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R. M. Marston (Auth.)'s 110 Semiconductor Projects for the Home Constructor PDF

By R. M. Marston (Auth.)

ISBN-10: 0408003227

ISBN-13: 9780408003223

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Example text

Fig. 29 shows a simple bistable m u l t i v i b r a t o r or m e m o r y u n i t . H e r e , either Q l is o n a n d Q2 is off, or vice versa. T h e state of t h e circuit can be c h a n g e d b y m o m e n t a r i l y shorting t h e base of t h e ' o n ' transistor t o g r o u n d . T h e circuit t h e n m a i n t a i n s this n e w state u n t i l t h e base of t h e n e w ' o n ' transistor is s h o r t e d t o g r o u n d . O u t p u t s can be t a k e n from either collector. A n y supply in t h e range 2 - 1 8 V m a y be used.

A n d a +ve bias h a s a similar effect in a p c h a n n e l device. T h e m a g n i t u d e o f V n e e d e d t o r e d u c e /

24 s h o w s h o w t h e circuit of Fig. 23 can be c o n v e r t e d t o a t i m e switch, for use as a p h o t o t i m e r , e t c . H e r e , R9-R10 a n d C are w i r e d x as a voltage divider n e t w o r k , so t h a t , w h e n t h e s u p p l y is c o n n e c t e d , 12V +Ve Fig. 24 Time switch 110 SEMICONDUCTOR PROJECTS 27 Q charges e x p o n e n t i a l l y w i t h a t i m e c o n s t a n t t h a t can be varied via Rio T h e rising e x p o n e n t i a l voltage is applied t o Q 4 base, a n d a p p e a r s at t h e j u n c t i o n of R a n d R x n at a r e d u c e d a m p l i t u d e , a n d is t h e n a p p l i e d t o t h e base of Q l via R .

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


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