Free Simple Circuit Diagram
The figure below show us a zener regulator. The essential component is the dropping resistor R which the value given by (V-Vo)/I, where I is the desired output plus 10%. As long as the supply voltage V is constant, the current in thner current drops to zero, and we is resistor is constant and is shared between the Zener and […]
Read more
We can purchase DC motors with or without brushes with ac tachometer outputs already provided by the manufacturer. A very low cost speed control can be constructed with these motors in combination with the LM2907. The most simple version is illustrated in figure below where the tachometer drives the non inverting input of the comparator up towards the preset reference […]
Read more
The following figure show us an alternative approach which gives proportional control. The charge pump integrator is shown in a feedback connection around the operational amplifier. For zero speed, the output voltage is equal to the reference voltage set up on the potentiometer on the non inverting input. The charge pump puts charge into capacitor C2 and causes the output […]
Read more
Variable reluctance magnetic is not derive all inputs. For example in spark ignition engines, the inputs are derived from the spark coil. Below is figure of an interface circuit for this situation. We can set up any number of cylinders using this tachometer by linking the appropriate timing resistor as illustrated. We can use a 500ohm trim resistor to set […]
Read more