Comparing the NE555 Timer and LM386 Amplifier as Inductorless DC-DC Converters

The bipolar NE555 timer IC is widely used in inductorless dc-dc converters, most frequently in doubling and inverting converters. However, another very popular IC, the LM386 audio amplifier, may be a better solution in this application. Note that the results also depend on the specific manufacturer of these multisourced ICs and on the quality of the related components. (We will use only Schottky diodes, to ...

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5.5W – 2 Channel Audio Amplifier

Description The small 2 Channel amplifier constructed around Sanyo’s LA4445 IC delivers 5.5Watts +5.5 Watts at 4 ohm load, supply in 12V DC 2Amp, Input impedance 30K. Specifications Dual Channels output : 5.5W Minimum External Parts Very small pop noise at the time of power supply ON/OFF Good ripple rejections Small residual noise Built-in protectors 1. Thermal Protector 2. Overvoltage Surge Protector Stand ...

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Mini Audio Amplifier

Description The Mini Audio Amplifier project is a good choice for battery operated gadgets.  It is based on Texas instruments LM386 IC, provides high quality Audio. Specifications Wide power supply input 6 to 12 VDC 500 mW output @ 8 Ohms load Takes standard audio signal as input Low quiescent current drain 4 mA IC The quiescent power drain is only 24 mW when operating from 6 VDC Onboard preset for volume a ...

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20W Bridge Audio Amplifier

20W Bridge Audio Amplifier project, based on the TDA2005 IC, The TDA 2005 IC is class B dual audio amplifier, specifically designed for car radio applications etc. Specifications: Power supply input : 18 VDC Output power : 20 W, 4 Ω IC built in Thermal Shut-down, Load dump voltage surge protected Terminal pins for connecting left and right audio signal inputs Berg Connector for connecting Potentiometer (POT ...

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14W Stereo Audio Amplifier

Description 14W Stereo audio power amplifier build around LM4730 IC. The LM4730 is stereo audio amplifier capable of delivering typical 14W per channel of continues average output power a 4 Ohms or 8 Ohms load with less than 10% THD+N from  20Hz to 20Khz frequency. Each amplifier has an independent smooth transition fade-in/out mute and a power conserving standby mode which can be controlled by onboard slid ...

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50W Power Amplifier with LM3886

Description This is my second encounter with LM3886. I was pleased of the sound this chip produced the first time, so I decided to make another amplifier with it. The schematic is based on the schematic in the datasheet of the chip with minor changes. I removed the time delay capacitor connected to MUTE pin, because it’s better to use separate DC protection schematic which has similar functionality. I made ...

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Audio Power Amplifier with TDA2050

This project is an audio amplifier based on TDA2050 and LM1875. This is not an ordinary project, but an attempt to make a PCB that is suitable for TDA2050 and LM1875 and has all the necessary circuitry on board – power supply, speaker protection, delayed turn-on and fast turn-off. This is achieved using the convenient uPC1237 IC. TDA2050 and LM1875 are pin to pin compatible, the differences in their schemat ...

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ADI shrinks package size of 16-bit DACs

The AD5689R nanoDAC+™ is a dual, 16-bit, rail-to-rail, voltage output DACs. The device includes a 2.5 V, 2 ppm/°C internal reference (enabled by default) and a gain select pin giving a full-scale output of 2.5 V (gain = 1) or 5 V (gain = 2). The device operates from a single 2.7 V to 5.5 V supply, is guaranteed monotonic by design, and exhibits less than 0.1% FSR gain error and 1.5 mV offset error performan ...

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Two AA cell instrumentation amplifier for body networks

The AD8237 is a micropower, zero drift, rail-to-rail input and output instrumentation amplifier. The relative match of two resistors sets any gain from 1 to 1000. The AD8237 has excellent gain accuracy performance that can be preserved at any gain with two ratio-matched resistors. The AD8237 employs the indirect current feedback architecture to achieve a true rail-to-rail capability. Unlike conventional in- ...

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5W Stereo Audio Amplifier

Description 5W Stereo Audio Amplifier project based on BA5406 IC which is  suitable for application like stereo radio cassette player, stereo components systems etc. The Heart of the project, BA5406 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=12 V and RL=3Ω, and 2.8 W×2 when VCC=9V and RL=3Ω. The BA5406, which uses ...

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Melexis motor driver has on chip EEPROM

MLX83203 General Description The MLX83203 pre-driver is designed to drive high-current N-type FET 3-phase motor control applications. A combination of bootstrap and charge pump enables driving 6 NFETs, with gate charges up to 400nC/NFET with a minimum of device self-heating. The IC reset level below 4.5V allows for low-voltage operation. Each of the 6 external FETs can be controlled directly via the 6 digit ...

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TI has low noise chip for monitoring brain waves

Description   The ADS1299 is a low-noise, multichannel, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADS1299 incorporates all commonly-required features for electroencephalogram (EEG) applications. With its high levels of integration and exceptional performance, the ...

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