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Database

The Ingenious Circuits of Sir Douglas Hall

Published in The Radio Constructor, Radio Bygones & Practical Wireless

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Click on the dates below for circuit diagrams: Full articles in the left column

ARTICLE 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
Lisa 2 Band portable Sep 1980 SuperAlpha LW/MW Loudspeaker Circuit
2N3663 BC169C
3 band portable Dec 1974 2T Reflex 19 to 60 metres
2N3819 2N4126 2N4289 BFY51
F E T Twin May 1972 Medium Power Stereo Amp
40468A 2N4289 AD161
Various Circuit Updates Mar 1981 Updates to the M5: Jubillee: Cascade: Doric: Lisa:
FM: Superregen
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



The following articles were published in
Radio Bygones from 1990 to 1999
Back Issues are available here
(please mention the website if ordering back issues)
Vintage Circuits
Updated
Apr 1993 Several updates and modifications to allow the use of
currently available components where required
Radio Bygones No.22

The Biflexet
Audio Reaction Circuit
Jun 1996 2 Transistors BF244B(TIS73L) BC258C
similar to John Scott-Taggarts S.T.700
Radio Bygones No.41

Singlevalve
Loudspeaker Radio
Jun 1991 MW/LW Receiver using a
singles 1D8 Valve
Radio Bygones No.11

FM Tuner Dec 1997 Simple 2 Transistor Tuner
2N3663 or BFY90 OA81
Radio Bygones No.50

Miniflex Aug 1998 3 transistor MW Receiver
OC44 OC72 LED
Radio Bygones No.54

60's style
Portable
Apr 1994 3 Transistor
MW/LW Receiver
ON222(BF181) BF254 BC258C
Radio Bygones No.28

6S3T
Short Wave
Receiver
Feb 1999 "Back to square one"
Interesting article on the 6S3T
by C.M.Lindars
Radio Bygones No.57

Early Transistor & Diode Data Ediswan/Mazda   G.E.C.   S.T.C.   A.E.I. Hivac   Texas  
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
The Circuit Archive ======= More Magazine Articles also Heathkit & Dynaco Info.
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
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