Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Cursitor Doom Newsgroups: sci.electronics.design Subject: Re: Favourite Test Equipment Date: Fri, 05 Apr 2024 17:35:51 +0100 Organization: A noiseless patient Spider Lines: 17 Message-ID: References: <9k7j0jlnbhs8qfg5m17pium0835meean83@4ax.com> <1qrjb8o.u2ipkmlx8gzsN%liz@poppyrecords.invalid.invalid> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Date: Fri, 05 Apr 2024 16:35:52 +0200 (CEST) Injection-Info: dont-email.me; posting-host="4ecad30f3fe58b8bab64825548a78d20"; logging-data="1569722"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19EvRtP76+dxQ9mvPMkXSrqAlre9qrSoUc=" User-Agent: ForteAgent/8.00.32.1272 Cancel-Lock: sha1:az6Hi/gdc23SvXvReJzn7f3IYkQ= Bytes: 1828 On Fri, 5 Apr 2024 09:24:53 +0100, liz@poppyrecords.invalid.invalid (Liz Tuddenham) wrote: >Jan Panteltje 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.