Voltage-ratio-to-frequency-converter


Posted on Jun 25, 2012

The circuit accepts two positive-voltage inputs VN and Vv and provides a TTL-compatible output pulse train whose repetition mte is proportional to the ratio VN/ V0. Full-scale output frequency is about 100 Hz, and linearity error is below 0.5 percent. The outputF, equals KVn/Vd, where K = 1/(4R2C1) provided R1 = R3. Op amp IC1A alternately integrates VN/2 and -VN/2, producing a sawtooth output that ramps between the Vv level and ground. When transistor Ql is on, for example, IC1A integrates -VN/2 until its output equals Vv.


Voltage-ratio-to-frequency-converter
Click here to download the full size of the above Circuit.

At that time, the IC1B comparator switches low, causing IClD"s bistable output to go low, which turns off Ql. !CIA"s output then ramps in the negative direction. When the output reaches 0 V, the IC1C comparator switches, Ql turns on, and the cycle repeats. Transistor Q2 converts the IC1D output to TTL-compatible output logic levels. Setting Vv to 1.00 V yields a linear voltage-to-frequency converter (F, = KVn), and setting Vn to 1.00 V yields a reciprocal voltage-to-frequency converter (F0=KVd).




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

White LED Drive Circuit
Phone line Audio Visual Ringer
Tv modulator
water level indicator using 7 segment display
theft preventer alarm circuit
12v Battery Charger Circuit with Auto Cut off
A Unipolar Stepper Motor Driver
Crystals
Simple bike computer tutorial
Using a real time clock with a microcontroller
555-channel temperature test circuits
Fade one lamp dimming switch circuit



Top