Showing posts with label high. Show all posts
Showing posts with label high. Show all posts
Thursday, November 6, 2014
RF detector circuit for High Frequency
Often we need to see which is ideal for the placement of an antenna, a transmitter or other device for high frequency where its signal can reach and where it leaves point. For this we can use a detector circuit, also called the sniffer, which is tuned to the operating frequency of the desired system. This detector is described in this article is very simple to operate and do, just uses two diodes and two transistors and a half dozen passive components, their frequency of detection is around 2.2Ghz and its sensitivity is pretty good.
![]( "RF")
Its operation is simple, the transistors Q1 and Q2 are BFS17 are being used with RF amplifiers. LED1 can be replaced by a VU to have greater precision in signal check. The circuit has a very broad frequency tuned, it will capture RF signals from microwaves, cell phones, WIFI, etc.. I believe that the transistor can be replaced by BFS17 BRF92 or BFG591, which are easier to find here.
RF detector circuit for High Frequency
Its operation is simple, the transistors Q1 and Q2 are BFS17 are being used with RF amplifiers. LED1 can be replaced by a VU to have greater precision in signal check. The circuit has a very broad frequency tuned, it will capture RF signals from microwaves, cell phones, WIFI, etc.. I believe that the transistor can be replaced by BFS17 BRF92 or BFG591, which are easier to find here.
Detector RF High Frequency
The circuit must be mounted in a metal box to minimize capacitive effects of hand and other external interference, only the antenna must be out of caixa.Para test the detector, as you approach a signal source, the 1 LED gets brighter. The simplicity of the circuit, for sure it will capture unwanted signals, especially harmonics powerful transmitters, but is still reliable equipment.
Tuesday, October 28, 2014
Mosfet High Power Amplifier complete PCB
 |
| Amplifier circuit is finished, and ready for use. |
 |
| 1000W High Power Amplifier with Mosfet Circuit Schematic Diagram |
 |
| PCB design for this Amplifier Circuit |
Sunday, October 26, 2014
5000W High Power Amplifier Audio Circuits
The High Power Amplifier has great advantages are 5000W ultra-light, high-power audio amplifier, without switching-mode power supply. This ambit is of an 2 x 2,500W RMS Stereo amplifier, super-light and after switching-mode ability supply. The ambit aloof shows a channel, and the ability accumulation that it assists to the two channels. The audio ambit should be duplicated, but the ability accumulation assists to the two channels after problems.
 |
| Click To view larger | 5000W High Power Amplifier Audio Circuits Diagrams |
A adapted affliction should be destined to the careful agent of the audio line, that should be of audio-high-quality, of the blazon acclimated in microphone pre amps ascribe line. The accomplished accumulation (2 channels) of 5,000W RMS it should not counterbalance added than 32 lbs, already central of an adapted brownish box.
WARNING:
This ambit is alone for abecedarian use. It contains not-isolated genitalia of the electric AC net and it can be actual dangerous. The access for the speakers are not abandoned of the calm AC net and it requests added care. This action seeks to acting a accepted ability accumulation with abundant weight and amount reduction, after necessarily to use a switching-mode ability supply.
This action cannot be accustomed in some countries for commercial-use. The columnist doesn’t accept any albatross for the anatomy as that ambit it will be applied.
Saturday, October 25, 2014
LM741 Active high pass filter circuit
This is active high pass filter circuit for 327Hz frequency using LM741. It will use to build Harmonic at 3 of 130.81 frequency have the value at least. More than the frequency Fundamental 30 dB, for output be sawtooth wave form for use in sound of music way system Electronic design will use the circuit filters three rank frequency. By have 3 dB you slopes can use Op-amp IC number LM741 or number LF351it will meet the frequency well.
Monday, October 20, 2014
Making High Quality iPod iPhone Speakers
This high quality and low cost speaker was designed to be used for iPod or iPhone with the use of old car Hi-Fi speaker and some computer components. Other materials used are shown in the image below and they include an amplifier, 240V-12V power supply, tweeters, crossovers, sealed lead acid battery, MDF, filler, Apple universal dock & remote, glue, nails, and white gloss paint.
The front baffle board was drawn on a piece of MDF in order to use it as a template to make the rear of the box. The dimensions of the box based on the speaker do not necessarily need to be exact because the speakers were quite old as it comes from an old Renault 19.
From the photo of the round bits below, the trusty circular saw was used to cut loads of 1 inch by 15 cm strips of MDF. Between the front and rear baffle, the strips were glued and nailed. The baffles were cut out using a jigsaw and the strips were kept as close to each other as possible.
The first coat of filler can take 3 batches to finish and they were applied as neatly as it can after being mixed up. Until it was somewhere near as shown below, a few more coats can be applied. A surform will be applied until it was about the right shape once the first coat of filler had set. Sanding could be done by hand or it would be better to use an electric sander if available. A jigsaw was used to cut out the speaker and tweeter holes as shown below and a flange for the speaker to sit into was made using the router.
A hole of about 12mm on the top and 3mm on the back were drilled once all the holes were cut. The edges were masked up and the baffle was spray painted in matt black as shown below. The first layer of white primer can be applied once the black was dry and the masking tape was removed. A couple of coats of normal white primer was applied and then followed by a light sand. In between, a bit of sanding was applied as 3 coats of white gloss were given.
A grill for the front had to be made for the full fake Apple. To mark out the shape on a scrap bit of 5mm laminate flooring, this was a simple matter of using the box as a template and then sprayed it in matt black. Some black nylon cloth was glued onto the panel with some spray carpet adhesive when the paint was dry as shown in the image below.
Some black drywall screws were used to screw the 13cm speaker into the box as well as the amp and crossover networks and epoxy resin was used to glue the tweeters. After soldering all the connections, the lead acid battery was glued inside as shown in the next image. The amp of the battery was powered by wiring the 12V to the battery. The iPod universal dock was glued on the top of the box with wires for USB and audio. The finished product of cool looking iPod speaker is also shown below.
The front baffle board was drawn on a piece of MDF in order to use it as a template to make the rear of the box. The dimensions of the box based on the speaker do not necessarily need to be exact because the speakers were quite old as it comes from an old Renault 19.
From the photo of the round bits below, the trusty circular saw was used to cut loads of 1 inch by 15 cm strips of MDF. Between the front and rear baffle, the strips were glued and nailed. The baffles were cut out using a jigsaw and the strips were kept as close to each other as possible.
The first coat of filler can take 3 batches to finish and they were applied as neatly as it can after being mixed up. Until it was somewhere near as shown below, a few more coats can be applied. A surform will be applied until it was about the right shape once the first coat of filler had set. Sanding could be done by hand or it would be better to use an electric sander if available. A jigsaw was used to cut out the speaker and tweeter holes as shown below and a flange for the speaker to sit into was made using the router.
A hole of about 12mm on the top and 3mm on the back were drilled once all the holes were cut. The edges were masked up and the baffle was spray painted in matt black as shown below. The first layer of white primer can be applied once the black was dry and the masking tape was removed. A couple of coats of normal white primer was applied and then followed by a light sand. In between, a bit of sanding was applied as 3 coats of white gloss were given.
A grill for the front had to be made for the full fake Apple. To mark out the shape on a scrap bit of 5mm laminate flooring, this was a simple matter of using the box as a template and then sprayed it in matt black. Some black nylon cloth was glued onto the panel with some spray carpet adhesive when the paint was dry as shown in the image below.
Some black drywall screws were used to screw the 13cm speaker into the box as well as the amp and crossover networks and epoxy resin was used to glue the tweeters. After soldering all the connections, the lead acid battery was glued inside as shown in the next image. The amp of the battery was powered by wiring the 12V to the battery. The iPod universal dock was glued on the top of the box with wires for USB and audio. The finished product of cool looking iPod speaker is also shown below.
Saturday, October 11, 2014
Flasher with LED high Intensity Circuit Diagram
This Flasher with LED high Intensity Circuit Diagram was designed as a flasher warning and was originally mounted on a bicycle. White LEDs are only recommended if the circuit is used as a bicycle front light and red LEDs only when used as a taillight. During the day, the two solar cells carry two 1.6 V AA batteries. In the darkness, the cell voltage disappears solar energy and batteries are automatically diverted to the circuit. The frequency of blinking (flashing) is about one per second.
Flasher with LED high Intensity Circuit Diagram
If you liked this article,Take a few Seconds to Share this and leave comments
Saturday, September 20, 2014
High Low Voltage Cutout Without Timer
This inexpensive circuit can be connected to an air-conditioner/fridge or to any other sophisticated electrical appliance for its protection. Generally, costly voltage stabilizers are used with such appliances for maintaining constant AC voltage. However, due to fluctuations in AC mains supply, a regular ‘click’ sound in the relays is heard. The frequent energisation/de-energisation of the relays leads to electrical noise and shortening of the life of electrical appliances and the relay/stabilizer itself. The costly yet fault-prone stabiliser may be replaced by this inexpensive high-low cutout circuit with timer.
The circuit is so designed that relay RL1 gets energised when the mains voltage is above 270V. This causes resistor R8 to be inserted in series with the load and thereby dropping most of the voltage across it and limiting the current through the appliance to a very low value. If the input AC mains is less than 180 volts or so, the low-voltage cut-off circuit interrupts the supply to the electrical appliance due to energisation of relay RL2. After a preset time delay of one minute (adjustable), it automatically tries again. If the input AC mains supply is still low, the power to the appliance is again interrupted for another one minute, and so on, until the mains supply comes within limits (>180V AC).
Circuit diagram:
The AC mains supply is resumed to appliance only when it is above the lower limit. When the input AC mains increases beyond 270 volts, preset VR1 is adjusted such that transistor T1 conducts and relay RL1 energises and resistance R8 gets connected in series with the electrical appliance. This 10-kilo-ohm, 20W resistor produces a voltage drop of approximately 200V, with the fridge as load. The value and wattage of resistor R8 may be suitably chosen according to the electrical appliance to be used. It is practically observed that after continuous use, the value of resistor R8 changes with time, due to heating. So adjustment of preset VR1 is needed two to three times in the beginning.
But once it attains a constant value, no further adjustment is required. This is the only adjustment required in the beginning, which is done using a variac. Further, the base voltage of transistor T2 is adjusted with the help of preset VR2 so that it conducts up to the lower limit of the input supply and cuts off when the input supply is less than this limit (say, 180V). As a result, transistor T3 remains cut off (with its collector remaining high) until the mains supply falls below the lower limit, causing its collector voltage to fall. The collector of transistor T3 is connected to the trigger point (pin 2) of IC1. When the input is more than the lower limit, pin 2 of IC1 is nearly at +Vcc.
In this condition the output of IC1 is low, relay RL2 is de-energised and power is supplied to the appliance through the N/C terminals of relay RL2. If the mains supply is less than the lower limit, pin 2 of IC1 becomes momentarily low (nearly ground potential) and thus the output of IC1 changes state from ‘low’ to ‘high’, resulting in energisation of relay RL2. As a result, power to the load/appliance is cut off. Now, capacitor C2 starts charging through resistor R6 and preset VR3. When the capacitor charges to (2/3)Vcc, IC1 changes state from ‘high’ to ‘low’. The value of preset VR3 may be so adjusted that it takes about one minute (or as desired) to charge capacitor C1 to (2/3)Vcc.
Relay is now de-energised and the power is supplied to the appliance if the mains supply voltage has risen above the lower cut-off limit, otherwise the next cycle repeats automatically. One additional advantage of this circuit is that both relays are de-energised when the input AC mains voltage lies within the specified limit and the normal supply is extended to the appliance via the N/C contacts of both relays.
Read More..
The circuit is so designed that relay RL1 gets energised when the mains voltage is above 270V. This causes resistor R8 to be inserted in series with the load and thereby dropping most of the voltage across it and limiting the current through the appliance to a very low value. If the input AC mains is less than 180 volts or so, the low-voltage cut-off circuit interrupts the supply to the electrical appliance due to energisation of relay RL2. After a preset time delay of one minute (adjustable), it automatically tries again. If the input AC mains supply is still low, the power to the appliance is again interrupted for another one minute, and so on, until the mains supply comes within limits (>180V AC).
Circuit diagram:
The AC mains supply is resumed to appliance only when it is above the lower limit. When the input AC mains increases beyond 270 volts, preset VR1 is adjusted such that transistor T1 conducts and relay RL1 energises and resistance R8 gets connected in series with the electrical appliance. This 10-kilo-ohm, 20W resistor produces a voltage drop of approximately 200V, with the fridge as load. The value and wattage of resistor R8 may be suitably chosen according to the electrical appliance to be used. It is practically observed that after continuous use, the value of resistor R8 changes with time, due to heating. So adjustment of preset VR1 is needed two to three times in the beginning.
But once it attains a constant value, no further adjustment is required. This is the only adjustment required in the beginning, which is done using a variac. Further, the base voltage of transistor T2 is adjusted with the help of preset VR2 so that it conducts up to the lower limit of the input supply and cuts off when the input supply is less than this limit (say, 180V). As a result, transistor T3 remains cut off (with its collector remaining high) until the mains supply falls below the lower limit, causing its collector voltage to fall. The collector of transistor T3 is connected to the trigger point (pin 2) of IC1. When the input is more than the lower limit, pin 2 of IC1 is nearly at +Vcc.
In this condition the output of IC1 is low, relay RL2 is de-energised and power is supplied to the appliance through the N/C terminals of relay RL2. If the mains supply is less than the lower limit, pin 2 of IC1 becomes momentarily low (nearly ground potential) and thus the output of IC1 changes state from ‘low’ to ‘high’, resulting in energisation of relay RL2. As a result, power to the load/appliance is cut off. Now, capacitor C2 starts charging through resistor R6 and preset VR3. When the capacitor charges to (2/3)Vcc, IC1 changes state from ‘high’ to ‘low’. The value of preset VR3 may be so adjusted that it takes about one minute (or as desired) to charge capacitor C1 to (2/3)Vcc.
Relay is now de-energised and the power is supplied to the appliance if the mains supply voltage has risen above the lower cut-off limit, otherwise the next cycle repeats automatically. One additional advantage of this circuit is that both relays are de-energised when the input AC mains voltage lies within the specified limit and the normal supply is extended to the appliance via the N/C contacts of both relays.
Thursday, September 18, 2014
Simple 4A High Speed Low Side Gate Driver
The UCC27518 and UCC27519 single-channel, high-speed, low-side gate driver device is capable of effectively driving MOSFET and IGBT power switches. Using a design that inherently minimizes shoot-through current, UCC27518 and UCC27519 are capable of sourcing and sinking high, peak-current pulses into capacitive loads offering rail-to-rail drive capability and extremely small propagation delay typically 17 ns.
The UCC27518 and UCC27519 provide 4-A source, 4-A sink (symmetrical drive) peak-drive current capability at VDD = 12 V. The UCC27518 and UCC27519 are designed to operate over a wide VDD range of 4.5 V to 18 V and wide temperature range of -40°C to 140°C. Internal Under Voltage Lockout (UVLO) circuitry on VDD pin holds output low outside VDD operating range.
The UCC27518 and UCC27519 provide 4-A source, 4-A sink (symmetrical drive) peak-drive current capability at VDD = 12 V. The UCC27518 and UCC27519 are designed to operate over a wide VDD range of 4.5 V to 18 V and wide temperature range of -40°C to 140°C. Internal Under Voltage Lockout (UVLO) circuitry on VDD pin holds output low outside VDD operating range.
Features
- Low-Cost, Gate-Driver Device Offering Superior Replacement of NPN and PNP Discrete Solutions
- Pin-to-Pin Compatible With TI’s TPS2828 and the TPS2829
- 4-A Peak Source and 4-A Peak Sink Symmetrical Drive
- Fast Propagation Delays (17-ns typical)
- Fast Rise and Fall Times (8-ns and 7-ns typical)
- 4.5-V to 18-V Single Supply Range
- Outputs Held Low During VDD UVLO (ensures glitch free operation at power-up and power-down)
- CMOS Input Logic Threshold (function of supply voltage with hysteresis)
- Hysteretic Logic Thresholds for High Noise Immunity
- EN Pin for Enable Function (allowed to be no connect)
- Output Held Low when Input Pins are Floating
- Input Pin Absolute Maximum Voltage Levels Not Restricted by VDD Pin Bias Supply Voltage
- Operating Temperature Range of -40°C to 140°C
- 5-Pin DBV Package (SOT-23)
Device Uses
- Switch-Mode Power Supplies
- DC-to-DC Converters
- Companion Gate Driver Devices for Digital Power Controllers
- Solar Power, Motor Control, UPS
- Gate Driver for Emerging Wide Band-Gap Power Devices (such as GaN)
Monday, September 15, 2014
LM3886 Audio Power Amplifier High Performance 68W Audio Power Amplifier
The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz. The performance of the LM3886, utilizing its Self Peak In-stantaneous Temperature (˚Ke) (SPiKe™) protection cir-cuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Op-erating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against overvoltage, undervoltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks. The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0µV. Itexhibits extremely low THD+N values of 0.03% at the rated
output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.
Wednesday, August 27, 2014
56W High Audio Amplifier Use LM3875 Wiring diagram Schematic
This is a simple 56W High Audio Amplifier Use LM3875 Circuit Diagram. The LM3875 is an audio amplifier for high power output capable of delivering 56W of continuous average power to a load 8. The performance of the LM3875, utilizing its maximum instantaneous auto temperature (° Ke) (Spike ™) protection schemary, places it in a class above discrete and hybrid amplifiers by providing a yes, dynamically protected area of safe operation (SOA). SPIKE protection means that these parts are fully protected against output overvoltage, voltage surges caused by shorts to the supplies, the peak temperature thermal runaway, and instantaneous.
56W High Audio Amplifier Use LM3875 Circuit Diagram
This amplifier schema is based on the non-inverted GainClone standard configuration. I did some calucaltions the feedback resistor and other components in order to check the gain, etc. For more background on the calculations relevant to GainClones in the background section.
Parameters IC LM3875
Output Current 6000 mA.
Offset Voltage max, 25C 10 mV.
Gain Bandwidth 8 MHz.
Supply Min 20 Volt.
Supply Max 84 Volt.
Supply Current Per Channel 30 mA.
PowerWise Rating 2 3750 uA/MHz.
Slew Rate 11 Volts/usec.
Input OutputType Not Rail to Rail.
Max Input Bias Current 1000 nA.
Special Features AvCl>10.
Function Op Amp.
Channels 1 Channels.
Temperature Min 0 deg C.
Temperature Max 70 deg C
Sourced By : Circuitsstream
Subscribe to:
Posts (Atom)
