Hey everybody, this is my first post on any forum
I want to share my last project on Maho with you, it is power supply. As we all know most common thing to die on Philips 432 is power supply and spare on is really expensive.
So we have +-15V (for creating +-9V for drives), 12V for Video and measuring system, 5V for all electronic, 5V from battery and 24V for relays.
Perfect candidate for all of this was PC power supply, 12V can be used for 15V, 12V and 24V.
Biggest problem was saving parameters for that is comes RESET signal, on power up reset signal is delayed approximately 200ms, but most important thing is when powering down reset signal shut down first than 5V.
For that i used one time delay relay for reset signal and capacitor on 5V line. Relay is directly connected to 220V and have 0.5s delay on power up, capacitor hold voltage just enough for Reset signal disappear before 5V.
Battery charger is used from original Philips power supply.
Fourth picture is original capacitor from original power supply, same is used.
Fifth picture 5V and reset power on.
Sixth picture reset and 5V power off.
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