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Audio detector with headphones Electromagnet coil from relay or solenoid What is needed for an electromagnet coil is a coil with many turns of wire, so as to produce the most voltage possible from induction with stray magnetic fields? The coil taken from an old relay or solenoid works well for this. DC108 datasheet, cross reference, circuit and application notes in pdf format. Features, Applications: NPN Silicon Planar Epitaxial Transistors. Suitable for applications requiring low noise and good hFE linearity, eg.
audio pre- amplifiers, and instrumentation. Functions instructions Door chime operation Press the push button on the bell push unit once, a wireless signal is sent to the receiver which will sound.