This setting applies to virtually any photo transistor and any operational amplifier. The power supply must be symmetrical, and the gain is determined by the relationship between R2 and R1.
This circuit uses the flip-flops from the previous circuit to implement a 3-digit binary counter. The...
The voltage comparator used in this application is the NCX2220 from NXP. What this circuit does is...
The UVTRON tube is an ultraviolet radiation sensor. In this circuit from Radio Electronics from...