Search found 245 matches

by billshurv
Sat May 18, 2019 4:00 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 860
Views: 323615

Re: Entropy

Makes sense. Round here there is a lot of flint so even with reinforced tyres and goop on the bicycle I get one total destruction puncture a year. This years mini arrow head put a 5mm gash in tyre and inner tube. The goop escaped. But I do cycle to work all year round. Happy discovery of the day was...
by billshurv
Sat May 18, 2019 3:17 pm
Forum: Document
Topic: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983
Replies: 13
Views: 119

Re: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983

Found it. This is the list from Gerhard posted on DIYAudio. The CPH5902 is the one that looks most interesting even if you have to ignore the built in bipolar. Of course linear might finally pull their fingers out and sort out production of the LSK489...
by billshurv
Sat May 18, 2019 3:08 pm
Forum: The Peabody Lounge
Topic: Entropy
Replies: 860
Views: 323615

Re: Entropy

yeah I did save some glorp from my last cycle tyre fixing round for this but didn't get around to it. Second job in the morning after coaxing the strimmer back to life after 14 months or so. I'll never learn...
by billshurv
Sat May 18, 2019 9:16 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 860
Views: 323615

Re: Entropy

Happiness is a tuned up lawnmower. It's back to its old self again for the first time in a couple of years. Interestingly the clogged vents I cleared thinking they were part of the cooling are vital to the grass collection as that's where the air gets in to help blow the clippings into the bag. as t...
by billshurv
Sat May 18, 2019 5:31 am
Forum: The Peabody Lounge
Topic: Entropy
Replies: 860
Views: 323615

Re: Entropy

Well job was easier than I feared. Decrud and re-route a cable that was snagging the mech and it is doing its little nod again when you engage the clutches. Everything cleaned and blades sharpened, but grass is too wet to mow after last night's rain...Typical.

On a roll :)
by billshurv
Sat May 18, 2019 5:24 am
Forum: Document
Topic: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983
Replies: 13
Views: 119

Re: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983

Of course I made a very detailed note of a good replacement and saved it somewhere so safe I can't remember. If I find it I'll let you know and we can pop it somewhere where a list of good low noise FETs would be useful.
by billshurv
Fri May 17, 2019 7:44 pm
Forum: Document
Topic: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983
Replies: 13
Views: 119

Re: "Composite Op Amp For High Performance," Siliconix, AN81-3, July 1983

Well I do have a few BF862s hanging around so if I don't use them all up on other things got to be worth a try. I should have got more when the EOL notification came out, but was too backlogged on projects to think it was a good idea. Luckily there are some other parts that are almost as good in the...
by billshurv
Fri May 17, 2019 5:24 pm
Forum: Document
Topic: "Composite Op Amp For High Performance," Siliconix AN81-3, July 1983
Replies: 13
Views: 119

Re: "Composite Op Amp For High Performance," Siliconix, AN81-3, July 1983

I've always wondered about making one of these as it gets mentioned quite a bit, but not seen the article before. However given some of the really nice FET input opamps available now is there any real reason to do it other than fun?
by billshurv
Fri May 17, 2019 5:19 pm
Forum: Test, Measurement and Repair
Topic: entropy continued?
Replies: 34
Views: 2254

Re: entropy continued?

Hmm well that shakes the room. Need to run a frequency sweep and get the levels adjusted as its a tad high at the moment :). Job for tomorrow.
by billshurv
Fri May 17, 2019 4:56 pm
Forum: Test, Measurement and Repair
Topic: entropy continued?
Replies: 34
Views: 2254

Re: entropy continued?

wife is away for weekend so time to try and get this sub woofing. drive unit out no problem but then realised that the sub is on its side so the main board is at the top. Stick camera in and take a pic. Locate what looks to be a relay and reach in. Yup, feels like a relay too. Hit it then powered up...