Toggle Sign Using an SR Flip-Flop
In the last lesson episode, Karen explored SR and JK flip flops. In this episode, Karen uses an SR Flip Flop with Preset and Clear to demonstrate how the inputs affect the outputs. Using that circuit and no additional parts, Karen shows how to use that flip flop to create a toggle circuit. The final project shows how the circuit can be used to create a Yes/No, Either/Or sign.This circuit is just the beginning. Adding a 555 timer or sensors instead of a button opens the door to the many different ways this circuit can be useful in an everyday item.
Bill of Material:
| Product Name | Manufacturer | Quantity | Buy KitBuy Kit |
|---|---|---|---|
| Super Bright White 5mm LED (25 pack) | ADAFRUIT | 2 | Buy NowBuy Now |
| Red LED, Through Hole, 5mm, 20 mA, 2.1 V | LED Technology | 1 | Buy NowBuy Now |
| LED, Green, Through Hole, T-3 (10mm), 20 mA, 2.2 V, 568 nm | Kingbright | 1 | Buy NowBuy Now |
| Flip-Flop, 74LS74, D, 13 ns, 33 MHz, 16 mA, DIP | TEXAS INSTRUMENTS | 1 | Buy NowBuy Now |
| Prototype Board, Phenolic, 1.6 mm, 45 mm, 91 mm, (2) small | Multicomp | 1 | Buy NowBuy Now |
| Rocker Switch, On-Off, SPST, Panel | ZF ELECTRONICS | 1 | Buy NowBuy Now |
| Through Hole Resistor, 10 kohm, 250 mW, ± 1% | TE Connectivity | 4 | Buy NowBuy Now |
| Through Hole Resistor, 100 ohm | Multicomp | 2 | Buy NowBuy Now |
| Through Hole Resistor, 220 ohm, 400 mW, ± 1% | Vishay | 2 | Buy NowBuy Now |
| Tactile Switch, 6mm, Black, Tall, 12 VDC, 50mA | E-switch | 4 | Buy NowBuy Now |
| Tactile Switch, 12mm, Black, Tall, 24 VDC, 50mA | Alcoswitch | 1 | Buy NowBuy Now |
| Hook-up Wire Spool Set - 22AWG Solid Core - 6 x 25 ft | Adafruit | 1 | Buy NowBuy Now |
| 9V battery snap, flexible | Multicomp | 1 | Buy NowBuy Now |
| Battery, 9 V, PP3, Alkaline | Pro Elec | 1 | Buy NowBuy Now |
| Linear Voltage Regulator, 7805, Fixed, 10V To 35V In, 5V And 1A Out, TO-220-3 | ON SEMICONDUCTOR | 1 | Buy NowBuy Now |
Additional Parts:
| Product Name |
|---|
Super Bright White 5mm LED (25 pack) - PRODUCT ID: 754 - adafruit.com |