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TITLE | DATE | DETAILS | ||||||
The Autoflex | Jun 1964 | Very interesting article explaining how automatic reflexing occurs in the Autoflex (Spontaflex). Circuits for 2, 3 & 4 transistor receivers MAT101 OC72 OA81 | ||||||
Silicon Spontaflex | May 1969 | Modifications to enable the original Autoflex to incorporate silicon transistors and improve performance 2N3707 2N2926 OA81 | ||||||
SuperAlphadyne | May 1976 | High Selectivity Receiver LW/MW down to 120 metres BF167 BC169C OA10 | ||||||
6S3T Short Wave Receiver |
Aug 1964 | 3 Transistor 6 Stage coverage 19 to 75 Metres MAT101 MAT121 OA81 | ||||||
6S3T Short Wave Receiver |
Dec 1978 | Modified for Silicon Transistors 2N3707 2N3663 BC169C OA81 | ||||||
Beginners Portable Receiver |
Jul 1967 | A simple MW/LW Circuit MAT101/121 OC81 GEX64(CV2310) | ||||||
DRC 2 | Jan 1968 | Spontaflex Shortwave 1.25 to 15 Mhz An idea of the ingenious reflex operation is given by the fact that the headphone output and the aerial input are connected to the same emitter MAT101/121 OA81 | ||||||
DRC 2 | Feb 1970 | Modified for silicon Transistors 2N3707 2N2926 | ||||||
The Hybrid All Wave Radio |
Aug 1978 | Continuous Coverage from 16 to 2000 metres ECH83 BFR99 BC169 OC22 IS44 | ||||||
DRC 3 | Jun 1972 | Very sensitive double reflex Colpitts SW Receiver. This receiver takes advantage of permeability tuning to provide an exceptionally high L/C ratio at all frequencies covered from 1.5 to 22Mhz. 2N3707 BF115 BC169C OA91 | ||||||
Comprehensive Volume Control |
Aug 1966 | Single Potentiometer controls RF Gain: Regeneration: AF Gain XA101 MAT101 AC127 OA81 | ||||||
Watersport Portable |
Feb 1980 | High Selectivity MW/LW Receiver Built in Wavetrap 2N2926 BC169C 2N3663 OA10 | ||||||
Singlespan Hybrid | Oct 1964 | Continuous Tuning without switching From 150 to 2100 Metres MAT101 EL41 OA81 | ||||||
SA 3 | Dec 1969 | High Q MW/LW Receiver. 100pf tunes the full MW band BF225 2N3707 BC168B OA73 | ||||||
SA 4 | May 1968 | Permeability Tuned Super Alpha Pair MAT101/121 OC200 BSY26/27 OA73 | ||||||
SA 5 | Jun 1971 | 5 Transistor .Super Alpha Tuner. Exceptional Selectivity and Sensitivity BFY51 BC168B BF115 OA5 (for OA5 use base/emitter junction of AC176 or similar) | ||||||
Hybridyne | Apr 1973 | MW Hybrid 3 transistors 1 Valve 2N4289 BC169C DL96 | ||||||
Band II Portable |
Mar 1979 | Very Sensitive VHF FM Receiver BC169C 2N3663 2N4289 2N3707 2N3405 OA81/91 IS44 BZY88C6V2 BZY88C3V0 | ||||||
The Stereosim | Jul 1971 | LW/MW Tuner & Stereo Amp Quasi-Stereo Effect on Mono BC168/169 AD162 OA91 DD000 | ||||||
Caravan Receiver | Apr 1966 | Sensitive MW/LW Hybrid Draws only 100mA from Car Battery 3Q5GT(DL33) MAT101/121 GECS5=ACY19/ACY21 | ||||||
Pentonlector Amplifier |
Jul 1966 | Simple & Neat Hybrid Amp Good Quality reproduction PL82 XC141 DD000 | ||||||
The Droitwich Car Radio |
Nov 1971 | Long Wave Car Radio. Preset to 200Khz. 3 Transistor 1 valve Hybrid 2N4289 BC169C AD161/AD162 ECH83 | ||||||
Triple-s | Nov 1968 | Simplicity and Sensitivity with 3 transistors 2N4058 2N2926 OA73 | ||||||
Singletran | Aug 1963 | A single transistor circuit which offers a loudspeaker output when a strong local signal is available GET114 or GET103 OA81 | ||||||
Multi-Tuner | Feb 1967 | Six functions and the only switch is the on/off button OC44 OA81 | ||||||
Bass-Boost Portable |
Apr 1972 | LW/MW 2 Transistor. Loudspeaker Output Positive feedback bass boost control BF115 BC169C OA73 | ||||||
Spontaflex DR4 | Mar 1966 | Seven Stage MW Receiver 3 or 4 Transistor Circuits MAT101 XA701 AC127 GET103 OA81 | ||||||
Sliding Challenger |
Aug 1970 | 250mW 3 Transistor Class A Amp Battery economy equal to Class B BC168C MC140 or BFY51 | ||||||
DRC Junior | Oct 1973 | Similar to DRC3. Easier to build. BC169C BF115 OA73 | ||||||
Miniflex Dual Purpose Receiver |
Jun 1968 | Miniature 3 transistor MW receiver.If desired an external speaker may be plugged in whereupon a larger battery is automatically connected and the output circuit is altered for optimum operation AF117 ACY21 M3=LED | ||||||
Miniflex MK II | Jul 1968 | 3 transistor MW/LW tuner ST141 AC127 M3=LED | ||||||
Miniflex MK III | Dec 1970 | 2 transistor MW/LW tuner BF115 M3=LED | ||||||
Miniflex MK VI | Oct 1971 | LW/MW 3 Transistor(1 FET) Loudspeaker output and only 3mA consumption 40468A BF115 M3=LED | ||||||
Transportable | Nov 1969 | MW/LW Hybrid 3 Transistors 2 Valves. Mains or Car Battery Powered 2N4058 BC168B OC22 OA202 DD000 EF97 | ||||||
Universal Car Radio |
Apr 1969 | 6 or 12 Volt supply. Positive or Negative Earth 2 Valve 4 Transistor Hybrid 2N4058 2N2926 OC19 OA81 GEX64(CV2310) EF97 | ||||||
Class A Amplifiers |
May 1966 | 4 Transistor Receiver Example Using Direct or Transformer Coupling MAT101 AC127 GET103=OC72/OC81 OA81 | ||||||
Class A Amp | Jan 1970 | Class A Battery Amplifier. Optional MW Tuning Head BC168C 40468A 2N3702 OA81 IS44 | ||||||
FM Spontaflex MkI |
Jun 1969 | 4 transistor FM Receiver BF225 BC168C 2N4058 OA81 | ||||||
FM Spontaflex MkII |
Feb 1972 | Several Modifications and Improvements | ||||||
L C Meter | Apr 1967 | Measures Inductance 7 to 2000 henrys Capacitance 0.002 to 1.5uf Also functions as a capacitor substitution box | ||||||
Jubilee AM/FM Receiver |
Jul 1977 | 3 Band 5 transistors 2N3663 BC169C 2N4289 2N3405 OA10 IS44 | ||||||
Export Spontaflex Portable |
Feb 1971 | Specifically designed for reception of Short Wave Broadcast Transmissions Attractive project for overseas constructors 2N3707 BC168B TIS61(2N3702) OA81 | ||||||
Infinite Resistance Voltmeter |
Oct 1968 | Draws no current at all from the circuit to which it is connected | ||||||
Variometer | Jul 1963 | Variometer tuned MW/SW Circuit One DF96 Valve and a Variometer from a No19 Set | ||||||
Fetaflex 4 Portable |
Apr 1970 | Double Reflex Receiver 40468 2N4291 2N4285 BC168C M3=LED | ||||||
Super Regenerative |
May 1965 | Super-regenerative 3 Transistor MW/LW Receiver MAT101 OC72 OA81 | ||||||
3 From 1 Short Wave Receiver |
Feb 1966 | Triode Pentode functions as aperiodic RF Amp. Detector with reaction and reflexed Triode Output 3A8GT | ||||||
VHF Reflex Portable |
Jan 1973 | 40 to 110 MHz AM/FM Low battery consumption BF167 BF169C BTY51 OA85 | ||||||
Simplicity and Sensitivity With 3 Transistors |
Nov 1965 | MW/LW Receiver with Loudspeaker Output MAT101 OC72 OA81 | ||||||
Twin Pentode Receiver |
Dec 1965 | Quality and Sensitivity with two Pentodes uses inductors from surplus RAF A1134A Amp. DAF96 DL96 | ||||||
Economic Amp and Variable Inductance Tuner |
Jan 1964 | 2 Transistor MW/LW Receiver with Loudspeaker Output OC44 OC72 OA81 | ||||||
Simple Circuits for Short Aerials |
Sep 1963 | 3 Circuits using a 1D8 Valve | ||||||
S.A.Junior Portable |
Nov 1972 | Sensitive and Selective 3 Transistor MW/LW Receiver with Loudspeaker Output BF115 2N4289 OA5 | ||||||
Kangaroo Radiogram |
Aug 1969 | Hybrid MW/LW Receiver & Record Player ST141 AC127 OC22 PL82 M3(LED) | ||||||
Quasistor Tuner |
Apr 1974 | Quasi-Stereo VHF Receiver BF167 BC169 2N4289 1GP5 | ||||||
Drachma Portable |
Dec 1975 | SW 5.5 to 22 Megs VHF 75 to 105 Megs BF115 BF167 BC169 OA90 | ||||||
M5 Pocket Receiver |
Apr 1977 | 4 Transistor MW Loudspeaker Circuit BF167 BC169 2N4289 BF115 1S44 | ||||||
Diodyne Receiver |
May 1980 | Mains powered Hybrid DL96 BFR81 BC169 OA90 | ||||||
Doric Multiband Receiver |
Aug 1979 | 6 Shortwave Bands plus MW/LW/VHF Comprehensive 21 page Construction Article BF115 OA90 1S44 2N4289 2N3405 2N3663 BC169 | ||||||
Local Station Tuner |
Feb 1968 | One Transistor Tuner for the Pentonlector Amplifier BSY27 M3(LED) | ||||||
Junior Radiogram |
Sep 1967 | Incorporating a Hybrid Local Station Tuner The Valve is heated for free as the heater is the emitter resistor of the output Transistor DL96 AC127 | ||||||
Simplicity and Sensitivity with two Transistors |
Apr 1964 | Simple MW Receiver MAT 101 | ||||||
Hybrid TRF |
May 1963 | MW Receiver DL96 OC44 OC72 | ||||||
Mains Reflex Circuit | Oct 1963 | Uses two 117N7 valves with 117V Heaters connected in series across the Mains NB.LIVE CHASSIS | ||||||
Port & Starboard Stereo Amplifier |
Oct 1976 | Unusual tone control.A single gang pot alters the tone of both channels by varying the current through two MES 6V bulbs BF244b 2N4289 AD161 | ||||||
Hiflex MW/LW Personal Receiver |
May 1973 | 2 Transistor headphone circuit 2N3819 2N4289 OA81/91 | ||||||
Biflexet |
May 1974 | 2 Transistor Local Station Loudspeaker receiver 2N3819 2N4289 | ||||||
Sliderule Receiver and Capacitance Meter |
May 1975 | Long Medium & Trawler band Measures Capacitance up to 5000pf BF167 BC169 OA10 | ||||||
Improving TRF Reaction |
Dec 1963 | Improving Reaction of the Pocket 4 Kit | ||||||
Double Reflex Personal Receiver |
Oct 1974 | Short Wave Biflexet Low Z Headphones 2N3819 2N4126 1S44 1SJ50 | ||||||
The Beta Meter | Oct 1967 | Simple Transistor Tester | ||||||
Cascode MW/LW Portable |
Feb 1978 | New High Gain Circuit 2N4058 BC169C | ||||||
The Dualine | Nov 1973 | VHF+MW Portable BF167 2N4289 BFY51 | ||||||
Economical Hybrid Amplifier |
Dec 1964 | With optional LW/MW Tuner DL96 OC75 OA81 MAT101 | ||||||
Modifying Published Designs | Jan 1967 | Usefull tips for the Radioconstructor | ||||||
Sliding Junior Amplifier | Jun 1973 | Sliding Bias Amp for the Hiflex Receiver 2N4289 BFY51 | ||||||
Mains Micro Amp | May 1978 | A Unique AF Amplifier DL96 BFR81 | ||||||
Sir Douglas Hall | Jun 2002 | About the Author | ||||||
Communication 3 Valve Superhet Reflex |
Dec 1943 | First Circuit Published in Practical Wireless | ||||||
Voltage Stabilisation for Car Radios |
Dec 1962 | First Circuit Published in The Radio Constructor | ||||||
Database | Jul 2002 | Title,Date,Wavebands,Transistors,Diodes,Valves Coils & Transformers used in every Receiver. Compiled by David Teague Comma separated text file.Loads into any spreadsheet | ||||||
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The following articles were published in Radio Bygones from 1990 to 2004 Back Issues are available here (please mention the website if ordering back issues) | ||||||||
Sir Douglas Hall His Life & Circuits |
Aug 2004 | A Tribute by Brian Austin G0GSF Radio Bygones No.90 | ||||||
6S3T Short Wave Receiver |
Feb 1999 | "Back to square one" Interesting article on the 6S3T by C.M.Lindars Radio Bygones No.57 | ||||||
Miniflex | Aug 1998 | 3 transistor MW Receiver OC44 OC72 LED Radio Bygones No.54 | ||||||
FM Tuner | Dec 1997 | Simple 2 Transistor Tuner 2N3663 or BFY90 OA81 Radio Bygones No.50 | ||||||
The Biflexet Audio Reaction Circuit |
Jun 1996 | 2 Transistors BF244B(TIS73L) BC258C similar to John Scott-Taggarts S.T.700 Radio Bygones No.41 | ||||||
60's style Portable |
Apr 1994 | 3 Transistor MW/LW Receiver ON222(BF181) BF254 BC258C Radio Bygones No.28 | ||||||
Vintage Circuits Updated |
Apr 1993 | Several updates and modifications to allow the use of currently available components where required Radio Bygones No.22 | ||||||
Singlevalve Loudspeaker Radio |
Jun 1991 | MW/LW Receiver using a singles 1D8 Valve Radio Bygones No.11 | ||||||
ALL COPYRIGHTS ARE THE PROPERTY OF THEIR RESPECTIVE OWNERS | ||||||||
Links | ||||||||
Radio Constructors Group BBS | ======= | A place for anyone interested in these circuits to share information help solve component availabilty problems etc.. | ||||||
The Radioconstructors Circuit Archive | ======= | Hosted by Maurice Woodheads excellent Vintage Radio Site Specialising in Valve Portable Restoration and vintage info & circuits Just follow the Radioconstructors Link for the Archive | ||||||
Circuit archive | ======= | More 50's 60's Articles & tons of Heathkit Gen. | ||||||
Big Links List | ======= | A Very Long List | ||||||
WebEE: The Electrical Engineering Homepage | ======= | Many Hobbyist Projects, Schematics & a mine of information | ||||||
The Best Net | ======= | Many links to Homebrews,Crystal sets, regens etc | ||||||
Ramon Vargas | ======= | Jfet & bipolar reflex & regen circuits | ||||||
Components | ||||||||
J.A.Crew. | ======= | Hardware Tools Surplus Electro-Mechanical Etc. | ||||||
Peter Roberts | ======= | Electronic Components | ||||||
Sycom | ======= | Electronic Components | ||||||
Bowood electronics | ======= | Electronic Components | ||||||
N.R.Bardwell | ======= | Electronic Components | ||||||
Electrovalue | ======= | Electronic Components | ||||||
Maplin | ======= | Electronic Components | ||||||
Keytronics | ======= | Electronic Components | ||||||
Semiconductors.UK | ======= | Electronic Components | ||||||
Ronlin | ======= | Electronic Components | ||||||
ESR | ======= | Electronic Components | ||||||
Harrisons | ======= | Electronic Components | ||||||
Marshalls | ======= | Electronic Components | ||||||
RSH Electronics | ======= | Electronic Components | ||||||
Colomor | ======= | Electronic Components | ||||||
Proops Bros. | ======= | Electronic Components | ||||||
Tech/Scientific | ======= | Electronic Components | ||||||
Crowthorne Tubes | ======= | Electronic Components | ||||||
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