We found this circuit in a Poptronics from 1998. The circuit can be extended to more competitors with another 4011. The power can be made with voltages from 6 to 12 V.
This traditional 555 touch bistable configuration has already been explored in projects on this...
November 2016 - The new Ohmite TO-126 power resistors in the range of 0.09 Ω to 51 kΩ with...
This circuit uses a phototransistor as sensor. The changes in the resistance of the transistor,...