guitar amplifier as....
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This is a compact, easy to build amplifier that uses one IC only but delivers 40 watts of audio power. It is ideal for amplifying audio from your mobile CD player or iPod. The chip being used here is the TDA1514 originally brought to the market by....
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One is in a leather bag and is model EE-8-A. One or more is in a canvas bag and is EE-8-B. All have handsets with the butterfly push-to-talk lever. The -B model does have an original handset and cord. These have been tested in both LB and CB modes and work....
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Simple but reliable car battery tester Circuit diagram This circuit uses the popular and easy to find LM3914 IC. This IC is very simple to drive, needs no voltage regulators (it has a built in voltage regulator) and can be powered from almo....
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As shown in FIG grounds with three-wire serial interface smart temperature sensors DS1620 small electric heater temperature control circuit. When ..
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A very simple encoder circuit for a dc motor can be constructed using this circuit diagram. As you can see in the circuit diagram, the system shown consists of the HA-2542, a small 12-Vdc motor, and a position encoder. During operation, the encoder causes a....
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This light chaser circuit (music-operated lighting effect generator) comprises five sets of 60W bulbs that are arranged in zig-zag fashion. The bulb sets g....
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It is all very well knowing how to program the PIC in theory, but the real learning comes when you try your code on a PIC and see the results yourself in a circuit. You could build a circuit each time and program the PIC to see if the program works, or you....
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Discrete components 13TL amplifier, the circuit structure is complex, with an integrated power amplifier circuit of BTL amplifier circuit structure is simple, performance and q..
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A good way to mount the circuit board is to use a hot glue gun to "mold" the circuit underneath the lamp housing. There is plenty of space there for your board. At the next photos you can see the circuit board mounted on the small 31cm IKEA Mylonit Lamp.....
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Many of us have a pair of headphones connected to the output of the computer sound card us either to enjoy songs, or a game. Very likely your headphones and microphone, which also connect to the appropriate slot your sound card. But at some point broke down....
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In this power stabilizer circuit, one relay is wired to select the high or the low tap from the stabilizer transformer at some particular voltage level; whereas the second relay keeps the normal mains voltage switched in, but the moment there`s a voltage....
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Here is a simple thermostat circuit that can be used to control a relay and supply power to a small space heater through the relay contacts. The relay contacts should be rated above the current requirements for the heater....
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The various signal frequencies are obtained for an incoming carrier centered at 49.86 MHz. The receiver employs double conversion, with i-fs at 10.7 MHz and 455kHz. Ceramic filters are used in both i-fs for selectivity and reduced"coil count. A quadrature....
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this circuit rougly doubles the voltage of the input, however the current output is low. doubled output is at `V source.`..
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This is a simple 4 W fluorescent lamp driver circuit that can be operated from a 12 V supply. The first part of the circuit includes a NE555 timer IC wired as an astable multivibrator. The output pulses from the IC are amplified by the transistor Q1. The....
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Two soft start power supplies. The output voltage slowly increases to the desired output..
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The circuit presented here guarantees that if bulb Lai "gives up the ghost," bulb La2 will take over its tas..
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Current to voltage converter circuit can be made using a single resistor, it is very simple since any current will naturally develop a voltage when flow through...
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The first test circuit (see figure 5) is about the simplest circuit that can be designed around the device. The sensor is drawn in the schematic as if you are looking through the top of the sensor to the 12 leads below. The circuit uses four LED`s for....
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This circuit uses a CMOS chip and a VMOS FET amplifier for 6 W of audio output. 18 W of audio can be generated using ..
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This amplifier circuit has a pretty good quality. Of course the sound quality, although this one amplifier does not have a large output power but in terms of soft and loud voice that this amplifier can be unreliable. With a single IC capitalize MPC576H and....
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Ok, I have been looking for this circuit on line now for a while and I finally found it. (Thank you Kostas 711 in Patras City, Greece. ) Turns out it is a pretty simple circuit. Part of it is a voltage regulator and filter to isolate the voltage supplied by....
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When there is no smoke the light from the bulb will be directly falling on the LDR. The LDR resistance will be low and so the voltage across it (below. 6V). The transistor will be OFF and nothing happens. When there is sufficient smoke to mask the light from....
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This index is arranged alphabetically on each word (except prepositions). For example, the "Frost Alarm" will be indexed under "A" and also "F". To quickly find a circuit use the top index or try your browsers search function. In Firefox, Konqueror, Opera....
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Analog switch (double loop, double-break) and differential modulation amplifier complete the work. The carrier control switch, switch contacts in the time, from the inverting i..
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You cannot use a multimeter to check a crystal. You should have a this circuit, because it can check a crystal 100Khz to 900Mhz, easily to make and cheap.The....
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Sometimes the need arises to construct a really simple oscillator. This could hardly be simpler than the circuit shown here, which uses just three compone....
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Broadcast band frequency modulation (FM) radio was invented to solve existing problems with noise and fidelity on the amplitude modulation (AM) broadcast band. Thus, the first FM receivers were quite complex in design, employing a superheterodyne converter,....
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This design adopts a well established circuit topology for the power amplifier, using a single-rail supply of about 60V and capacitor-coupling for the speaker(s). The advantages for a guitar amplifier are the very simple circuitry, even for comparatively....
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Speaker relay delay controlling circuit for audio amplidier..
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Many systems require that the primary source of DC power be converted to other voltages. Battery driven circuitry is an obvious candidate....
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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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Using a capacitor sensor to detect a water level is a simple method of sensing. This circuit uses C5, which..
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The first 5 circuits described in the following sections were reverse
engineered from commercial HeNe power supplies. There may be errors in
transcription as well as interpretation. In many cases, the transformer
secondary voltage was not marked and....
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The HA-5033 is a unity gain monolithic lC designed for any
application requiring a fast wideband buffer. A voltage
follower by design, this product is optimized for high speed
50W and 75W coaxial cable driver applications common in
color video systems.....
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This circuit is meant to be driven by a 1-MHz standard signal of a few volts amplitude. Ul through U5 are 7490 decade counter/divider and produce a division ratio of 100,000:1. Successive divisions of 10 can be tapped off, if desired, between stages. ..
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Sorry, it seems that the file you`re attempting to access no longer exists! The file may have been renamed or removed from the archive. Please use the navigation links on the left to browse the area of the archive you`d like to visit. You are connected to....
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Function: Used for measure the voltage change minute by management before the temperature diodes. Component: IC, Diode, Resistor, 3-1/2 digit LCD (SP521PR)....
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In this interface session we are interface mcp3202 adc interface with 8051 microcontroller. Mcp3202 is a 12bit spi protocol adc, is interface with P89v51rd2 microcontroller,this microcontroller have spi protocol so no need to worry about SDI,SDO,CLCK.....
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The circuit will give us amps (12 amps surge) with performance that equals or exceeds any commercial unit. The circuit even has a current limiting feature which is a more reliable system than most commercial units have....
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This solar birdhouse light is an economical circuit of a mini solar lighting system circuit is presented here. At the heart of the circuit is a mini 6V/2W solar panel. Here, this solar panel is used to charge a 4V/800mAh rechargeable battery through a charge....
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The Fv-1 has internal circuitry to support an external crystal, preferably a 32768Hz watch crystal. These crystals are extremely inexpensive and widely available. Frequencies other than 32768Hz are available, but not as cheap and not as plentiful. If the....
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AC arc welding machine transistor load path of the power from the second circuit is shown. The figure, the current transformer TA core cross-section 25rrirr12, as l primary tur..
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When I purchased this little charger back in 1970 I didn`t think I`d be writing about it today but here we are! Back then I was a lot younger, I had an old car for transportation, and it had an old battery. It didn`t have a lot of cranking power when the....
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This is a 12V 100mA Transformerless power supply in support of low current applications. C1 is the X rated AC capacitor so as to reduces climax volt AC. D1-D4 rectifies AC to DC and C2 removes ripples. R1 is the bleeder to remove stored current clothed in AC....
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This experiment may be built using only one 8-position DIP switch, but the concept is easier to understand if two switch assemblies are used. The idea is, one switch acts to hold the correct code for unlocking the lock, while the other switch serves as a....
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The circuit in Figure 1 can intelligently control ac or dc current when connected in series with a load. The circuit "steals" its power by turning off the load at a low duty cycle. The switch uses the MOSFETs` parasitic body diode to its advantage. While the....
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For many years now, magnetic (or electromagnetic) water descaler devices have been showing up on the shelves of Home Improvement and other DIY stores all over Europe. Despite the numerous studies completed on that subject, by manufacturers as well as by....
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This simple audio power amplifier was originally designed for a circuit board workshop, conducted by the OSU IEEE Student Group. At the workshop, 20 participants each constructed this amplifier, by etching and drilling the single sided circuit board,....
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It is a single stage class A MOSFET design with the right gain and a low output impedance. Here we don't have the limitations of the Zen amps (at least in the single-stage implementations) regarding speaker compatibility. A single stage topology with....
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This super simple design of aninvertercircuit does not limit it in any way from providing a high output power and an efficiency of a good 75%. Learn how to build aninverterthat will satisfy most of your power requirement at quite an affordable cost. The....
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Use a relatively high-end microcontroller ( Piccolo TMS320F28035, 12-bit resolution, +/- 4LSB offset, +/- 60 LSB gain ) to measure voltage across stacked battery cells and control associated analog electronics to equalize their charge. The microcontroller....
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Our programmable MP3 player has an interface to an LCD with a HD44780 controller. These are alphanumeric LCDs with one to 4 lines of text and 16 to 40 characters per line. However, these LCDs (and LCDs in general) exist in two varieties: those that require a....
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Using this circuit, audio musical notes can be generated and heard up to a distance of 10 metres. The circuit can be divided into two parts: IR music transmitter and receiver. The IR music transmitter works off a 9V battery, while the IR music receiver works....
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This circuit uses a sensor made of a small piece of etched PC board and a simple SCR circuit to detect rain and sound a buzzer. The SCR could also be used to activate a relay, turn on a lamp, or send a signal to a security system...
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Circuit as shown. This circuit uses NEC Corporation of Japan as a major production upc1651 integrated circuit device, the circuit gain high, stable, thus ensuring high performance microphone. It consists of using the FM transmitter circuit...
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First thing`s first, what software to use I went with CadSoft Eagle primarily because there are lots of tutorials out there covering it, and that seemed like a good place to start. Once I understand the process I can worry about what software I use, but for....
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This is a 25 Watt basic power amp that was designed to be (relatively) easy to build at a reasonable cost. It has better performance than the standard STK module amps that are used in practically every mass market stereo receiver manufactured today. When I....
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Note: If you would like to learn more about the circuit that powers the Sifteo Base audio read on! Otherwise feel free to skip to the next step. Our....
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This audio processor circuit features the SSM2045 IC which was developed specially for electronic music applications and the 741 opamp IC. The circuit is configured as a low pass filter with a DC voltage control for gain. The input signal is set to a working....
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The governor following is intended to regulate the light intensity incandescent 220 V. The components in a relatively few, which means it can easily be mounted onto a small plate. After the build, we recommend you place it inside the box which is flush....
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BISS0001 is a sensor signal processing integrated circuit with higher performance, it is accompanied pyroelectric infrared sensors and a small amount of external components con..
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As shown in the circuit as a precision bright light control circuit, its work is not affected by the power supply voltage and ambient temperature. Resistors R1, R2, R6 and phot..
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This is Circuit LM3914 LED VU Meter. use IC1-LM3914 and Transistor BC109C, By circuit will show level of audio signal(power Music) is dB in six level by LED...
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Today`s electronic designs are focusing more on optimizing efficiency in an attempt to minimize unnecessary power dissipation not only to maximize battery life in portable applications but to also assure that the application is running as cool as possible.....
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As shown in Fig division factor is optional delay circuit. Circuit consists of two 7-bit binary serial counter CC4024, controlled pulse source (gate 1, 2 composition) and the i..
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This sine wave generator is adjustable between 15 Hz to 150 kHz. The circuit is basically a Wien-bridge oscillator, with multiple capacitor selection. Here is...
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I have finally finished my first prototype PCB but I am a bit worried about the amount of heat generated when using the BMSat max power in myapplication (ultralight hybrid electric vehicle). At 30A cont/50A burstI have almost 20Wloss. It seems to me that it....
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Build an oscillator that will satisfy a few requirements. The main requirement is to have exactly one capacitor. Another one is to have high Q and sine wave output. I am considering Hartley`s oscillator design. Since it has only one cap. I don`t what to....
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It is actual absorbing and acceptable to be able to ascendancy aggregate while sitting at your PC terminal. Here, a simple accouterments ambit and software is acclimated to interface a 7-segment based rolling display. The printer anchorage of a PC provides a....
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Circuit High power car audio amplifier schematics Circuit Electronics, This is a power amplifier which functioned as the car audio amplifier IC that uses PA02 and LH0101. That each IC has a 30W output power with 8 ohm impedance. Part List R1....
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Color sensor circuit which can sense eight colors, i.e. blue, green and red (primary colors); magenta, yellow and cyan (secondary colors); and black and white...
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4W FM Transmitter. TECHNICAL CHARACTERISTICS: Stabilised tendency of catering: Vcc=12~16V Frequency of emission: 88~108MHz Consumption: 100~400mA Materially: The...
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or take one FET, one Zener, and one resistor. No FET and resistor needed if the current is in the range of specs for a zener. Or take a P-channel....
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Complete wireless product development by LS research. Specializing in RF Design, WiFi modules, Antenna Design, Zigbee, Bluetooth and more....
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This is a very simple RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module (WZ-X01). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy. The transmitter can be powered....
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The inputs of the 74LS153 chip were mixed, which caused the address block decoding to fail. By now, I know of two Commodore 64 (mine and Pekka Pessi`s) where this expansion has been built, and of four Commodore 128s (of which two expanded by me, and the....
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This transmitters' intended purpose is for morse-code only in the 30 meter band (10Mhz). It is a low-power QRP type and needs to be connected to your existing tranceiver. The harmonic rejections on the prototype were measured at 40dB on 20Mhz and 50dB on....
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The GB4550 and GB4550A are high performance monolithic
video buffer/clamps made on Gennum's LSI process.
They feature a wideband differential amplifier that can be
configured as a gain stage. The output signal voltage is
limited to +2V above the clamp....
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Telephone ring tone generator circuit, built with only several components. It generates simulated telephone ring tone and requires 4.5V DC to 12V DC voltage..
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Everything works just great. The final software is 930 lines of assembler. I also learnt how to use ProTel so I could draw up the final circuit properly. Here`s the result. Notice that I`ve got it down to just one chip now, the little PIC is doing....
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This design allows to operate two intercom stations leaving the operator free of using his/her hands in some other occupation, thus avoiding the usual push-to-talk operation mode. No complex changeover switching is required: the two units are connected....
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Already generated a voltage of 30 volts by using frequency generator and frequency to voltage converter, which stored in battery. Now I want to do inverter by taking 12v and convert it to 220v. What is the solution That`s a great idea and I`m also working on....
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This small circuit is ideal for checking the basic operation of an infrared remote control unit. The circuit is based on the brilliantly simple idea of connecting a piezo buzzer directly to an IR receiver IC. This method is almost as simple as connecting a....
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You need center tap transformer. for example, if you need 12v output, you should connect J1 to 15v transformer output, J2 connected to 0v and J3 connected to another 15V. ..
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A fast electronic fuse designed to operate on 230V AC with an adjustable trip current. When the current through the load exceeds a level determined by the....
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This is the voltage converter to get the voltage of ±1,25-30V from the input voltage of ±35V. I am using the 3 terminal voltage regulator for the voltage to be changed in this unit....
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Reverse the DC power connections on such a motor and its shaft will rotate in the opposite direction. One way to control direction is to use switches arranged in the following manner: This configuration is called an H-Bridge due to its shape. Let`s say that....
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ptPC1891A application circuit, where in SA is working state switch, a total of four to choose from, it is mainly through the..