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G8MNY > TECHNI 01.02.26 18:11l 70 Lines 2747 Bytes #6 (0) @ WW
BID : 51132_GB7CIP
Subj: FT290/690/790 DC Power mod.
Path: JH4XSY<IW0QNL<OK0NBR<OK2PEN<VE2JOS<VE3CGR<VK2RZ<GB7CIP
Sent: 260201/0904Z @:GB7CIP.#32.GBR.EURO #:51132 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (new Graphics Feb 06)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
_____________________________________
ｳ _ ﾚﾄﾄﾄﾄｿ ﾚﾄﾄﾄﾄﾄﾄﾄﾄｿ /~\ ｳ
ｳ (_) ｳ====ｳ ｳ 4.5000 ｳ "" "" \./ ｳ
ｳ ﾀﾄﾄﾄﾄﾙ ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾙ ﾜﾜ ﾜﾜ ｳ
ｳ ./"~"\. ﾜﾜ ﾜﾜ /~~\ ｳ
ｳ /~\ /~\ | | ﾜﾜ ﾜﾜ | |ｳ
ｳ \./ \./ `\._./' ﾜﾜ ﾜﾜ \../ ｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ
THE ORIGINAL CIRCUIT
+ve outer
Power o )ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄ>Rig supply
Switched ｳ ^ﾄﾄﾄﾄｿ 2.5mm ｳ
Jack _ｳ_ ﾃﾄﾄﾄﾄｴ<ﾃﾄﾄﾄﾄ<charge ｳ
/_\ +ｳ ｳjack ｳ+
Idiot ｳ ﾄﾄﾁﾄﾄ NICAD ｳ ===
Diode ｳ === PACK ｳ ｳ1000u
_ｳ_ _ｳ_ _ｳ_ _ｳ_
WHAT'S WRONG
1/ The original external power jack uses the dangerous +ve outer standard so
that the when connected to other kit there is a risk of shorting.
2/ The jack switch is supposed to disconnect the +ve battery lead when the
external power is applied. This depends very much on the make/type of plug
used, & it is easy to draw high current though the battery pack & cook the
cells & holder & possibly the rig!
3/ An reverse polarity idiot diode is provided, but on the -ve connection. So
if the rig is connected to other kit (e.g. a powered speech processor) the
protection is negated, & the mic lead now carries the rig current!
4/ The Plugtop raw charging (hummy battery) is via a 2.5mm jack socket that
shorts out the charger while being plugged in/out. There is no indication
that the charger is not being shorted out!
Here is my circuit that solves most of these problems...
+ve centre
power Jack (oﾄﾄoﾄoﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄｴ>ﾃﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄ>Rig supply
Switch ｳ wire 2.5mm LAMP ｳ
unused ｳ fuse charge>ﾄﾄﾁﾄﾄｴ>ﾃﾄﾄﾂﾄﾄｴ>ﾃﾄﾄｴ
RE-MARKED ｳ 1A ｳ ｳ ｳ+
ｳ ｳ NICAD ﾄﾄﾁﾄﾄ ===
ｳ ｳ PACK === ｳ1000u
_ｳ_ _ｳ_ _ｳ_ _ｳ_
It uses most of the existing components. The fuse is just 1 cm of very fine
relay wire in case of disaster. The lamp is a wire ended 12V fairy light that
provides low trickle current when the rig is 10-14V powered.
Some rigs also include a small 1000uF 16V by the jacks. The 12V jack is
remarked with a +ve centre with a RED felt pen.
The disadvantage is that there is now a diode in the battery supply lead to the
rig, I feel this is a worth while loss for protecting the battery pack from
damage!
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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