By R. M. Marston (Auth.)
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Extra resources for 110 Semiconductor Projects for the Home Constructor
T. is c o n n e c t e d directly t o t h e e m i t t e r of a t h i r d transistor, Q3, w h i c h is wired as a c o m m o n base amplifier. t. is c o n c e r n e d , t h e e m i t t e r of Q3 a p p e a r s as a very low i m p e d a n c e drain load, w h i c h effectively couples t h e drain t o I8V TO 24V +Ve OUT Fig. s gate-to-drain capacitance as a result of t h e Miller effect. Ql therefore exhibits a fairly l o w value of i n p u t s h u n t c a p a c i t a n c e . A l t h o u g h only negligible voltage amplification t a k e s place b e t w e e n t h e gate a n d drain, c u r r e n t amplification takes place in t h e n o r m a l w a y , a n d t h e drain signal c u r r e n t s are fed directly i n t o t h e e m i t t e r of t h e c o m m o n base amplifier, Q3, w h i c h uses collector load R .
In this their I^ ss values m a t c h e d w i t h i n 10%. T h e circuit s u p p l y in t h e range 12-18 V, a n d t h e setting u p t h a t described for t h e Fig. 9 circuit. Very l o w frequency astable multivibrator Fig. t. astable or free-running m u l t i v i b r a t o r . T h e o n a n d off p e r i o d s of t h e circuit are c o n t r o l l e d b y t h e t i m e c o n s t a n t s Ci~R a n d C -R \ because of t h e ultra- 4 2 3 48 15 FIELD-EFFECT TRANSISTOR PROJECTS Fig. t. voltmeter. Ql and 2 must have l^ values matched ss within 10% 9VT0 12V + V e l 1 ov Fig.
1 sec//xF value of C This delay can be increased, if r e q u i r e d , b y increasing t h e value h of Ri or r e d u c i n g t h e value of R . 5 t o 1 0 sec via R , a n d w i t h a value of 1,000 iiF 10 it can be varied f r o m a b o u t 5 sec t o r o u g h l y 1 0 0 sec. C. operated switch A different t y p e of e l e c t r o n i c switch is s h o w n in Fig. 25. c. i n p u t w i t h an a m p l i t u d e greater t h a n a b o u t 100 m V is applied t o Q l base. T h e i n p u t i m p e d a n c e of t h e circuit r >i m > S 12V +Ve Fig.
110 Semiconductor Projects for the Home Constructor by R. M. Marston (Auth.)