View previous topic :: View next topic |
Author |
Message |
rich77777 Guest
|
Posted: Tue Jun 19, 2007 3:46 am Post subject: Voltage drop across resistor in series with zener diode |
|
|
how do i find this? i thought i would take the 22v source and just subtract the 0.7v that the diode takes.
but i am wrong, please help me!! |
|
Back to top |
|
|
vtech
Joined: 08 May 2006 Posts: 1264 Location: USA
|
Posted: Tue Jun 19, 2007 4:42 am Post subject: |
|
|
The .7v drop across a standard silicon junction is correct, however a zener diode behaves as an open circuit until reaching it's rating & acts like a voltage regulator/crowbar during it's avalanch mode. In other words the voltage drop across a Zener diode will equal to whatever it's rated when "zenering" ---NOT .7v as in a regular diode.
Purpose of the resistor is to limit the current through the zener during it's breakdown voltage region.
Here's a detailed example;
http://www.allaboutcircuits.com/vol_3/chpt_3/9.html |
|
Back to top |
|
|
|
|
|
You can post new topics in this forum You can reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
|
eServiceInfo on FB -
Service Manuals Free Download -
Service Diagrams
Free TV Schematics Download -
HARDW.net -
Pinout Master -
Jabse Service Manual Search -
Jabse.InK -
onTap.bg
SnimkiOt.com -
Poblizo.com : пътешествия
Latest Service Manuals :
[snap-in] RTB Series Richey • Panel CMO N170C2-L01 1 [DS] . Various • KM1530 2030 C-Errors Kyocera • GA34-0851-0 4956 Processor Model K00 Des • Panel IDTech IAUX14K 0 [DS] . Various • RRV4594 - VSX-830-K,VSX-45,VSX-830-S Pio • DCR-TRV738E-TRV740E-TRV840-L3 Sony • SW105, SW205 Pioneer • NHM5-024 NOKIA • 22gr804 Philips •
|