May 15th, 2018, 3:04
May 15th, 2018, 4:13
fzabkar wrote:mad4hdd wrote:Its good idea ..... . he can also add a resistor (limiter) +5 to Gate.
The logic board drives the power board directly, without limiting resistors. ISTM that R5 and R7 are sufficiently large so as to limit the base current into Q3 and Q6.
May 15th, 2018, 4:39
+5V +12V +5V
+ + +
| | |
.-. .-. |
R1/R?? | | | | R2/R9 |
| | | | |
'-' '-' |
| | G | D
+----. +-----------||-+ Q1/Q7
| | | ||<- IRFR4105
Q3/Q9 | | | Q2/Q8 ||-+
SATA/IDE ___ |/ | |/ | S F1/F3
power o---|___|---| '---| | _
on/off |> |> '----o_/ \o---o +5V output
from R5/R10 | |
logic | | poly- o
PCB | | switch |
=== === ===
GND GND GND
May 15th, 2018, 5:20
May 15th, 2018, 14:44
May 15th, 2018, 15:43
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