This is a challenge contest circuit sensitivity. in press. Can be played simultaneously by up to 4 people on one hit before. There are bright lights show the number of people who are pressing.
When raising the power supply circuit, and switch to either one up.
Suppose that the first switch S1, a current will flow through R2 into the leg to trigger the gate (G) of the SCR as a result, the flow between the SCR anode pin (A) and cathode pin (K). The LED1 is lit hold.
Working in this manner will allow only work one by one only. Because when the press sets a precedent to work, then send the output to lock the other later press against multiple performance metrics up. Until a new reset circuit, the switch S5 is press play to start a new one.
Up to $20 shipping discount on first order now: https://jlcpcb.com/quote