Contents of the Norcim club website…..


Remember   for future reading. Thanks!


SOME USEFUL LINKS…                RCM+E



A non-Commercial website for interest only.

An ad-free website.

Website constructed using MS Office Word.

Site Domain issued by NZ.

Hosting by UK.

Uploading to web by

Website visitor feedback by

Photo and Diagram editing by

Security by 


Many thanks to contributors that have helped along the way.




Radio Control History and Electronics.



The Home Page (Page 1)


1.   History of the beginnings of the norcim website related to the founders of Micron Radio Control in the UK 1970s.

2.   Visit map showing recent visitors to the Norcim website….care of

3.   Links to other pages of the Norcim website.

4.   Fault finding notes regarding Micron receiver kits of the seventies to nineties.

5.   Micron transmitter history and fault finding notes.

6.   Micron dual conversion receiver technical notes including circuit diagram and method of working.

7.   Vacuum de-soldering tool improvement details.

8.   An R/C transmitter output tester circuit for use at up to ten metres distance.


Norcim page 2


1.   Using the Micron FET receiver on the 40MHz band. Simple component value changes suggested.

2.   DCMicron transmitter details on 40MHz and the use of Futaba crystals.

3.   A word or two about Micron transmitter output strength and how it can be measured.

4.   Compatibility of Micron transmitter transmit sections with their various plug-in coder sections.

5.   Early integrated circuit servo amplifiers using the World Engines WE3141 IC. Use of pot lube to prevent servo twitching.

6.   Looking after your transmitter telescopic aerial. A necessary maintenance using 27, 35, 40, and 72MHz transmitters.

7.   Circuit of an ‘on board’ glow plug energizer to allow heating of a four stroke plug at low revs. Better tick-over.

8.   Simple on-board circuit to detect the charge state of receiver batteries.

9.   A circuit to power 2volt glow plugs from a 12 volt battery for engine starting.

10. Alan Pratt talks about his PIC based encoder conversion of a Micron transmitter.


Norcim page 3


1.   A 35MHz and 40MHz radio control transmitter circuit.

2.   Electric powered V tail glider designed by the late Barrie Allen.

3.   R/C receiver servicing tip from George Beeler (NASA research labs).

4.   A historic experiment to determine the effect of engine vibration on a radio control receiver.

5.   Words from Malcolm Perry about using the 459MHz Radio Control band.

6.   Joystick wiring circuit used by many radio control transmitters.

7.   A servo fail-safe details by Allen Pratt.

8.   Mohamed Shiraz Kaleel talks about D.I.Y construction of brushless motors.

9.   A tribute to the RCC Radio Control Council of the UK. Also detail of UK. EU. And world radio control frequencies.


Norcim page 4


1.   Economy Electric Flight. Detail of simple speed controller and inexpensive 540 size electric motor.

2.   Simple servo tester circuit costing less that one UK£.

3.   35M FSMThoughts on Fast Charging of Nickel Cadmium and Nickel Hydride battery packs. Basic circuit for -∆V cut off.

4.   Circuit for checking 27, 35, 40 and 72MHz Transmitter output at 10 metres distance.

5.   circuit for checking 2.4 Gig transmitters from Dave1993 at

6.   Possible constant current circuits for charging Nickel Cadmium and Nickel-Metal Hydride battery packs.

7.   Simple relay switch circuit for electric flight brushed motors.

8.   Lost model alarm circuit using an LM555 timer IC.

9.   Historic details of early Galloping Ghost systems. Gallatrol transmitter details. Early joystick mechanics. Receiver pictures. Model type. DIY actuator details using the popular Mighty Midget geared electric motor of the 1950s.

10. Pulse proportional rudder systems (history) with suggestion of modifications to reduce actuator (servo) current.

11. A circuit suggestion from David Caudrey for a fast rudder only pulser or a rudder/elevator for ‘Smoothed’ Galloping Ghost.

12. History of the first Analogue Feedback servos.

13. Suggested circuits that may have helped Analogue servos.

14. Automatic taper charge circuit for 2 volt glow plug batteries. (Lead Acid sealed type).

15. Caravan security awning light. OK an odd input for the site but some modellers do have a caravan. My excuse anyway!

16. A transmitter circuit from Randal Munroe. (Randal’s circuit components will need much use of Google).


Norcim page 5


1.   Radio Receiver Testing (Now historic) by the late R/C Guru, Dave McQue of Bletchley Park UK and UK Radio Control Council.


Norcim page 6


1.   DC RX decode deckBrief History of model control systems.

2.   The Doug Spreng and Don Mathes digital control system.

3.   A seven channel digital transmitter encoder circuit for radio control using easy to get parts.

4.   Plug-in channel mixer circuit module for V tail and Delta model aircraft. Possible use with twin electric motor model boats.

5.   Digital receiver encoder circuit using easy to get parts.

6.   Another simpler digital transmitter encoder from Harry Lial.

7.   A digital receiver decoding circuit from Harry. Easy to get DIY parts.

8.   Comments on Airborne Radio Control Equipment from the late Dave McQue. RCC Radio Control Council.

9.   Thoughts on Single and Dual Conversion radio control receivers.

10. Further thoughts regarding Single Conversion R/C receivers.


Norcim page 7 (This page tends to cover commercial news and products)


1.   News from Micron Radio Control a small UK based R/C company that began life 1969.

2.   Kymodel’s Lobmaster radio control Fishing Boat Review. A ready to go package complete with all radio control components.

3.   The Art-Tech ‘Wing Dragon’ ARTF flying model, complete with R/C equipment……Review.

4.   Flight Simulator from Art-Tech Review.

5.   Inexpensive precision engineered micro servos review.

6.   RFCandy….a superb electronics component supplier using minimum postage charges.

7.   Just Engines…UK supplier of model engines and accessories.

8.   Aerial Photography?…you need to go to this site First.

9.   Review of the RadioLink 2.4Gig transmitter and receiver for radio control models.


Norcim page 8


1.   Pictures from the Long Marston Airshow 2012. (Stratford upon Avon).

2.   Mike Hawkins Retro Valve Radio Control equipment. With link to early valve circuitry.

3.   ESC Halved Data Rate Layout2David Caudrey with his early 27 MHz valve transmitter memories.

4.   An early model aircraft using a two valve receiver.

5.   The Hill Two Valve receiver details.


Norcim page 9


1.   Introduction of David Caudrey. Fellow writer of the Norcim website. Includes background history of UK radio control systems.

2.   Skyleader transmit section circuit.

3.   Skyleader coder circuit using Signetics NE5044.

4.   Skyleader Transmitter Nicad arrangement.

5.   Skyleader mains charger circuit.

6.   Skyleader servo circuit using the Mitsubushi MC51660L chip.

7.   Gallatrol102J.R. 35MHz transmitter section circuit.

8.   Micron 35MHz Competition receiver circuit.

9.   Fleet 35MHz transmitter section circuit.

10. Fleet XP NE5044 encoder circuit (basic).

11. Fleet XP joystick input circuits.

12. Fleet XP ancillary controls circuit.

13. Futaba AM 27MHz transmitter circuit.

14. Fleet motor switch circuit.


Norcim page 9 part two.


1.   In-Line Rx to Servo circuit. (produces 5volts). Original Design by DC.

2.   In line converter circuit for speed controllers to work with the Futaba FASST 2.4Gigahertz system. Original Design by DC.

3.   Digifleet XP-FM standard receiver 7 channel.

4.   Eaglet2 001digifleet XP-FM mini receiver 4 channel.

5.   Fleet servo circuit and PCB layout.

6.   Futaba 4 Chan FM ‘Attack’ transmitter coder circuit.

7.   Futaba 4 Chan FM ‘Attack’ transmitter RF transmit section.

8.   Mystery 27MHz AM transmitter circuit.

9.   Gallatrol Galloping Ghost transmitter circuit.

10. Interesting Valve signal generator circuit.

11. Proxxon mini circular saw drive circuit.

12. Micron speed control circuit.

13. Receiver battery monitor circuit.

14. A -∆V (peak detect) charger for Nicad and NMHydride batteries.


Norcim page 10


1.   A timed constant voltage battery charger circuit.

2.   Simple LIPO battery charger circuit.

3.   A Zero Volts Drop Diode circuit.

4.   Delta- Peak charger for 6 to 8 Nicad or NiMH cells2Testing Rig for brushed and brushless electric flight motors.

5.   Optical Sensor circuit for RPM.

6.   Frequency to Voltage conversion circuit.

7.   Voltage to Current conversion circuit.

8.   Gating circuit for Digital Tachometer.

9.   50 Amp Shunt construction details.

10. Solar Garden Lamp circuit (for interest).

11. MacGregor transmitter coder circuit.

12. MacGregor transmit circuitry. (RF section)

13. MacGregor M23 six channel receiver notes plus circuit.

14. Another Mystery single channel Tone transmitter circuit circa 1960.


Norcim page 11


1.   Delta Peak Charger circuit for NICAD and NIMH batteries.

2.   Charger circuit for 2 or 3 Cell LiPo batteries.

3.   A six cell commercial NC/NH charger circuit.

4.   On-Board Receiver battery monitor.

5.   Micron Mini Receiver circuit.

6.   Micron speed controller circuit.

7.   Servo tester and speed controller tester circuit.

8.   Movement detector circuit. Possible speed gun for models.

9.   Nicad re-cycling circuit. Reduce memory effect of batteries.

10. micron TxA 50MHz frequency meter circuit.


Norcim page 12


1.   Excellent Hobby Coverage from R/C Universe with video content.


Norcim page 13


1.   OPERATIONAL AMPLIFIERS. Their use and applications.

2.   Fleet R/C systems servo reverse and throw circuitry.

3.   A simple servo throw and reverse circuit.

4.   An AC millivolt meter circuit.

5.   Frequency to phase converter circuit.

6.   Rate of change circuit.  -∆V Charger use ?.

7.   The Wien Bridge circuit history and operation.

8.   Voltage to current conversion circuit.

IMG_28629.   Experimental charge circuit based on 8 above.

10.              The non-inverting Integrator circuit.


Norcim page 14


1.   A discussion about tuned circuits used in radio Control.

2.   The Pi-network Filter matching circuit in mathematical detail.


Norcim page 15


DAVID CAUDREY’s  in depth look at discrete transistor amplifiers, both Bipolar and Field Effect (JFET) types are covered In great detail.



Norcim page 16 (fragmented notes from the Norcim website)


1.   Peter Allen with a wonderful group picture from Tasmania.

2.   Micron AM 27MHz receiver circuit.

3.   Layout of Micron’s PCB receiver.

4.   DC in thinking mode of the Micron Dual conversion receiver.

5.   David Coles info re the Dorfler receiver.

6.   David Caudrey’s reverse engineered Dorfler receiver circuit.

7.   A historic electrified Kiel Kraft Ladybird.

8.   39… British model engine manufacturers that have bitten the dust!

9.   Notes re the RCM+E Eaglet being electrified.

10. D.I.Y. Anodising of engine parts. Great detail by David Coudrey.

11. Peter Gascoin’s conversion notes of a vintage JR radio to 2.4MHz.


35M FSM closeNorcim page 17


1.   Super Regenerative Receivers History. (A David Caudrey Discussion).

2.   Technical details and working concept.

3.   Early Valve circuits.

4.   Gas filled valve circuit.

5.   Transistor super regen circuits.

6.   RCM+E magazine version.

7.   The early ‘IVY’ valve carrier wave receiver details.

8.   The Hill Two Valve receiver circuit and photo.


Norcim page 18    AM versa FM on early 27MHz and 35MHz radio control systems


1.   Comments about dual pulse proportional systems (after Galloping Ghost).

2.   JR Module3Notes about how ‘FM’ frequency modulation is done in Transmitters.

3.   Why are there no ‘Home Brewed’ radio control systems now ?

4.   R/C Magazine advertising of yesteryear.

5.   Servo kits and DIY.

6.   Email from Peter covering his 2.4MHz conversion of a JR transmitter and receiver.

7.   A modified West Wings Toucan model.

8.   Typical saga of ‘black wire corrosion’ .

9.   Is 2.4 Gigahertz R/C all it’s cracked up to be ? …..a discussion from Barry Lennox.

10. 2.4 Gig problem from Michael.

11. Typical powerful commercial 2.4 Gig transmitters.

12. Mercury Bipe just built from 70 year old kit. By David C.

13. Own design electric glider by David C.

14. Inside the model Rx aerials for 27,35, 72 MHz Barry Lennox.

15. plug-in crystals operation and notes.


Norcim page 19


1.   Another Mystery 35MH Transmitter circuit !

2.   David Caudrey’s Retro Receiver Project. An attempt to re-create a very early valve receiver but with an interesting twist for power image062supply !

3.   RCS Mk11 Guidance System Receiver plus schematics.

4.   RCS Mk11 Guidance System Transmitter notes and schematic.

5.   Notes and findings of the above early radio control system.

6.   Some early Valve Receiver circuits used by manufacturers.

7.   A Retro-Receiver project by David Caudrey with improvements that could have been used at the time.

8.   Ongoing notes and findings of the above project as it developed.


Norcim Page 20


1.   Georges Berry looks back to the ‘Single Stick’ flying days and could we get back to R/C transmitter controls offering the nearest thing to full size flying.

2.   Problems with single stick transmitter layout.

3.   Possible solution to the above.

4.   Back to the joystick saga with thoughts of an ‘electronic’ joystick with no moving parts !

5.   Electrifying Puppeteer ! A project of replacing a 40 size glow motor with similar power brushless motor.

6.   A Newcomers Guide about the 2.4 Gigahertz Radio Control Band

7.   Some interesting facts about our well used model control frequencies

8.   Spread- Spectrum radio control systems by Guru Barry Lennox. The surprising history of 2.4Gig radio and its future is discussed. 


Norcim Page 21


1.   John Whitehead’s Retro radio control project. A taste of yesteryear.

2.   Some R/C model background of John Whitehead.

3.   Thoughts about a DIY transmitter using the 35MH R/C waveband.

4.   A novel method of circuit board production using an Epson SX210 ink jet printer.

5.   DIY tips for etching a printed circuit board.

6.   Using Overhead Projector film for PCB production.

7.   Finished and assembled printed circuit boards for the Retro transmitter.

8.   John’s simple four channel PPM coder for the Retro transmitter with servo reverse.

9.   Update section for the ongoing project above.

10. Emerging details of the exciting nordaveVTU. Device for altitude assist in model aircraft. Dave Caudrey’s latest invention (with a twist!).

11. Electric revamp of Vic Smeed’s ‘Tomboy by David Caudrey


Norcim Page 22


1.   A 2.4 Gigahertz transmitter output detector. (Wave Checker Device). By David Caudrey.

2.   A micro ammeter project. (Capable of measuring tiny current flow). By David Caudrey.

3.   A blast from the past…former Micron customer updates vintage R/C transmitters with leading edge technology. By Paul Luby.

4.   An analogue servo design that equals the performance of the normal ‘digital’ versions. By Jean-Marie Piednoir.

5.   Superb Retro Galloping Ghost model using up to date actuator and electronics. By Jean-Marie Piednoir.


Norcim Page 23


1.   Increase the range of your transmitter with an aftermarket high gain antenna ? Robert Coggan discusses the implications.

2.   Converting a scale Mustang slope R/C model to electric flight. David Caudrey’s latest project.


Norcim Page 24


1.   The Flame Wheel F550 hexacopter from Brian Boyde. (includes the Aldi Toy equivalent).


Norcim Page 25


2.   Further DIY anodizing notes from David Caudrey.

3.   Also Superman 2. You will be astounded at the picture! Thanks to Rob Green.

4.   Indoor flying infra-red transmitter details from Georg Bohmeke.

5.   Powered glider design. Georg Bohmeke.

6.   Early proportional radio control by Helmut Brus. A magical Era.


Norcim Page 26


1.   Using the Maplin microwave detector for a 2.4 transmitter check.

2.   Details of David Caudrey’s home-made air compressor for airbrush use.


4.   Rob continues with some construction detail of his Model of the 1909 Monoplane ‘DEMOISELLE’. Amazing detail.



Norcim Page 27


1.   Returning back to the Maplin Microwave Leakage detector for R/C transmitter testing (page 26).

2.   David Caudrey’s amplified 2.4GHz transmitter detector shows extreme sensitivity and range. Clever and frightening if the microwave oven is working in the kitchen!

3.  Thomas Budka’s RF harvesting device shows just how effective the RF102A can be compared with the best microwave diodes available.

4.   Radio Control servo technology has evolved and improved since the Spreng and Mathes PPM invention in the late 1950’s. however servos of today still rely on the same old ‘Pulse Width’ variation. Shows how good the idea was. A DIY PPM Servo Tester is shown that works not only old servos but most present day servos sold with 2.4GHz equipment.


Norcim Page 28


1.   A look back to model aircraft in the beginnings of the hobby. The great pioneers. The balsa wood construction and paper tissue covering, also stuff called Dope. Early valve radio and transistor developments.

2.   RC provide an amazing collection of early radio control equipment images dating back to when our hobby began.

3.   If you have a picture of your early modelling days, or even Retro stuff, then please share it with us oldies (or newbies!) for memories. Thanks!


Norcim Page 29


1.     David Caudrey looks back to the beginnings of our Radio Control hobby and vacuum tube receivers.



Norcim Page 30


1.   First impressions flying the MjX Bugs 2 drone. GPS return to home and altitude hold. High range.


Norcim Page 31


1.    Memories of a lifetime in aeromodelling by Chris.  (Part 1).



                                Norcim Page 32


2.    Memories of a lifetime in aeromodelling by Chris.   (Part 2).



Norcim Page 33


1.   DRONE AND MODEL AIRCRAFT REGULATIONS 2020. David Caudrey looks at designing a slope sourer model that could come in at less than 250 grams flying weight. Also suitable for flat field use.


Norcim Page 34


1. BACK TO THE FUTURE with a look at the advantages of Single Triple Axis Joystick transmitter control for model aircraft, helicopters, drones, cars, boats, robots. A long ignored system with great ergonomic hand control advantages.


Norcim Page 35


A look back at the Veron Police Launch model boat. A reminiscing project by David Caudrey to provide a reversing capability from a simple two channel radio control system.


Norcim Page 36


Jean-Marie Piednoir’s look at the vintage UK Staveley multichannel analogue Radio control system with very detailed electronic circuits 


Norcim Page 37


David Caudrey is presented with a box of vintage radio valves from an old friend and revisits the Two valve Hill receiver.  A milestone in Radio Control History.


Norcim Page 38


A page of looking back at Model Radio Control of our lifetime. The 35 NHx band revisited. A 27 MHz FM radio control system. Input and much feedback from Bob Everitt. More reverse engineering from David Caudrey. Input from Mike Hausner on 250 grams model flying with designs.


Norcim Page 39


A David Caudrey project ... Looking at a possible 459 MHz Valve super-regenerative model aircraft radio control receiver. Initial Progress.


Norcim Page 40


Details of a vintage transmitter still in use today by Michael Robbins.

An early dual proportional analogue receiver circuit from Michael Robbins.

David Caudrey returns to LED household bulbs (lamps) with a reverse engineered circuit.

Adrian Hiley comments on the Skyleader transmitter coder circuit shown on page 9 of this website.


Norcim Page 41


A Memory page covering Micron Radio Control’s contribution to the model flying hobby nearly 50 years ago.


Norcim Page 42


Spread-Spectrum RC Systems, How they started and how we got there. By Barry Lennox NZ.




Documents of interest:-


Vintage Model Control Valve Circuits        from Mike Hawkins.


Timer circuit for free flight electric models      DC & TT norcim.






David Caudrey’s Nucleonics website is only a click away !    Now with more diversified content.


About norcimguy  (Webmaster) the chap who puts the pages together.






    Most websites now use ‘Cookies’ to assess visitor numbers and page popularity……… 



  Privacy Policy for


At the privacy of our visitors is of extreme importance to us. This privacy policy document outlines the types of personal information is received and collected by and how it is used.


Log Files…

Like many other Web sites, makes use of log files. The information inside the log files includes internet protocol ( IP ) addresses, type of browser, Internet Service Provider

 ( ISP), date/time stamp, referring/exit pages, and number of clicks to analyze trends, administer the site, track user’s movement around the site, and gather demographic information. IP addresses, and other such information are not linked to any information that is personally identifiable





The above information is collected for by STATCOUNTER.COM















hit counter