Category Archives: Analog

A DIY mono class D amplifier

The PAM8610 is a 10W stereo Class-D audio amplifier chip available in a 40pin QFN 6mm*6mm package. The PAM8610 runs off a 7V to 15V supply at much higher efficiency than competitors’ ICs and requires a very few external components for operation. You can buy a PAM8610 amplifier breakout board for less than $2 on eBay and Aliexpress. This Instructables described how to use one of those amplifier modules along with a pack of rechargeable lithium battery to drive a 4″ speaker delivering ~15W of output power. The instructable describes also describes how to connect a charging circuitry for the lithium

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Audio transmission using Laser

Armand & Victor did an interesting experiment about sending audio over a laser beam. They used a 250mW diode laser, modulated its output with an audio signal, and aimed the modulated beam to a solar cell located at more than 400 meters away. The output of the solar cell is directly fed to an high power amplifier to reconstruct the audio. You wouldn’t believe the demodulated audio was surprisingly good quality.

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MAX038 function generator

Milen posted this Instructable on the design of a MAX038 function generator that also implements an Atmega328 and an LCD to display the parameters. The function generator is very useful tool for the electronics freaks. It is needed for tuning resonance circuits, testing audio and video equipment, designing of analog filters and for many other different purposes. Today there are two main types of function generators ; digital, (DSP based, DDS…) which are more and more often used and analog, which were the origins. Both types have their advantages and disadvantages. The digital generators can generate signals with very stable

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Making a simple follow-me robot

Saurav Chakraborty has shared his making of a very basic DIY follow-me robot that uses no microcontroller. It uses two sets of IR photodiodes and an IR LED to sense the presence of an object in fron of it. When the object is sensed, two DC motors are turned on using transistor switches and the robot moves forward. The robot can also follow left and right path based on the motion of the front object.

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Building a function generator

In his 2-part Youtube videos (Part 1 and Part 2), Scullcom describes in detail how to build a basic function generator with frequency up to 30KHz using XR2206 chip. He uses an Arduino Nano for controlling and display purpose. The output frequency is displayed on seven segment LEDs. via [Hackaday]

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