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STEPPING-SWITCH POSITION INDICATOR


2N1728
Transistor Q generates positive output pulse when input pulse is applied or removed. To obtain such positive pulses when stepping switch of automatic test set reaches positions 1, 3, 4, 5, 8, and 10, contacts ore connected to -10 V. Transfer for contact 1 to 2 then gives no output pulse, but moving from 2 to 3 removes input pulse and thus gives deisired output pulse. Operation depends on under clamped oscillation in unloaded R-L-C ' circuit, with only one negative oscillation because saturated transistor shunts tuned network.-R. J. Bouchard, Positive. Pulse Gen. orator, Electronics, 37:21, p 74-75.
               
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