Here are the Zoom details for our next meeting:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Topic: Electronics SIG
Time: Nov 9, 2022 20:00 London
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Meeting ID: 867 2638 8732
Passcode: 929942
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Meeting ID: 867 2638 8732
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Hi Graeme. Apologies - missed that one on the calendar.....Must try harder ! Will there be a summary ?
Dave
No problem Dave. You are not the only one. I'm wondering if sending out an email reminder a couple of days before a meeting (like I do for ScOONs) would help? It might necessitate someone reminding me to send out a reminder though!
It was 'bijou' meeting with three of us in attendance. :)
I gave a quick update on my efforts to motorize my pizza layout using a geared stepper motor with a view to synchronizing the speed of the train and rotation of the 'pizza base'. I now have a suitable 'lazy susan' turntable bearing that is not too heavy in which the motor will fit. A bit later in the meeting I shared some correspondence from Jonathan Scott in New Zealand (https://www.scottpages.net/ReviewOfControllers.html ). He has quite a collection of old DC controllers and likes to figure out what makes them tick. His latest is an H&M 3000 he picked up in non-working condition on a trip to Australia and got it working with the aid of online information ( https://www.stable-cottage-potterne.co.uk/HM3000index.htm ). He has also been analyzing the Fidelity Controller, which is also from NZ, and reported there are some interesting variations on feedback controllers in it and he has created his own microcontroller controlled version. He sent me a couple of short videos of his vintage controller collection at a model railway exhibition in NZ.
We admired Hugh's illuminated control and mimic panel for his test layout. It features LED route illumination and point position indication along with one wire (and return) actuation of solenoid motors with position memory and makes novel use of photo-couplers / isolators which also perform logic functions. He has found a number of variations on CDU (Capacitive Discharge Unit) point motor drivers and discussed their operation and merits.
David told us about his testing of several inexpensive mobile phone type loudspeakers he had bought from Alibaba with a view to using them with DCC sound decoders by creating suitable resonator boxes for 3D printing. We then had a general discussion of what the next 'big development' in model railway electronics might be.
Stephen sent his apologies and after meeting raised the question of where people bought electronic components, particularly things like PCB connector blocks. Perhaps I'll start another thread for that one as it could be something that has a wider interest.
We decided our next meeting should be on Wednesday 18th January 2023 and I have made a request for a Zoom meeting booking.
Cheers for that Graeme - I'll try and manage the reminder myself !
For component supply, try "Switch Electroniics"....Good website, reasonable prices and good delivery service.
All the best,
Dave
I tend to use Rapid for parts..
http://www.rapidonline.com/