By R. M. Marston (Auth.)
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Extra resources for 110 Semiconductor Projects for the Home Constructor
Simple c o m m o n source amplifiers Fig. t. as a simple c o m m o n source amplifier. In Fig. 6a a self-biasing s y s t e m is u s e d , a n d t h e 12V TO isV+ve C 3 16/iF "—Dl—•OUT "I Fig. 6 V is d e v e l o p e d across R . 2 Fig. 6a s h o w s t h e off-set gate biasing version of t h e same circuit. In t h i s case, t h e s u p p l y range is l i m i t e d t o b e t w e e n 18 a n d 2 0 V ; / ^ is 18V TO 20 V + V C Fig. 2Mall 50 pF fR = 15Hz-250kHz±3dB a p p r o x i m a t e l y 1 m A . In b o t h of these circuits, t h e source is d e c o u p l e d t o g r o u n d via C at signal frequencies.
With t h e c o m p o n e n t values s h o w n , t h e frequency range of t h e circuit is variable from a b o u t 25 H z - 3 k H z via R . T h e o p e r a t i n g x frequency can be varied from less than o n e cycle per m i n u t e t o over 100 k H z b y changing t h e Ci value. Linear saw-tooth generator T h e ' s a w - t o o t h ' at t h e e m i t t e r of t h e basic u . j . oscillator is of e x p o nential f o r m . In some applications, h o w e v e r , a perfectly linear sawt o o t h is r e q u i r e d , a n d this can be o b t a i n e d b y charging t h e m a i n t i m i n g capacitor from a c o n s t a n t c u r r e n t source, as s h o w n in Fig.
T. d a t a sheets either in t e r m s of m m h o s (milli-mhos) or /xmhos ( m i c r o - m h o s ) ; t h u s , a g m of 5 m A / V = 5 m m h o = 5,000 //mho. t. t. for e x p e r i m e n t a l w o r k , a n d t h e n go o n t o consider a few practical circuits in w h i c h it can be used. t. h a s b e e n selected for this p u r p o s e , a n d Fig. T. ~ +=25 V (= max drain-to-source voltage). += 25 V (= max drain-to-gate voltage). - 25 V (= max gate-to-source voltage). = = - 8V m x (= a gate-to-source voltage needed to cut off/^).