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If the Lazer power supply is the same as the Crusader, you would open the line here where the transformer winding feeds the 100uF electrolytics and connect the NO contact of the relay between the winding and the caps.
A 3-5 amp relay would be fine and you could even use 2 poles it it's DPDT to share the load. You can make the relay last longer by putting a .01uF 1KV - 3KV disc cap across the relay to debounce the contacts.
Even though this is a high voltage supply, there is only about 300 VAC here and is easier to switch than 900 Volts DC.

[QUOTE="DoctorAudio, post: 752610, member: 10801"] If the Lazer power supply is the same as the Crusader, you would open the line here where the transformer winding feeds the 100uF electrolytics and connect the NO contact of the relay between the winding and the caps. [IMG]https://i.imgur.com/PTG4nmH.jpg[/IMG] A 3-5 amp relay would be fine and you could even use 2 poles it it's DPDT to share the load. You can make the relay last longer by putting a .01uF 1KV - 3KV disc cap across the relay to debounce the contacts. Even though this is a high voltage supply, there is only about 300 VAC here and is easier to switch than 900 Volts DC. [/QUOTE]

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