Odds are good once I've got it going I'll part with it. Sent from my iPad On 2012-07-22, at 10:05 PM, Robert Borsuk <rborsuk at colourfull.com> wrote:

Paul Anderson wrote: I'd recommend keeping it as original as possible. If the capacitor is good it should regulate fine, and if the capacitor is bad, it needs to be replaced.

You're right, it is an emitter follower with a full-wave rectifier. The ripple is quite bad, I figure it at 3.5%. I'll have to hunt down an appropriate capacitor. Sent from my iPad On 2012-07-23, at 3:27 PM, ard at p850ug1.demon.co.uk (Tony Duell) wrote:

On 07/24/2012 02:59 PM, Tony Duell wrote: The "Sent from my iPad" thing is the default signature in the iOS mail client. Most people don't know enough to change it, even though it takes like 20 seconds. In fact, I'd wager most people don't even know they're sending it. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

________________________________ From: Dave McGuire <mcguire at neurotica.com> On 07/24/2012 02:59 PM, Tony Duell wrote: ?C: Tony needs to ALWAYS have that in his sig. ? The "Sent from my iPad" thing is the default signature in the iOS mail client.? Most people don't know enough to change it, even though it takes like 20 seconds.? In fact, I'd wager most people don't even know they're sending it. ?C: I have a Zepad. I wonder if it'll show up in any e-mail I send. I try not to push it too hard. It'll likely blow up.

________________________________ From: Alexandre Souza - Listas <pu1bzz.listas at gmail.com> ? ? I've changed mine to "Sent from my Motorola PT550 Cellular Telephone". People seems to like it. C: Isn't that like giving the farm away though. You let people know exactly what device you're using to utilize the internet. No mysteries there. I really don't get it.

On of my colleagues has "Sent from my Sinclair ZX Spectrum" in his sig. I think he is lying... Dave Wade G4UGM Illegitimi Non Carborundum

Sent from my stun gun? http://www2.electronicproducts.com/iPhone_case_doubles_as_a_stun_gun- article-fajb_iphone_stungun_jul2012-html.aspx --Chuck

On Wed, 25 Jul 2012, Tony Duell wrote: I've alway liked "Sent from my Banana PC Jr. 6000." --Ernest

On 7/25/2012 3:03 PM, Fred Cisin wrote: How about ... "One ringie dingie" Ben.

Right. I think that is a problem. Firstly, what is the ripple freuqency? If the capcitor is the problem it will be twice the mains frequency (so 120Hz for you I guess). If it's at mains frequency, the problem is likely to be that half of the full-wave rectifier isn't working, maybe an O/C diode, less pleasantly an open-circuit in half of the transformer secondary. As for the capacitor, I think you said the original was 4000uF [1]. I would fit a 4700uF, the extra capacitance won't matter and it'll be easier to get. [1] Why this is _necer_ [2] written as 4mF is beyond me [2] Actually, 'never' is too strong. I am pretty sure I've seen at least one schematic that does thta, maybe an HP one. -tony

I cna atually think of a reason. In the UK, 'mfd' or 'MFD' was commonly used as an abreviation for microfarad (not millifarad or megafarad). I think using mF on a schemtic for millifarads could cause confustion When I was at school, an idiot teacher (I rarely had any other kind) assured me that the unit of pressure was the millibar, and that it was incorrect to call 1000 millibars 1 bar. I didn't believe it then, I certainly don't believe it now. -tony

I would nt be at all surpised if that '4000uF capacitor' is nothing of the sort any more :-) -tony

My car gets forty leagues to the hogshead, and that's how I like it! -------- Paul Anderson -- VE3HOP On 2012-07-25, at 5:20 PM, Chuck Guzis <cclist at sydex.com> wrote:

I thought 'capcitor' had latin roots too ('capio' = 'I capture') One joker proposed that the unit of angular frequency (radians/second) should be the 'avis'. For those in outher countries, 'Hertz' and 'Avis' were 2 major car rental compaines. I ,little poem is coming to mind. I am not sure where I first read it, but anyeay... The tears do flow The dirge doth play Millimicron Hath passed away I met her first In High School Science Hardy and Perrin Sealed the alliance Allas, She's gone Her soul hath flit To join Her love The Angstrom unit I see Her face I hear Her cry Four hundred times In the violet sky Her form doth haunt Me, though unseen; Five hundred times In the oceans green. Her name I murmur When the lights are low Six hundred times In the embers glow. My friend, they say, Forget your Milly Nanometer's Better, rilly Well off with the old And on with the new! (Millimicron I still love you) -tony

On Thu, 26 Jul 2012, Chuck Guzis wrote: Are you familiar with the Potrzebie System of Weights and Measures? (Donald E. Knuth's first? published work) (I bought a copy on eBay, and next month, I'll ask him to sign it) -- Grumpy Ol' Fred cisin at xenosoft.com

That would be very uncommon in England. Most of the time, liquid voluems are given in 'cc' (cubic centimetres == millilitres to this accuracy). Althoguh for some unknown reason, most wine bottles (not that I eey buy such stuff() are labelled as 75cl (not 75ml). Go figure. 'Deci' and 'Deka' are not commonly-used prefixes in England. One time I do come across them is that tightneing torques are now often givein in dekanewton.metres. The reason for that is that they used to be given in kg.m (or more correctly kgf,m), and to this accurage, g=10m/s^2. Hence the numeric values all remained the same. And actually, what is normally important when tightneing soemthig nis that he bolts are _about_ the right tightness, but more importantly all are the same (so that the clamping force is even over a cylinder head or something). In which case the approcimation is fine. I think I've mentioend this before, but both torque and work have the dimensions of force * distance (e.g. Newtons * metres). But while it is correct to say that a newton metre of work is a joule, it is incorrect to do the same for torque. What is the fundamental difference? -tony

Half the time (at least) over here the mdeical prodession don't seem to know the units anyway. They quore some figure or other, but cna't explain to me what i really means. This does worry me... By rights it should do (500m is accrate to the metre, 0.5km is accrate to the 100m). But in practice it deosn't unless you're dealing wit ha scientist, who would probably say 5*10^2 (or 5e2) metres anyway. -tony