Sujet : Re: Final final 1kHz oscillator
De : bill.sloman (at) *nospam* ieee.org (Bill Sloman)
Groupes : sci.electronics.designDate : 16. Nov 2024, 16:27:23
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vhadl5$2v27$1@dont-email.me>
References : 1 2 3 4
User-Agent : Mozilla Thunderbird
On 15/11/2024 7:56 pm, Bill Sloman wrote:
On 15/11/2024 3:14 am, Edward Rawde wrote:
"JM" <sunaecoNoChoppedPork@gmail.com> wrote in message news:t5fajjdteskfftvkf84iqsp2vc4b9ta5kj@4ax.com...
On Fri, 8 Nov 2024 15:43:41 -0500, "Edward Rawde"
<invalid@invalid.invalid> wrote:
I finally got around to digging out my AD734 based Wein bridge simulation, and created a FET based version.
It's got a nasty 163kHz generator embedded in it somewhere, and I've put in an RL filter to keep that under control.
It looks as if the 163kHz was coming from the LTC6655-1.25V precision reference.
Putting in 4.7uF at C10 - rather than the 1.0uF I started off with - seems to make the simulation run a lot faster - about 20 times faster - and cleaned out the visible hash coming from the voltage reference.
The data sheet says use something between 2.7uF and 100uF and recommends film parts - ESR less than 0.1R. They don't like ceramic parts.
Pulling out the LCR filter (L5,L6, C19, C20, R22 and R23) may have speeded up the simulation too.
The 2kHz and 3kHz harmonics aren't as good as they were - only about 65db below the fundamental - so Ill have to do some more digging.
-- Bill Sloman, Sydney
Final final 1kHz oscillator
Re: Final final 1kHz oscillator