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Standard construction techniques may be used for this circuit and a printed circuit board is available if desired. The prototype was point-to-point wired on a Radio Shack prototype PCB (part # 276-168B).

If building the TEMP05 from the PCB, refer to Figure 3 for component placement. Begin by inserting IC sockets (highly recommended). Follow this with the insertion of all passive components. I like to proceed by inserting all resistors, then all capacitors. Watch the polarity of the electrolytic capacitors. The positive lead of the electrolytics is the square pad for that component.

There are only 3 types of resistors; 10K, 1.5K and 10M. The color codes for these are shown in Table 1.  Insert the resistors where shown in Figure 3.

Resistor Color Codes

Value

1st Stripe

2nd Stripe

3rd Stripe

4th Stripe (Tolerance)

1.5K

Brown

Green

Red

Gold

10K

Brown

Black

Orange

Gold

10M

Brown

Black

Green

Gold

Table 1. Resistor Color Codes

TEMP05 layout

Figure 3 Parts Placement

Next, insert voltage regulator U3 and full-wave bridge D1. At this time, you should also insert terminal strip J1. Once that is done, put down the soldering iron and get out a suitable power supply (most any 12 volt "wall-wart" will do). Connect the power supply to the terminals of J1 (polarity is not important, even if the power supply is DC instead of AC; the full-wave bridge will take care of the polarity). Power up and then measure voltages between pins 40 and 20 of IC U1. Pin 40 should be +5 volts while pin 20 is ground. If you are wiring this circuit on your own board, then check polarity on the other IC sockets as well. Table 2 shows the voltages required on each IC.

Table 2. Power and Ground Table

IC

+5Volt

Ground

U1

40

20

U2

8

5

U4

7

6,9

Turn off the power and get back your soldering iron. To finish up, insert the crystal, the LED and the remaining connectors. The flat side of the LED should be lined up with the square pad for it.

An optional DS18S20 can be installed at this time in the location provided.

You are now ready to prove in the circuit.


Introduction  News Version 5 Upgrade Description  Schematic  Construction  Testing  Instructions Software Vintages References  Ordering Info Download the Instruction Manual Here HomeSeer Setup


Last Updated January 04, 2014

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