Re: Favourite Test Equipment

On a sunny day (Fri, 5 Apr 2024 09:24:53 +0100) it happened
liz@poppyrecords.invalid.invalid (Liz Tuddenham) wrote in
<1qrjb8o.u2ipkmlx8gzsN%liz@poppyrecords.invalid.invalid>:

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.

That is MHz, not giggle Hertz
Early sixties I uses a transistor in my small FM transmitter.
It was powered by a battery via a dynamic microphone.
The few mV power supply variations that mike caused when any sound present were enough to make Cce Ccb variations
to cause the frequency to change so much that you could hear a clock ticking in the room listening
to that transmitter on the radio.
I still use transistors as varicap if I need one.