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From: Cursitor Doom <cd@notformail.com>
Newsgroups: sci.electronics.design
Subject: Re: Favourite Test Equipment
Date: Fri, 05 Apr 2024 17:35:51 +0100
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On Fri, 5 Apr 2024 09:24:53 +0100, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

>Jan Panteltje <alien@comet.invalid> wrote:
>
>> Giggle Hertz oscillations are not happening in LC circuits of specific
>> kind where those can happen you can figure from the parts used, no giggle
>> Hz in a BC109.
>
>Back in the 1970s I found that a BC109 could be used as a self-
>oscillating transmitter output stage at 100 Mc/s on a 1.5v supply (it
>was for small animal cardiography).  Most "R.F." transistors wouldn't
>work under those circumstances.

We used to make bugging devices using '109s with button cap
microphones that worked on that VHF broadcast band. They were highly
effective as I recall.