A
Abstract Dissonance
- Jan 1, 1970
- 0
I'm wondering why I can't get a multitude of voltage's out of just a single
transformer?
I want to be able to have several DC power supply levels out of my power
supply for miscellaneous uses... such as +Variable, -Variable, +5, -5,
+12, -12, etc.. (where each one is a distinct power output of the power
supply.
Why can't I just take different combinations off my center tapped
transformer's filter caps as
-----(+)------ A
|
---
---
|
GND B
|
---
---
|
-----(-)----- C
So I should be able to get A-B, A - C, C-B and C - A for use in my different
regulators(+ and - variables and fixed)?
i.e., lets say I have it as such
-----(+)------ 12V
|
---
---
|
GND 0
|
---
---
|
-----(-)----- -12V
then if I want 24 volts I just treat the (-) as ground into my + voltage
regulator, if I want -24 I treat the +24V into my + voltage regulator?
I mean, since potential different is relative then it shouldn't matter?
One more thing: lets say I have a power supply that has a gnd and +V volt
hook up... why can't I just treat the GND as -V and the +V and GND to get
a -V and GND hook up? (I have a feeling this has to do with the regulator
not being able to "work backwards" but I'm still not convinced why it won't
work?) After all, its just like you turned the external circuit "around"
(i.e., connected it backwards but everything should work "normal"?
Maybe to be more clear just incase I'm not understanding something, lets
suppose I have a circuit that requires -12V input w.r.t. its Ground(say its
a pic or something)... but I only have a power supply that supplies 12V...
why can't I use that same power supply to directly power the circuit by just
swaping the connections?
Thanks,
Jon
transformer?
I want to be able to have several DC power supply levels out of my power
supply for miscellaneous uses... such as +Variable, -Variable, +5, -5,
+12, -12, etc.. (where each one is a distinct power output of the power
supply.
Why can't I just take different combinations off my center tapped
transformer's filter caps as
-----(+)------ A
|
---
---
|
GND B
|
---
---
|
-----(-)----- C
So I should be able to get A-B, A - C, C-B and C - A for use in my different
regulators(+ and - variables and fixed)?
i.e., lets say I have it as such
-----(+)------ 12V
|
---
---
|
GND 0
|
---
---
|
-----(-)----- -12V
then if I want 24 volts I just treat the (-) as ground into my + voltage
regulator, if I want -24 I treat the +24V into my + voltage regulator?
I mean, since potential different is relative then it shouldn't matter?
One more thing: lets say I have a power supply that has a gnd and +V volt
hook up... why can't I just treat the GND as -V and the +V and GND to get
a -V and GND hook up? (I have a feeling this has to do with the regulator
not being able to "work backwards" but I'm still not convinced why it won't
work?) After all, its just like you turned the external circuit "around"
(i.e., connected it backwards but everything should work "normal"?
Maybe to be more clear just incase I'm not understanding something, lets
suppose I have a circuit that requires -12V input w.r.t. its Ground(say its
a pic or something)... but I only have a power supply that supplies 12V...
why can't I use that same power supply to directly power the circuit by just
swaping the connections?
Thanks,
Jon