Højtaler-beskyttelse for K3503
Prevent any annoying plop occurring in speakers when switching the K3503 car booster on and off. In addition, it provides protection for the MOSFET transistors and the car battery (monitoring the voltage drop). The entire circuit can be built into the car booster housing.
soft start of the switched mode power supply
switch-on delay of the speakers: ± 2 seconds
immediate switch-off of the speakers when switching off the booster
voltage monitor: switch off at +/- 10V
only suitable for VELLEMAN K3503 2 X 100W car booster
PCB dimensions: 57 x 51mm (2.2" x 2.0")
Extra Info - Hints
When protection works to early due to voltage drop of the battery, please change ZD1 and ZD2 by 9.1 or 8.2V type.
When the power supply is not stable, change C5 and C6 by 47µF.