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roel arits electronics hobby shack
Electronics
Projects
Where electronics meets art
African sun (glass mosaic work)
Celtic Dragon (glass mosaic)
Glitter ball (glass mosaic)
Light fan (Tiffany)
Magic colour changing mosaic lamp
MilkySway
Arduino
Arduino plays 8-bit 44KHz .wav files from SD card
Arduino plays tunes using digital output
Gravity LED balancer
Arduino RGB color stroboscope
Remote sensing with out of range indication
Dangerous jingle bells 30kV
Misc
Cat repeller
Long range IR beam break detector
Driving a 3-phase AC motor
Useless box improvement
Very stable magnetic levitator
Mazzilli (ZVS) oscillator improvement (start-help)
Wireless power transfer
Radio button circuit
Solid-state feet warmer
Audio cable tester
LED related topics
LED fading/dimming
Introduction to LED fading/dimming
Alternating analog LED fader
Analog LED fader using FET square law
Analog LED fader using synthetic inductor
Analog LED fader using Twin-T sine oscillator
Analog LED fader with LDR feedback
Mechanical LED fader
Versatile LED flasher
High voltage
Electronic gas lighter
High voltage pulse generator (>30KV)
Boost converter 100V/2.5mA to 500V/500uA
Articles
The transistor
Transistor basics
Transistor as a buffer
Transistor as a switch
Transistor as an amplifier
The OPAMP
OPAMP basics
OPAMPS made easy
OPAMP single supply behavior
OPAMP What's inside ?
OPAMP applications
PUT (Programmable Unijunction Transistor)
Introduction to the PUT
PUT LED blinker
PUT LED flasher V1
PUT LED flasher V2
PUT LED flasher V3
PUT linear LED fader
PUT relaxation oscillator
PUT sawtooth generator
PUT symmetrical square wave generator
PUT voltage controlled sawtooth generator
PUT as a DIAC (trigger diode)
PUT zero crossing detector
Current related topics
Constant current sources
Current mirrors
Current multiplier
Current reflector
Current comparator
Current sensing
Impedance converters
Gyrators (synthetic inductors)
NIC (Negative Impedance Converter)
Capacitance multiplier
H-bridges
Power and data over 2 wires
Where did i go wrong !?
Noise
Proper grounding
EMI and EMC
The road to CE compliance
roel arits electronics hobby shack
LED related topics
LED fading/dimming
Versatile LED flasher
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