Paul Stoffregen writes:
Yesterday I made a little audio clip player for a Monty Python Flying Circus theme party. It plays the 3 second dramatic sound for the unexpected Spanish Inquisition entrance.
The hardware is pretty simple. It’s just a Teensy 3.0 that “plays” the audio using a PWM pin.
The PWM is amplified to a 9V signal using a NPN transistor, then a pair of transistors buffer the signal to the current required to drive an 8 ohm speaker.
I had intended to make a nice L-C filter to remove the PWM carrier, but only the 100 uH inductor made it onto the breadboard as I quickly put this thing together in only a couple hours.
Read more here for source code and more!
Featured Adafruit Products
Teensy 3.0 + header – Teensy 3.0 is a small, breadboard-friendly development board designed by Paul Stoffregen and PJRC. Teensy 3.0 will bring a low-cost 32 bit ARM Cortex-M4 platform to hobbyists, students and engineers, using an adapted version of the Arduino IDE (Teensyduino) or programming directly in C language. (read more)
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Transforming Today’s Bad Jobs into Tomorrow’s Good Jobs
Wearables — Etching a stencil
Electronics — Is your op amp going crazy?
Biohacking — Token – A Wearable Ring with NFC & Bluetooth
No comments yet.
Sorry, the comment form is closed at this time.