Suggested Circuits of G.A.French

160 Suggested Circuits of G.A.French

Published in The Radio Constructor

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TITLE	DATE	DETAILS
TTL Current Monitor	Sep1980	Monitoring TTL Current
IC Luxembourg Booster	Jun1968	IC Luxembourg Booster: RCA CA3011
High-Res Voltmeter	Apr1967	Simple High Resistance Voltmeter: OC202 OAZ203
LDR Speed Control	Jan1971	LDR Motor Speed Control: ORP12 ACY19 OC26
Visual Bell Indicator	Mar1971	Visual Bell Indicator: ACY19
Audio Injection Probe	Sep1961	Pocket Audio Injection Probe: OC72
Hangman	Jan1979	Electronic Hangman: CD4011 CD4017 BC107
Voltage Reference Unit	Apr1971	Oscilloscope Voltage Reference Unit
Zener Diode Analyser	Feb1981	Zener Diode Analyser: LM334Z LF351
Triode Timer	May1962	Timer: 6J5 (ECC81 ECC82 12AT7 12AU7)
LDR Muting Circuit	Jul1967	LDR Muting Circuit: Mullard ORP12
Switch-Off Reminder	Sep1970	Switch Off Reminder: ACY19 AD161 BY100
Inertia Switch	Aug1969	Inertia Switch: CRS1/05
Computer	Oct1967	Parallel-R Series-C Computer: ACY19
Voltage Monitor	Jun1970	Simple Voltage Monitor: ACY19
Record Player Amplifier	Mar1960	With Feedback Bass & Treble Controls: ECL83
The 40-20 Game	Apr1980	Electronic Game: CD4020 CD4011 Ultra-Bright LED's
Temperature Switch	Jan1962	Temperature Operated Switch: OC72 STC CZ10
Proximity Detector	Oct1969	Sensitive Proximity Detector: OC44 BC168C ACY19
Quiz Selector	Oct1979	Ultra Simple Quiz Selector: BC107
Neon Test Unit	Jun1960	Versatile Neon Test Unit
Latch Circuits	Nov1975	Multi-Way Latch Circuits: BC107
Fractional Resistance	Feb1966	Fractional Resistance Measurements
Magic Number Indicator	Mar1972	Magic Number Indicator
Oscilloscope Calibrator	Jul1980	Oscilloscope Voltage Calibrator: BC214L BC184L 7555
Alignment Aid	Apr1972	Novel Alignment Aid
Remote Control	Oct1961	Experimental Remote Control: 12AT7
Record Player Amplifier	May1964	With Microphone Input: ECC83 EL84
7555 Touch Buttons	Mar1980	Touch Buttons: ICM7555
Switching Indicator	Feb1967	Visual Switching Indicator: ACY18
Light Operated Counter	Jan1974	Light Operated Counter: OCP71 BC214L MJE340 BY100
Bottom-End Coupling	Jul1963	Adding Bottom-End Coupling to Ferrite Rod Aerials
Touch Button Pinger	Mar1979	Touch Button Bell Pinger: BC107 BD124
Combination Lock	Apr1974	Combination Lock: ACY18 BC107
Record Player Amplifier	Jan1970	Experimental Record Player Amplifier: BC168C OC36
Guard Wire Alarm	Nov1979	CMOS Guard Wire Alarm: CD4011 BC107
Stereo Balance Indicator	Aug1959	Magic Eye Balance Indicator: EM81 ECC82
Testmeter Convertor	Aug1961	High Impedance Testmeter Convertor: 12AT7
Switch Off Indicator	Nov1964	Switch Off Indicator: OC72
Regulated Power Supply	Jun1974	Current Limited Regulated Power Supply: BD124
Solid State Relay	Oct1971	Solid State Relay: ORP12 BC107 BD124
Record Player Amplifier	Apr1973	High Input Impedance Amp: BC107 ACY18 AC127
Timer	Jun1978	Low Current Timing Circuit: CD4011 BC214L
Tuning Indicator	May1965	Pilot Lamp Tuning Indicator: ACY18
Capacitance Meter	Jun1972	1uF to 12000uF: BC107 BC214L ACY18
Capacitance Bridge	May1972	<1pf to 0.025uF: BC107
Record Player Amplifier	Mar1963	Record Player Amp: ECC82 EL91 EZ80
Record Player Amplifier	Aug1962	Live Chassis: UL84 UY85
CMOS 7555	Jan1980	Using CMOS 555: ICM7555
Ohmmeter	Feb1973	IC Ohmmeter: ML741 BC214L
Sequence Switch	May1978	On-Off Sequence Switch: BC107
Reaction Timer	Nov1966	Reaction Timer: 12AT7 OAZ204 OAZ213
High Output Metronome	Jul1973	Unijunction Metronome: 2N2646 BD124
ZN414 Receiver	Mar1975	ZN414 Receiver: TIL209 BC214L MFC4000
Reed Switch Circuits	Mar1965	Magnetically Operated Dry Reed Switch Circuits
Burglar Alarm	May1981	Alarm with Entrance Delay: CD4011 2N3906 BC107
Microammeter	Jan1973	Sensitive Microammeter 5uA FSD: ML741C
Varying Impedances	Jun1963	Varying Impedances by Step Up Transformer
Door Alarm	Nov1971	Triggered Door Alarm: ACY19
Binary NIM	Aug1971	Binary NIM
Electronic Timer	May1976	One Shot Timer: ACY19 BC214L
Regenerative Detector	Apr1963	Experimental Regenerative Detector: ECL86
Capacitance Bridge	Jul1974	Unusual Multivibrator Capacitance Bridge: ACY18
Gain Meter	Jan1981	Transistor Gain Meter: 78L05
DC Voltmeter	Dec1972	High Impedance DC Voltmeter: 741C
The Magic Hand	Dec1980	Hand Capacitance Switch: NE555 CD4011 2N3904
Vibrato Unit	Jul1960	Vibrato Unit for Guitar Amplifiers: ECC82 12AU7
AF Clipper	Feb1974	Adjustable AF Clipper: BC214L BC184L
Metronome	Nov1972	Photographers Metronome: ACY18 BC214L
Electro Magnetic Counter	Dec1973	Electro Magnetic Circuits: MJE340
Silicon Rectifier Dropper	Jan1963	Silicon Rectifiers as Heater Droppers: BY100 ORP12
Power Supply	Oct1972	Dual Voltage Power Supply
Nand Gates	Dec1978	Discrete Nand Gates: BC107
Pinging Bell	Oct1978	Pinging Bell Circuits: 2N2646 BD124 BC107
A.C. Millivoltmeter	Oct1973	High Impedance A.C. Millivoltmeter: BC107 ACY18
Burglar Alarm	Sep1959	Simple Burglar Alarm
Triac Timer	Sep1973	Triac Photographic Timer: BC107 40430
Class A Amplifier	Aug1973	Class A Amplifier: BC107 MJE340
Electronic Timer	Oct1962	Timer With Fast Relay Operation: OC72
Battery Monitor	Sep1972	Automatic Battery Monitor: CRS1/05
The Nightrider	Aug1972	Nightime Radio Timer Switch: BC107 BD124
Linear Ohmmeter	Nov1980	Linear Ohmmeter: LM334Z LF351 2N3906
Zener Rectifier	Apr1968	Reference Voltage Zener Rectifier
Automatic Garage Light	Sep1975	Automatic Garage Light: ORP12 CA741 NE555 ACY19
Hybrid AF Mixer	Dec1964	Hybrid Mixer for AF Amplifiers
LDR Circuits	Jun1962	LDR Control Circuits: Mullard ORP12
Digital Lamp Display	Jan1972	Pilot Lamp Digital Display: 68 Diodes
Theatrical Ringer	Apr1962	Telephone Ringer for Theatrical Use: OC72
DC Null Indicator	Dec1959	Very Sensitive DC Null Indicator: 12AX7 6AM5
Capacitance Lock	Oct1980	Capacitance Combination Lock: BC107 CD4011
Relaxation Oscillator	May1963	2 Transistor Relaxation Oscillator
Valve Voltmeter	Feb1963	Pocket Valve Voltmeter: DM70
Touch Button	Jan1975	Touch Button Circuits: BC107
Flasher	Mar1967	One Minute Flasher: ACY19
Dual Oscillator	Mar1974	Dual Tone Oscillator: 2N2646 BC107 ACY18
LDR Volume Control	Sep1962	Remote LDR Volume Control: Mullard ORP12
Voltmeter	Aug1975	Voltmeter with a Memory: BC107
Frequency Marker	Jan1960	Very High Stability Frequency Marker: EF80 EB91
Periodic Switch	Feb1962	Long Cycle Periodic Switch: CZ10
Signal Booster	Mar1968	Car Aerial Signal Booster: OC171
Class A Amplifier	Dec1974	Constant Current Class A Amp: BC107 ACY18 BD124
Musical Voltmeter	Sep1978	Musical Voltmeter: 2N2646 741 Op Amp
Dual Power Supply	Sep1968	Dual Voltage Power Supply
Alarm Switch	Dec1968	Thyristor Alarm Switch: CRS1/05
Successive Switch	Feb1972	Versatile Successive Switch: BC107 ACY18
Voltage Monitor	Feb1976	Battery Voltage Monitor: 741 Op Amp
Memory Unit	Aug1964	Mains Transformer Memory Unit
Variable Power Supply	Dec1970	Experimenters Power Supply: OC36
Protection Circuit	Jul1970	Current Protection & Trip: CRS1/05 AD161
Neon Voltmeter	Jan1967	Simple Neon Lamp Voltmeter
Constant Current Source	Jan1976	LED Constant Current Source
Variable Power Supply	Aug1963	Variable High Voltage Power Supply: Mullard PL81
Computer	Nov1967	Simple Product Computer: ACY19
DC Heater Supply	Aug1967	Simple DC Heater Supply for AF Amplifiers
Voltmeter	Jul1968	Simple FET Voltmeter: RCA40468
Battery Indicator	Jan1968	Battery Voltage Indicator for Transistor Equipment
Neon Circuits	Sep1958	2 & 3 Stage Sequential Neon Circuits
Continuity Tester	Aug1978	Continuity-Leakage Tester: BC107 TIL209
BFO	Aug1966	Simple Add On BFO: OC44
HT Delay	Mar1970	Simple HT Delay Switch: PY81
Timer	Aug1968	Snap Action Electronic Timer: ACY19
DC Multiplier	Feb1968	DC Voltage Multiplier: ACY19 OC44 AC127
MW Wavetrap	May1968	Regenerative MW Wavetrap: OC44
Failure Indicator	Sep1966	Flashing Fuse Failure Indicator
Overload Protector	Jun1964	Mains Overload Protection Device: VR105/30
Battery Saver	Sep1969	Battery Saver for Bedside Radios: BC168C ACY19
AF Oscillator	May1970	Neon-LDR AF Oscillator: Mullard ORP12
Continuity Tester	Jun1969	Pocket Continuity-Leakage Tester: BC168C ACY19
Telepathy	Dec1965	Electronic Telepathy: OC45 OC72 12AX7 6BW6
Electronic Candle	Oct1964	Blow Out a Light Bulb: STC CZ10
Transistor Checker	Oct1970	Simple Transistor Checker
Thyristor Circuits	Jul1976	Voltage Conscious Thyristor Circuits: CRS1/05 BD124
Egg Timer	Jul1972	Electronic Egg Timer: BC107
Remote Switch	Feb1969	Simple Remote On/Off Switch
Power Supply	Jan1969	Variable Voltage Power Supply: ACY19 OC36
Unusual Timer	Dec1962	Timer using a LDR: Mullard ORP12
Zener Tester	Nov1974	Zener Diode Checking Unit
Oscillator Checker	Nov1962	Transistor Radio Oscillator Checker: OC44 OC72 OA79
Mains Isolator	Apr1975	LED-LDR Isolator: BC107 TIL209 40430 ORP12
Multivibrator	Dec1966	Multivibrator with singe resistance control: ACY18
Mains Monitor	Sep1971	Audible Mains Failure Indicator:
Mic. Matching Unit	Oct1968	Crystal Microphone Matching Unit: 40468
Remote Control	Aug1970	Four Way Remote Control:
Sequential Oscillator	Jun1975	Sequential transistor Oscillator: ACY19
Precedence Indicator	Sep1967	Press Button Precedence Indicator:
Voltage Monitor	Jan1966	Fixed Voltage Monitor: ACY18 AC127 OAZ203
Visual Bell	May1960	Visual Bell Indicator for the Deaf: OC72 OA91
3 Volt Neon Tester	Dec1969	Neon Leakage Tester: ACY19
Counting Circuit	Apr1970	Simple Relay Counting Circuit
Transistor Gain Meter	Apr1976	Meterless uses a relay & L.E.D: TIL209
Neon Bistable	Jun1967	Bistables using Neons & LDR's: Mullard ORP12
Capacitance Meter	Sep1974	Electrolytic Capacitance Meter: 40468A
Water Level Sensor	Nov1970	Efficient Water Level Sensor: ACY19 BC169C (Twentieth year of the Suggested Circuit Series)
Insulation Tester	Oct1959	Insulation Tester using EM81 Magic Eye
Megohmmeter	Mar1969	High Value Ohmmeter: 40468
Resistance Sub Box	Sep1964	Geometric Progression Resistance Box
Capacitance Bridge	Nov1968	Low Value Capacitance Bridge: 40468 ACY18
Jack Plug Key	Aug1976	Electronic Lock Operated by a Resistor: BC107
Dry Joint Detector	May1971	Very Low Ohmmeter
Twin T	Dec1971	Twin T 200 Khz Receiver: BC107
Coil Coverage Tester	Jul1969	Coil Coverage Test Unit: BC168C
Transistor Tester	Feb1971	Good Transistor Gain Meter
Signal Injector	Apr1969	Broadband Signal Injector: BC168C
AC Mains Voltmeter	Mar1964	Expanded Scale Voltmeter: VR105/30
Radio Time Switch: VK1011	Jun1981	The Final "Suggested Circuit" of the Series which ran for over 30 Years. Sadly The Radio Constructor Magazine Demised Two Months Later
		Under Construction: More to add when time permits
		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
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Components
J.A.Crew.	=======	Hardware Tools Surplus Electro-Mechanical Etc.
Sycom	=======	Electronic Components
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6V6	=======	Electronic Components
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Semiconductors.UK	=======	Electronic Components
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Marshalls	=======	Electronic Components
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