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Re: cheap testing

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On 10/21/2025 2:43 PM, john larkin wrote:
> We're testing a proto board. I'm temperature compensating a 50 MHz LC
> oscillator.
> 
> The beer cooler is a great benchtop temperature chamber, for about
> $35. I didn't have a frequency counter here, so I bought that one from
> Amazon for $70.
> 
> The beer thing heats and cools at about 1.5 deg c per minute, so a
> temp sweep leaves time to do other things. Kinda like Spice.
> 
> The setup really needs the fan inside the cooler.
> 
> The window is cool. I can see the LEDs blinking.
> 
> https://www.dropbox.com/scl/fo/k506jnwlvdz0stxmfkyck/AP-coSSFwLNgfZk1_TOZn18?rlkey=h9zitd71looudqxsredr3sg01&dl=0
> 
> 
> 
> John Larkin
> Highland Tech Glen Canyon Design Center
> Lunatic Fringe Electronics

Clever!
Ed

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cheap testing john larkin <jl@glen--canyon.com> - 2025-10-21 11:43 -0700
  Re: cheap testing ehsjr <ehsjr@verizon.net> - 2025-10-21 16:27 -0400
  Re: cheap testing JM <sunaecoNoChoppedPork@gmail.com> - 2025-10-21 23:20 +0100
    Re: cheap testing john larkin <jl@glen--canyon.com> - 2025-10-21 18:52 -0700
      Re: cheap testing Jan Panteltje <alien@comet.invalid> - 2025-10-22 08:52 +0000
        Re: cheap testing john larkin <jl@glen--canyon.com> - 2025-10-22 07:17 -0700
          Re: cheap testing Gerhard Hoffmann <dk4xp@arcor.de> - 2025-10-22 16:57 +0200
            Re: cheap testing Jan Panteltje <alien@comet.invalid> - 2025-10-22 17:21 +0000
              Re: cheap testing john larkin <jl@glen--canyon.com> - 2025-10-22 17:46 -0700
                Re: cheap testing Jan Panteltje <alien@comet.invalid> - 2025-10-23 07:36 +0000
          Re: cheap testing Joe Gwinn <joegwinn@comcast.net> - 2025-10-23 18:41 -0400

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