electronics

Tool throat LED

CAD stick-on templates, polycarbonate sheet & LED module
knoba - tool throat LED

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Module detail, 240v ac in, 20w out
knoba - tool throat LED

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All 8 holes drilled, cut out centre with fret saw/coping saw
knoba - tool throat LED

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Machined with laminate trimmer (small router)
knoba - tool throat LED

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All cleaned up. Lens (top), body (left) & module (right).
knoba - tool throat LED

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Very slim profile, very bright.
knoba - tool throat LED

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knoba - tool throat LED

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What’s in the CAD file…
knoba - tool throat LED

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Materials:
1 x 75x50x10 mm (3"x2"x3/8") polycarbonate sheet
1 x 75x50x3 mm (3"x2"x1/8") polycarbonate sheet
4 x M3x20 mm (1/8"x3/4") pan head machine screws
2 x lengths 7/0.2mm insulted wire (to suit connection distance)
1 x length heat shrink (to suit connection distance)
1 x small cable tie

nb. plastic sheet was recycled from computer monitor diffusers

Note: 1Amp in line fuse on live side. Use dpdt if switched.

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knoba - tool throat LED

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knoba – Tool throat LED – 2018.dxf

Ebay – Smart IC Driver 20W LED COB 220V

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Coil winder stick

Made from mahogany, for loading with magnet wire, 500mm long
knoba - coil winder stick

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A 2a variac core in for rewinding
knoba - coil winder stick

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Materials:
1 x 524x25x6 mm (20 5/8"x1"x1/4") hardwood
note: use (feet, 1/2 yard) if imperial measurements preferred!

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Spool winder unwinder

Takes many sized spools
knoba - spool winder unwinder

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knoba - spool winder unwinder

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knoba - spool winder unwinder

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Wire holder & hex key holder
knoba - spool winder unwinder

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Adjustable friction clutch
knoba - spool winder unwinder

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What’s in the CAD file…
knoba - spool winder unwinder

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Materials:
1 x 142x100x6 mm (5 5/8"x4"x1/4") plate/sheet mild steel
2 x 50x80x3 mm (2"x3 1/8"x1/8") plate/sheet mild steel
4 x m5x12 mm (3/16"x1/2") socket head bzp machine screws
4 x 12mm (1/2") o/d rubber stick on feet
2 x 25x30 mm (1"x1 1/4") nylon 6-6
3 x M6 (1/4") stainless steel penny washers
1 x M6 (1/4") felt, penny washer size
1 x M6 (1/4") conical spring
1 x M6 (1/4") thumb wheel
2 x M4 (3/16") grub screws
1 x M6 (1/4") circlip, or e-clip, or any other axial load shaft retainer
1 x 250x6 mm (10"x1/4") stainless steel bar
Some paint
& a handle (wood, metal, I used beads for jewellery)

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knoba – spool winder unwinder – 2018.dxf

knoba – thunb wheel jig

Rapid electronics – stick on rubber feet

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Via punches

Machined punches for brass through hole rivets
knoba - via punches

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Copper tracks had lifted, component had disintegrated, good repair, will use again!
knoba - via punches

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Refined the punches with; a taper, size i.d. & thumb nook
knoba - via punches

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knoba - via punches

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Materials (per unit):
1 x 75x6 mm (3"x1/4") circular solid section stainless steel


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Usb magnifier

Great bit of kit, bought from Ebay, but plastic lens was very poor.
knoba - usb magnifier

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Lens taken from broken camera, ground diameter with diamond disk.
knoba - usb magnifier

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Maplin drill converted cable entry to 2.5dc connector.
knoba - usb magnifier

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Optic holding flange (white plastic); increased the depth to suit new lens with diamond disk.
knoba - usb magnifier

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My “goto” tool for component markings.
knoba - usb magnifier

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knoba - usb magnifier

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Solder fume extractor mk3

Xmas present for a jeweller, it does need a new front grill making…
knoba - solder fume extractor mk3

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120mm computer fan – 12vdc – Noise 40dB @ 60cm – Power 1.8w
knoba - solder fume extractor mk3

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5.5 X 2.1mm dc connector, 240vac psu. Fan can be bench or shelf mounted.
knoba - solder fume extractor mk3

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knoba – Solder Fume Extractor Mk1

knoba – Solder Fume Extractor Mk2

duckduckgo.com – carbon cooker hood cut to size

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Tgp110 pulse generator fix

2nd hand purchase…
knoba - sunglass modding

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7905 negative voltage regulator, kaput, easy fix.
knoba - sunglass modding

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knoba – Thurlby Thandar Tgp110 Pulse Generator Service Manual – 2017.pdf

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Rlc switches

Resistor, Capacitor & Inductor selector switches
knoba - Rlc switches

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1p12t rotary switches, dupont clone connectors for breadboarding
knoba - Rlc switches

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Link to cad file below
knoba - Rlc switches

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knoba – Rlc switches – Facia – 2017.dxf

knoba – Electronics workbench

knoba – Breadboard Patch-leads & Peripherals

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Breadboard Patch-leads & Peripherals

2.54mm 1/10″ male to various connectors
knoba - Breadboard Patch-leads & Peripherals

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knoba - Breadboard Patch-leads & Peripherals

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2.54mm 1/10″ male to various peripherals
knoba - Breadboard Patch-leads & Peripherals

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knoba - Breadboard Patch-leads & Peripherals

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knoba - Breadboard Patch-leads & Peripherals

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Dupont clones
knoba - Breadboard Patch-leads & Peripherals

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knoba - Breadboard Patch-leads & Peripherals

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Amphenol – Interconnects

Molex – Interconnects

JST – Interconnects

Freecycle – Interconnect recycling

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Ac Power Supply

Aluminium frame pattern for recycled multitap transformer
knoba - Ac Power Supply

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Transformer core shaping buck
knoba - Ac Power Supply

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Frame made
knoba - Ac Power Supply

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knoba - Ac Power Supply

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Donor psu…
knoba - Ac Power Supply

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Ac system internals in
knoba - Ac Power Supply

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240vac @ 50Hz in: 1, 3, 6, 9 & 12vac @ 50Hz out
knoba - Ac Power Supply

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Illuminated the meter.
knoba - Ac Power Supply

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New laminated fascia (cad file below)
knoba - Ac Power Supply

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New laminated meter scale (cad file below)
knoba - Ac Power Supply

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Schematics (Fritzing file below)
knoba - Ac Power Supply

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knoba – Ac Power Supply – Fascia – 2016.dxf

knoba – Ac Power Supply – Meter Scale – 2016.dxf

knoba – Ac Power Supply – Schematic – 2016.fzz

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Test lead rack

Copper, brass, stainless, aluminium. It rotates.
knoba - Test Lead Rack

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Aluminium top tray & forming buck
knoba - Test Lead Rack

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Buck formed. Aluminium top tray formed
knoba - Test Lead Rack

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Brass upper rack and shaping forms
knoba - Test Lead Rack

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Complete assembly
knoba - Test Lead Rack

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Machined & beaten copper bolt, tray, turned copper spacer
knoba - Test Lead Rack

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Drive screws, machined & shaped brass rack piece
knoba - Test Lead Rack

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Machined aluminium wheel, copper spiky things, brass & stainless tynes, copper nut, m6 grub screw
knoba - Test Lead Rack

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Copper spiky things
knoba - Test Lead Rack

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Assembled
knoba - Test Lead Rack

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Upside down
knoba - Test Lead Rack

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Fitted to my electronics bench
knoba - Test Lead Rack

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Sumptuously disposed with test leads
knoba - Test Lead Rack

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Tray carrying nik-naks & bits
knoba - Test Lead Rack

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Cad file below
knoba - Test Lead Rack

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knoba – Test Lead Rack – 2016.dxf

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Component tester

Aka: Octopus, Curve Tracer, Analog Signature Analyser…
knoba - Component tester

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Made from recycled 240Vac “wall wart”.
knoba - Component tester

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Breadboarding the I/V circuit.
knoba - Component tester

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Breadboarding the internal 1A fuse and led indicator circuit
knoba - Component tester

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240V:10v transformer source and internals.
knoba - Component tester

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Measuring out internals and laying out facia
knoba - Component tester

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Making fuse & indicator pcb
knoba - Component tester

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Backside
knoba - Component tester

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All pcbs made and fitted
knoba - Component tester

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Made some test leads, facia done with inkjet printer and laminated
knoba - Component tester

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Compact, no mains leads hanging around…
knoba - Component tester

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BNC’s are 50ohm, 4mm bananas, female pin header.
knoba - Component tester

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Working well… seen testing an LED
knoba - Component tester

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knoba – component tester front panel – 2016.dxf
knoba - Component tester

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knoba – component tester schematic – 2016.fzz
knoba - Component tester

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knoba – component tester front panel – 2016.dxf

knoba – component tester schematic – 2016.fzz

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Resistor quick-pick labels

Ivy labels, marked on both sides, straight off bandoleers
knoba - Resistor quick-pick labels - 01

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Zip-loc bag keeps them all together, allows easy usage
knoba - Resistor quick-pick labels - 02

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Labels brown/burn/smell when res’ers dissipation maxed.
knoba - Resistor quick-pick labels - 03

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Much easier to locate & use, etc.
knoba - Resistor quick-pick labels - 04

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Electric Guitar

20 year old incomplete project, found on freecycle.
knoba - electric guitar - 01

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It finally has a voice and a lovely, unique, sound range.
knoba - electric guitar - 02

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Fodic neck.
knoba - electric guitar - 03

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I’ve done a lot to this guitar to get it up; hand beaten stainless steel jack port…
knoba - electric guitar - 04

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Custom electrics; 3 x dpdt phase reversal switches, hi & lo tone controls.
knoba - electric guitar - 05

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Non-magmetic 3 series stainless steel, all inlayed.
knoba - electric guitar - 06

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New house guitar. Have some wood inlay to do & more wood carving.
knoba - electric guitar - 07

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A first for me. Wood inlays (white oak)
knoba - electric guitar

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Switches are 3 position DPDT (down = out of phase, centre = off, up = on)
knoba - electric guitar

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304 stainless made from sheet
knoba - electric guitar

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Body is dark red meranti.
knoba - electric guitar

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Depth spotted with drill and chiselled flat, hide glued.
knoba - electric guitar

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Closing trim
knoba - electric guitar

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knoba - electric guitar

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EMG – musical instrument pickups

knoba – Electric Guitar – 2017.dxf

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Arduino battery power supply

Simple power supply for stand-alone arduino.

Would have liked to make a battery enclosure that took 2 stacked batteries.
knoba - arduino battery power supply - 01

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Strip-board pcb.
knoba - arduino battery power supply - 02

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Male usb mini b connector raided from cable.
knoba - arduino battery power supply - 03

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knoba – arduino battery power supply – 2016.dxf (CAD file link below)
knoba - arduino battery power supply

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Arduino – open-source electronics platform

Wiki – Open source

Energizer – Batteries

Digikey – Prototype Boards Perforated

knoba – arduino battery power supply – 2016.dxf

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Regulated BENCH POWER SUPPLY 240Vac ~ 24Vdc

knoba - Regulated 240Vac ~ 24Vdc Bench power supply

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Made from an ATX computer power supply.
knoba - Regulated 240Vac ~ 24Vdc Bench power supply

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knoba - Regulated 240Vac ~ 24Vdc Bench power supply

Outputs; 24Vdc, 12Vdc, 5Vdc, 3.3Vdc & USB 5Vdc (no data lines).

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Similar item used in power supply…
knoba - Regulated 240Vac ~ 24Vdc Bench power supply

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Upgraded: Laminated colour fascia
knoba - Regulated 240Vac ~ 24Vdc Bench power supply

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knoba – Regulated 240vac 24vdc bench power supply fascia – 2016.dxf (link below)
knoba - Regulated 240Vac ~ 24Vdc Bench power supply

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Rapid Electronics – Electronic Components

3M – SC-DR Roloc Surface Conditioning Disc

Ebay – 2 Port USB 2.0 PC Header

helpwithpcs.com – ATX Power Supply Pinouts

knoba – Bench power supply 240Vac ~ 35Vdc @ 1A

knoba – Regulated 240vac 24vdc bench power supply fascia – 2016.dxf

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Capacitor Code Cheatsheet

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knoba – Capacitor Code Cheatsheet – 2014.pdf

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Screwdriver Rack

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Screwdriver Rack

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Screwdriver Rack

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Screwdriver Rack

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Screwdriver Rack

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Screwdriver Rack

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Screwdriver Rack

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Screwdriver Rack

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Screwdriver Rack

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knoba – Screwdriver Rack – 2014.dxf (link below)

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Perspex – Fluorescent Cast Acrylic Neptune Blue 7T97

knoba – Screwdriver Rack – 2014.dxf

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Solder Fume Extractor Mk2

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Alcotec – Aluminum Filler Alloy Selection Chart.pdf

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Plier Rack for electronics bench

Plier Rack

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Plier Rack

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Plier Rack

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Plier Rack

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Plier Rack

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Plier Rack

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Plier Rack

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Plier Rack

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Upgraded: 25mm x 2mm self adhesive foam strips for tweezer base
Plier Rack

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Plier Rack

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knoba – Plier Rack – 2014.dxf (link below)

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Perspex – Fluorescent Cast Acrylic Neptune Blue 7T97

knoba – Plier Rack – 2014.dxf

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Solder Assist

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Solder Assist

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Solder Assist

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Ebay – Solder assist <£+p&p

Metal Mania – Bright steel hexagon freecutting EN1A bar 5/16 A/F x 1000mm

Wiki – Steel grades

Hardinge UK – Lathes

3M – Convolute Deburring Wheels

Rapid – RVFM 2:1 Heat Shrinkable Sleeving

West Yorkshire Steel – 3mm Silver Steel Bar

knoba – Sealey SM5 Metal Bandsaw Mods

knoba – Bench Grinder Station

•••

Linux & Microchips Low pin count demo board

Microchip Low Pin Count Demo Board Tutorial series.

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Toolchain…

Programmer: Pickit 2
Processor: PIC16F690-I/P
Build environment: Gnu/Linux Debian Jessie 3.2.0-4-686
IDE: MplabX 1.95
Make: GNU Make 3.81
Assembler: MpasmWin 5.53
Linker: Mplink 4.51

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Linux & Microchip Micro-controllers