I'm doing an assignment for school and I found a circuit that I would like to build for this assignment (see circuit attached http://www.edutek.ltd.uk/Binaries/Circuits/Survival_Game.pdf ). However, when I connect the the LM3914 on a breadboard, LED 9 from pin 11 lights up straight away and stays lit. Changing the signal doesn't affect LED 9 at all and stays lit. When I disconnect the signal from ground, all the LEDs from the output of the LM3914 light up and stay lit. When I connect the signal back to ground all the LEDs switch off except for LED 9 from pin 11.
The circuit is supposed to work in a way when the switch is pressed when the output of 555 timer is high the capacitor charges up. This then should increase the voltage supplied to pin 5 of the LM3914 and light up the bottom LED. When switch is pressed again at output high, LED2 from the output of the LM3914 should light up while the driver works in DOT display.
I've tested in circuit in simulation programmes such as livewire and the circuit works perfectly fine.
Any advice would be greatly appreciated.
The circuit is supposed to work in a way when the switch is pressed when the output of 555 timer is high the capacitor charges up. This then should increase the voltage supplied to pin 5 of the LM3914 and light up the bottom LED. When switch is pressed again at output high, LED2 from the output of the LM3914 should light up while the driver works in DOT display.
I've tested in circuit in simulation programmes such as livewire and the circuit works perfectly fine.
Any advice would be greatly appreciated.