Using the CA3164A BiMOS control chip consumes less than 15 pA during standby, yet it can provide 100 mA of chopped current to the de-to-de converter during the energy-reservoir charging cycle. The CA3164A drives tbe primary of T1 with symmetrically chopped current at a 400 to 2000 Hz rate. The CA3164Ns chopper frequency is about 500Hz;
Electronic-photoflash - schematic

the duty cycle, 50% when R7 is 3.1 4 K!l.

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