23. Install R8, a 4.7K ohm resistor
24. Install Q4, a 2N3904 transistor (marked 3904). This transistor is used to amplify the small amount of current provided from the IR detector to a large enough amount to drive the LED indicator. The LED will blink OFF when a signal is seen, so it has a dual use of indicating power as well.
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know that and IR signal has been seen and is being
26. Install R7, a 220 ohm resistor
27. Install C9, a 10 uF electrolytic capacitor (small cylindrical component coated with plastic and marked 10). Electrolytic capacitors are polarized with a (+) and
Ordinarily, only the negative side is marked on the capacitor body with a dark band and the
28. Install VR1, the 78L05 voltage regulator. Make sure the flat side of this component is in the same orientation as shown on the silk screen and Parts Layout Diagram. This part works by “smoothing” out any ripple that may reside on the
29. Install D2, the large 1N4002 regulator diode. If you are using an AC power supply, this diode helps to convert the AC source voltage to pulsed DC. C10 (which we install last for mechanical reasons) accumulates the pulsed DC and smoothes it out so that regulator VR1 can process it the rest of the way and provide us with a clean power source. If a DC power source is used, the diode provides you with reverse power protection should the supply not be setup with a positive tip like it should.
30. Install S1, the power switch. Solder one pin and make sure the switch
RRW1A • 12