Eric's retro tech projects

Model Planes

• ​https://www.flitetest.com/articles/se5-biplane-modified-and-simplified-build

Tube Amps

• ​http://ohm.bu.edu/~hazen/TubeAmp/ (gallery of projects)
• OddBlockOctal -- design notes on large oddwatt stereo amp
• ThirdTubeAmp (built) -- ideas for a small SET computer amp
  • Vertical6EM7Build (​forum)
• TubePhonoPreamp (built)
• TubeBoomBox (built)
• GretchensAmp -- Amp for my sister Gretchen (var on Marblewood, built!)
• BedroomAmp -- 6CY7 on PC board for the bedroom (built on PCB)

Other

• FridgeMonitor -- WiFi? fridge/freezer monitor
• PowerMonitor -- monitor whole-house electricity use

Ideas for new projects (tubes)

• 6V6PPAmp -- 10WPC old-school 6V6 push-pull
• NixieClock -- old and new projects. New version underway in late 2019!
• AllTubeClock -- various ideas for an all-tube clock
• TubeRadios -- projects / repair info
• TubeBiasMonitor -- a box with a small graphical display to aid in tube bias setting
• TubeHeadphoneAmp
• CoolLookingTubes -- possible projects with GU29, GU31 etc
• SoundForTV -- sound setup for TV
• 6DJ8Phono -- partially layed-out PCBs
• CarTubeAmp -- this is totally crazy
• OtherTubeAmps -- collection page for ideas

Ideas for new projects (other)

• BathroomAudio ideas for in-wall/ceiling audio
• ForthMachine ideas for a stack CPU
• GalBlaster tools to program GAL22V10 and friends
• AudioDAC for cleaner output computer sound
• HeatingSystemControl -- smart thermostat/monitor
• ModelT -- TRS-80 Model 100 and friends
• ComputerHistoryProjects -- notably proposed/actual projects for the ​RICM
• SunriseLamp -- fading LED / alarm for Sara
• StackMachine
• PiZeroW -- raspberry Pi zero W fun
• ESP8266 -- a simpler Arduino-compatible uC with WiFi and a few GPIOs
• HPCalculatorRevival -- old HP calculators
• Z80Laptop
• LinuxLaptop using maybe an RPi4
• 68kMachine
• LedWeatherMap WeatherClock
• ​Phone
• EpromProgrammer -- Arduino programmer for 5V 32k EEPROMS
• 6809Machine
• ReflowOven
• SquirrelFlasher - cheap LED strobe lights to deter squirrels from the attic

Reference

• ​Rob Robinette amplifier pages
• WoodFurniture
• ​http://www.angelfire.com/electronic/funwithtubes/
• Useful tube reading:
  • ​WTF salty but quite helpful page on tube amp basics (including nice section on building chassis)
  • ​https://robrobinette.com/Drawing_Tube_Load_Lines.htm - lots of great stuff!
  • Books:
    • "Valuve Amplifiers" by Morgan Jones (BU has free online access)
    • "Building Valve Amplifiers" by Morgan Jones
    • "Designing High-Fidelity Valve Preamps" by Merlin Blencowe

Speakers

• VariousFullRangeProjects
• ​FE103En small reflex cabinets (drivers $50 ea)
• ​Zigmahornets -- also FE103EN but 5' tall and skinny
• Drivers: FE166NV (6"), Tang Band W6-2144 (6") Markaudio CHR-120-Champagne
• Minimus7Upgrade ideas for upgrade of Minimus-7 speakers (which I seem to have 3 pairs of)
• Speaker calculations
  • ​https://www.ajdesigner.com/phpsubwoofervented/port_length_equation.php#ajscroll
  • ​http://www.troelsgravesen.dk/vent_tuning.htm

Flying

• Great training on upper air: ​https://www.weather.gov/jetstream/upperair_intro

Sara's School Committee

• BrooklineVote