[sdiy] 566

[Scott Gravenhorst]

"Steve Ridley" <spr at spridley.freeserve.co.uk> wrote:
>
>'evening all...
>
>Maybe I'm being a bit dim tonight, but I just can't see why 
>anyone gets excited about these ICs.   They're scarce, can 
>be expensive and need some clever cludging make a VCO 
>which still goes flat above 9KHz.  With people making so 
>much effort to get them and build VCOs out of them, I feel 
>I must be missing something, but I can't see what?
>
>I restored a couple of Ken Gale "Wavemaker" VCO modules
>a while back.  They were based around the 8038 and an
>exponential converter and worked remarkably well.  Again,
>a lot of work to make the IC behave as a VCO, but you get 
>a good sine wave for your effort, it stays in tune and the
>ICs were still fairly common last time I looked.

Here's the Thomas Henry version:

http://www.midwest-analog.com/diylvco.html

Actually doesn't look that bad and at least it's more than
just square/tri.  And as you say, they are still available
and cheap as dirt.  I do intend to try this, esp. because I
live in linear land.

=========================================================  
- Where merit is not rewarded, excellence fades.
- Hydrogen is pointless without solar.
- What good are laws that only lawyers understand?
- The media's credibility should always be questioned.
- Governments do nothing well, save collect taxes.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.gte.net/res0658s/FatMan/
-- NonFatMan: home1.gte.net/res0658s/electronics/
-- Master of Arcane and Hidden Knowledge.