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  1. Berry Greene

    Electronic chimes

    I am going to answer my own question here. Upon examining the micro-switch further I had to deduce that the action is neither N/C or N/O. This guy needs to be NN/O (Nearly Normally Open!). To counter the bounce problem the cam actually widens the N/O contacts and allows it to ping to momentary...
  2. Berry Greene

    Electronic chimes

    Its a question really. a Modern MDF Wall clock with all electronic plastic parts. The pendulum is a plastic replica of a grid-iron driven by an electronic unit. The Chimes are a separate little plastic box activated by a switch from within the quartz driven movement. That movement has a switch...
  3. Berry Greene

    1982 Metamec 4.19MHz quartz mantel clock, a couple of questions

    I have one of the Metamec's with the 4.19Mhz quartz Xtal movement. I bought it 2018 for £10 inc carriage (£3) and it wasn't working. I rummaged around and found the trimmer was busted. Not having one I fitted two 47pF caps in place of it and the other half of the 22pF voltage divider assuming...
  4. Berry Greene

    Fixing over-swing in Quartz movements w/ fake pendulum

    It seems so obvious put like that. Thanks for the post - excellent. I was taken with the post about midnight magnet grinding. Oh boy do I know that tired time when judgement is thrown to the wind in some kind of angry desperation. I usually prefer reversible solutions. This is a slightly...
  5. Berry Greene

    Kienzle World Clock - Trying to resurrect

    I have what I take to be a later one fitted with the 627? electronic balance. It works amazingly well vying well with quartz accuracy over a month. I do use a lithium cell in it as it gives increased and extended drive at 1.7V. Considerable power is needed to drive the heavy brass hands and...
  6. Berry Greene

    Post your quartz clock matters here

    I like to call it an electronic balance because it has a (solid state) transistor but is NOT a quartz. Nor is it an "electric" balance. Its a resonant motor in the sense that it provides the power to drive the train and pointers but unlike a normal mechanical balance that absorbs power - this...
  7. Berry Greene

    Post your quartz clock matters here

    Hello Les. How did you get on? I am waiting to hear! What an interesting movement. It looks to me as if the there is no rack to count the strikes but I do see a rotary switch with increasing lengths of printed contact. That's very likely to be the equivalent of a mechanical counting wheel with...
  8. Berry Greene

    Post your quartz clock matters here

    This is addressed to both sections of your post. I bought some silicone oil and have started to use it on troublesome movements of the cheaper quartz variety to great effect. Thanks. One exception of particular satisfaction is an older C1970 Smiths electronic balance. The type with the resonant...
  9. Berry Greene

    Post your quartz clock matters here

    That's such a useful yet not so obvious tip. Thank you sir!
  10. Berry Greene

    Post your quartz clock matters here

    Nice clock; Nice project. Martin has covered the ground. If you can make sure the mechanics will work and you have an electronic fault, it might help a little to identify the crystal frequency. I'm betting 4Mhz (by looking at your pictures), in which case you can probably source a replacement...
  11. Berry Greene

    Rempe Rempe self-winding - questions on electrics

    Thanks for the pics. Great help. I think you're right on to this from what you say. It sounds very good. Soldering is a knack that's easy to lose. I did some myself this week. Its a slick art and this modern silver solder is awful! I sometimes use some Bakers Fluid on older parts - even on wire...
  12. Berry Greene

    Rempe Rempe self-winding - questions on electrics

    Blimey matee you're more London than meself! I'm from West London and would not go south without me army. Crossing that River Thames was fraught with danger! I moved down to Sussex and escaped to become a member of the farming community and gentlefolk. Moo! I just though I might be able to...
  13. Berry Greene

    Rempe Rempe self-winding - questions on electrics

    Fascinating! There I was butting in hoping to help when all the while you're streets ahead of most things I say! No matter I am enjoying this because the issue comes up in one form or another over and over again. The use of DC (Battery) into an inductor or (coil) via a switch (commutator) has...
  14. Berry Greene

    Rempe Rempe self-winding - questions on electrics

    Gold offers low resistance contacts and is good for switching low currents such as RF. However, I think your currents and BEMFs will not suit gold which is a soft metal and may well migrate or burn away quite quickly. Any spark suppression is a good idea. However when the spark is entirely...
  15. Berry Greene

    Post your quartz clock matters here

    Hi to all. Enjoying your responses. Ignorance on my part has me asking what type of very low drain battery IS best for these movements? Maybe I have got this wrong as I reach for cheap alkaline's that have usually been OK. They aren't the best bet are they? Ah but at least they don't leak...
  16. Berry Greene

    Post your quartz clock matters here

    Good points well made Mark and thanks. I am finding the sweep (8pps) movements use up batteries PDQ. It could be that they aren't all the same. Surely depends on QC and I doubt there is any! I have no current drain figures thus far as it is too low for a digital meter. I need to rig a series...
  17. Berry Greene

    Post your quartz clock matters here

    My wife is gonna love you Roughbarked. She says I should never be let near glue or paint!
  18. Berry Greene

    Post your quartz clock matters here

    Hi Roughbarked & Simon. No argument there. They are total rubbish! Get what you pay for BUT I can't find any upmarket types. This is why I struggle to keep the older German and Japanese movements working. Graft in pcb's from Chinese variety. No small chips to make it. H bridge drive means too...
  19. Berry Greene

    Post your quartz clock matters here

    Hello Simon. I thought I could help until I saw your photo. It is not immediately familiar. Is it a Kienzle? Has the movement got a maker? Do I see a second hand arbour there? Before you started was the mechanism still tic-ing? With a low voltage battery (that is below the normal threshold of...
  20. Berry Greene

    Fixing over-swing in Quartz movements w/ fake pendulum

    Oh Kinsler do I know that dumb feeling. Yeah and me a retired electronics engineer and this circuit so simple. Foolish - what, - I should say so! I have one of these fey pendulum quartz Carriage style by Metamec UK. The movement is by them - it says. It was brought to me because of my...
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