C1C3C2 C4C5C6 U2 R1 D1 DIP Socket Notch U1: 555 Timer IC Dimple Pin 1 Flat Side Up U3: RF Transmitter 5-Volt Regulator 10K Ohm Thermistor Printed Circuit Board (PCB) 47 micro-Farad Electrolytic Capacitors Longer Lead Light Emitting Diode (LED) 0.1 micro-Farad Capacitors + - Black BandD1 - Diode + - B1: 9-Volt Battery Pins: Antenna Wires Battery Snap Connector + - Red Lead is Positive R4: 100 Ohm R2: 3300 Ohm R3: 680 Ohm Brown-Black-Brown-Gold Orange-Orange-Orange-Gold Blue-Gray-Brown-Gold
Prototype Area ThermistorTest Points Dipole Antenna RF Transmitter Timing Capacitor 5-Volt Regulator 555 Timer IC Protection Diode LED and current limiting resistor 9-Volt Battery Leads Decoupling Capacitors Expansion Port