| ??? 08/21/09 20:58 Read: times |
#168451 - PNP SWITCH |
GREETINGS.
An alarm clock 8051 will switch on the external alarm(9 to 12 volts @100mA) by making a port pin low for say 3 seconds.The alarm,when on,will latch the switch,by a normallty high port pin,till user puts off by the push to off switch. I have the schematic here. http://www.8052.com/users/Aso...SWITCH.gif Can somebody complete/correct it? Possibly MJK or Kai who had earlier contributed to similar question on relays? BC369 VCE(sat) {@Ic=1.0A,Ib=100mA} = 0.5V BC557 VCE(sat) {@Ic=-100mA,Ib=-5mA} =-90 to 270 mV VBE(on) {@Ic=-100mA,Ib=-5mA} = 900 mV Best Regards |
| Topic | Author | Date |
| PNP SWITCH | 01/01/70 00:00 | |
| I would use a PMOSFET | 01/01/70 00:00 | |
| MOSFETS | 01/01/70 00:00 | |
| MOSFETs help to save supply current | 01/01/70 00:00 | |
stock depleted :-) | 01/01/70 00:00 |