555 Timers - How a One Shot Timer Works -- The Learning Circuit 71

555 Timers - How a One Shot Timer Works

The Learning Circuit | element14 presents | Project Videos

Karen has been digging into 555 timers for a bit now. In a previous video, she did an overview of the 3 different modes in which a 555 timer can be used. In this video, Karen goes into further detail about one of those modes: Monostable. Monostable mode is also known as a “one-shot” timer. In this mode, a single input signal of the 555 timer triggers it’s output to go high. The design of the rest of the external circuit will then cause the output to automatically reset back to low. Karen explains what’s happening inside the 555 to make this work, as well as showing a practical example of how to create this circuit on a breadboard.

Bill of Material:

Product Name	Manufacturer	Quantity	Buy KitBuy Kit
Breadboard, MCM 60 rows, ABS, 8.5mm, 165mm x 56mm	Multicomp	1	Buy NowBuy Now
LM555CN - Timer, Oscillator & Pulse Generator IC, TTL Compatible, Astable, Monostable, 4.5 V to 16 V, DIP-8	On Semiconductor	1	Buy NowBuy Now
Ceramic Disc Capacitor, 0.01 µF, 100 V, ± 20%, 5 mm	Vishay	1	Buy NowBuy Now
140 Pc. Jumper Wire Kit, 22 AWG, Solid, Assorted Lengths and Colors	Twin Industries	1	Buy NowBuy Now
Through Hole Resistor, 220 ohm, 400 mW, ± 1%	Vishay	1	Buy NowBuy Now
Through Hole Resistor, 1 kohm, 500 mW, ± 1%	TT ELECTRONICS / WELWYN	2	Buy NowBuy Now
Red LED, Through Hole, 5mm, 20 mA, 2.1 V	LED TECHNOLOGY	1	Buy NowBuy Now
Tactile Switch, 12mm, Yellow, Top Actuated, Through Hole, Round Button, 24 VDC, 50mA	Omron	1	Buy NowBuy Now
Tactile Switch, 12mm, Red, 12 VDC, 50mA	Multicomp	1	Buy NowBuy Now