Comments on: Using Adaptors and IPhone for Audio Breadboard Work

By: dfowler

dfowler — Sun, 25 Jan 2009 05:58:46 +0000

@Steve… The chip works nice, or the version I have does. I ran it at max voltage and driving a speaker with the output level clipping. Trying to blow the thing. It got hot and one side of the output gave up. I let the chip cool and it was working well again.

By: dfowler

dfowler — Sun, 25 Jan 2009 05:57:12 +0000

@Randall… Yes these adapters will be available at Curious Inventor soon.

By: dfowler

dfowler — Sun, 25 Jan 2009 05:55:50 +0000

@Jose… Yes the ISR(TIMER2_OVF_vect) function is the function that is called on each interrupt.

By: José Xavier

José Xavier — Thu, 22 Jan 2009 21:42:15 +0000

Hi, i have a question about a old post.
http://www.uchobby.com/index.php/2007/11/24/arduino-interrupts

In this function i have to write what i have that the ISR do, right?

//Timer2 overflow interrupt vector handler
ISR(TIMER2_OVF_vect) {

//Toggle the IO pin to the other state.
digitalWrite(TOGGLE_IO,!digitalRead(TOGGLE_IO));

//Capture the current timer value. This is how much error we have
//due to interrupt latency and the work in this function
latency=TCNT2;

//Reload the timer and correct for latency. //Reload the timer and correct for latency. //Reload the timer and correct for latency.
TCNT2=latency+timerLoadValue;
}

Thanks

By: Joseph Yumul

Joseph Yumul — Wed, 21 Jan 2009 22:40:48 +0000

nice!

By: Randall Bohn

Randall Bohn — Wed, 21 Jan 2009 18:35:09 +0000

Is the stereo jack adapter going to be available for purchase from Curious Inventor? I’d be willing to buy a few of those.

By: Steve Chamberlin

Steve Chamberlin — Wed, 21 Jan 2009 04:01:03 +0000

What a coincidence! I was just working on the audio amplifier output section of my own project, and ordered a TDA7052 from Mouser just last night, before I saw this posting. I got the TDA7052N variant without the DC volume control, instead of the TDA7052A. I wish I’d read this first! I don’t think it will be a big deal to attenuate the input signal rather than alter the gain, but we’ll see.

By: Berni

Berni — Tue, 20 Jan 2009 19:19:44 +0000

Well most audio amps simply decrese the input signal with a pot.

So you are planning any audio projects using a arduino ? I found generating music on a MCU quite easy..

By: Randall Bohn

Randall Bohn — Tue, 20 Jan 2009 01:36:09 +0000

I spent all morning building a sidetone generator in Eagle. This is a two-transistor audio oscillator that is turned on and off with a telegraph key. About one hour putting the parts into the schematic, followed by four messing around with the board layout. That may sound like a real drag, but I had so much fun moving parts around and then re-running the auto-router I just couldn’t stop. There were probably many points where I would have got a good enough board layout, but I just kept on going. I might have saved myself some time if I was more careful about adding the components to the board the first time around. I’m sure as I keep designing boards I’ll get better at it. I hope to get the board fabbed using BatchPCB.com later this year and eventually use it in my morse code tutor.