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ECE480 Circuit Survival kit
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Circuits: + Survival Kit  +
Convert that 12 Volt "Brick" plugged 
in the wall to a ± 6-Volt Dual Supply
HV Power Supply Power your Favorite Geiger Counter 
or Scintillation Counter.
Voltage to Frequency Convertor  
Transistor Relay Driver Prevent Premature Transistor Death 
in your Relay Driver Circuits.
Filter Collection  
2 Wire to 4 Wire Hybrid How Do they get Two Voices on only Two Wires? 
& How Do they Separate Them?
A.M. Transmitter AM Transmitter using only One HEX Inverter IC
A.M. DSB Modulator Diode Balanced Modulator
H-Bridge W/Power MOSFETS  
PIN Photo Detector Circuit  
Wet Basement Sensor Device will close relay contacts to let you know: 
when you're in over your head  Blub Blub...
Piezo Sounder Detection Circuit This circuit helps interface a louder Alarm to existing alarm systems.
Cold Temperature Alarm Circuit to detect a preset temperature: relay contact closure.
Voltage Changer Circuit for Automotive use: Battery to 5 Volts.  With protection diodes.