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This 10 LED VU meter circuit has only a few parts but is useful as an indicator for the measurement of entering acoustic signals. The circuit is a perfect one chip replacement for the standard analog meters. It is completely solid state and will never wear out LM3914 VU Meter Circuit The circuit is built around an LM3914 IC. The input signal from the VU meter is put on pin 5 of IC1. Through pin 9 of IC1 is the display mode sets (bar or dot instructions). In the drawn state IC1 works in the... Read Full Story

BA5417 is a dual OTL monolithic power IC with two built-in, high output speaker amplifier circuits. High output of 5W×2 can be produced when VCC=12V and RL=3Ω, and 2.8W×2 when VCC=9V and RL=3Ω. BA5417 not only exceeds basic characteristics, but also has a built-in soft clip circuit, thermal shutdown and standby circuits.Stereo Power Amplifier using IC BA5417 Circuit The BA5417 stereo power Read Full Story

Microcontroller T89s51, AT89S52 and AVR is an idol among students. Well now because of technology trends and laptop PCs already left the LPT and COM so more and more difficult to download the firmware into the microcontroller, via LPT or COM. Solutions to be overcome with AT89S S-series, because the facility program downloads with the ISP (MISO, MOSI, SCK, RST), then use the ISP downloader which is also commonly used for this AVR microcontroller type. Time to play man with AT89s so much... Read Full Story

This circuit uses an incandescent lamp to detect airflow (mendeteksi angin). With the filament exposed to air, a constant current source is used to slightly heat the filament. As it is heated, the resistance increases. As air flows over the filament it cools down, thus lowering it's resistance. A comparator is used to detect this difference and light an LED. With a few changes, the circuit can be connected to a meter or ADC to provide an estimation on the amount of air flow.  Rangkaian... Read Full Story

The stepper controller circuit is very interesting, since most lines the step motor controllers are very expensive. The circuit is made ​​of standard components and can easily be adjusted by a computer. If you cheap surplus transistors and stepper motors, the price of the circuit can be less than $ 15. Stepper Motor Controller Circuit using IC 4027 This stepper controller circuit shown here can used to control the unipolar stepper motor, the which has four coils. The stepper controller... Read Full Story

The following is the audio amplifier circuit which built based single power IC STK1050 from Sanyo. The ciruit capable to deliver up to 50W power audio output. Don forget to mount the heatsink to the power IC STK-1050 STK1050 Audio Amplifier Circuit STK1050 Features: Does not require externally connected emitter resistors. Values of emitter resistors have carefully been reviewed to provide superior characteristics. Better supply voltage utilization permits designing power supply voltage that... Read Full Story

The LM386 is an excellent choice for many designs requiring a small audio power amplifier in a single chip. However, the LM386 requires quite a few external parts including some electrolytic capacitors, which unfortunately add volume and cost to the circuit. The LM4906 is capable of delivering 1 watt of continuous average power to an 8-ohm load with less than 1% distortion (THD+N) from a +5 V power supply. The chip happily works with an external PSRR (Power Supply Rejection Ratio) bypass... Read Full Story

The TDA8551 is a small audio amplifier with an integrated volume control. When operated from +5 V, it delivers a nominal output power of more than one watt into 8 ohms. It can also be used over a supply voltage range of +2.7 to +5.5 V, with correspondingly reduced output power. The output volume can be adjusted from –60 dB to +20 dB in 64 steps, using a set of up and down push-buttons. The shared UP/DOWN input for the up and down switches has three states. If it is ‘floating’, which means that... Read Full Story

This circuit is a 2.5W stereo power amplifier using LM4663. The LM4663 is a fully integrated single supply, high efficiency Class D audio power amplifier solution. The LM4663 utilizes a continuous time delta-sigma modulation technique that lowers output noise and THD when compared to conventional pulse width modulators.  LM4663 Mini Amplifier  Circuit  LM4663 Pinout The LM4663 also features a stereo headphone amplifier that delivers 80mW into a 32Ω headset with less than 0.5% THD. The LM4663... Read Full Story

On this occasion We would like to show you for the real MOSFET 400 watt amplifier. The only real difference is the number of output devices to the device. this amplifier circuit using the IRFP448 MOSFET amplifier design while the 14 O / P devices. Skema Rangkaian IRFP448 MOSFET Amplifier 400W These amplifiers can be used for virtually any application That requires high performance, low use Noise, distortion and excellent sound quality. Bias and the buffer stage As the name Suggests All Q, C... Read Full Story