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G8MNY  > TECH     10.09.25 17:56l 61 Lines 2362 Bytes #3 (0) @ WW
BID : 40481_GB7CIP
Subj: 12V Fluorescent Tube Fly Zapper
Path: JH4XSY<JE7YGF<LU4ECL<VK2RZ<VK2IO<GB7BED<GB7JED<GB7CIP
Sent: 250910/0846Z @:GB7CIP.#32.GBR.EURO #:40481 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                (Updated Jul 09) 
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

    (ﾚｿ)
 ﾚﾄﾄﾄﾁﾁﾄﾄﾄｿ       I had to repair mine
 ｳ        ｳ       again recently,
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ      so I made a note
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ       of the circuit.
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ
ﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄ
 ﾀﾂﾄﾄﾄﾄﾄﾄﾂﾙ                                    10n ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄｿ
   ~~~~~~                         ﾚﾄﾄﾄｿ       500V===  1N4007 ｳ   ｳｳ500V-1kV
                                  ｳ0R5 )||==   ﾚﾄﾄﾄ)ﾄﾄﾂﾄｴ>ﾃﾄﾄﾄｴ   ｳｳDC on
      1A     1N4001               ｳ    )||  ||(    ｳ  ｳ       ｳ   ｳｳSpiral
+12V>ﾄo-oﾄo\oﾄｴ>ﾃﾄﾂﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ)ﾄﾄﾄｴ ||  ||(    ｳ  ｳ   u1 ===  ｳｳFly
      Fuse        ｳ  ｳ            ｳ0R2 )||  ||(41R ｳ _ｳ_  1kV ｳ   ｳｳKiller
                  ｳ  ｳ   ﾚﾄﾄﾂﾄﾄﾄﾄﾄ)ﾄﾄﾄｴ ||  ||(    ｳ /_\      ｳ   ｳｳWires
                 +ｳ  ｳ   ｳ ===5n  ｳ    )||==   ﾀﾄﾄﾄｴ  ｳ1N4    ｳ   ｳｳAround
            100u === ｳ  1K5 ｳ   ﾚﾄｴ  4R)||        === ｳ007    ｳ   ｳｳLamp
                  ｳ  ｳ   ｳ  ｳ ｳ/  ｳ    )||  2n2    ﾀﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾙ
                  ｳ ===  ﾀﾄﾄﾁﾄｴ   ｳ   ﾀﾄﾄﾄｴﾃﾄｿ    10n
                  ｳ  ｳ5n  TIP ｳ\e ｳ         :U:   500V
                  ｳ  ｳ    NPN   ｳ ｳ     UV  : :
  0V>ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ ｳ    Lamp : :
                                  ｳ         ;�:
                                  ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
It uses a standard E ferrite transformer core        ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
except there are two bobbins one on each end        ﾚﾁﾄﾄﾄﾂﾄｿ  ﾚﾄﾂﾄﾄﾄﾁｿ
rather the one in the middle. This magnetically     ｳInv ｳ ｳ  ｳ ｳZap ｳ
isolates the high voltage fly killer circuit &      ｳbob ｳ ｳ  ｳ ｳBob ｳ
it can be shorted out or not without affecting      ﾀﾂﾄﾄﾄﾁﾄﾙ  ﾀﾄﾁﾄﾄﾄﾂﾙ
the UV lamp inverter much.                           ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ


If the UV tube gives up, try a double sided PCB with 2 rows of blue LEDs
mounted instead of the lamp & across 12V...
            
       ﾚﾄﾄ180Rﾄﾄﾄｴ>ﾃﾄﾄﾄｴ>ﾃﾄﾄﾄｴ>ﾃﾄﾄｿ  
+12V ﾄﾄｴ   2x15mA,  6 Blue LEDS   ﾃﾄﾄ -ve
       ﾀﾄﾄ180Rﾄﾄﾄｴ>ﾃﾄﾄﾄｴ>ﾃﾄﾄﾄｴ>ﾃﾄﾄﾙ

And to reduce the inverter power, add a 10n across Collector to Emitter &
change the 1K5 to 12K for 75mA @ 12V total load.
 

See also my Tech bul on "Fluorescent 12V Dimmers"


Why don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP



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