The Ingenious Circuits of Sir Douglas Hall
Published in The Radio Constructor, Radio Bygones & Practical Wireless
Click on the TITLE for the Circuit Diagram
Click on the DATE for Full Construction Details
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Circuits for 2, 3 & 4 transistor receivers
MAT101 OC72 OA81
2N3707 2N2926 OA81
LW/MW down to 120 metres
BF167 BC169C OA10
Short Wave
Receiver
MAT101 MAT121 OA81
Short Wave
Receiver
2N3707 2N3663 BC169C OA81
Portable
Receiver
MAT101/121 OC81 GEX64(CV2310)
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
2N3707 2N2926
All Wave Radio
from 16 to 2000 metres
ECH83 BFR99 BC169 OC22 IS44
2N3707 BF115 BC169C OA91
Volume Control
RF Gain: Regeneration: AF Gain
XA101 MAT101 AC127 OA81
Portable
Built in Wavetrap
2N2926 BC169C 2N3663 OA10
From 150 to 2100 Metres
MAT101 EL41 OA81
100pf tunes the full MW band
BF225 2N3707 BC168B OA73
Super Alpha Pair
MAT101/121 OC200 BSY26/27 OA73
Exceptional Selectivity and Sensitivity
BFY51 BC168B BF115 OA5
(for OA5 use base/emitter junction of AC176 or similar)
2N4289 BC169C DL96
Portable
BC169C 2N3663 2N4289 2N3707 2N3405
OA81/91 IS44 BZY88C6V2 BZY88C3V0
Quasi-Stereo Effect on Mono
BC168/169 AD162 OA91 DD000
Draws only 100mA from Car Battery
3Q5GT(DL33) MAT101/121 GECS5=ACY19/ACY21
Amplifier
Good Quality reproduction
PL82 XC141 DD000
Car Radio
3 Transistor 1 valve Hybrid
2N4289 BC169C AD161/AD162 ECH83
2N4058 2N2926 OA73
output when a strong local signal is available
GET114 or GET103 OA81
OC44 OA81
Portable
Positive feedback bass boost control
BF115 BC169C OA73
3 or 4 Transistor Circuits
MAT101 XA701 AC127 GET103 OA81
Challenger
Battery economy equal to Class B
BC168C MC140 or BFY51
BC169C BF115 OA73
Dual Purpose
Receiver
AF117 ACY21 M3=LED
ST141 AC127 M3=LED
BF115 M3=LED
Loudspeaker output and only 3mA consumption
40468A BF115 M3=LED
Mains or Car Battery Powered
2N4058 BC168B OC22 OA202 DD000 EF97
Car Radio
2 Valve 4 Transistor Hybrid
2N4058 2N2926 OC19 OA81 GEX64(CV2310) EF97
Amplifiers
Using Direct or Transformer Coupling
MAT101 AC127 GET103=OC72/OC81 OA81
Optional MW Tuning Head
BC168C 40468A 2N3702 OA81 IS44
MkI
BF225 BC168C 2N4058 OA81
MkII
and Improvements
Capacitance 0.002 to 1.5uf
Also functions as a capacitor substitution box
AM/FM Receiver
2N3663 BC169C 2N4289 2N3405 OA10 IS44
Spontaflex
Portable
Specifically designed for reception
of Short Wave Broadcast Transmissions
Attractive project for overseas constructors
2N3707 BC168B TIS61(2N3702) OA81
Resistance
Voltmeter
from the circuit to which
it is connected
One DF96 Valve and a Variometer from a No19 Set
Portable
40468 2N4291 2N4285 BC168C M3=LED
Regenerative
MW/LW Receiver
MAT101 OC72 OA81
Short Wave
Receiver
aperiodic RF Amp. Detector with reaction
and reflexed Triode Output
3A8GT
Portable
Low battery consumption
BF167 BF169C BTY51 OA85
With 3 Transistors
MAT101 OC72 OA81
Receiver
uses inductors from surplus RAF A1134A Amp.
DAF96 DL96
Inductance Tuner
MW/LW Receiver
with Loudspeaker Output
OC44 OC72 OA81
for Short Aerials
Portable
MW/LW Receiver
with Loudspeaker Output
BF115 2N4289 OA5
Radiogram
ST141 AC127 OC22 PL82 M3(LED)
Tuner
VHF Receiver
BF167 BC169 2N4289 1GP5
Portable
VHF 75 to 105 Megs
BF115 BF167 BC169 OA90
Receiver
Loudspeaker Circuit
BF167 BC169 2N4289 BF115 1S44
Receiver
DL96 BFR81 BC169 OA90
Receiver
Comprehensive 21 page Construction Article
BF115 OA90 1S44 2N4289 2N3405 2N3663 BC169
Tuner
for the Pentonlector Amplifier
BSY27 M3(LED)
Radiogram
The Valve is heated for free
as the heater is the emitter resistor of the output Transistor
DL96 AC127
with two Transistors
MAT 101
DL96 OC44 OC72
NB.LIVE CHASSIS
Stereo Amplifier
of both channels by varying the current
through two MES 6V bulbs
BF244b 2N4289 AD161
Personal Receiver
2N3819 2N4289 OA81/91
Loudspeaker receiver
2N3819 2N4289
Capacitance Meter
Measures Capacitance up to 5000pf
BF167 BC169 OA10
Reaction
the Pocket 4 Kit
Personal Receiver
Low Z Headphones
2N3819 2N4126 1S44 1SJ50
Portable
2N4058 BC169C
BF167 2N4289 BFY51
Hybrid Amplifier
DL96 OC75 OA81 MAT101
for the Hiflex Receiver
2N4289 BFY51
DL96 BFR81
3 Valve Superhet Reflex
in Practical Wireless
Improved Scans Added April 2008
for Car Radios
in The Radio Constructor
Coils & Transformers used in every Receiver.
Compiled by David Teague
Comma separated text file.Loads into any spreadsheet
Radio Bygones from 1990 to 2004
Back Issues are available here
(please mention the website if ordering back issues)
His Life & Circuits
Radio Bygones No.90
Short Wave
Receiver
Interesting article on the 6S3T
by C.M.Lindars
Radio Bygones No.57
OC44 OC72 LED
Radio Bygones No.54
2N3663 or BFY90 OA81
Radio Bygones No.50
Audio Reaction Circuit
similar to John Scott-Taggarts S.T.700
Radio Bygones No.41
Portable
MW/LW Receiver
ON222(BF181) BF254 BC258C
Radio Bygones No.28
Updated
currently available components where required
Radio Bygones No.22
Loudspeaker Radio
singles 1D8 Valve
Radio Bygones No.11
help solve component availabilty problems etc..
Specialising in Valve Portable Restoration and vintage info &
circuits Just follow the Radioconstructors Link for the Archive
