With the capacitor used, this circuit provides delays of 40 to 60 seconds. Larger capacitors can be used, and the SCR supports an equivalent. The circuit is from the 1977 RC semiconductor manual.
This circuit was found in July 1986 Radio Electronics magazine. The maximum current is 1.5 A. The...
This circuit activates 5 LEDs according to the level of the analog input signal and can be used...
This circuit is from an old American documentation and its use in motorcycles with 12 V is...