Category Archives: Eletronics

Previously I tested a El84 using series of 9 volt batteries to generate the high B+ voltages. While it was very simple by nature, it still fell short of the desired voltages that are required to make a useful audio amplifier. Normally … Continue reading →

Before the 555 contest was announced I was reading the free online book 50 555 Circuits from talking electronics. I was very amazed with how much could be done with the 555 timer. So I decided the best way to understand the 555 would … Continue reading →

I  have always been interested in vacuum tube amplifiers, however the high voltages from the mains has always kept me from experimenting with them. About a year ago I played with an low power tube the 1t4 in a regenerative receiver.  The B+ was set to 45V powered … Continue reading →

This started when I ordered an IR led and phototransistor pair from Spark Fun along with some spare ATMega168 microcontrollers. I first experimented using the IR led to transmit 2400 baud serial to the phototransistor. I programmed my Arduino Diecimila … Continue reading →

This project started one night while I was lying in bed trying to visualize how an AC motor worked. I knew that it was different from a DC motor as in it did not require brushes and the speed was … Continue reading →