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Advance H1 Notes

Advance H1 Audio Frequency Generator

This is a rather nice thing I laid hands on this week.  Itʼs a valve-based 15Hz–50KHz sine/square wave oscillator, probably made in 1958 [1].  It doesnʼt seem to have been refurbished, but for its age and intended use it looks in good shape.  Functionally?  Well ... weʼll see.

some plug and socket naming

I was trying to explain this to someone verbally, but ended promising to do a diagram.  No, an IEC 60320-1 C-14 connector is not the same as a 60320-2-2 E connector.  Maybe someone else can explain it more clearly, but this is my take on it:

diagram of input and output plugs and sockets

(SVG version here)

scaling the depths

Hereʼs a weird comment:

"But it is important to say we simply don't have any evidence in this paper to suggest that any carbon coming from these seeps is entering the atmosphere."

This quote comes from Professor Adam Skarke of Mississippi State University.  Context: this is an article about recent research into releases of methane from clathrates in the seabed off the American coastline.  As we know, a warming ocean is highly likely to lead to a greater trend of release of methane than has hitherto been the case, because the equilibrium level of clathrate formation and melting changes with temperature.  The released methane mostly is oxidised in the sea, adding a 2:1 molecular ratio of water and dissolved carbon dioxide to it.

Itʼs understandable that Professor Skarke would want to hedge his comments a bit.  But hang on...

The fact that a strong solution of CO₂ is being added to the sea in this way is not unimportant:

tell me about it

That worked.  :-)

snapshot of email with preset title for spambots

Anyone who wants to post a comment or contact for other nonspamming reasons can do so by selecting a different ‘category’ from the menu.  This wonʼt catch every spammer but the botsʼll need to be programmed to read.  Should work for a few months?

 

Update 2014-10-26: One got through yesterday.  Ah well.

Поливокс / Polivoks Notes

(Anorak Adventures in Synthland 2)

polivoks

Hey, got a Polivoks.

First, some points of nomenclature.  Iʼve had no occasion hitherto to consider it, but I now realise the correct English plural of Polivoks is Polivoksen.  With that established, on the Polivoks:

  • Generator (Генератор) = tone generator = (audio frequency) oscillator = VCO.
  • Modulator (Модулятор) is mainly an LFO.  (The control can select noise as well as periodic functions, so LFO would be incorrect ... a less cumbersome term than Korgʼs ‘modulation generator’.)
  • Glissando (Глиссандо) = portamento (a.k.a. ‘glide’).
  • Pedestal (Пьедестал) = sustain level.

Iʼll use the Polivoks terms here, mostly.

This Polivoks was made in 1987, and came with lid, pedal and cables (5-pin and 3-pin DIN; donʼt know what the 3-pin one was for...).  No power cable but has an IEC C-14 power socket mod. [1]

External Condition

Case: not great; sticky tape residues, heavily scraped and rather indented.  So much for all the “built like a tank” guff.  Built like a fake tank for to confuse the enemy, maybe.  Sheet aluminium bends (like plastic, unlike steel) but doesnʼt rebound.  It seems to have had carry handles at either end; not sure if they were original, but gone now.  The rubber feet on the underside are different sizes – presumably two were replaced at some point.

MagSafe – the Last Straw?

(This post is the long-promised update to A Disturbing Shade of Green.  I had intended to take update photographs of the adaptor previously bitched about, but had no decent working camera for a while.  Now I have camera and two adaptors worth a gripe, so here goes.)

This happened over the last 48 hours.

Apple L-tip Magsafe connector cable with a cracked sheath

In 2013, after a long spell of financial difficulty during which it wasnʼt an option, I replaced my laptopʼs sadly deteriorated MagSafe [4] power adaptor.  That adaptor (Nº2) went up on a high shelf in the interim.  And the new adaptor (Nº4) was good.  But early this year I noticed the onset of the same deterioration.  I might have blogged about it all the way through, but the last few months have been intense...

The progressive deterioration whilst in normal use of the new (c.2011 and on) cable for these adaptors seems to go like this:

battery troubles

Oh.

macbook pro expanded battery (image 1)

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