Lancaster, Don. <br/><br/>
Don Lancaster's active-filter cookbook /  Don Lancaster. 

 - 2nd ed. 
 - Oxford :  Newnes,  1996. 
 - 240 p. :  ill. ;  22 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>075062986X (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric filters, Active.