Meetings – 2019

 


Meeting Proceedings for 8th of February 2019

The meeting started on a rather sombre note as we visited Eric Clarke’s history and contribution to the club. He was remembered with some fondness. Rick M gave a most detailed and insightful view of Eric’s dedication  to the SAMG. We will miss him. Our annual general meeting was then held. Committee members were elected and all the other stuff that goes with the AGM. I won’t take up space here as the meeting minutes will be posted on our website. Our constitution was revisited (again). Some progress was made. A big question hangs over this important club document regarding finances. Australia is heading away from cheques so we must progress with the times. Peter Gheude and Cliff Shirra will go the bank and see what electronic means may be optioned for easier banking.

We only managed a single presentation. Darren gave a sterling one on his Commodore reproduction badges and a couple of devices he has produced to test the power supplies of these rather old computers. Very impressive.


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Meeting Proceedings for 11th of January 2019

The group all pondered new projects that could be undertaken over the next couple of months. Several suggestions were put forward. Wayne suggested the simple control of a stepper motor via a joystick. This would demonstrate the concept of analogue to digital control. Cliff did a short demonstration of mapping characters to the TFT LCD screen. He has mentioned (again) the code will be put on our website. The concept of diodes for reverse polarity protection was discussed. Rick, and others,  suggested it would be better to use FET’s instead as they have lower on resistance and lower revers current flow. Cliff has decided that the use of a p-channel MOSFET in his project is the better and more robust solution. 1 resistor and 1 Zener diode along with the MOSFET should satisfy his project needs. Peter demonstrated how the PINE64 can write to a port pin to flash it on and off. Peter implemented a “script” that flashed the SOS message via the LED. More tuition is required in the LINUX environment which hopefully will be done by some of our members. Our component tester project can be wrapped up. A few of our members contributions has finally paid off. We examined the code for the tester and “turned on” the ability for Zener testing as well. Peter sourced a DC pump that boosted the 9 volts to 50 volts so a larger range of Zener diodes can be tested.


Agenda for SAMG meeting Friday 11th of January 2019 at 7:30pm

  1. Group discussion on a new (yes a new) electronic project that people may be interested in doing. The aim is to select something that people would be really interested in completing based on cost, amount of time to complete and usefulness. Hopefully a micro-controller will be considered. Possibly we should consider the ESP8266, ESP32 that has bluetooth, wireless etc.
  2. Cliff will demonstrate the stage he is up to on his TFT LCD “project”
  3. Also there will be a discussion on the use of diodes to protect circuits against reverse polarity connections.
  4. Peter will demonstrate writing to ports on the Pine64 (we can see our single board computer finally flashing a LED)
  5. Further discussion and examination on our component tester project.
  6. Ad hock presentations. Please.