On 04/07/2016 2:18 PM, Bill Sudbrink wrote:
drlegendre wrote:
Not saying it's going to smoke-out, but it does
seem like a wonky thing to do.
I disagree about "wonky" let me try with more
diagram and less English:
(+8)
|
VIN| ceramic cap
|-----][-----
___|____ |
| 7805 |----------GROUND
-------- |
| |
VOUT|(+5) |
| |
___|____ |
| LOAD |-------|
--------
+8 is not currently available (no pun intended).
I would like to test LOAD without removing 7805
as it is soldered in place. Is damage to 7805
likely if alternative regulated current is applied
at (+5) and (+8) is left open?
Bill S.
Yes, you can damage the 7805 - READ the data sheets...
Raising the Output Voltage above the Input Voltage:
Since the output of the device does not sink current, forcing
LM340/LM78MXX Series 3-Terminal Positive Regulators LM340/LM78MXX Series
3-Terminal Positive Regulators
the output high can cause damage to internal low current paths in a
manner similar to that just described in the “Short- ing the Regulator
Input” section.
LM340/LM78MXX Series 3-Terminal Positive Regulato John :-#(#
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