±15V Fixed Power Supply
For my Extron Composite Video 8x8 Matrix Switcher in my Home A/V System

Devin R. Ott
Designed & Constructed – August 2013

Description:

Utilizes two ungrounded +18V @ 2.75A switching power supplies (salvaged from my company’s warehouse) as input voltage sources, referenced above and below earth ground to feed the positive and negative linear regulators.

This is a very standard circuit I designed, tested, assembled, and installed in a single weekend to restore operation to the 8x8 composite video matrix switcher I integrated into my centralized apartment A/V system. This unit handles video switching for all DVD players/recorders, security camera feeds, low-res cable tuner feeds (for touch panel preview), and play station in my apartment.

Schematic:

Click HERE for complete design notes [PDF]

Final Assembly:

Dual +18V, 2.75A ungrounded switching DC power supplies provide the 18V input (referenced above & below chassis ground) to the
linear IC voltage regulators. Also provide non-conducting mounting surface for the ±15V power supply assembly.

Final Installation:

Red LEDs provide convenient at-a-glance verification of output voltage from linear regulators.

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