Back to basics…the 74HC04
I love blinky things and I love to think about how to design something a little differently. Probably the most common way to control red-green-blue LEDs is with a pulse width modulation signal from a microcontroller. Many coding interfaces have built in PWM functions so that you can be up and running within a few […]
Voltage and Current RMS rambling
An easy way to calculate the power needed to drive the speaker uses Paverage = VRMS * IRMS, or Paverage = Power (Watts) = Voltage squared/ Resistance (Ohms). This uses only the resistive part of the impedance. Watts RMS actually doesn’t exist. The voltage in the formula refers to RMS Voltage (explained below), but the […]
Loudspeaker ramblings
I’ve never really thought too much about getting sound out into the world. Everything just…works. I have an old Samsung mp3 player, it plays music through speakers into my ear. I can adjust the volume easily. Same for my beloved Droid phone. It outputs both music and voices. Last summer I built something that ran […]