"transistorphonics"

[Paul K. Dean]

Wasn't this essentially what was going on in the HW-7s?  I remember mine
years ago, tap it slightly and your headphones would ring!  Fortunately,
that problem was corrected in the HW-8.

73,
Paul, wb9hgz

At 05:37 PM 3/9/1999 -0700, Chris Trask wrote:
>On Tue, 9 Mar 1999, Peter L Thompson wrote:
>
>> Hi, Heath fans
>> How can you have microphonics in a solid state scanner?
>> Anyone have a suggestion for that one? I'll listen............
>>
>        Microphonics in either crystal or LC oscillators is a very common
>problem.  I once spent two months with a 4-channel crystal oscillator
>AND a CO2 temperature chambre mounted ON a hydraulic vibrator trying to
>track down the cause of vibration sensitivity (microphonics) at -10C.
>Turned out that the entire assembly needed to be shock-mounted.
>
>
>     ,----------------------.       Circuit Design for the
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