Relay-Based ON/OFF Flip-Flop Remembers State During Power Failure | Electronic Design
What Is a Latching Relay? - Types of Relays
THORPNICS: Flip-flop or bistable latching using relays.
Relay - HomoFaciens
Latching Relay vs Flip Flop | AVR Freaks
Buy DC 6V 9V 12V 24V 4ch Flip-Flop Latch Relay Board Bistable Self-locking Electronic Switch Module for Arduino UNO IO Control at affordable prices — free shipping, real reviews with photos —