This was made by me when i was a kid, it was even published in a magazine, i think it will work, it was used on a very old huge ornamental valve philips stereo system in the remote speakers.
Recently i captured this circuit in eagle to publish online, it seems to have a small design error. It worked well for many years. The step-down transformer is used as a step-up here. The secondary winding was around 50mA so the resistance was protecting the 2N2222. (SL100 was used in the original one). C1 and R3 may need tweaking to get the desired adjustment range in R2.
The voltage across the speaker is fed to C1-Gnd, which blocks DC component. R1, R2, R3 form a threshold bias for T1. 2N2222 chops the 12V DC in tune with the music. The chopped DC current flowing in the 12V winding of TR1 is stepped up into AC pulses over 100V, this lights the Neon in flashes synchronizing in real-time with the beats. Known Issues – It does not perform well at low Bass like 20Hz.
The Source file in CadSoft EAGLE format is here del00005.zip
Wouter van Ooijen runs VOTI is an engineer who has worked on many software and systems projects. He has a Webshop with PIC Parts and Kits. His PIC FAQ and “blink a LED using one of these flash PICmicro controller” is great for beginners.
Van Ooijen Technische Informatica
A very slow 0.. 5 Volt fader
A circuit that generates a voltage that rises slowly from 0 to 10 Volt and (when a switch is flipped) slowly back to 0. The request did not pose much restriction on the wave form, but a rise / fall time of 30 minutes should be possible.
I got a mail question, which i logged here Long Duration Linear Sweep or Ramp Generator. The above project could be an neat answer.
A Geek How-To , Gadget and Arduino Community News site run by Oscar Gonzalez form A Coruña in Spain. From software programming, electronic projects and DIY Gadget Gizmo hacks.
BricoGeek.com – Gadgets Gizmos and Arduino
Arduino Nano is like the Arduino Mini, but smaller. Allows rapid prototyping on a breadboard.
Comes with chip version 3.0 ATMega328. ICSP connector for external programmer. USB mini-B connector for programming and serial communication. Integrated voltage regulator. Pins-spaced 0.1 “DIP for insertion directly on a breadboard
RoboBrrd is an animatronic character designed to be utilized as a tangible physical interface to interact with learning applications for elementary school students. A Smart Robot Bird. A Edutainment aid Bot Avian.
RoboBrrd from RobotGrrl
Impy RoboBrrd – Nicknamed ‘Impy’, short for ‘Important’. This is the latest RoboBrrd, and the official prototype that sparked the creation of an Instructable and intense documentation for the RoboBrrd robots! Impy uses a standard Arduino as a brain and has a NFC reader to see what hats it is wearing.
With RoboBrrd being a tangible physical interface, the students will interact with RoboBrrd to control the in-game character within the learning application, and RoboBrrd will motivate the students to keep playing with chirps and celebratory dances. Different behaviours in RoboBrrd will be unlocked for every level that is beat,