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G8MNY  > TECHNI   13.10.21 08:50l 55 Lines 2400 Bytes #999 (0) @ WW
BID : 49931_GB7CIP
Subj: Soldering Iron Economiser/Boost
Sent: 211013/0629Z @:GB7CIP.#32.GBR.EURO #:49931 [Caterham Surrey GBR]

By G8MNY                                           (Updated Dec 04)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

Suitable for 15-60W mains irons only!

  ............S T A N D....................           ....I R O N.........

   Fuse 旼컴컴컴컴컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴커
 L o-o컴(컴컴쩡컴컴커           +  10uF       3 core    Boost     
   1A      __    __          === 350V       cable     Press  SOLDERING
           \_/    /_\           읕컴컴컴22R컴컴컴컴컴컴> \       IRON
                                      1W                     ELEMENT
        읕컴캑      읕컴컴컴컴컴컴컴컴컫컴컴컴컴컴컴컴컴컴컨컴컴컴켸
                       Economize o           or 4 core
       4x          旼컴컴컴컴컴컴o <컴       with earth
      1N4006__    __     Normal  Gravity
            /_\    \_/             Switch
 N 컴컴컴컴컴좔컴컴켸
 E -------------------------------------------------------------------

When on the stand the mains fed to the iron is half wave only for economiser
mode (1/2 power), the iron rest on a suitably mounted stand micro switch that
is connected to one of the bridge diodes. When the iron is picked up, full wave
is restored for (normal power).

An added non locking press button switch mounted in the iron handle, this
boosts the power by connecting a 350V 10uF with a 22R in series (47uF/10R for
60W) housed in the stand (iron not earthed 3 core cable! Or use 4 core rubber
flex with an earth) resulting in approx 300V peak DC from the mains being used
for high power. This is approx 2x the normal power, hence the non locking press

Make sure all mains connections & switches are safe (properly shrouded heat-
shrink) to avoid shocks etc.

A neon (with series 220k) across iron can be used to indicate the power status.

     _._+340V             _._                 _._    _._        _..__ _..__
    /   \                /   \               /   \  /   \      /     '     '
0V.............   0V......______   0V......납.....   0V............... 
    NORMAL \_ _/          ECONOMY            FULL POWER         BOOST POWER
    MAINS    ' -340        POWER              RAW DC           SMOOTHED DC

Also see my Tech Bul on "Thermostatic Soldering Iron LED".

Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP

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