Thursday, April 16, 2015

Audio oscillator with frequency counter 2

My last project is not completely new. In fact, the oscillator is made from the same schematic as in one of my previous projects and only the frequency counter is made with different schematic.

Wednesday, August 20, 2014

Frequency counter with PIC16F628A

Some time ago I made an audio oscillator with frequency counter which worked very well, but I sold it, and now I am making a new one. The oscillator itself will be mostly the same and when I finish the whole project there will be a separate article. Here I will show the frequency counter module I made for the project.

Wednesday, June 11, 2014

LED VU Meter with LM3916

This was finished months ago and just now I had time to finish the article. LM3916 is a dedicated IC for VU LED meter.  Unlike LM3915 which have 3dB step between voltage levels, the LM3916 have nonlinear steps: -20, -10, -7, -5, -3, -1, 0, +1, +2, +3db, just like old school analog VU meters. I saw in YouTube an interesting commercial LED VU meter, which imitates the needle movement in analog VU meters and I thought I can make a similar one. All I needed I found in the datasheet of LM3916.

Saturday, April 12, 2014

Simple timer with PIC16F628A

This is a quick project for a timer. Recently I finished my UV light exposure box and thought that it will be convenient to have a build in timer to switch off the light after preset time.
So I had a PIC16F628A lying around and after searching the web I found a Brazilian site (I think?) with tons of interesting projects with microcontrolers. This project is based on one of them.

Wednesday, March 5, 2014

50W Power Amplifier with LM3886

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.

Saturday, October 19, 2013

Troubles with charger

A couple of months ago I bought a Chinese Android tablet Cube U35GT2 , which is quite nice although it has its downsides. One of them is the charger included in the bundle. It is a typical Chinese charger rated 5V/2A and it gets very hot when I use the tablet while charging. Eventually it burned out and I got to repair it - the output filter capacitor was blown up and I replaced it and also replaced the catch diode with a higher rated one.