== 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]] ([http://diyaudioprojects.com/Tubes/6EM7-SET-Amplifier/ 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 [http://www.ricomputermuseum.org/ 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]]
* [http://bucms.bu.edu/twiki/bin/view/Main/DialPhone Phone]
* [[EpromProgrammer]] -- Arduino programmer for 5V 32k EEPROMS
* [[6809Machine]]
* [[ReflowOven]]
* [[SquirrelFlasher]] - cheap LED strobe lights to deter squirrels from the attic

=== Reference

* [https://robrobinette.com/Amp_Stuff.htm Rob Robinette] amplifier pages
* [[WoodFurniture]]
* http://www.angelfire.com/electronic/funwithtubes/
* Useful tube reading:
 * [https://wtfamps.wordpress.com/welcome/ 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]]
* [http://diyaudioprojects.com/Speakers/Fostex-FE103En-Bass-Reflex-Speakers/ FE103En] small reflex cabinets (drivers $50 ea)
* [http://diyaudioprojects.com/Speakers/Fostex-FE103E-Zigmahornets/ 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]]