As a switch is used a relay driven by a transistor which is driven from the out put ... Touch switch activated relay – source A very simple touch switch circuit diagram can be constructed using this ...

Load switches are increasingly found in today’s portable electronic devices, providing a simple and smart method ... to a specified load when the pass transistor is on. The figure below shows an ...

The two diagrams above are of the same circuit ... This now allows the base leg of the NPN transistor to switch on, allowing current to flow from the collector to the emitter legs, activating ...