Mica Insulators

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From: rohrwerk@holonet.net
Date: Fri Dec 16 1994 - 23:59:32 EST


On 12-14-94 rirons@eis.calstate.edu wrote to qrp-l@netcom.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 rohrwerk@holonet.net / 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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