On 12-14-94 firstname.lastname@example.org wrote to email@example.com:
> Hooray! Got R2 working on 40 m. What a kick to have DC audio and
> single-signal reception! Can't stop tuning around to hear the rich
> variation in CW notes and SSB audio quality.
Absolutely stunning, indeed.
> Question: Who supplies mica insulators (and heat resistant, non-
> conducting hardware) for heat sinks? I'd really like to heat sink the
> R2 audio transistors to the chassis, but one of them needs to to be
> insulated from ground, and Campbell suggests using mica. Also, mica
> insulators are recommended for heat sinking the RF power transistors
> in the Hands Electronics linear I'm going to build for T2. Is there
> some readily available substitute?
I'm sure even Rat Shack sells various semiconductor mounting kits, including
the wafer, screws, and insulated washer for various transistor configurations.
My local electronics house carries them; almost all the major outfits.
Mica has been the standard; but there are also some silicone wafers that don't
need heat conductive grease. Check your catalogs.
: John Seboldt firstname.lastname@example.org / I am Bach of Borg...
: Amateur radio K0JD... / your style will be
: Church of the Annunciation, / assimilated.
: Minneapolis /
-> Alice4Mac 2.3 E QWK Eval:05Mar94
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