The original application of this 1967 Ferranti circuit can be changed so that it functions as a pass sensor shield for gears and other moving objects.
January 2017 - Texas Instruments' new TLVx172 operational amplifiers with Rail-to-Rail outputs can now be...
The selected circuit causes a 12 V lamp with a current of up to 500 mA for the BD135 transistor to flash at...
We find this circuit in an old documentation, but it can be implemented with modern equivalent...