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V o l t a g e d r o p a c r o s s R2 a l s o i n c r e a s e s until a point is r e a c h e d w h e r e even t h e l o w e s t level of t h e waveform e x c e e d s t h e low t h r e s h o l d of t h e S c h m i t t trigger; t h e amplifier c e a s e s t o o p e r a t e and no s p a r k s a r e generated. CI a l s o affords s o m e RF filtering, but it might b e surprising t o learn t h a t t h e input leads a r e r a r e l y s c r e e n e d . T h e s e n s o r coil is of s u c h low i m p e d a n c e t h a t this is u n n e c e s s a r y and in any c a s e s i n c e b o t h t h e s e wires a r e run t o g e t h e r as a pair, any e x t e r n a l l y i n d u c e d c u r r e n t will b e e q u a l l y p r e s e n t in b o t h , c a n c e l l i n g e a c h o t h e r out.

T o 6 8 0 V (within t h e maximum V c e of T R 3 ) on t h e i r own, but in r e a l i t y t h e y a r e u n a b l e to c o p e . C o n s e q u e n t l y t h e y h a v e t o a c h i e v e t h e d e s i r e d o b j e c t i v e b y t h e a l t e r n a t i v e m e a n s of providing f e e d b a c k to T R 3 b a s e and letting T R 3 do t h e actual limiting i n s t e a d . f. value falls b e l o w t h i s level b e f o r e s w i t c h i n g off p r o p e r l y . R e v e r s e b l o c k i n g diode D2 d e t o u r s t h e c u r r e n t from SR2 to T R 3 b a s e s o that it d o e s n ' t go s t r a i g h t to ground via T R 2 .

6 A and d i s s i p a t i n g 28 watts; has to b e r e m o v e d from t h e r e s t of t h e amplifier t o avoid c o o k i n g it to death, and b e provided with its own heatsink! 2 Ω c o m p o n e n t , t h e r e s i s t o r is of t h e high power, metal e n c a p s u l a t e d t y p e ( s e e t h e r e s i s t o r s s e c t i o n of Maplin's c a t a l o g u e for e x a m p l e s ) and is s c r e w e d t o t h e o u t s i d e s u r f a c e of t h e amplifier's die-cast c a s e . In c o m p a r i s o n t h e power dissipation of t h e actual switching t r a n s i s t o r is not v e r y much at all, which s e e m s almost p e r v e r s e .

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