Sceadwian Banned Apr 4, 2009 #21 Depends on the transistor. You can use high voltage transistors but this is more expensive than simply using a diode.
Depends on the transistor. You can use high voltage transistors but this is more expensive than simply using a diode.
MrDEB Well-Known Member Apr 5, 2009 #22 wheres the diode across the solenoid? if that is a solenoid? would think that a reverse diode is needed? he mentions a motor?? but the solenoid coil needs one. and why the two transistors? would not just one work I just had to ask
wheres the diode across the solenoid? if that is a solenoid? would think that a reverse diode is needed? he mentions a motor?? but the solenoid coil needs one. and why the two transistors? would not just one work I just had to ask
F flat5 Member Apr 5, 2009 #23 Two transistors because 1) a high impedance is needed at the input (to the transistors) to not load the PIC and to charge the cap 2) provide enough gain to saturate the second transistor
Two transistors because 1) a high impedance is needed at the input (to the transistors) to not load the PIC and to charge the cap 2) provide enough gain to saturate the second transistor