Mutchus

This is 0-24VDC digital PIC power supply circuit. This variable power supply controlled with PIC microcontroller. There is LCD display in this circuit which will show the actual value of power supply output. This power supply use push on switch to adjust the output voltage and current value. Schematic Diagram: Component List : C1 = 2000uF per AMP, 40V (adjust capacity to power supply amps) C2,C3,C12,C15,C18,C21 = 0.1uF CER C4 = 0.01uF CER C5A,C5B,C5C,C5D = 0.01uF CER C6,C7 = 0.05uF CER C8 = Not used C9,C11,C19,C20 = 1uF CER C10 = 470uF 15V EL RADIAL C13 = 4.7µF 50V EL RADIAL C14 = 0.001uF CER C16,C17 = 22pF CER D1,D2,D4,D5 = 1N4148 D3 = 1N4004 Br1 = 1<10A BRIDGE RECTIFIER (adjust seize to power supply amps) DZ1 = 1N4751 30V ZENER IC1 = LM317KCS TO220 IC2 = LM337LZ TO92 IC3 = LT1491CN special HV opamp, do not substitute IC4 = PIC16F876A Q1 = 2N3906 Q2A to Q2D = TIP142TU 1 to 5 transistors (adjust quantity to power supply amps) Q3A to Q3D = 2N3904 (adjust quantity to power supply am...

A digital dice circuit can be easily realised using an astable oscillator circuit followed by a counter, display driver and a display. Here we have used a timer NE555 as an astable oscillator with a frequency of about 100 Hz. Decade counter IC CD4026 or CD4033 (which-ever available) can be used as counter-cum-display driver. When using CD4026, pin 14 (cascading output) is to be left unused (open), but in case of CD4033, pin 14 serves as lamp test pin and the same is to be grounded. Circuit diagram : Digital Dice With 7-Segment Display Circuit diagram The circuit uses only a handful of components. Its power consumption is also quite low because of use of CMOS ICs, and hence it is well suited for battery operation. In this circuit two tactile switches S1 and S2 have been pro-vided. While switch S2 is used for initial resetting of the display to ‘0,’ depression of S1 simulates throwing of the dice by a player.  When battery is connected to the circuit, the counter and display section...

Who never used a multimeter Chinese yellowing that shoot the first resistor! Despite being heavily criticized, this multimeter is identical to any other, is a lightweight tool, compact, inexpensive and reliable. It has as main component IC 7106, which is an analog to digital converter, with output to liquid crystal display (LCD) 3 and 1/2 Digits.  The Marcelino (which may have other colors), has several brands and models, but his real name is 830, there are versions without the test transistors, there are also variants with signal generator 50Hz, thermometer, continuity test with back-light, etc. This multimeter can measure DC Volts 0.1 mV to 1000V, AC Volts 0.1V to 750V, Ampere DC 0.1 mA to 10A, Ohm 0.1 Ω to 2MΩ, diode and hFE for bipolar PNP transistors and NPN. Basic scheme of Digital Multimeter circuit diagram  

Digital Echo Processor IC PT2399 is using CMOS technology in audio purposes. Digital Echo Processor PT2399 is implementing the system in the process of ADC and DAC audio repro echo. Digital Echo Processor PT2399 has a high sampling frequency and 44K memory. Digital Echo Processor PT2399 to repro echo digital audio system of repro VCO delay time system that can be arranged. Digital Echo Processor PT2399 has a very low audio distortion of (THD <0.5%) and very low noise as well (No <-90dBV) so that the Digital Echo Processor PT2399 is capable of providing good audio quality. Digital Echo Schematics Description: Setting the external resistor from 10 K Ohm to 50 K Ohm. If the value is greater then the Delay Time also increases. Echo Digital Application Processor PT2399 Video Tape Recorder Video Compact Disk Television CD Player Car Stereo KARAOKE Mixer Electronic Musical Echo Audio Processor

Build a Simple Digital Electronic Lock Circuit Diagram . This is a Build a Simple Digital Electronic Lock Circuit Diagram . The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys are depressed in the correct order, the counter will advance. Simple Digital Electronic Lock Circuit Diagram As each correct key is pressed, a low level appears at the output of the dual NAND gate producing a high level at the output of the 8 input NAND at pin 13. The momentary high level from pin 13 activates a one shot circuit which applies an approximate 80 millisecond positive going pulse to the clock line (pin 14) of the decade counter which advances it one count on the rising edge. A second monostable, one shot circuit is used to generate an approximate 40 millisecond positive going pulse which is applied...

Build a Electronic Thermometer Circuit Diagram. A thermometer thermos , meaning "hot" and  metron, "measure") is a device that measures temperature or temperature gradient using a variety of different principles. A thermometer has two important elements: the temperature sensor in which some physical change occurs with temperature, plus some means of converting this physical change into a numerical value.  An inexpensive electronic thermometer is capable of measuring temperatures over a range of from -30°F to +120°F. A diode-connected 2N3904 transistor used as the temperature sensor forms a voltage divider with Rl. As temperature increases, the voltage drop across the transistor changes by approximately -1.166 millivolts-per°F. As a result, the current at pin 3 of IC1, a 741 op amp with a gain of 5, decreases as the temperature measured by the sensor increases. A second 741 op amp, IC2 is configured as an inverting amplifier.  Electronic Thermometer Circuit Diagra...

The ARC was made to bridge the gap between high-end sound quality and the world of digital music. Designed as the perfect receiver and amplifier, this ultra-compact unit provides high-resolution USB audio streaming capabilities, high quality aptX Bluetooth audio and astonishingly detailed sound. For a great listening experience and immersive sound, all you need is a set of speakers and the ARC. Done.[ ]

Ham Com is a modem for almost all types of digital transmission for radio amateurs. It can be used to RTTY, ASCII, NevTex, Sitor, Amtor, Fec, CW, FSK, etc.. The modem is simple and can even be used for receiving faxes and SSTV wx-using JV-FAX software.  Modem for Digital Modes Circuits Diagram To use this modem, you need a PC with serial port, Software HamCom and radio equipment.

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 always on to separate Km. from hm. The rightmost display D1 (the least significant digit) shows hundreds meters and its dot illuminates after every 50 meters of walking. A beeper (excludable), signals each count unit, occurring every two steps. A normal step was calculated to span around 78 centimeters, thus the LED signaling 50 meters illuminates after 64 steps (or 32 operations of the mercury switch), the display indicates 100 meters after 128 steps and so on. For low battery consumption the display illuminates only on request, pushing on P2. Accidental reset of the counters is avoided because to reset the circuit both pushbuttons must be operated together. Obviously, this is not a precision meter, but its approximation degree ...

The operation of the converter is based on the weighted adding and transferring of the analogue input levels and the digital output levels. It consists of comparators and resistors. In theory, the number of bits is unlimited, but each bit needs a comparator and several coupling resistors. The diagram shows a 4-bit version. The value of the resistors must meet the following criteria: R1:R2 = 1:2; R3:R4:R5 = 1:2:4; R6:R7:R8:R9 = 1:2:4:8. The linearity of the converter depends on the degree of precision of the value of the resistors with respect to the resolution of the converter, and on the accuracy of the threshold voltage of the comparators. This threshold level must be equal, or nearly so, to half the supply voltage. Moreover, the comparators must have as low an output resistance as possible and as high an input resistance with respect to the load resistors as feasible. Any deviation from these requirements affects the linearity of the converter adversely. 4-Bit Analogue to Digital Co...

Small projects of digital electronics are an affordable option for students, teachers and parents as they do not require expensive laboratory and fully stocked. Many young people want to learn about digital electronics and build their own devices as well as work with the parts of a computer and analyze how the circuits of the digital world work, but can not do in their classrooms or at home because it is too expensive. There are several small projects that enable young people to practice the skills necessary to enter college skills, although they are more easily and used parts are readily available. Small projects of digital electronics provide affordable education for children. Jupiterimages / Photos.com / Getty Images Cell Phone Detector A mobile phone detector is a project that draws attention to the generation of the digital world. Most students now have mobile phones, thus making this type of project will be exciting for them. Once the project is completed, you can do a treasure h...

Canon has long been a leader in the world of DSLRs, but when it comes to smaller sized shooters, Canon had largely concentrated on commercially viable consumer and prosumer class digital cameras, not really treading on the mirrorless camera technology known as Micro Four Thirds which has been around for some years now. The mirrorless camera comes close to a DSLR in terms of image quality, and yet is far less bulkier in terms of size, not to mention allowing you to change a fair number of lenses (a market which is growing), making it a favorite secondary camera to many. Well, Canon has finally decided to dip their toes into this particular market, by offering the Canon EOS M digital camera which is said to deliver exceptional EOS Full HD video quality with continuous autofocus, not to mention having it accompanied by a notable and expansive range of lenses. Inspired by EOS technology, the EOS M will be able to leverage on the company’s core technologies, while distilling them down in or...

This Voltage Regulator with Shutdown Digital Circuit Diagram is very interesting, it uses an LM317 regulator circuit that allows external control in a dangerous situation to turn off the regulator output in response to the trigger. The circuit is configured to output five volts suitable for all TTL logic circuits. The selected values ​​of R1 and R2 set the output to the required 5V, R2 can be changed to other values ​​other output voltages. In unfavorable external trigger switches the transistor instantly putting R2 shorted to ground, knocking the output to zero volts.As the circuit is equipped with the function off by an external trigger, it is extremely suitable for many critical applications and for use in Arduino projects. Voltage Regulator with Shutdown Digital Circuit Diagram