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G8MNY > TECH 13.07.09 23:06l 40 Lines 1601 Bytes #999 (0) @ WW
BID : 31668_GB7CIP
Read: GUEST
Subj: Thermostatic Soldering Iron LED
Path: IZ3LSV<IK2XDE<DB0RES<ON0AR<F4BWT<F1ZNR<ON0BEL<ZS0MEE<GB7CIP
Sent: 090713/2202Z @:GB7CIP.#32.GBR.EU #:31668 [Caterham] $:31668_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (Updated Dec 04)
(8 Bit ASCII Graphics use code page 437 or 850)
This circuit is suitable "Magnetic Curie Point" temperature switch controlled
mains irons! The LED lights up when the Iron is plugged in & is drawing current
in its heat cycle it goes out when it is up to temperature. It also works on
some internally electronic controlled 24V irons too.
Also shown is a static earth, that keeps the stray tip voltage down to about
12V AC MAX, while still giving an un earthed iron for work on live circuits
(~100V) safely.
CIRCUIT
Fuse ON
LÄo-oÄÄÄo\oÄÄÄÄÄÄÄÄ¿ Temp
)|| ÚÄÄÄÄÄÂÄÄÄoÄÄÄÄÄÄÄÄÄÄo_oÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
LED )||( 10k Switch Curie ³
ÚÄ´<ÃÄ¿ 230V)||(24V ÚÄ´ :...Magnet Iron 12R Element
³ ³ )||( ³10k Bit 48W
ÃÄ´>ÃÄ´ )|| ÀÄÄÄ)ÄÁÄÄÄoÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
NÄÄÄ´ ÃÄÄÄÄÄÄÄÄÙ ³ ³-----------------------------iron earth
ÀÄ68RÄÙ ³ 1M If 3 wire
EÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÙ
The LED is connected to the mains neutral, but even so good insulation is
needed! The bypass diode connected the reverse way is a 1N4001 & stop mains
reverse voltage appearing across the LED. The value of 68R is selected so that
the LED is not lit with the transformer magnetising current.
Also see my Tech Bul on "Soldering Iron Economiser/Boost"
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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