501 AUDIO CLICK/PLOP SUPPRESSOR
502 BALANCING LIPO CELLS
503 BIDIRECTIONAL I2C LEVEL SHIFTER
504 BRACHION DETECTOR
505 BRIDGE-RECTIFIER LED INDICATOR
506 BUILD YOUR OWN ROTARY ENCODER
507 BUTTERFLY DIPOLE FOR DVB-T
508 CABLE TESTER
509 CARRIAGE DETECTION FOR MODEL RAILWAYS
510 CASCODE STAGE OR ‘COLLECTOR FOLLOWER’
511 CCO METAL DETECTOR
512 CHEAP DOT-MODE BARGRAPH DISPLAY
513 CODE LOCK WITH ONE BUTTON
514 COLOSSUS JR.
515 COMPACT 200 W OUTPUT STAGE
516 CONVERTER IC WITH INTEGRATED SCHOTTKY DIODE
517 CONVERTING A DCM MOTOR
518 CUK CONVERTER
519 CURRENT SENSING
520 DATA BIT DOUBLER FOR HT12E
521 DELPHI FOR ELECTRONIC ENGINEERS
522 DELPHI FOR ELECTRONIC ENGINEERS
523 DELPHI FOR ELECTRONIC ENGINEERS (3)
524 DELPHI FOR ELECTRONIC ENGINEERS (6)
525 DELPHI FOR ELECTRONICS ENGINEERS (4)
526 DELPHI FOR ELECTRONICS ENGINEERS (5)
527 DIGITAL VU METER
528 DIL / SOIC / TSSOP EXPERIMENTING BOARDS
529 DISCHARGE CIRCUIT
530 DRM DIRECT MIXER USING AN EF95/6AK5
531 DRM DOUBLE SUPERHET RECEIVER USING AN EF95/6AK5
532 DVI INTERFACE
533 EE-TERNAL BLINKER
534 EFFICIENT CURRENT SOURCE FOR HIGH-POWER LEDS
535 EL156 AUDIO POWER AMPLIFIER
536 ELECTROSMOG TESTER
537 ENERGY-SAVING SWITCH
538 ESR / C TESTER
539 EXTENDED TIMER RANGE FOR THE 555
540 EXTENSION FOR LIPO CHARGER
541 FILTER-BASED 50 HZ SINEWAVE GENERATOR
542 FLASH CODE LOCK FOR PCS
543 FORMERLY A TOBACCO TIN
544 FRIDGE THERMOSTAT
545 FROM A TO D VIA USB
546 FT369 ONE-CHIP SERVO CONTROLLER
547 GARAGE TIMER
548 GENTLE BATTERY REGULATOR
549 GLOW PLUG HEATER
550 GPS RECEIVER ON USB
551 HARD DRIVE SWITCH
552 HIGH VOLTAGE REGULATOR
553 HIGH-END POWER AMP
554 HITTING THE HIGH NOTES
555 IMPROVED DECT BATTERY CHARGER
556 INTELLIGENT CLAP SWITCH
557 LED BEDSIDE LAMP
558 LED FLASHER FOR 230 V
559 LONG-DELAY STOP SWITCH
560 LOW-COST LIPO CHARGER
561 LOW-COST PLUG-IN BOARD
562 LOW-COST STEP-DOWN CONVERTER
563 LOW-DROP REGULATOR WITH INDICATOR
564 LPC210X ‘ARMEE’ DEVELOPMENT SYSTEM (2)
565 MAGNETIC FLUX DENSITY METER
566 MEDIUM-WAVE MODULATOR
567 MICROPOWER VOLTAGE REGULATOR
568 MINIMALIST MICROCONTROLLER
569 MOBILE PHONE OPERATED LOCK
570 MP3 ADAPTER FOR TV
571 MSP430 PROGRAMMER
572 NAVIGATOR ASSISTANT
573 NEGATIVE-OUTPUT SWITCHING REGULATOR
574 NOISE SUPPRESSION FOR R/C RECEIVERS
575 OBD-2 ANALYSER
576 ON-DEMAND WC FAN
577 OPAMP TESTER
578 OPTICAL MIXER
579 PARALLEL-PORT FLASHER FOR FLASH MICRO BOARD
580 PASSIVE 9TH-ORDER ELLIPTICAL FILTER
581 PC IRDA PORT
582 PCI EXPRESS
583 PDM PULSE GENERATOR
584 PETINSPECT
585 PHANTOM SUPPLY FROM BATTERIES
586 PIC PWM CONTROLLER
587 PIC18FLASH DEVELOPMENT BOARD
588 PIXCAXE CONTROLS NOKIA 3310 DISPLAY
589 PLANT GROWTH CORRECTOR
590 PLAY SOLITAIRE
591 PLAYFUL LIGHTS
592 POT AS INTERRUPT GENERATOR
593 PRECISION BAROMETER/ALTIMETER
594 PRECISION HEADPHONE AMPLIFIER
595 PROGRAMMER FOR DCC MODEL RAILWAY CONTROL
596 PROTECTION FOR VOLTAGE REGULATORS
597 PROXIMITY SWITCH
598 RACETRACK TIMER
599 REFLECTION LIGHT BARRIER WITH DELAY
600 REMOTE CONTROL BLOCKER