[Noisebridge-discuss] First Atari Punk Console : Couple of questions

[matt holland]

comments inline

On Fri, Jul 30, 2010 at 4:36 PM, Mike Chambers <mikechambers at gmail.com> wrote:
> I am building an Atari Punk Console on a breadboard from this
> schematic (hooking up the speaker and not the line out):
>
> http://www.beavisaudio.com/library/555/556_Stepped_Tone_Generator_Schematic.jpg
>
> I have a couple of questions I was hoping someone on the list might be
> able to help me with.
>
> 1. How do I hook up to potentiometers? Do I hook up all three
> contacts? From the schematic, it looks like only two are hooked up.
> Does one go to ground?

Pots are potentiometers if they vary the middle terminals potential
between two other potentials on the outer terminals, say 9v and gnd
for example, if you understand voltage dividers you will see what's
going on there. If only two terminals are hooked up it's been used as
a variable resistor. The outer terminal you choose determines whether
resistance increases CW or CCW.

>
> 2. I actually have it working through a speaker, but the volume is
> very low. I am using an 8 Ohm speaker:
>
> http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?jameco_page=42&langId=-1&productId=673766&catalogId=10001&freeText=673766&storeId=10001&search_type=jamecoall&ddkey=http:StoreCatalogDrillDownView
>
> Anyone have any idea why the volume might be so low?

I'm guessing you're not delivering enough power (current)? Maybe look
up some simple opamp based audio amplifier circuits?

> Thanks for any suggestions...
>
> mike
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