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Re: Decades-Old DIY Sampler Mystery Solved

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On 2025-11-12 03:51, rbowman wrote:
> On 11 Nov 2025 22:08:41 +0000 (GMT), Theo wrote:
> 
>> (there were lots of projects like 'DIY electronic ignition for your car'
>> and I do wonder how many people actually built them in order to mod
>> their cars)
> 
> I did :)  The project specified a particular ferrite core that was
> unobtanium. A friend knew a guy who knew a guy...  At the time IBM spun
> off a lot of little cottage industries to handle stuff that they didn't
> want in house, in some cases because of paranoia about being a monopoly.
> Anyway the guy in question was operating his little ferrite business out
> of his garage. I drove down to his place in the outskirts of Kingston. As
> i recall he gave me the cores as a sample to avoid paperwork. And I was on
> my way to a CDI!
> 
> I've looked at enough of those projects that when I see some strange
> component or parts with values that aren't common I realize those were
> whatever the author had laying on his workbench at the time rather than
> the result of careful design.
> 
> I still have a collection of ferrite toroids, air variable caps, and so
> forth from when I was messing around with radios. You can bet if I design
> something it will be using them. Good luck finding the exact part in 2025.

Many coils and variable capacitors at the time were unobtanium :-(

Several projects I actually built did not have the exact pieces. Some 
worked some not. Like one amplifier that required a couple of matched 
push pull transistors. Each transistor I got was a different type of 
equivalent in different packaging. One plastic, the other metallic.

-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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Decades-Old DIY Sampler Mystery Solved Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-11-10 00:58 +0000
  Re: Decades-Old DIY Sampler Mystery Solved Theo <theom+news@chiark.greenend.org.uk> - 2025-11-11 16:59 +0000
    Re: Decades-Old DIY Sampler Mystery Solved rbowman <bowman@montana.com> - 2025-11-11 18:24 +0000
      Re: Decades-Old DIY Sampler Mystery Solved Theo <theom+news@chiark.greenend.org.uk> - 2025-11-11 22:08 +0000
        Re: Decades-Old DIY Sampler Mystery Solved rbowman <bowman@montana.com> - 2025-11-12 02:51 +0000
          Re: Decades-Old DIY Sampler Mystery Solved "Carlos E.R." <robin_listas@es.invalid> - 2025-11-12 10:52 +0100
            Re: Decades-Old DIY Sampler Mystery Solved Theo <theom+news@chiark.greenend.org.uk> - 2025-11-12 13:14 +0000
              Re: Decades-Old DIY Sampler Mystery Solved "Carlos E.R." <robin_listas@es.invalid> - 2025-11-13 18:47 +0100
        Re: Decades-Old DIY Sampler Mystery Solved "Carlos E.R." <robin_listas@es.invalid> - 2025-11-12 10:45 +0100
          Re: Decades-Old DIY Sampler Mystery Solved rbowman <bowman@montana.com> - 2025-11-12 18:47 +0000
  Re: Decades-Old DIY Sampler Mystery Solved "Carlos E.R." <robin_listas@es.invalid> - 2025-11-12 10:46 +0100
    Re: Decades-Old DIY Sampler Mystery Solved rbowman <bowman@montana.com> - 2025-11-12 18:40 +0000
      Re: Decades-Old DIY Sampler Mystery Solved John Ames <commodorejohn@gmail.com> - 2025-11-12 11:00 -0800
        Re: Decades-Old DIY Sampler Mystery Solved scott@alfter.diespammersdie.us (Scott Alfter) - 2025-11-12 23:22 +0000
          Re: Decades-Old DIY Sampler Mystery Solved "Carlos E.R." <robin_listas@es.invalid> - 2025-11-13 19:03 +0100
      Re: Decades-Old DIY Sampler Mystery Solved "Carlos E.R." <robin_listas@es.invalid> - 2025-11-13 18:52 +0100
  Re: Decades-Old DIY Sampler Mystery Solved songbird <songbird@anthive.com> - 2025-11-14 23:43 -0500
    Re: Decades-Old DIY Sampler Mystery Solved "Carlos E.R." <robin_listas@es.invalid> - 2025-11-15 14:54 +0100

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