Penfold, R. A. <br/><br/>
Popular electronic circuits /  [Book]. 
by R.A. Penfold. Bk.1. 
 - London :   Bernard Babani (publishing) Ltd,   1980 
 - 149p. :   ill. ;   18cm. 
<br/><br/><label>ISBN: </label>0859340554 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic circuits.