Thursday, November 19, 2015

Never Got Around To It, Pt. 2

More orphan pictures.

Yard sale chorus pedal, needed the battery snap repaired.ch1 ch2 ch3

Fixed this Petzl headlamp cord for a friend.petl1

fairyland figures 
Picked up this 80’s Yamaha MIDI sequencer. Some neanderthal had spilled liquid into the buttons so I cleaned them. qx53 qx52

bug3 img_thermal-504692187 wang
A “Baby 10” sequencer that is still sitting on the breadboard 6 months later…DSCF3378 DSCF3439 An audio breakout box. Useful for troubleshooting and synth experiments. Each column is connected.breakout01

This video shows the Baby 10 in action with my hacked Monotrons.

Never Got Around To It, Pt. 1

I have a bunch of half-finished projects, various random vacation pictures, etc. Rather than completely ignoring the blog I thought I would throw them up. I may not even explain them, depending…

Vancouver, Seattle summer vacation:

ahhhh dumping elmo granola horn mustard nonfiction sunyatsen tarts 0706152214

Neskowin summer vacation II:

DSC07208 DSC07218 DSC07225 DSC07227 DSC07236 DSC07244 DSC07251 DSC07272DSC07282 DSC07279 DSC07313 DSC07314 DSC07320

Brooks Steam Up:

annualtractor alf philcab snorkel

Thursday, August 27, 2015

HP-21 Calculator

Picked up this HP-21 calculator at a yard sale.DSCF3670 DSCF3671 Plugged in and it doesn’t seem to work and the display is not refreshing quickly.DSCF3673 Power adapter is putting out what I think is the correct voltage more or less.DSCF3681 DSCF3682 DSCF3684 DSCF3687 Batteries looked ok, but are probably bad.DSCF3690 With the batteries out (something you’re not supposed to do) the calculator display is stable but pressing buttons does nothing.DSCF3694 Removed two rubber feet and the screws underneath.DSCF3695 Careful prying separated the halves. DSCF3698 DSCF3700 DSCF3703 DSCF3705 DSCF3707 The board interconnectors are pretty neat.DSCF3708 DSCF3711 So this is a problem (corroded and lifted trace)DSCF3714
And this as well…  DSCF3717 DSCF3718 More corrosion.DSCF3720 DSCF3721 DSCF3723 DSCF3724 DSCF3725 DSCF3727 DSCF3728 DSCF3731
So I’ll have to see about removing all of the corrosion and rebuilding the broken traces. I hope I won’t have to desolder any of the ICs but some of the corrosion runs underneath. Fun!