[sdiy] Synthesizers...

[Roy J. Tellason]

On Wednesday 18 February 2009 12:05:58 am Oren Leavitt wrote:
> Did somebody say "Synthesizers"?!?
>
> Hi Tom and all,
> A busy past few work weeks have kept me busy.
> But when I can get some SynthDIY in edgewise...I have been working on
> some "odds and ends" type analog modules.
>
> 1) A "0 - 10VDC" volt meter module that uses a nice little 0-10V Simpson
> analog meter movement that I happen to have sitting around. A couple of
> banana jacks for the +/- inputs and a polarity reverse switch.

I have a few odd meters laying around that I've been meaning to do something 
with.  Got one sitting here already in a nice metal box that's 0-20uA,  too,  
I snagged it off ebay a while back as an impulse purchase,  fairly cheap.

> 2) Adapter interface panel with several rows of connected 1/4" phone
> jack <-> 1/8" mini phone jack <-> banana/binding posts.

I've had idle thoughts for a while now about building something of the sort,  
more likely a box than a panel,  and with a whole lot more variety of 
connectors than that.  Add in XLR and RCA for starters.  :-)

> 3) Output interface panel with 3 input mixer, bass/mid/treble EQ, master
> level control, buffered output that can drive a 600 ohm line, and power
> on/off transient supression.

Got schematic?  That sounds useful, particularly that last bit about the 
transient supression.

> 4) A "standards" panel with a precision 1.0000 and 10.000 volt
> references, 440Hz and 1000Hz sine wave tone sources.

What are you using for those?  I started a 440Hz sinewave oscillator (used a 
phase-shift circuit and figured I'd trim it if I needed to) but never 
packaged it up and tested it,  though it's mostly built.


-- 
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space,  a critter that can
be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James 
M Dakin