GrahamH's photos with the keyword: board

The Yamaha MC2404 uncovered while finding and repairing a fault. The mixer assembly for channels 21-24 is removed so the solder joints can be inspected to identify a faulty joint. Several joints were resoldered and the fault didn't reoccur. This board was replaced with an Allen & Heath Qu-32 in mid 2022. June 2019

The new sound board is in service. The pastor and musicians are happy with the sound. The basic operations are good. It provides the same functionality as the former one. Now to learn its finer points and its means to expand functionality and to enhance music. May 2022. See detail photos of the board here: www.ipernity.com/doc/grahamh/51226380

The church I go to has bought a new sound board. Several of us need to learn how to use its many features. Mouse over to see more detail. March 2022. An Allen & Heath Qu-32.

My wife's 3-4 years old Dell Inspiron 15R 5520 laptop failed. The power pack is shut down when it is plugged into the power socket, but otherwise works ok. I opened the laptop and found dried gunk and brown deposits and stains around a partly destroyed SMD. See note. I cleaned most the mess, as shown here, reassembled it but the fault remained. Tomorrow, Monday, I'll contact Dell Australia about parts, boards and new laptops. November 2015.

My wife's 3-4 years old Dell Inspiron 15R 5520 laptop failed. The power pack is shut down when it is plugged into the power socket, but otherwise works ok. I opened the laptop and found dried gunk and brown deposits and stains around a partly destroyed SMD. See note. I cleaned most the mess, as shown here, reassembled it but the fault remained. Tomorrow, Monday, I'll contact Dell Australia about parts, boards and new laptops. November 2015.

My wife's 3-4 years old Dell Inspiron 15R 5520 laptop failed. The power pack is shut down when it is plugged into the power socket, but otherwise works ok. I opened the laptop and found dried gunk and brown deposits and stains around a partly destroyed SMD. I cleaned most the mess, as shown here, reassembled it but the fault remained. Tomorrow, Monday, I'll contact Dell Australia about parts, boards and new laptops. November 2015.

My wife's 3-4 years old Dell Inspiron 15R 5520 laptop failed. The power pack is shut down when it is plugged into the power socket, but otherwise works ok. I opened the laptop and found dried gunk and brown deposits and stains around a partly destroyed SMD. This is the underside of the panel which supports the keypad. The circuit of the touchpad is the green circuit board. Tomorrow, Monday, I'll contact Dell Australia about parts, boards and new laptops. November 2015.

My wife's 3-4 years old Dell Inspiron 15R 5520 laptop failed. The power pack is shut down when it is plugged into the power socket, but otherwise works ok. I opened the laptop and found dried gunk and brown deposits and stains around a partly destroyed SMD. I cleaned most the mess, as shown here, reassembled it but the fault remained. Tomorrow, Monday, I'll contact Dell Australia about parts, boards and new laptops. November 2015.

My wife's 3-4 years old Dell Inspiron 15R 5520 laptop failed. The power pack is shut down when it is plugged into the power socket, but otherwise works ok. I opened the laptop and found dried gunk and brown deposits and stains around a partly destroyed SMD. I cleaned most the mess, as shown here, reassembled it but the fault remained. Tomorrow, Monday, I'll contact Dell Australia about parts, boards and new laptops. November 2015.

My wife's 3-4 years old Dell Inspiron 15R 5520 laptop failed. The power pack is shut down when it is plugged into the power socket, but otherwise works ok. I opened the laptop and found dried gunk and brown deposits and stains around a partly destroyed SMD. I cleaned most the mess, as shown here, reassembled it but the fault remained. Tomorrow, Monday, I'll contact Dell Australia about parts, boards and new laptops. November 2015.

Delegates to an unknown conference at University of Sydney in 1949. Copyright CSIRO. Print found in my late Father's photos. Nearest to camera is Sir John Madsen, second row behind also on the RHS in the light coloured suit is Dr David Martyn. My Dad is behind to the left of Dr Martyn. To the left of Dad is Joe Pawsey. adb.anu.edu.au/biography/madsen-sir-john-percival-vaissing-vissing-7456 adb.anu.edu.au/biography/martyn-david-forbes-11076 More background info in: A passion for physics: the story of a woman physicist By Joan Freeman ( The above photo is also in this book ). books.google.com.au/books?id=QSkeg9wmMDAC&pg=RA1-PA70... www.eoas.info/biogs/P000614b.htm www.asap.unimelb.edu.au/bsparcs/aasmemoirs/martyn.htm Another bright star in the same field: Ruby Payne-Scott. csiropedia.csiro.au/payne-scott-ruby Off topic but interesting reading. csiropedia.csiro.au/radar Frederick White www.science.org.au/fellowship/fellows/biographical-memoirs/frederick-william-george-white-1905-1994 Memories of Sputnik: 50 Years of Space Travel, 1957-2007 Nineteen fifty seven was the year I started school and the year space travel commenced. October this year is the 50th anniversary of the three week long flight of Sputnik I. At that time my Dad was working as a scientist in Australia's CSIRO Radio Research Board (RRB) under Dr David F Martyn based in the Sydney area. (He started in this work in January 1946 and left it around 1960). This research group was investigating the structure and behaviour of the upper atmosphere. The experimental side of this work involved transmitting radio signals up and observing to the reflected signals returned. This meant that there was a selection of antennas, receivers and expertise available to receive signals from the first spacecraft. One Saturday afternoon Dad drove us to a building in the grounds of the University of Sydney. I remember being in a room dimly lit by outside light through high blinded windows. There were large grey equipment racks, some with dark knobs, glowing dials and lamps on front panels. I remember one with a round green CRT display. There was the dull red glow of valve heaters visible where there were no front panels. On a work table there was an incomplete looking metalwork thing and some cylindrical objects with wire pigtails. I had seen a similar sight in a WWII bunker used by RRB near Camden Airport, back before I started school. The room had a wonderful mysterious feel. Knobs were adjusted then we waited, Dad attempting but failing to explain Sputnik. Then it started, bleeep bleeep bleeep bleep. The explanations then became simpler. The sound was coming by radio from 90 miles above from the first manmade orbiting satellite. My first thought was this was like many other bleeps I had heard while near equipment racks. But I then realised the usually unemotional Dad was keen to share both the facts and his excitement, about this scientific and technical advance. Soon the bleeps ceased. We left the magical room and went back to normality and home. My recollection is that Sputnik I was not visible to the unassisted eye due to its small size but that the final rocket stage was. However, Dad said these didn’t pass over Sydney at dusk or dawn and so he couldn’t show it to me. I think the rocket stage was visible further south. In the next month, on November 3rd, Sputnik II was launched. This was visible in the evening sky from my home; we saw its star-like appearance hurrying across the sky with its dog and, I assumed, its bleeper.

The manually operated display of stations which departing trains travel to. This was the standard display used on the Sydney suburban rail system prior to the digital era. The rectangles above the names previously contained a clock face which was set by station staff to the time of next departure. The station names are on square-section bars which roll to display other names or no name.

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc.

The cover off the counter to plan modifications to run from 12v car battery etc. It surprised me that the power transformer was centre tapped to earth and each side feeding a single diode ala valve rectifier ccts of old.

The cover off the counter to plan modifications to run from 12v car battery etc. It surprised me that the power transformer was centre tapped to earth and each side feeding a single diode ala valve rectifier ccts of old.