MCP – autothrottle switch, ‘active on’ version

As mentioned in the previous blog I have created a new variant of my solenoid autothrottle switch that is ‘active on’, i.e. by using a momentary ON toggle switch (1121S ON-ON + Momentary) the electromagnet (12V) must be powered to keep the switch in the ON position. Without current through the electromagnet the switch flips back to the … More MCP – autothrottle switch, ‘active on’ version

MCP, EFIS, MIP, SimVim, knobs and the throttle quadrant

The original prototype of the radio panel backplane PCB used almost all pins of an Arduino Mega. To get more inputs and outputs available, the authors of SimVim introduced the use of multiplexers for inputs and 7-segment display driver clocks and updated their software so that multiple LED drivers can be daisy-chained for up to … More MCP, EFIS, MIP, SimVim, knobs and the throttle quadrant

Digitally controlled friction and PCB ground planes

After replacing the servo D-axis to fix the backlash in the left throttle handle I’ve been testing a power transistor to drive the clutches as an alternative to the relays. This worked fine, but I noticed that there were still synchronization problems between the left and right throttle handles, mainly near the middle throttle positions. … More Digitally controlled friction and PCB ground planes

Arduino control of the throttle quadrant

Before ordering the large and relatively expensive throttle quadrant PCB some real-world testing of the circuits was done, controlled by the Arduino. The first test was to see that the clutches were correctly switched off by the limit switches. They were, e.g. when a handle reaches full throttle position, but often (but not always) the … More Arduino control of the throttle quadrant

PCBs, panels and throttle quadrant cosmetics

A lot of cockpit work has been going on simultaneously this summer: the new Cessna GPS printed circuit boards and switches with integrated LEDs have arrived. But also the universal B737 COM/NAV/ADF PCBs, so I’ve been working on both in parallel. And because I was curious what the planned backlighting would look like I’ve also … More PCBs, panels and throttle quadrant cosmetics