| Author | Message | ||
     Roman Dubravsky Rating: N/A |
Hello, As I'm thinkig about it, higher values of resistors in voltage divider (R8, R9 and aperture measuring chain) can cause one failure which occurs relatively often in last Electros. It is unstability or malfunction of metering when light is low and aperture is high. Voltage divider with higher values of resistors is "weak". If Tr2 have low empowering coefficient, its base current (emmitor current of Tr1) changes relations into voltage divider, voltage on base go down, base current is insufficient, Tr2 never close, shutter stay opened. Can my idea be right? |