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| Clicks: 18630 | Votes: 2 | Comments: 0 | Rating: 7.5 | Rank: 2
Sounds from the IC IT82207
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This circuit is able to take you to the world of the Wild West. For this it uses the integrated 18-pin IT82207 (IC1) of Holtek, which literally takes care of everything. You have to do is add a few accessories, including a loudspeaker and six selector switches. ..
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| Clicks: 17370 | Votes: 1 | Comments: 0 | Rating: 8 | Rank: 5
Simple humidity detector
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The main (and only) job of this circuit is to activate a buzzer or a relay, each time the level of humidity takes a specific value. Main stage is a memory based on a flip-flop consisting of gates and IC1a IC1 b. The output of this step activates an oscillator (IC1c), which in turn leads to a piezoelectric speaker. At the start of operation of the circuit, the flip-flop is driven to logical '0' or through the C1 or through C2. From the moment you excited, the reintroduction of the peace achieved through the switch S1, which however is insufficient if the sensor 82 continues to be wet...
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| Clicks: 9388 | Votes: 1 | Comments: 0 | Rating: 7 | Rank: 4
Lighting auto controller
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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 mounted switch ON / OFF the lamp. Setting the switch to ON, the lamp will light after about 400 msec, a delay is probably negligible. But when the state enters the ON OFF, then mesolathei a period of 20 sec, the brightness of the lamp remains unchanged to start falling out soon after. ..
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| Clicks: 3248 | Votes: 1 | Comments: 0 | Rating: 7 | Rank: 6
Infrared approach detector / sensor
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Basic operation of the monitor attached to the circuit is to detect objects (obstacles), at distances ranging from a few millimeters to and a few centimeters. Depending circuits used in industry and hospitals. The position sensor IC2 optoapomonotis used a type of Siemens SFH900 someone similar. The sign shows, led to a phase locked circuit (contained in IC1), which compares with signal frequency an oscillator which is also located within the same chip. For as long as the frequencies of two signals coincide, the pin output of IC1 (pin 8) is still reasonable 'O'. ..
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| Clicks: 2155 | Votes: 1 | Comments: 0 | Rating: 6 | Rank: 6
PIC16CS4 Programmer
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Most of you will certainly already installed on your computer one of the many software tools move freely from hand to hand and is suitable for programming the PIC 16C84. One of the most popular of this kind is the RIR02 of Silicon Studios. The circuit described below, is perhaps the simplest PIC programmer that can work seamlessly with the program RIR02. This guide allows RIR02 communication with the programmer, through the parallel port (Centronics). ..
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| Clicks: 9227 | Votes: 3 | Comments: 0 | Rating: 7 | Rank: 5
Multi-color LED driver
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Have you ever wondered how many different colors can illuminate a LED? One, two or maybe three? Constructing this simple circuit, you will find it much more. The key component in this design is a dual LED. One such accessory includes two inside the 'slices' of different diode LED, that each of them produces a different color (usually green and red). For the drive requires three pins, a common cathode and two separate roots. In this way each of the two integrated diodes can light up as independent of each other. There are only two colors that can produce this dual LED. ..
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| Clicks: 1307 | Votes: 1 | Comments: 0 | Rating: 6 | Rank: 4
Automatic switch for batteries
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Nowadays the batteries are gaining more and more power, being the only components that fail to provide energy for portable electronic devices. The evolution is rapid, leading manufacturers electronic equipment to attempt to minimize the consumption of their products so that they can operate for several hours using simple batteries trade. In spite of the efforts of manufacturers, the device will absorb a zero power not yet invented. Thus, both small and if the current device is mathematically certain that at some point, after a few hours, days or ethdomades, the battery-drain '. The purpose of the circuit will describe below, is to keep 'alive' batteries for the maximum time, minimizing unnecessary consumption...
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| Clicks: 12383 | Votes: 1 | Comments: 0 | Rating: 8 | Rank: 3
Mono audio panoramic interference (pan pot)
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The circuit spectator interference enables implantation mono sound at any point between stereo speakers. When P1 is in the middle of his journey, there is strengthening or weakening of the mark the entrance to the exit in any of the two channels. When the potentiometer placed elsewhere, away from halfway, the signal in one channel is supported 3dB more than the other. The input stage is a buffer (IC1). Inverts the input signal to ensure compliance with this phase of the output (Next steps' and reverse them the signal they receive to entry). The resistance value entry identifies to that of R 1 (1 A KO). The output buffer is driven in stereo amplifiers IC2 and IC3...
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| Clicks: 173 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 2
Modem shutdown Indicator
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The circuit has been designed to accommodate all those who dedicate many hours of their lives by exploring the endless pages of this site. Despite the fact that it consists of only three components (Most were not little!), Is able to provide an indication of whether it actually released the telephone line after a long connection via modem to the network. This can be particularly useful, since there In many cases, the computer claims that the telephone network connection has been interrupted, but the modem for some reason keeps the line engaged...
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| Clicks: 16187 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 6
Temperature measurement using two cables
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In those cases we want to measure the temperature in an area far from where it is. The imaging unit installed, you should find some way to connect the latter with the necessary sensor. The cables we use most often will have three two conductors for power sensor and one more to carry the signal representing the temperature. But it may have only two, assuming that one will carry the potential of land and the second supply voltage with the signal temperature. This is possible if used as sensors or the LM334 or the LM335. The disadvantage arises but with them is that the temperature display is provided for reference the
absolute zero (Kelvin scale), which most often is not as convenient as we would like. If so the issue is a signal proportional to the temperature scale Celsius which in everyday life, you should use a different sensor, such as the LM45. ..
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| Clicks: 6867 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 2
Low Power Voltage Reference
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The voltage reference circuit described below, is a special implementation of current source LM334. Characterized by a very small temperature coefficient metatholio output voltage and consumes only 10uA room temperature. This current fluctuates by a few uA, when the ambient temperature varies significantly. The positive rate of temperature change LM334 offset by the negative of the contact base emitter transistors has a direct thermal coupling with the integrated. To achieve the lowest possible temperature coefficient, it is necessary to adjust the output voltage of 1,253 V source to the arrangement easily done through R1. ..
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| Clicks: 6062 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 3
Electrical isolation for the I2C bus with optocouplers
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When the lines SDA (Serial DAta) and SDA 'are logical '1', the circuit is at rest with the result that optocouplers IC 1 and IC2 can not convey absolutely no information. But once the SDA line become the 'O', then the LED the IC 1 becomes conductive through the resistor R2. At that time the line SDA 'and it becomes reasonable' O 'because of conductivity of the transistor of IC 1 and D2. This logic state remains on the right side of the channel. After the LED of IC2 can not properly polarized, and therefore unable to transfer back to the left. In this way, ensure that the circuit will never be 'stuck' to logical 'O'. As you noticed, the circuit is symmetrical. ..
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| Clicks: 14512 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 2
Dual supply for audio amplifiers
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Most amps acoustic frequencies that make our readers, instead of a transformer power, sometimes required two or sometimes three. This tactic is more common in amplifiers 'High-End', where the altar of high fidelity are all eager to sacrifice their economies. In these cases the primary, all connected to the network of 220V, paralleled each other yet, through a single security, the nearest outlet. The problem that arises in such a connection is related with as such security. If the amplifier has two transformers, then the defendant one of them leads by one channel (or more generally a set of circuits), and if available, and a third, he'll have as sole purpose supplying circuit protection and control of others...
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| Clicks: 2101 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 2
Low energy consumption audio signal generator
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On those occasions when we want to see if an amp works, the best tool we can use is a source of acoustic signal with a frequency around the 1 kHz. These characteristics can be merely 'tolerated', because in cases of rapid tests rarely consider whether the amplifier is quality. We need only find that it works So, the deformation of the generator is a parameter without
irrelevant, giving way to another more important: consumption. The design of the circuit discussed below has been done so that the generator is to fulfill the above requirements. ..
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| Clicks: 18699 | Votes: 0 | Comments: 0 | Rating: 0 | Rank: 3
DC to DC converter electronic schematic
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Those of you who frequently use devices that work on battery or you need a negative trend at the moment you have a single positive, will definitely look for a converter like the one described below. Constructing it, you can convert a positive voltage of a battery of 9 V to negative using well known integrated 555. The same circuit can also be used in cases those requiring two symmetrical lines of power, when available a single battery. The integrated TLC555 is the old bipolar NE555, manufactured with technology but CMOS. Unless you have this type of integrated, you might as well use an 7555. In this construction, the TLC555 is syndesmologimeno arranged in a ground unstable...
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