Pages: 1 [2]   Go Down
Author Topic: PNP Transistor not 'shutting off' when increasing voltage.  (Read 1618 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
My initial setup was:
...
What i understood you meant was:

They will never work.
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 90
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
My initial setup was:
...
What i understood you meant was:

They will never work.


Could you explain what you mean by that..?
Logged

Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 626
Posts: 34210
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
What i understood you meant was:
Yes I thought you were not getting it.
Try the attached diagram.

As for dhenery, sorry about him but he has poped up recently and is giving a lot of bad advice.

* High side switching.pdf (15.16 KB - downloaded 26 times.)
Logged

Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

To switch off a bjt, you have to bring its base to within 0.6v of its emitter. That means your pnp's base has to be least 11.4v or more.
Logged

Pages: 1 [2]   Go Up
Jump to: