Dr. Holden’s PHACO FLUIDICS BOOK moved from previous website WORLDMICROPHACO.COM

THE CROMEMCO DAZZLER REBORN

THE CONSTANT VOLTAGE MACHINE

THE AMAZING SANYO 8P2 TELEVISION FROM 1962

DIAGNOSTIC TOOL FOR THE SOL-20 KEYBOARD

RE-CAPPING THE ZC1-MK2

RESTORATION OF THE SONY MICRO TV 5-303E

THE SOL WITH THREE BRAINS

REPLACEMENT DC POWER PLUG FOR THE ZC-1 RADIO

SOUPING UP THE ZC-1 AUDIO OUTPUT STAGE

RESTORATION OF THE NATIONAL 1-10A RADIO

REPLICA MM5204 PERSONALITY MODULE FOR SOL-20 COMPUTER

THE TRF-ONE RADIO

POWER SUPPLY FOR NATIONAL 1-10A RADIO

THE SOL-20 COMPUTER S-100 LIGHT PEN PROJECT

5.25″ DUAL FLOPPY DISK DRIVES FOR A CP/M COMPUTER

THE WD-40 EXPERIMENTS

THE WORLD’S FIRST COMPUTER GRAPHICS CARDS-THE ALT256 and ALT-512

THE AMBER COMPUTER VDU PROJECT

REPAIRING THROUGH HOLE PCBS WITH MINIATURE EYELETS

SOL-20 COMPUTER POWER ON LOCKUP PROBLEM WITH THREE 16KRA RAM CARDS.

LOST IN SPACE. IBM-5155 ASYNC CARD REPAIR.

THE SOL-20 COMPUTER CASSETTE TAPE INTERFACE

VOTRAX TYPE ‘N TALK MEETS THE HERO Jr. ROBOT

HISTORICAL LUCAS ALTERNATOR REGULATOR AND IGNITION DESIGNS.

PROCESSOR TECHNOLOGY 16KRA BOARDS & DELAY LINES.

HERO Jr. RUNS AWAY

THE BARLOW WADLEY XCR-30 RADIO.

THE IBM-5155 POWER SUPPLY

AUTO DETECTING 405 LINE VIDEO MONITOR

THE ZENITH ROYAL 500 TRANSISTOR RADIO

THE H-FIELD TRANSANALYSER

ORAC: THE TRANSPARENT PAPER WEIGHT TV.

THE PAL FREEZE FRAME MACHINE

THE 1987 VINTAGE CONRAC AVIONICS VIDEO MONITOR

THE EDDYSTONE 640 RADIO AND A MEDIUM WAVE UP CONVERTER.

HICKOK TV-10 CALIBRATION AND A SEMICONDUCTOR CALIBRATION TOOL.

ELECTROLYTIC CAPACITOR FAILURE TEK TM POWER UNIT & SELF CRACKING RESISTORS TELEQUIPMENT SCOPE

THE ADMIRAL 19A11S TELEVISION SET AND THE CLEVEREST DEFLECTION CIRCUIT EVER CREATED.

THE 120V 400Hz THREE PHASE POWER SUPPLY FOR AVIONICS INSTRUMENT TESTING.

PRACTICAL TELEVISION’S ARGUS and “MY ARGUS”

RF MODULATORS FOR 405 LINE TELEVISION.

INCREASING THE UTILITY OF THE IBM5153 COLOR MONITOR TO DISPLAY 16 COLOR EGA IMAGES

USING AN IBM EGA CARD IN THE IBM 5155 COMPUTER AND RUNNING THE AMBER MONITOR

MINI ARCADE PONG “SIX BUGS SAFE”

GRETSCH GUITAR JET FIREBIRD & RALLY MODEL TREBLE BOOST AMPLIFIER MYSTERY.

THE UX-171-A CLASS AB1 PUSH PULL POWER AMPLIFIER

THE BUBBLES THAT CRIPPLED A KING

THE 1972 DIGEEC NIXIE CLOCK FROM EUROPEAN ELECTRONIC COUNTING (EEC).

THE UP-DOWN 12-24Hr CMOS CLOCK

THE GREBE SYNCHROPHASE MU-1 RADIO.

RADIO GRID LEAK DETECTORS IN THE 1920’s.

TEKTRONIX OSCILLOSCOPES: VERTICAL AMPLIFIER CALIBRATION PRINCIPLES & THE 464 OSCILLOSCOPE.

TEKTRONIX 2465B MAIN BOARD INTERTRACK LEAKAGE PROBLEM

GAS TURBINE ENGINES.AVIATION AND ROCKET MOTOR EXCITERS

TEKTRONIX 2465b A5 PCB REPAIR

THE NZ MADE PACEMAKER TRANSPORTABLE TRANSISTOR RADIO

THE 1962 TUNG SOL EI-4 THYRATRON BASED CAPACITANCE DISCHARGE IGNITION FROM MOTION INC.

THE SONY GENDIS TR-72 TRANSISTOR RADIO

THE AF178-OC16 RADIO

TEKTRONIX 2465B OSCILLOSCOPE. RE-POWERING THE DS1225 BBSRAM OR REPLACING WITH FRAM or AUTO- STORE nvRAM & GENERAL SCOPE CALIBRATION ISSUES.

ZC1 MK2 POWER SUPPLIES

HERO Jr POWER SUPPLY PROTECTION & HERO Jr RADIO SYSTEMS.

HISTORICAL ELECTRONIC DYNAMO REGULATOR DESIGNS:

THE EF98-OC16 RADIO

RESTORATION OF THE ANDREA KTE-5 AND THE MEISSNER 5 INCH 1939 TV SETS.

EVOLUTION OF THE ENERGY RECOVERY DIODE OR DAMPER DIODE.

A SELF EVIDENT SOLUTION TO THE RESISTOR CUBE QUESTION

RESTORATION OF THE RCA 621TS TELEVISION SET.

FITTING A 5FP4 CRT TO THE HMV904.

ATARI PONG THE MISSING CIRCUIT ANALYSIS-42 VECTORS & LAWN TENNIS.

A BUSH TV22 TELEVISION RESTORATION

WORLD’S ONLY ALL FETRON SUPERHET RADIO & THE OMEGA DEVICE

USING STANDARD PROBES WITH THE TEKTRONIX 222PS OSCILLOSCOPE & REPLACEMENT BATTERY SYSTEM.

INFANT BREATHING MONITORING – THE DYNAMIC CENTRE OF MASS INFANT BREATHING MONITOR.

RESTORATION OF A 1939 HMV904 TELEVISION SET.

THE RM-65 CRTC VIDEO BOARD

THE ORIGINAL C1-MINI LATHE MOTOR CONTROLLER

The Static Tic Tac Toe Computer

RESTORING THE EARLY COMMODORE PET VDU

DRAM MEMORY TEST SYSTEM FOR the 2001 DYNAMIC PET COMPUTER

THE TAYLOR-WILSON PET COMPUTER UNIVERSAL PRINTER INTERFACE

THE ASTOR DIAMOND DOT CAR RADIO RESTORATION

THE SPUTNIK STORY

THE HEATHKIT GW-21A TRANCEIVERS

The MC1468705G2 MCU Rom Data Extraction Project