Re: [T3] clock

["Dave Hall" <dave@hallvw.clara.co.uk>]

Both the transistorised ones I couldn't fix had different faults.
One had scratched the very fine coils with its pendulum, so one was
open circuit, and the other clock had a corroded wire where it
joined at the circuit board.  The wires are very fine, and I
couldn't get it joined up, but others may.
If it is the transistor, it is still a tricky job to get another one
in there.  I think you have to drill the rivetted brass stands the
board fixes on (again, from memory, but I tried it once, without
success!) and then you have to fix it back on somehow.

The design is clever, but a bit frail.  The single transistor holds
electromagnet 1 on, attracting the pendulum.  This movement
generates back emf in e/m 2 which switches off the transistor, so
the pendulum swings back, then the process repeats.

Of course, you can fix a small quartz movement (a few $$) and run it
off a battery or dropper resistor, keep better time, and still look
original.

I have found both types dated '71 with grey faces; I guess they
gradually changed over.

Dave.
UK VW Type 3&4 Club
www.hallvw.clara.net/
-----Original Message-----
From: Jim Adney <jadney@vwtype3.org>
To: type3@vwtype3.org <type3@vwtype3.org>
Date: 24 October 1998 23:57
Subject: Re: [T3] clock


On 24 Oct 98, at 15:39, Dave Hall wrote:

> There are 2 types of Type 3 clock; the earlier one (to around '71)
> goes click about once a minute as the spring is wound up again
(they
> all have a grey face), and the other is a transistorised mechanism
> that uses a small pendulum to keep the time (normally black-face,
> but I have seen some replacement ones with a grey face).

The last year of grey faces (71) has the electronic works.  That
year
also has the late retaining springs on the housing, but if you want
to put it in an early car it is fairly easy to swap the works into
the early housing.

I have yet to get the late works to run reliably.  I really haven't
figured out the problem yet.  My latest theory is that  1 or more of
the transistors go bad and that putting in a rather generic
substitute might give them a new life.  I have not tested this
theory
yet.

Jim
-
*******************************
Jim Adney, jadney@vwtype3.org
Madison, Wisconsin, USA
*******************************

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