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M1BYT > TECH 14.01.05 22:21l 37 Lines 1678 Bytes #999 (0) @ WW
BID : 213315M1BYT
Read: GUEST OE7FMI
Subj: Re: Auto SCR Charger for Car Batts
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<DK0WUE<GB7FCR
Sent: 050114/1825Z @:GB7FCR.#16.GBR.EU #:30351 [Blackpool] FBB-7.03a $:213315M1
From: M1BYT@GB7FCR.#16.GBR.EU
To : TECH@WW
G8MNY Opined with considerable skill:-
> HOW IT WORKS
> With mains connected nothing happens until voltage from a correctly connected
> battery is applied (not 0V). Then TR1 will be turned through D1 & spike filter
> 22K & 1uF.
I designed and built a similar charger a number of years ago. I also found it
had problems charging deeply discharged batteries without some means to
kickstart the charge. My circuit used a heavy bridge rectifier, rather than
the SCR to provide rectification, so I was simply able to add a push button
across the SCR to get the charge under way.
It seems a push button wired across the emitter and collector of TR1 in your
circuit might have the desired effect and enable a completely flat battery to
be charged. The use of the push button has the risk of causing damaging the
charger, if the battery is connected in reverse or if the leads are shorted.
ÉÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
º 73 from Harry, M1BYT @ GB7FCR.#16.GBR.EU º
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º International Museums Weekend 18th+19th June 2005 º
º www.ukradioamateur.org/imw/index.html º
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º The ARC's FL/RAE courses + Newcomers Introduction º
º to amateur radio:- http://www.ukradioamateur.org/ º
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º QTH: Garforth, W. Yorks.. º Timed 16:54 º
º harry.m1byt@tiscali.co.uk º 14 Jan 05 º
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