D/A converter for motor control

NNW 101 D/A converter formotor control In many instances, it is quite sufficient to control motors with an on/off type action. However, if a more "linear" control is required, the circuit given here may prove useful. The four bit magnitude comparator (4063) inputs are EX-ORed and fed to a resistive divider chain to provide an output voltage which is proportional to the difference of the comparator input values (with an accuracy of four bits). These values can be derived, for instance, from a binary counter. The outputs of the comparattor (A > B, A --- B, DATA • ••• ft !j"i—sYst ! A < B) can be used to (indirectly) turn the motor of circuitry can be applied where varicaP control is not adequate, such as for remote antenna tuning or phase-noise free VCOs. olarity of the supply voltage in the case of DC motors. This kind on or off and/or to reverse the p A,BA11 A2 A3 A4 } IN 4063 A=cs MSB LSB 11111E"s"" III I oI . 1 B2 B3 84 111.0.11 "1 I I BINARY COUNTER U f syst 81522.......