Phone Circuits

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Fridge Alarm with 4060
Light Control System (OP295)
Headphone electrostatic JFET Amplifier
Touch Switch Circuit with explnation
audio-video modulator circuit
simple fire alarm circuit
IR Headset Circuit with headphone Transmitter and Receiver diagram
Music Bell with In / Out Indicator
Description of an active reversible in-phase/quadrature modulator carrying out frequency UDC
Telephone Circuits