This circuit provides a reference voltage of 2.5 V adjusted in the trimpot. The transistor can be the BC558 (in the drawing it came out as NPN). The control is done by a rectangular input signal.
This bistable touch circuit using CMOS technology controls a relay. The supply voltage must be...
We found this micro amplifier in a technical documentation from National Semiconductor. The...
This simple neon alternating flashing circuit was found in an old American publication. The...