Mar 29, 2020 #1 V VTI_16V Member level 1 Joined Nov 25, 2019 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 6 Activity points 386 Hello people . Can someone explain to me what is the purpose of this bc817 transistor in this buzzer circuit? Thanks a lot
Hello people . Can someone explain to me what is the purpose of this bc817 transistor in this buzzer circuit? Thanks a lot
Mar 29, 2020 #2 FvM Super Moderator Staff member Joined Jan 22, 2008 Messages 52,399 Helped 14,748 Reputation 29,778 Reaction score 14,091 Trophy points 1,393 Location Bochum, Germany Activity points 298,000 It's a current limiting circuit, but the selection of component values seems questionable.
Mar 29, 2020 #3 barry Advanced Member level 7 Joined Mar 31, 2005 Messages 6,333 Helped 1,194 Reputation 2,400 Reaction score 1,389 Trophy points 1,393 Location California, USA Activity points 34,476 It’s a current litter.
Mar 29, 2020 #4 V VTI_16V Member level 1 Joined Nov 25, 2019 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 6 Activity points 386 Can you explain me how this works? What i can see from this, when TR2 receives positive pulse it turns on and it connects ground to buzzer... What happens to TR1 and how it limits current, i dont get it ... Current through buzzer turns TR1 on?
Can you explain me how this works? What i can see from this, when TR2 receives positive pulse it turns on and it connects ground to buzzer... What happens to TR1 and how it limits current, i dont get it ... Current through buzzer turns TR1 on?
Mar 29, 2020 #5 Audioguru Advanced Member level 7 Joined Jan 19, 2008 Messages 9,457 Helped 2,151 Reputation 4,302 Reaction score 2,008 Trophy points 1,393 Location Toronto area of Canada Activity points 59,718 Current of the buzzer in the emitter resistors of TR2 turns on TR1 which reduces the base voltage if TR2 so that the buzzer current is limited.
Current of the buzzer in the emitter resistors of TR2 turns on TR1 which reduces the base voltage if TR2 so that the buzzer current is limited.
Mar 30, 2020 #6 V VTI_16V Member level 1 Joined Nov 25, 2019 Messages 38 Helped 0 Reputation 0 Reaction score 0 Trophy points 6 Activity points 386 i got it now, thank you