Ramsey Electronics CT255 manual

Page 20

ˆ16. Install C2, 10 uF electrolytic capacitor. Remember to observe polarity with electrolytic capacitors! Check the parts placement diagram for correct orientation.

ˆ17. Install R34, 10K ohm (brown-black-orange).

ˆ18. Install R30, 10K ohm (brown-black-orange).

ˆ19. Install R4, 10K ohm (brown-black-orange).

ˆ20. Install R2, 10K ohm (brown-black-orange).

ˆ21. Install C1, 1 uF electrolytic capacitor. Remember to observe correct polarity!

ˆ22. Install R1, 47K ohm (yellow-violet-orange).

ˆ23. Install R15, 100K ohm (brown-black-yellow).

ˆ24. Install C6, .1 µF disc capacitor (marked 104 or .1). Disc capacitors are not polarized, so either direction is fine.

ˆ25. Install R39, 1K ohm (brown-black-red).

ˆ26. Install R37, a precision 1K ohm (brown-black-black-brown-brown).

ˆ27. Install headers H2 and H1 by slipping the protruding pins on the short side through the circuit board and soldering. Solder all three pins.

ˆ28. Install C3, .1 µF disc capacitor (marked 104 or .1).

ˆ29. Install R31, a precision 4.22K ohm (yellow-red-red-brown-brown).

ˆ30. Install R27, a precision 1.43K ohm (brown-yellow-orange-brown- brown).

ˆ31. Install R40, the last 10K ohm (brown-black orange).

ˆ32. Install R23, a precision 1.82K ohm (brown-gray-red-brown-brown- brown).

ˆ33. Install R22, a precision 10K ohm (brown-black-black-red).

ˆ34. Install C5, .1 µF disc capacitor (marked 104 or .1).

Whew! That was some work. But we’re almost done and some decisions need to be made before continuing. It’s a good time now to re-check all your work up to this point. Carefully inspect the circuit board for stray leads or open solder connections, trim and touch up any that need work.

Next, while we are at our best, we will install the LED segments for the display. (L)ight (E)mitting (D)iodes are just that, a diode junction that emits light of a particular wavelength when forward biased, so pay attention to the polarity of the diodes as shown in the parts placement diagram. Remember that this will be the most observed part of the entire kit, so take your time and

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Contents Computemp 255 Binary Thermometer KIT Ramsey Transmitter Kits KIT Assembly CB B OA RD in CA SE IntroductionCircuit Description Binary counterScaling to Celsius DAC Digital to Analog ConverterADC Analog to Digital Converter? In a sense… More on the ADC Oh that extra countFor the complicated Fahrenheit design How the counter oscillator worksRestarting the conversion cycle CT255 Binary math Bit # Value 128 Some random parts, and what they do CT255 Schematic Diagram CT255 Parts Layout Diagram Parts Supplied with Your CT255 KIT CapacitorsResistors SemiconductorsRamsey LEARN-AS-YOU-BUILD KIT Assembly Enough of that ... let’s get started CT255 Thermometer Assembly Instructions CT255 CT255 CT255 Front View LM35DZ Assembly Instructions for Custom Case CongratulationsUSE of Your Computemp Troubleshooting Guide Still Having TROUBLE?Conclusion Ramsey Kit Warranty Required Tools Additional Suggested ItemsRamsey ELECTRONICS, INC Fishers Station Drive Victor, New York Phone 585
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