We found this circuit in an Australian publication from 1991. It is a kit of the time with input for a guitar pickup. The range is a few tens of meters.
We found this circuit in a 1999 publication. All the components used are still common and the...
This switch circuit for an incandescent lamp can have its duty cycle programmed by the...
This circuit can indicate when a high voltage exceeds a certain value, with the transition of its...