Circuit Design Lab & Substitution Set Tester
130MM cases
Link to Design
Look for IEC WIth Switch
Velcro for Meters (use cable velcro
Look in truck
Power Supply design.
Banana jacks no metal outside type.
Full wave bridge in black metal box
How to attach leads to electrolytics
Reforming Capacitors
Power Supply Schematic
More Info 
Adafruit
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Resistor Sub
Capacitor Sub
Power Supply
Ac Power
Potentiometers
Harbor Freight Case
Plexiglass Panel
Signal Generator
Option for using Bench Test Equipment
BNC Outs
Stereo Capable
Perf Board Section for Heavier Components
Oscilloscope
Volt Meters
Current Meters
Build In sections.
Re-Arrangeable.