Popular Circuits Page 209
- Page 209
-
Making a hi-end, accurate digital LED clock today is as easy as cooking noodles. The article explains how a digital clock can be made using over the counter electronic chips like the National s MM5402 clock IC and a handful of other components. This single....
-
-
The voltage-to-current converter in Figure 1 can both source and sink current. The circuit is more flexible than some traditional current references that require different topologies for current sourcing and sinking. Also, you can easily adjust the value of....
-
The TPS61200 spec says GND is control/logic ground and PGND is power ground but this isn`t reflected in the symbols chosen in the diagram. I`m also puzzled why the link to earth is shown on GND rather than on PGND. From this key it seems that various parts....
-
This weeks project is a simple 4-step sequencer based around a 4017 decade counter chip. The basic schematic is based on this circuit, using a 555 timer as a clock source: I changed it a bit by having the 4017 outputs drive transistors that switch current to....
-
In this project it was used the ?Piranha Super-flux RGB? Led of common anode, and the PIC18F25K20, in order to generate combinations of colors. It has two function modes, automatic that generate the color sequence that is stored in the ?C memory, and the....
-
-
-
This circuit features automatic exit and entry delays - an optional instant alarm zone - an optional intermittent siren output - and an automatic reset. By adding external relays you can immobilize the vehicle and flash the lights. For automatic operation -....
-
This circuit emits a beep and/or illuminates a LED when someone touches the door-handle from outside. The alarm will sound until the circuit will be switched-off....
-
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 various consumer....
-
A short-circuit-proof battery charger will provide an average charging current of about 8 A to a 12-V lead/acid storage battery. The charger circuit has an additional advantage; it will not function nor will it be damaged by improperly connecting the....
-
A simple and effective receiver for actuating garage doors, alarms, warning systems, etc. The SCR, which has a very low trigger current 30 µ is typical—it requires an input power of only 30 juW to activate the relay. A high Q tuned antenna circuit assures....
-
-
A gate voltage is applied to initiate the proceedings. When the gate voltage is in the ON state, Q..
-
This unit is a single oscillator built around an LF351 JFET-input op amp. Resistors Rl and R2 bias the noninverting input while R3 biases the inverting input from the output. This layout provides lOO% negative feedback, but the decoupling caused by C2....
-
One of the simplest method of metal detecting is by beat frequency oscillator. Basically, the circuit consist of two balanced oscillator. One oscillator provides the reference signal, and other oscillator is acting as the detector element. The reference....
-
This is Xenon Strobe Light circuit, model continual use a tube Xenon at give many brightnesses. By can fine blink fast or slow get , with VR1. By have SCR...
-
A step-down circuit used to approximately divide by two the rms voltage between the line input and the inductive load (L1) is shown on circuit diagram below. A turn-on delay of approximately 7 ms is provided by C2 and R3. We can discharge C2 at each line....
-
-
Greeting, This post summarize the work of switching power supply schematic diagram experts who are completely familiar with all the aspects of....
-
This is circuit design for a laser diode driver can be implemented using voltage-controlled current source. This simple linear laser diode driver gives cleaner drive current than a switched (PWM) drivers. This circuit is based on OPA350 IC. This is the....
-
The above circuit can he used to hear am statons in ur fm radio .It is a regenerative circuit that samples am signals of all frequency and re transmits them in the fm hand [88-108] an even in the TV hand .The capacitor C1 can be varied to receive different....
-
Two NAND gates are used for the oscillator, and two as the control. If the two-tone speed needs to be altered, the 220 F capacitors can be changed (larger for slower operation). If the frequency of the oscillator is to be changed, the 0. 2 and 0. 1 F....
-
-
This circuit is intended for alerting purposes after a certain time is elapsed. It is suitable for table games requiring a fixed time to answer a question, or to move a piece etc. In this view it`s a modern substitute for the old sandglass. Useful also for....
-
This audio power amplifier is very good for your portable devices, or for your headphones amplifier. The circuit of this audio power amplifier is very simple,....
-
Fast charging circuit It shows voltage and current waveforms and fast charge circuit configuration of the charger. Detection and control circuit of the circuit is composed of t..
-
As shown in the circuit to light when the intensity 700lx above action, this time through the ..
-
In this picture is everything you will need to make a self running power supply. The input is a 12vdc 7ah lead acid or gel cell battery (not shown). The input goes to a 12vdc to 120vac inverter of about 200 watts more or less, it is not critical as long as....
-
The circuit shown here works from 24V DC and can flash two 24V bulbs alternatively. The circuit is nothing but an astable multivibrator operating at 1Hz and 50% duty cycle. The lamp to be flashed is connected in place of the collector resistor (Rc) of a....
-
The following circuit diagram shows the application of LM117 on High Current Adjustable Regulator. The LM117, is capable of supplying in excess of 1.5A over a....
-
A single connection change permits division by any integer between 2 and 10. The RCA CD4017A Johnson decade counter is shown connected as a divide by 7 counter. The resistor is used to hold the reset line low. When the appropriate number is reached, that....
-
The figure shows that input from the varistor overvoltage protection role. VDi - VD4 rectifier, L1, C2, q filtering. R, c9 and VD6 composition oscillation starting circuit, the transformer T and H, V and other components transformer coupling high-frequency..
-
This is a TV transmitter for transmitting video of various video sources such as video cameras, Satellite receivers, DVD players, game consoles, etc. TV transmitter`s circuit is working on the 470-580 MHz frequency and can be received on UHF channels 21-34.....
-
This is vWalker v1. The "v" standing for V, as in five. It is a five motor walker that goes towards light and avoids obstacles. The goal was to create a walker that could navigate over rough complex terrain while seeking out the brightest source of light.....
-
Beware that not all transistors share the same terminal designations, or pinouts, even if they share the same physical appearance. This will dictate how you connect the transistorstogether and to other components, so be sure to check the manufacturer`s....
-
There are 2 kinds of solar automatic tracking controllers. One is Schmitt trigger light control composed of a light sensor and a Schmitt trigger or monostable trigger. The second one is usingtwo light sensors and two comparators to form two light-control....
-
High Quality unit with LM833 or NE5532 Low noise Dual Op-amp.
No need for a preamplifier. # Can be directly connected to CD players, tuners and tape recorders.
# Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 2000....
-
ASIC design choosing highly integrated, low-power, short development cycle to complete this FPGA design to achieve a system of background, has a strong practical significance a..
-
BKQ series automatic parallel controllers are designed specifically for small hydropower automation devices in parallel for a capacity of 3200kW and below the high or low press..
-
The circuit is bell timer. This new project uses AT89S52 microcontroller and I2C EEPROM to store the alarm timings. Also the 7segment display is replaced with LCD display. DS1307 is used for Real time clock. The user can store upto 25 bell timings and they....
-
The particular interest of the ADL5519 is focused on bandwidth which is specified up to 8GHz (but still usable in 10GHz with reduced dynamic). With two channels, it is possible to measure the power transmitted to the antenna and the reflected wave, to....
-
This circuit was designed to not fry the 555 timer, this is because I noticed that having the ignition coil share a high voltage contact with a power connector made somewhat high voltages go back and into the 555 timer, thus frying it (I went through about 7....
-
A gyrator is a circuit using active devices and transistors to simulate an inductor. In this case the gyrator is the transistor acting with R1, R3 and C2. It could just as easily be a unity gain op-amp (which gives superior performance). The circuit includes....
-
Aseries combination of 16 LEDs Gives a luminance (lux) equivalent of a 12W bulb. But if you have two series combinations of 23 LEDs in parallel (Total 46 LEDs), it Gives equal to a 35W light bulb. Diode D1 (1N4007) and capacitor C1 act as rectifying and....
-
Capacitance meter is one instrument that you should have in your toolbox if you are an electronics hobbyist, or if you`re a professional electronic technician....
-
A signal averager circuit can be formed by an amplifier and active signal rectifier, which is implemented using two operational amplifiers in this circuit. The....
-
Simple and low cost. The optimal supply voltage is around 50V, but this amp work from 30 to 60V. The maximal input voltage is around 0.8 - 1V. As you can see, in this design the components have a big tolerance, so you can build it almost of the components,....
-
By the old I *, jh;, ililiiit; NE555 circuit implementation and other child member, NE555 1yj complex I end (6) feet. Set bit Vr: {2) feet Ding electrical equipment connected s..
-
-
This project was developed as an inexpensive way to drive small dc brushed motors as positioning servos for use on a desktop sized CNC machine. The board is interfaced to the PC through 2 pins of a parallel port. The drive signal on these pins is known as....
-
-
ok LOL i will buy transformer to run in a 12V battery but this one is not similar to what the user romerouk from overunity is using?....
-
National LX5700 temperature transducer provides input for code conversion circuit driving 3-digit LED display indicating temperature range from -40ƒ to +100ƒ or -40 °F to +199 °F under control of ganged switch. -"Linear Applications , Vol. 2, " National....
-
A simple 5V boost converter using LTC3440 shown here. LTC3440 is a high efficiency DC to DC converter that can be operated from input voltages below, above or equal to the output voltage. As for the synchronous rectification, LTC3440 delivers up to 96%....
-
This circuit exhibits a 10 V acquisition time of 900 ns to 0% accuracy and a droop rate of only 100 µ-V/ms at 25° C ambient condition. An even faster acquisition time can be obtained using a smaller value hold-capacitor. By decreasing the value from 1000....
-
The Ambient Power Module (APM) is a simple electronic circuit which, when connected to antenna and earth ground, will deliver low voltage up to several milliwatts. Generally a long wire antenna about 100` long and elevated in a horizontalposition about 30`....
-
This Basic MOSFET amplifier is very simple to build and low cost. Is perfect for Hi-Fi amplifiers and instrument amplifiers (guitar, keyboards ). Output power is + / 100 Wrms at 8 ohm load or + / 160 Wrms below 4 ohms. The simplicity of this circuit cause....
-
Connect a 12 volt 20 watt lamp and 12 volt battery to the circuit (observe battery polarity). Momentarily press and release the button to turn the lamp on. Repeatedly press the button to cycle through the power levels. Pressing and holding the button will....
-
An IBM PC can operate the two 12-bit A/D converters in Fig. 1 via its printer port. The converters" serial outputs use only two o..
-
The front end of the DAC is configured differentially using dual eight-input IC multiplexer 1H6216 and three LM156 op amps. Following the differential amplifier is the programmable gain stage discussed earlier, with a low-pass filter on the output feeding....
-
By an integrated power amplifier TDA2040 (lC) can also form OCL power amplifier (OCL meaning is no output capacitor power amplifier). Circuit shown in Figure 10-10, which uses ..
-
Here is a simple little HF TX. It may be modified for all the HF bands, but the details given are only for the 7MHz band. The basic transmitter uses two transistors; BC547 (as usual) and will deliver over 250mW of power. CW keying may be achieved by....
-
-
By combining the responses of an Analog Devices (www.analog.com) AD590 temperature sensor and a Humirel (www.humirel.com) HS1101 humidity sensor, you can generate a single TTL-level signal containing information from both sensors (Figure 1). This design uses....
-
QST`s most recent development ”the Tri-tet oscillator ”has made the single-tube crystal transmitter a really practical affair at last. Practical because it is now possible to work equally well in two ”and, in a pinch, in three ”amateur bands with a single....
-
I decided to make one for $45 in parts. Judging from the components I ended up using, one can tell. The motors and tires were salvaged from a broken electric wheelchair, the metal was scrap, the battery surplus from a garage sale, all the circuits....
-
-
-
This circuit is designed to drive the 1W LEDs that are now commonly available. Their non-linear voltage to current relationship and variation in forward v....
-
This circuit was designed as a warning flasher to alert road users to dangerous situations in the dark. Alternatively, it can act as a bicycle light (subject to traffic regulations and legislation). White LEDs only are recommended if the circuit is used as a....
-
This simple AVR Programmer will allow you to painlessly transfer hex programs to most ATMEL AVR microcontrollers without sacrificing your budget and time. It is more reliable than most other simple AVR programmers available out there and can be built in very....
-
-
-
A Transcutaneous Electrical Nerve Stimulation (TENS) device is, put bluntly, a machine for giving electric shocks. The author was prescribed such a device on loan by his orthopaedic specialist. The unit has a large number of programmes, of which he used only....
-
-
This simple LED torch is driven by a 2-transistor blocking oscillator which steps up the voltage from a 1.5V cell. It relies on the inherent current limit....
-
The alarm is "set" by opening Sw1. It can be any small 1-amp single-pole change-over switch - but for added security you could use a key-switch. Once Sw1 is opened you have about 10 to 15 seconds to get out of the vehicle and close the door behind you. When....
-
-
This circuit uses the TLC555CP timer I. C. to flash an LED roughly twice every second. This particular type of 555 timer will run off only 3 volts so two 1. 5 volt cells can be used. With "AA" cells, you can expect a battery life of up to 6 months. With....
-
The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0. 5 watts at 4. 5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form....
-
The inductive sensor is a simple enough device at the fundamental level. It is simply a coil of wire with a current passing through it. It completely ignores most objects which pass near this coil. However, when a metallic object passes near it, it acts as a....
-
The FM radio receiver with PLL designed by A. Zaharov [1] still attracts the attention of radio amateurs. As noted in a publication of the magazine "Radio" [2, 3], one of the major drawbacks of this type of detectors is the low adjacent channel selectivity.....
-
Telephone remote control for some of the ideas is the time, now can let you own a phone to do remote control, this is the procedure and circuit. Automatically executed complex functions. Facilitate the development of a telephone...
-
This circuit is a modified Hartley oscillator with a couple of extra components included. The transformer is a small audio transformer, type LT700. The primary is center tapped with an impedance of 1Kohms at 1KHz. The secondary has an impedance of 8 ohms.....
-
As shown, the upper and lower symmetric configuration two basic differential amplifier, differential input + IN and -IN are respectively connected cares balanced input. Because..
-
Exars XR-L555 circuit typical power consumption is 900 W, the power supply voltage of 5V, micro-power circuit, XR-L555 can be used directly in place of the 555 timer. Delay by ..
-
Welcome to the weblog where we discuss about electronic circuits schematics, PCB design, diy kits and electronic projects diagrams. Here is the circuit diagram of a magnetic proximity switch that finds a lot of applications in abounding fields. The ambit is....
-
This circuit can be used to check up to an eight-conductor cable. IC1, a 555 timer, drives decade counter..
-
The 5 V from USB seems to be powering the led on my laptop power brick. Hence even when I switched the power brick off at the wall outlet, the led is still on. When I unplug the USB it goes off but comes back on again as soon as I plug it in. Do Ijust but a....
-
As we all know, high-voltage isolation switch is not allowed to meet with a load that would otherwise produce arc, causing a short between the high voltage bus road accident, e..
-
Plug an ATtiny12 into the 8 pin socket and hold down "GO!" button. The LED will come on at the end of the programming process, which only takes a couple hundred millisecond. The fuses are now restored to their factory default states. This picture was taken....
-
A, RS485 bus Introduction RS485 bus is a common serial bus standard, using balanced differential transmit and receive mode, and therefore has the ability to suppress common mod..
-
This circuit is useful where fast signal acquisition and high precision are required, as in electronic scales. The filter's time constant is set by the 2 ohm resistor and the 1 µ capacitor until comparator No. 1 switches. The time constant is then set by....
-
-
This is a take off from the previously posted bicycle anti-theft alarm. One commenter indicated a desire to adapt it to a threshold step plate vibration de....
-
This car audio stereo amplifier can deliver up to 30W on each speaker and it is build with TDA7394 from Philips TDA7394 datasheet....
-
I tried to design a timer that would do everything it needed to do but with the smallest number of pieces and simplest mode of operation. It only needs the PIC, a four digit LED display, one other IC, a resistor network, one pushbutton switch and a....
-
The MiniLOGGER provides 8-channel analog input(-99mV to +999mV), 1-channel pulse input, battery backup 256kB SRAM, Real-time Clock, and RS232C. Start/Stop recording can be made by MANUAL switch or preprogrammed Start/Stop Time. The format of uploading data....
-
-
The circuit constitutes a natural extension of Mic-Line balance unit, but can be adapted to any other audio circuit. It is made up of two units in the series : A) A classic unit bass/ Treble and B) a parametric unit of mid frequencies. Both units can also be....
-
Figure 4-12 is a five-speed type tone selector schematics o as follows: circuit, IC1 and other components electromagnetic phono equalizer amplifier, I bar and external RC compo..