Search found 5487 matches

by jack
Sat Jun 14, 2014 10:44 pm
Forum: Solid State
Topic: AD797 OPAMP input to a grounded grid valve stage question
Replies: 12
Views: 9115

Off the top of my head, the output of the 797 will not like this - in this configuration, it will be continually trying to compensate for the output offset - I suspect that it'll just get hot and be unhappy. I've used the 797 in a number of applications (metal detectors, ultra-low-noise amps, my Qua...
by jack
Fri Jun 13, 2014 12:59 pm
Forum: Buying and Selling
Topic: wanted - quad405
Replies: 8
Views: 4767

Can't have mine :)

What are you after - the whole thing or specific bits...?
by jack
Thu Jun 12, 2014 2:51 pm
Forum: Assorted Stuff
Topic: Grid Energy
Replies: 32
Views: 15186

https://www.indiegogo.com/projects/focus-fusion-empowertheworld--3#activity These people worry me - in their "science" section they state "It will be a combination of regular hydrogen and boron (like that found in laundry detergents) that when fused only creates alpha particles, bett...
by jack
Tue Jun 10, 2014 10:11 am
Forum: Assorted Stuff
Topic: NEXT DIY MEET 7/8 JUNE 2014
Replies: 226
Views: 85732

Ok. As someone who slightly sits astride the "professional engineer" vs. "true amateur" approach, I'd like my 0.5p's worth... You can be an amateur, not delve deeply into the technical literature and do everything from scratch by experimentation. Or, you can be an amateur with an...
by jack
Tue Jun 10, 2014 8:40 am
Forum: Assorted Stuff
Topic: LDR pre amps are the future...
Replies: 119
Views: 49705

No disrespect to the OP, but the photos show a complete lack of physical separation between the analogue & digital sections, no screening between boards, no internal screened leads, no mains common/differential/HF or LV HF filtering etc. etc. I know its currently a jury-rig, but there is a bunch...
by jack
Tue Jun 10, 2014 8:14 am
Forum: Assorted Stuff
Topic: LDR pre amps are the future...
Replies: 119
Views: 49705

The famous/classic Jim Williams AN43 0.0003% (3ppm) Wien Bridge sine wave oscillator design (page 29 onwards) uses Vactec VTL5C10 or Clarex CLM410 photocouplers - the LDR is a cadmium sulphide cell and is not very linear or repeatable as they say. I've built this design and use it for very pure tone...
by jack
Mon Jun 09, 2014 10:47 pm
Forum: Assorted Stuff
Topic: steptoes preloved stuff
Replies: 5
Views: 2689

Indeed!
by jack
Mon Jun 09, 2014 9:30 pm
Forum: News
Topic: Rik Mayall RIP
Replies: 6
Views: 5025

Rik Mayall RIP

Very sad. The Dangerous Brothers were my role models...
by jack
Sat Jun 07, 2014 9:09 pm
Forum: Assorted Stuff
Topic: NEXT DIY MEET 7/8 JUNE 2014
Replies: 226
Views: 85732

Dave the bass wrote:Have good fun up there gentle folk.

I'll be fine.....no really....I'll be OK *sniffs*
T'was a nice day here. My head hurts.
by jack
Fri Jun 06, 2014 2:03 pm
Forum: Assorted Stuff
Topic: NEXT DIY MEET 7/8 JUNE 2014
Replies: 226
Views: 85732

Mike H wrote:Your social calendar is too full. Prioritise. Top tip that. :D
Either, a) drive a 500-mile round trip and drink a lot of beer, or, b) walk up to the village and drink a lot of beer.

Decisions, decisions...

Note: Yes, I know there aren't any audio types at the fete, but its a *lot* closer...
by jack
Fri Jun 06, 2014 10:22 am
Forum: Assorted Stuff
Topic: NEXT DIY MEET 7/8 JUNE 2014
Replies: 226
Views: 85732

Can't do it now :( - apparently I'm running the beer tent with my son at the village Fete :)

Rats. Can someone pick up those transformers from Neal for me?

Ta.
by jack
Fri Jun 06, 2014 9:32 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4663887

Mike H wrote:Oo-er!
Indeed - made the poker below last Sunday from a single bit of 12mm mild steel bar - no power tools at all.

I put the nasty spike on at the last minute :)
by jack
Thu Jun 05, 2014 6:20 am
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4663887

Went blacksmithing last weekend - SWMBO bought it for me last Christmas.

Best couple of days I've had in a long time. Great fun.
by jack
Fri May 30, 2014 3:15 pm
Forum: Assorted Stuff
Topic: Nothing In Particular
Replies: 16439
Views: 4663887

Mike H wrote:This week's shopping list ~ disturblingly similar to last week's ~ and the week before that ~ and the week before that ~ wine, beer, cake, cheese, cake, rolls, cheesecake, pies....
Try a bit of variety by getting your life in order: beer, cake, cheese, cheesecake, pies, rolls, wine.......
by jack
Fri May 30, 2014 3:06 pm
Forum: Assorted Stuff
Topic: I'm Officially a Fat Bastard
Replies: 362
Views: 129109

Taking this seriously now - lost 2kg in last 8 days. Target is to lose between 10 and 11kg in three months. Starting: 104.7kg Today: 102.6kg Also reduced to 1 cup of caffeinated substance a day - I was drinking 4-5 BIG mugs (those huge French things) a day. Down to just one ordinary cup. Going on a ...