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The project I’m going to describe today it’s a sort of proof of concept that will demonstrate the possibility to remote control sensors and actuators (for example a couple of relays) via Telegram. Telegram is an instant messaging application, similar to the famous Whatsapp. Last June, the Telegram developers announced that a new set of APIs were available to develop bots. [ ]

Most photovoltaic cells are made of silicon chip above which there resides a very thin layer of noble metal through which around 1% of photon particles enter the material and activates electron flow. Here I’m showing how to make one simple solar panel using transistor. [ ]

Occasionally you come across some unusual  situations when setting up measurement  systems. The author once had to set up a system to register the vibrations and strain supposed to be  present in a contactor that operated at a voltage of 25 kVAC. One of the biggest problems with this project turned out to be the power supply for  the measurement system. Since it required  a power of about 30 W it wasn’t possible to  use batteries since the system had to operate  for many hours at a time. A logical solution  would seem to be to use an isolating trans-former, but still.25 kVAC means a peak volt-age approaching 40 kV, and on top of that  you would have to include a safety margin. In  addition, everything that is connected to high  voltage lines should also be able to withstand  lighting strikes! Circuit diagram : Power Supply with High Voltage Isolation Circuit Diagram Consequently the isolation should be able to  cope with a test voltage of 150 kV, which is a  lot to ask of the is

The electronic circuit provides a visual time 9 second delay using ten LED before control by closing a 12 Vdc relay. That the reset switch has closed, IC 4017 decade counter will be reset to zero count which illuminates the LED driven from pin 3. IC 555 timer output at pin 3 will be high and the voltage at pins 6 and 2 of the timer will be a little less than the lower trigger point, or about 3 Vdc. 9 Sec Timer with LED Indication and Control Relay Circuit Schematic   That time the switch is opened, the transistor in parallel with the timing capacitor (22uF) is shut off allowing the capacitor to begin charging and the IC 555 timer circuit to produce an approximate one second clock signal to the decade counter. The counter advances on each positive going change at pin 14 and is enabled with pin 13 terminated low. When the 9th count is reached, pin 11 and 13 will be high, stopping the counter and energizing the relay. Longer delay times can be obtained with most capacitor or most resistor

Power Amplifier TDA7294 is a power amplifier with IC Power Amplifier is a mono 100W Class AB operation of OCL. The power supply circuit. Positive, negative, and ground. Usually, we use the power supply circuit to + /-25V to + /-35V at 100W RMS will be used to heat sufficiently. After many members have already made the TDA7294 as I know, with a sound quality that is the very gods or Hi-End itself. Several days before the member’s PM to me saying that I had an amplifier using IC TDA7294 to have more of the same. Higher power. And low heat. Achieved by increasing the voltage raising circuit For the more, it means high power and high heat up. Today I have come across. I use IC TDA7294 circuit at the time. In-Home Use amplifier circuit is a Class G amplifier with low power consumption, resulting in the loss of a 20V DC power less. And when you’re driving a high-power random access is party to a rhythm. Principles to do it. I took out a membership you can do is try to build up a bit. We pro

Tone control circuit is used to adjust the tones before entering the amplifier. Tone control over equipped with a loudness and filter directly without using the switch to disconnected or connected. Part of his filter that is C1 and R1 from ground to input , and for his loudness on the R4 and C3 are connected to the input and then go to VR1. C2 and R3 go from ground to the input . After the input is set by volume or VR1 then procesed again by treebel ie C8 , R13 , R14 , and VR2 . Bass on R10 , R11, R12 , C7 ,C8 , and VR3. For supply voltages has been given a stabilization in Q3. See schematic below : Click to view larger Part list : R1 = 100K R2 = 50K trim R3 = 22K R4 = 15K R5 = 1K R6 = 4K7 R7 = 330K R8 = 330K R9 = 3K3 R10= 5K6 R11= 8K2 R12= 5K6 R13= 1K R14= 1K R15= 50K TRIM R16= 50K TRIM R17= 330K R18= 4K7 R19= 47K R20= 1K R21= 4K7 R22= 2K2 R23= 100R R24= 22K C1 = 15n C2 = 15n C3 = 560p C4 = 4u7 C5 = 33u C6 = 4n7 C7 = 39n C8 = 39n C9 = 4u7 C10=4u7 C11=470u C12=100u Q1 = C1815 Q2 = C828

Simple Active Crossover Circuit Diagram with TL074 . An audio source, like a mixer, preamp, EQ, or a recorder, is fed to the input of the Electronic Crossover Circuit. This signal is either AC or coupling, depending on the setting of switch 51, the non-inverting input of buffer amplifier Ul-a, a section of a quad BIFET, low amp TL074 noise made by Texas Instruments op.  This stage has a gain of 2, and its output is distributed to both a low pass filter made by R4, R5, C2, C3, and Uld op-amp, and a high-pass filter made by R6, R7, C4, C5, and op amp ULC. These are12 dB / octave Butter worth filters. The response of the Butter worth filter was chosen because it gives the best compromise between the damping and phase.   Active Crossover Circuit Diagram with TL074 The values of capacitors and resistors varies depending on the selected connection that your device works. The filter outputs are fed to a balancing network made by R8, R9, RIO, R14 and potentiometer RLL balance. When the potenti

This circuit operate with IC AN7156N . You just can use this IC , because hav'nt similarity it. In this Circuit have 2 input IN R and IN L and have Output R and L . Voltage supply require 15 V , minimum voltage 9 V and maximum voltage 24V . And the voltage must DC voltage , and better the DC voltage filtering . Maximum Output for 1 speaker 25 W , so this circuit have maximum output 2 X 25 W with minimum impedance 4 ohm. See this circuit schematic below : Click image to view enlarge

Stereo Car Audio Amplifier with TDA1553CQ

This circuit is used to drives relays of 24 and 18 VDC from a 12 Volt power supply. The basic circuit on the IC NE 555 timer and use this circuit with almost any NPN or PNP power transistor. Parts: Resistor R1 = 47K R2 = 10K R3 = 56R Capacitor C1 = 0.01uF C2 = 0.01uF C3 = 0.001uF C4 = 0.1uF C5 = 50uF Transistor Q1 = TIP29 , TIP120, 2N4922, TIP61, TIP110, or 2N4921 Q2 = TIP30 , TIP125, 2N4919, TIP62, TIP115, or 2N4918 IC U1 = NE555

This is a circuit for a battery charger with automatic overload protection feature . The power supply is 9V and is stabilized by a voltage regulator IC LM317 . The regulator output is used to charge the 6V battery . Once the battery is fully charged (ie the voltage across the battery is 6V ) enters the zener diode biased and starts conducting , which gives a positive voltage to the base terminal of BC548   loading.  Battery Charger with Protection Circuit Diagram

This doorbell system works such that when someone presses your calling bell switch during the night, not only the bell rings but the bulb connected to it also glows. In order to turn the bulb off, just press the reset pushbutton switch provided in the circuit. Place the bulb near the calling bell switch so that you can see the person pressing the calling bell before opening the door. So you can choose not to open the door to doubtful persons. During day time, the bulb doesn’t glow and only the calling bell sounds.  Doorbell with Security Feature Circuit Diagram When calling bell switch S1 is closed, the bell rings and simultaneously transformer X gets AC supply. The output of this 6V-0V-6V/500mA step-down transformer is rectified by diodes D1 and D2. The rectified output is filtered by 1000µF, 25V capacitor C1 and fed to the collector of transistor BC547 (T1) via 2.2k resistor R1. A light-dependent resistor (LDR) is connected to the base of this transistor. During the day, the LDR has

The TS4962 is a differential class-D BTL power Amplifier It is able to drive up to 2. 2W into a 4, load and 1. 4W into a 8, load at 5V. It achieves outstanding efficiency (88% typ. ) compared to standard AB-class Audio amps. By STMicroelectronics visit page. via next.gr Stereo Audio Amplifier System With I2C Bus Interface

The Power supply circuit suitable with high power amplifier is well designed for large power amplifier circuit and amplifier circuit also requires protection quickly enough so as not to damage because of the power supply is less than the maximum performance or because of a short-circuit on a series of power supply and amplifier. Power supply circuit suitable with high power amplifier is equipped with a fuse, with earth protective chassis. So save on the amplifier and voltage shock to the chassis. In addition to the Power supply circuit suitable with high power amplifier the hum of voices issued almost non-existent because of the high frequency transformer has been issued because of grounded disappeared. In a multichannel amplifier, power supply will fell into one of three types. In order rising costs, and expected decreases the interaction between the channels, namely: 1. Transformer, rectifiers, and reservoir capacitors are shared between channels. 2. Each channel has its own transf

This is mono circuit tone control , include adjusting bass , trebel , and master volume. Minimum voltage require 15 volt and maximum voltage 45 volts.See schematic and construction below :

Google has released a standalone version of its stock camera app for Android— and it's a significant improvement on its predecessor. The new app, called simply Google Camera, features a new user interface with revamped shooting modes, as well as the ability to selectively focus the camera. Rumors of the new app first surfaced earlier this month after it was reported the company was testing a new camera app that would be released independently of the upcoming Android 4.4.3 update. Google also unveiled Lens Blur, a brand new effect that enables users to shoot with a shallower depth of field to selectively focus on certain portions of a particular image. This is the first time Google has included the feature in its camera app. "Achieving this optical effect has traditionally required a big lens and aperture, and therefore hasn’t been possible using the camera on your mobile phone or tablet," wrote Google software Engineer Carlos Hernandez in a blog post explaining how Google

For a collector follower with emitter resistor, you’ll often find that the gain per stage is no more than 10 to 50 times. The gain increases when the emitter resistor is omitted. Unfortunately, the distortion also increases. With a ubiquitous transistor such as the BC547B, the gain of the transistor is roughly equal to 40 times the collector current (Ic), provided the collector current is less than a few milliamps. This value is in theory equal to the expression q/KT, where q is the charge of the electron, K is Boltzmann’s constant and T is the temperature in Kelvin. For simplicity, and assuming room temperature, we round this value to 40. For a single stage amplifier circuit with grounded emitter it holds that the gain Uout /Uin (for AC voltage) is in theory equal to SRc. As we observed before, the slope S is about 40Ic. From this follows that the gain is approximately equal to 40I cRc. What does this mean? In the first instance this leads to a very practical rule of thumb: that gai

Automatic Day-Night Lamp wit LDR Maybe it's a lot who know how to work this one series, but I wanted to share back to the beginner on this. In the existing lighting circuit automatic lights that use components LDR (Light Dependence Resistor). The workings of LDR LDR is exposed to light if the layer of the resistance was weakened likewise if there is no light at all resistance enlarged. here could make friends like that, because its components are a little easy but we will use the 220V AC voltage of course you must be very careful. Rather than actually being burnt. The author asks to be careful for the beginner course. Schematic LDR LDR components can be interconnected with a cable, so tools stay in the house but LDR is outside the home. It is recommended using qualified Relay no1 to avoid fire, because the relays are cheap to produce heat. Relay that cheap is not in use for high voltage. Travonya use the cheap, because this circuit does not require large currents. The function of P

Welcome to free circuit dot com,today We have a circuit for audio amplifier. We found the circuit in my electronic book,This amplifier power spec is 600W with stereo system. I’m say a fantatic audio amplifier circuit with completely sound and popular using. This circuit take high quality electronic components with pair power amp good function and PCB has not bug. Managing heat of transistor power with light heatsink that guarantee is not over heat.   Teacnical information 1.Input section responsibility =1.43 RMS 2.Power of amplifier = 600+600W at 85Volt 3.Input Impedance 85000 ohms. 4.THD less than 0.008% at 20 Watts 1000Hz 5.Frequency responsibility 0.3dB at 20Hz and 20KHz 6.Hum and noise less then 177dB 120Hz-20KHz  Sure!,We have provide schenmetic,PCB and electronic part list for your build it.  Click On Image And Zoom And Picture below is electronic part list of this circuit

The circuit described here is mostly aimed at development engineers who are looking for an economical step-down converter which offers a wide input voltage range. As a rule this type of circuit employs a step-down converter with integrated switching element. However, by using a more discrete solution it is possible to reduce the total cost of the step-down converter, especially when manufacturing in quantity. The TL5001A is a low-cost PWM controller which is ideal for this project. The input voltage range for the step-down converter described here is from 8 V to 30 V, with an output voltage of 5 V and a maximum output current of 1.5 A. Low-Cost Step-Down Converter With Wide Input Voltage Range Circuit Diagram When the input voltage is applied the PWM output of IC1 is enabled, taking one end of the voltage divider formed by R1 and R2 to ground potential. The current through the voltage divider will then be at most 25 mA: this value is obtained by dividing the maximum input voltage (30 V