We found this circuit in the 1957 Raytheon transistor application manual. The transistor can be a BC558 and the common 6 V relay, just by using this voltage in the supply.
This high current regulator with low voltage drop was found in the datasheet of the used...
Coupled to a bell, this year 2000 circuit provides an indication for attendance, if the person is...
This circuit lights up a warning LED (tilt) when a device in which the mercury key is located is...