[sudo-discuss] Help design a circuit for sudoroom's hardware hacking tuesdays!

[Jake]

I have always loved the idea behind Circuit Hacking Mondays, which happens 
at Noisebridge every Monday for the past n years.

Sudoroom will be having Hardware Hacking Tuesdays from now until t, and we 
need to come up with some stock kits for n00bs to put together to learn 
how to electronics!

seeing as we just got a huge donation of stuff (listed below) I say we 
come up with something that uses these excellent, FREE recycled components 
that would otherwise end up in a landfill or our lungs.  It helps greatly 
that the components just happen to be perfect for...

DIY micro-music synthesizers!!!

picture this:  a kit you can put together at sudoroom which, when you're 
done, makes awesome musical sounds and maybe sequences with a bunch of 
dials to turn and buttons to push.

your mission:  design a cool kit using the parts we have plenty of!  the 
winning designs will be made into actual circuitboards sent out for 
fabrication and zillions of people will build those kits!

we have unlimited potentiometers (board-mounted with a long enough shaft 
to turn with fingers)
unlimited board-mounted buttons (four-pin, either SPST or DPST)
unlimited piano-style DIP switches (two and eight positions)
unlimited op-amps (250MHz bandwidth OPA354 i believe)
unlimited 74HC14 schmitt triggers (six oscillators of any frequency)
RCA jacks, headphone jacks, LM1877 audio amplifier chips
and all the resistors and capacitors you could possibly need

your design should not include a microcontroller, just passive parts that 
go together and make noise.  Input will be 5 volts DC, output will be 
line-level audio for going into amplified speakers.

we have lots of logic chips like 74HC163 four-bit counters and 74AC351 
8-input multiplexers - so it should be easy to add a sequencer to your 
design!

if you have plug-in breadboards, bring them in, it will make it easier to 
prototype this stuff.

see you on tuesdays!

-jake

On Sat, 31 Jan 2015, Patrik D'haeseleer wrote:

> Sounds like we should come up with a little electronics kit that uses as 
> many of these as possible, and then sell or give them away as soldering 
> 101 kits.
> 
> Patrik
> 
> On Jan 31, 2015 1:39 PM, "Jake" <jake at spaz.org> wrote:
>       yesterday I brought a pickup truck load of electronics to sudoroom:
>
>       20000 20000 ohm pots
>       20000 board-mount buttons
>       thousands of op-amp chips
>       boxes of RCA jax and headphone jax
>       hundreds of 87c52 microcontrollers...!
>       spools of surfacemount capacitors and resistors (mostly 0805 size)
>       1,000 74HC14N (for hex oscillators!!) and lots of other interesting chips
>       thousands of 25V lectrolytix 220 470 1000uF
>       a thousand NDT3055L general purpose NPN transistors
>       a thousand LM1877 audio amplifier chips
>       hundreds of LM1881 video sync seperators (for overlaying text on video!)
>       rails and rails of DIP switches (piano style, 2 pos and 8 pos)
>       many assembled circuitboards with cool stuff on them, including FPGAs!
>       boxes and boxes of 4x6" backlit monochrome LCD displays...
>
>       what should we build with all this stuff?
>
>       now i gotta design a board that uses those things to make music for a hardhack tuesdays kits...
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> 
>