Tim,
I have an external Lester charger that I could open up and get you
part specs (assuming they're readable). The internal charger got
removed long before I bought the tractor and the timer-based Lester came
with it when I got it. I actually have two Lester chargers - one with
the simple timer and the other an automatic that keys off voltage and
current draw (I'm guessing) to determine when the batteries are charged.
I normally use the automatic one and found it by chance at a local pawn
shop for about $25. Let me know and I'd be glad to help.
--joe
-----Original Message-----
From: Markus Lorch
Sent: Mon 1/31/2005 8:50 AM
To: 'Chapin, Tim'; elec-trak cosmos phy tufts edu
Cc:
Subject: RE: (ET) Charger repair.
Tim,
I think the capacitor that is used in the elec tracts may not
be the one needed for the lester charger (actually I would be
surprised if their transformer design required the exact same
capacitor). But this is just an assumption. If I saw right
then the capacitor on the elec-traks is not used on the
output but on an extra winding. That winding would have to
be the exact same design on the lester for the capacitors to
match. Or your lester may use the capacitor on the output and
thus require a lower voltage, but higher capacitance capacitor?
If I remember right than a higher capacity will lead to
a higher output value (up to a certain threashold).
Others may be able to explain better.
Markus
> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [ mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of
> Chapin, Tim
> Sent: Montag, 31. Januar 2005 10:29
> To: Chapin, Tim; elec-trak cosmos phy tufts edu
> Subject: RE: (ET) Charger repair.
>
>
> Well got the cap. from the surplus web site and had 10 mins
> to play, so
> I ripped out the old cap. from the Lester charger and put in
> the surplus
> one. Put the meter on it and turned it on. What the heck the
meter
> read 37.9 volts. What is going on here, I had new diodes so I
stuck
> them in, still 37.9 volts. Pulled the wires on the cap and
> stuck on the
> other surplus cap. Now it reading 37.4 volts. Wired in the
original
> cap and the meter went back to 39.7 volts.
>
> It appears the surplus caps are not any good or the wrong cap
for the
> Lester charger. It cost more to ship them back so I guess I
need to
> find new ones... The golf car sites have them for $21.00
each. Is
> there anything good out there cheaper?
>
> -----Original Message-----
> From: Chapin, Tim
> Sent: Wednesday, January 19, 2005 1:27 PM
> To: elec-trak cosmos phy tufts edu
> Subject: (ET) Charger repair.
>
> I just picked up a parts charger and want to see if it is any
> good. It
> currently is missing the heatsink and diodes. I got a couple
> of diodes
> coming and was wondering if I got a piece of aluminum about
the same
> size as the heat sink in a different charger and make my own.
> There is
> no magic about heat sinks that I don't know about is there?
>
> Also thanks for all the info about chargers. I went threw
> the archives
> and have decided the other charger needs a Capacitor (putting
out 39v)
> so I ordered one of the 1.99 ones off the web site that was
posted.
>
> I am in the process of resurrecting a couple of old Lester
> chargers for
> a couple of old resurrected golf cars.
>
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