Saturday, September 24, 2011

80W Power Amplifier Circuit

80W Power Amplifier Circuit circuit diagram

80W power amplifier circuit diagram based MJL4281A / MJL4302A and MJE15034 / MJE15035 power transistor. Actually the output power range is about 60W to 80W. This is an incredibly excellent amplifier. It's easy to construct, applies generally offered parts and is stable and well-performing. The diagram featured is really a full update on the original project, and even though it has a lot of similarities, is definitely a different design.



This amplifier circuit, even though extremely simple, is capable of great performance. This is not an amp to be under estimated, as the sonics are pretty good indeed, and this really is due (in part, at least) to the inherent simplicity of the diagram design. The amplifier is exceptionally quiet, and is reasonably tolerant of hard loads. It's an perfect amplifier for biamped systems, and may possibly be operated in bridge mode (BTL) in case you apply the suggested output transistors (which have the required power ratings).

Go to this 60-80W power amplifier page to get the detailed information about the circuit.
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Tuesday, September 20, 2011

50MW Audio Amplifier circuit

50MW Audio Amplifier circuit50MW Audio Amplifier circuit

The following is a small audio amplifier comparable to what you may come across a small transistor radio medium size. The input stage is biased to ensure that the power is divided equally to provide the two complimentary output transistors which are slightly biased in conduction of the diodes between the bases. A 3.three ohm used in sequence for the use of the issuers of the output transistors to stabilize the bias current that does not change significantly with temperature or several transistors and diodes.

Due to recent increases in bias voltage between the emitter and base decreases as a result of minimizing driving. Input impedance is 500 ohms and the voltage gain is approximately five to eight ohm speaker connected. The voltage swing around the speaker is 2 volts without distorting production and capacity is at the same time in the 50 milliwatt range. A high voltage provided as well as the addition of heat sinks in the output transistors would be a great source of more power. Circuit thirty milliamperes draw a supply of 9 volts.
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300W MOSFET Broadband Amplifier

300W MOSFET Broadband Amplifier300W MOSFET Broadband Amplifier Circuit

The back scheme will provide the best Motorola for any MRF141G typical application (including the functions of stabilization parasites), a power of broadband RF MOSFET put a conservative 300 watts rated through the broadcast band FM. The flange on the MRF141G be mounted on a heat sink, a copper plate 5 / 16 "thick and 6" x 8 ", which is mounted to the heat sink with 6-32 machine screws in the case that the heat sink is drilled and exploited.

CAUTION: This amplifier operates at very high energy ranges. You could receive significant RF burns if it comes in contact with open coaxial power of the amplifier. Also, if your transmitting antenna is mounted on the ceiling, and it should fly in a wind storm despite eating all the power of this amplifier, you can start a fire in certain types of roofing insulation! Be very careful with the use, installation and operation of the unit.
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Saturday, September 17, 2011

Rain Detector Circuit Using NE555

Rain Detector Circuit Using NE555Rain Detector Circuit Using NE555

Rain detector using In principle it is an astable multivibrator 555, which is prepared by IC555 with a sensor attached that can detect water. Astable multivibrator with the 555 is in the audio frequency with a frequency of 1 KHz. The use of rain detector circuit can be disupplay 555 with voltage source that is free enough as 5 to 15 VDC. In the application of rain detector circuit The use of this object 555 can be mounted engine, car and others who want to protect from rain.

Water sensor used in the rain detector circuit 555 Using this you can do yourself a PCB Degan make the path as shown in the image above or, as described from the image above is the use foil glued to a board or boards that are plastic insulation. The important principle of this sensor is to conduct electrical current very well when the surface is exposed to water even a little.
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Thursday, September 15, 2011

10 Band Graphic Equalizer Circuit

10 Band Graphic Equalizer Circuit
This 10 Band Graphic Equalizer Circuit a single chip, IC TL074 to achieve a 5-band graphic equalizer for use in systems of high fidelity audio. The 5-band graphic equalizer is true for radio-cassette player and car stereos. This unit features: low distortion, low noise, wide operating voltage range (3.5 V to 16V), low consumption (5 mA), Wide Dynamic Range (SD = 2.1Vrms/VCC = 8V) and built an amplifier input and output buffer.

The TL074 is a five-point graphic equalizer that has integrated all the functions necessary for a cochlear implant. The IC is the system of five sounds and control input and an output buffer amplifier. The following PDF contains detailed information on the wiring diagram for the 5-band graphic equalizer with a single IC / chip (BA3812L). The circuit shown in the table of works about five frequency bands: 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz.
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CMoy Headphone Amplifier Circuit

The following diagram is the circuit of CMoy headphone amplifier. Chu Moy designed a very popular headphone amplifier that’s easy to build, and it can be built small enough to fit in a pocket, power supply and all. It’s powerful enough to drive very inefficient headphones to thunderous volumes from even weak sources

CMoy headphone amplifier circuit diagram:
CMoy Headphone Amplifier Circuit diagram


The op-amp used for this circuit is OPA2132PA, you may use OPA2132P or OPA2134PA as the alternative op-amp chip.



Power supply circuit for CMoy headphone amplifier:
power supply for CMoy Headphone Amplifier Circuit


Go to this page for the complete tutorial of CMoy headphone amplifier circuit.
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Wednesday, September 14, 2011

FM Transmitter circuit using 2N2222

FM transmitter circuit using 2N2222
The FM transmitter circuit is using NPN transistor 2N2222. The L1 and C1 producess necessary oscillations Q1.The collector capacity C4, R3 and R4 resistor performs the function of the output mix theaudio to stereo player or i-emitter resistor R2 Pod.The provides sufficient stability for circuit.It also limits the collector current increse the battery.

With this circuit compact FM adapter connected to the audio output of your cassette player or i pod words, you can listen to your favorite music on the car track is stereo.This doesnot handy if your car stereo has an auxiliary circuit outlet is not to buy a short-range FM transimitter.
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Sunday, September 11, 2011

RE46C190 Photoelectric Smoke Detector

RE46C190 Photoelectric Smoke Detector
This photoelectric smoke detector can be Created a very simple and low power smoke detector alarm that is based on the RE46C190 smoke detector IC. With a minimum of external components, this circuit alarm smoke detectors are provided all the necessary features for a project type photoelectric smoke detector address.

The design incorporates a selectable gain amplifier photos for use with a pair of infrared emitter detector. A flash power internal oscillator circuit smoke detector every 10 seconds, to keep the standby current to a minimum. If smoke is sensed, the detection rate is higher for verifying an alarm condition.
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AM Portable Receiver Using ZN414

AM Portable Receiver Using ZN414
a AM portable ​​radio receiver using ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout.

Designed around the popular ZN414 IC this receiver covers the range of medium wave band of approximately 550 to 1600 KHz with the values ​​indicated. The condenser coil and tuning can be taken from an old MW radio to save time. The ZN414 IC, has been replaced by the MK484. The integrated circuit is a 3 pin, tuned circuit radio frequency, and incorporates several RF stages, automatic gain control and an AM detector. It's easy to overload and voltage of th IC is critical to success.

In this circuit a small voltage regulator turns on the transistor BC108B, 1N4148 diodes four, 2k7 and 10k resistor and the resistance of pre 820R. The 10k pot control acts as a receptor selectivity for all, control the operating voltage for the ZN414 (or MK484).

The audio amplifier is built on an investment of 741 op-amp amplifier circuit. Additional current pulse is provided by the BC109C / BC179 complementary pair of transistors to drive a 8 ohm speaker. The voltage gain full audio amplifier is around 15. The audio output of the complete receiver is really good and undistorted.
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Thursday, September 8, 2011

4 Channel Audio Mixer using LM381

4 Channel Audio Mixer using LM3814 channel audio mixer using the LM381 IC low noise dual preamplifier. Each of the two amplifiers is completely independent lm381, with each internal power supply decoupler-regulator with 120 dB of rejection of the offer and 60 dB channel separation. Other features include high gain (112 dB), large output voltage swing (VCC b 2V) pp and wide power band width (75 kHz, 20 Vp-p).

High gain operational amplifier combines four individual input signals. The DC power supply should be well filtered, and the circuit must be protected to avoid picking up hum. If you need more audio inputs that can add more inputs by connecting another capacitor 1uF in series with a 500k pot to the network.

To supply the project audio mixer electronic circuit can use a DC power supply (or battery) that will provide an output voltage between 9 and 24 volts.
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120W Stereo Amplifier using STK4241V

120W Stereo Amplifier using STK4241V
Here is a circuit 120 watt stereo amplifier using STK4241V. The MAX9710 a stereo audio power amplifier capable of delivering 2 x 120 W of the IC to put loads of 8 ohms. MAX9710 can be operated from ± 32V single power supply of ± 54V.

This amplifier circuit is ideal for audio devices for home supply. STK4241V amplifier specifications might lead one to believe that you can use supply voltages of ± 78V. With zero input signal (and therefore no way out) I could, but I would not recommend anything better than ± 45V 8-ohm loads, if expected, although ± 54V will be fine if you can provide a good heat sink.
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Monday, September 5, 2011

Multi-color LED Driver Schematic

Multi-color LED Driver Schematic

Have you ever wondered how many various colours can illuminate a LED? One, two or possibly three? Making this simple circuit, you will discover it a lot more. The important component in this design is a dual LED. One such accessory includes two inside the 'slices' of different diode LED, that each and every of them produces a different color (commonly green and red). For the drive needs three pins, a common cathode and two separate roots. In this way every single of the two integrated diodes can light up as independent of one another. You'll find only two colors that may create this dual LED.



Setting appropriate percentage of the currents flowing via two separate channels of the POY is, we have other from pure green and red, orange (IR = 21G) and yellow (IG = 2IR). In this circuit, the anodes of the double LED driven by the outputs a six-point buffer tri-state technology CMOS. As opposed to most integrated family of CMOS 4000, the 4503 applied here, can supply many different loads on high currents of the order of 10 mA. The stream that goes towards the two diodes is limited by the resistors R1 to R6 whose specific values are those that attain the distinct colors and changing brightness them. The circuit was originally created to display three various situations, each expressed their the presence of logical '1 'in one of the inputs a, b, c. The entries are able to activate only one of every single time, and if none of them had been excited, a NAND gate (IC1c) ensured that the LED 'to create fourth color. In the improved version we present these days, the circuit has added another level oscillator (IC 1 a and IC1b), which produces about two pulses per second. The pulses are introduced in the entrance activation OA (pin 1) of 4503, resulting in colorful flashes. The oscillator is controlled by the of logical statements applied to the inputs 'd' and 'e'. If both are simultaneously logical '1 ', then each the oscillator and also the buffers of 4503 stay inoperative. If e = 1 and d = 1, then all buffers are driven in a state of high resistance plus the circuit absorbs the least feasible electric current (standby). The power supply circuit was initially set at 12 Volt, but all of the components that are able to work equally properly with any voltage in between 5 Volt and 16 Volt.
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Thursday, September 1, 2011

UPC1651 FM Transmitter

UPC1651 FM Transmitter

Here is the circuit of an FM transmitter with the IC UPC1651. UPC1651 is a broad band amplifier MMIC UHF silicon. The IC has a wide frequency response and power to win up to 1200MHz 19dB.The IC can be operated at 5V DC.



The audio signals picked up by the microphone is fed to the input terminal (pin 2) of the IC through the capacitor C1. C1 acts as a noise filter. The FM modulated signal will be available at the output pin (pin 4) of the IC. L1 inductor and capacitor C3 LC circuit forms necessary for the creation of the oscillations. Transmitter frequency can be varied by adjusting the capacitor C3.



Notes.

The circuit can be assembled on a Vero board.

Inductor L1 can be made by making 5 turns of 26SWG enameled copper wire on a 4mm diameter plastic former.

A ¾ meter insulated copper wire can be used as the antenna.

Do not give more than 6V to the IC.

Mic M1 can be a condenser microphone.

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15W Stereo audio Amplifier using TDA 4935

15W Stereo audio Amplifier using TDA 4935

TDA4935 2x15W audio amplifier is high quality Siemens IC. The IC can be used in stereo or bridge mode. In stereo mode can deliver 15W Stereo audio Amplifier using TDA 4935 per channel in bridge mode can deliver 30W to an 8 ohm load at the source of 30V. TDA4935 requires very few external components and has an ample supply voltage range. The IC operates in class B and has built-in protection circuits over temperature and overload protection.



Notes :

  • The circuit must be assembled on a good quality PCB.
  • TDA 4935 must be fitted with a proper heat sink.
  • The supply voltage can be anything between 8 to 30V DC.
  • Capacitors C1, C2, C8 are polyester capacitors.
  • Capacitors C3, C4 and C6 are ceramic capacitors while C5 and C9 are electrolytic.
Via : circuitstoday.com

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