Welcome to the Circuit Callenge section of ElectronicsWeekly.com. Reason with the circuit schematic to identify the missing component and you could win a prize.
Each month we will be giving £25 Amazon vouchers to one randomly-selected winner.
Competition - One of our components is missing!
Mar/Apr 2010 (closing date Friday 16 April)
The component blacked out behind the circles is a...
CLOSED: #9, Jan/Feb 2010 (closing date Friday 19 February)
Congratulations to one Mr Cobbett, our randomly selected winner, who identified the missing component as a capacitor. He wins the £25 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Five- to 10-LED flashlight circuit runs at 3V
The component blacked out behind the circles is a...
CLOSED: #8, Oct/Nov 2009 (closing date Friday 20 November)
Congratulations to one Mr Lovis, our randomly selected winner, who identified the missing component as an inductor. He wins the £25 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Convert negative inputs to positive outputs
The component blacked out behind the circle is a...
CLOSED: #7, Sep/Oct 2009 (closing date Friday 9 October)
Congratulations to one Mr Nagesh, our randomly selected winner, who identified the missing component as a resistor. He wins the £25 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Simple two-transistor circuit lights LEDs
The component blacked out behind the circle is a...
CLOSED: #6, July/Aug 2009 (closing date Friday 14 August)
This one proved easier for you than #5, but congratulations to one Mr Bloor, our randomly selected winner, who identified the missing component as a diode. He wins the £25 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Single pin controls relay, intermittent buzzer, and status LED
Clue: This circuit involves status indicators for switching applications.
The component blacked out behind the circle is a...
Diode
Capacitor
Inductor
Resistor
I don't know!
CLOSED: #5, June 2009 (closing date Friday 26 June)
This one stumped most people, but congratulations to a Mr Johnson, our randomly selected winner, who identified the missing component as an inductor. He wins the £50 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Cheap and easy inductance tester uses few components
Clue: This circuit provides an alternative to expensive test equipment.
The component blacked out behind the circle is a...
Diode
Capacitor
Inductor
Resistor
I don't know!
CLOSED: #4, May 2009 (closing date Friday 15 May)
Congratulations to Mr French, our randomly selected winner who identified the missing component as a diode. He wins the £50 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Configure a low-cost, 9V battery-voltage monitor
Clue: This circuit diagram is referenced in a Circuit Design Idea covering a battery voltage monitor.
The component blacked out behind the circles is a...
Diode
Capacitor
Inductor
Resistor
I don't know!
CLOSED: #3, March 2009 (closing date Friday 10 April)
Congratulations to Mr Parrott, our randomly selected winner who identified the missing component as a capacitor. He wins the £50 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Add charging status to simple lithium-ion charger
Clue: This circuit diagram is referenced in a Circuit Design Idea covering the charging status for a a lithium-ion cell charger.
The component blacked out behind the circles is a...
Diode
Capacitor
Inductor
Resistor
I don't know!
CLOSED: #2, February 2009 (closing date Friday 6 March)
Congratulations to Mr Kitney, our randomly selected winner who identified the missing component as a resistor. He wins the £50 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: Swapping bits improves performance of FPGA-PWM counter
Clue: This circuit diagram is referenced in a Circuit Design Idea mentioning a PWM module and a simple lowpass filter.
The component blacked out behind the circle is a...
Diode
Capacitor
Inductor
Resistor
I don't know!
Name:
Email:
CLOSED: #1, January 2009 (closing date Friday 6 February)
Congratulations to Mr Exton, our randomly selected winner who identified the missing component as a diode. He wins the £50 Amazon voucher. To shed more light on the circuit please see Figure 1 of this Circuit Design Idea: One microcontroller pin drives two LEDs with low quiescent current
Clue: This circuit diagram is for battery-powered designs, minimising quiescent current. Check out the forward voltage on the Kingbright LED in the schematic: KP-2012 data sheet.
The component blacked out behind the circles is a...
Diode
Capacitor
Inductor
Resistor
I don't know!
Name:
Email: