Download e-book for iPad: 110 Semiconductor Projects for the Home Constructor by R. M. Marston (Auth.)

By R. M. Marston (Auth.)

ISBN-10: 0408003227

ISBN-13: 9780408003223

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Extra info for 110 Semiconductor Projects for the Home Constructor

Example text

A n d Ql-R R Rs r s act as a bridge circuit, a n d Rs is adjusted so t h a t , in t h e absence of an i n p u t voltage at Ql g a t e , t h e voltage o n Ql source is e q u a l t o t h a t o n R slider, so t h e bridge is b a l a n c e d a n d z e r o s c u r r e n t flows in t h e m e t e r . A n y p o t e n t i a l applied to Ql gate t h e n causes t h e bridge t o go o u t of balance b y an a m o u n t p r o p o r t i o n a l t o t h e i n p u t voltage, w h i c h can t h e n be read directly o n t h e m e t e r .

Alternative n e t w o r k s can be used if preferred, b u t close tolerance c o m p o n e n t s should be u s e d if g o o d accuracy is r e q u i r e d . ^ acts as a safety resistor, a n d p r e v e n t s damage 4 t o Ql gate in t h e event of excessive i n p u t voltages being c o n n e c t e d . In u s e , / ? is first adjusted so t h a t t h e m e t e r reads z e r o in t h e absence 8 of an i n p u t voltage. 5 V is t h e n c o n n e c t e d t o t h e g a t e , a n d R is adjusted t o give a full scale deflection 6 o n t h e m e t e r .

5 V is applied t o Q l b a s e , so, w i t h n o i n p u t signal c o n n e c t e d , Q l , Q2 a n d t h e relay are off. c. plus a x . signal is a p p l i e d t o Q2 b a s e , a n d t h a t transistor is driven o n . As Q2 is driven o n , its collector m o v e s t o w a r d s +ve line p o t e n t i a l , a n d t h e relay is driven o n . When t h e —ve going p a r t s of t h e i n p u t w a v e f o r m are a p p l i e d t o Ql b a s e , Ql c u t s off, b u t base c u r r e n t c o n t i n u e s t o flow in Q2 via C , so Q2 a n d t h e relay stay o n .

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110 Semiconductor Projects for the Home Constructor by R. M. Marston (Auth.)


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