Optical Sensing Circuits

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Doorbell light for the Deaf
Temperature Fan controller
Schmitt trigger comparator
Voltage Level Indicators for battery Using LM324
Whats the third wire on a piezo buzzer
simple microphone preamplifier
2 transistor fm voice transmitter
Enhanced 5 Digit Alarm Keypad
easy and cheap cdv 700 tube adapter
VHF Twist-Shift Keying Rotation-Shift Keying Orthogonal BPSK Twist Modulation Motorola SyntorX
antenna tuner circuits
Complementary symmetry push-pull circuit