This optically isolated Monostable Flop-Flop (code: JPL-111A2) is universal module for general purpose. It has one optically isolated start input and one optically isolated reset input. Output is available on a header (J5) and on SPDT power relay. The Monostable starts with a rising edge at START input, switch the relay on for an adjusted time. After the time elapsed, the relay switch off. With a rising edge at RESET input during the hold time the relay is switched off immediately. Input impedance of both inputs is 50Ω
The module board measuring 63 x 44 mm, is equipped with THD components because I created it for teens who want to learn how to solder components. Module can be powered either from AC 4V ... 11V or from DC unregulated +5V ... +15V.

Fig. 1 - Optically Isolated Monostable Flip-Flop