This circuit was found in the January 1999 issue of Electronics Now magazine. The turn-on time is given by the capacitor and MOSFET and must be in accordance with the controlled load.
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...
This high impedance circuit for low voltage sensors was found in a 1980s documentation. The JFETs...
This is an old configuration that can be modified to operate with 5 V (use 1k on the base...