Assembly Hint; Figure 5-Applying Thermal Compound; Figure 6-Heatsink Installation - DYNACO PAT-5 Assembly Manual

Assembly Hint

You'll want to get the regulator or transistors leads bent so that when laying down, the
mounting holes line up well. To do this, I put the leads halfway into their mounting holes,
then slowly bend the regulator over into position while aiming the hole in the device for
the hole in the PCB. With a little care, you won't have to jimmy it very much at all to get
good registration.
Next, remove the device with the now pre-bent leads, and:
 Apply a thin film of thermal compound to the back TO-220 device just before
assembling it to the heat-sink and PCB.
 Fasten the regulator in place with the hardware as shown in Figure 4 and Figure 6.
 Make sure to put the correct regulator type or transistor at the indicated location.
 Solder the leads after the heatsink, power device, and mounting hardware are
secured in place. That keeps the power devices as cool as possible.
Desig- Type Description, Marking
nation
U1 TL783 High Voltage Positive Regulator, TL783. U1 gets one short
heatsink mounted on the component side of the board.
U2 TL783 High Voltage Positive Regulator, TL783. U2 gets one long
heatsink on the component side of the board, and one short
heatsink on the solder side of the board.
U3 LM7915 Negative 15V Regulator, LM7915. U3 gets one long
heatsink mounted on the component side of the board.
Q2 TIP32C PNP Power Transistor, TIP32C. Q2 gets one long heatsink
mounted on the component side of the board.
Before you solder, please double check that the correct part is in the correct location.

Figure 5-Applying thermal compound

TO-220 Packaged Devices

Figure 6-Heatsink Installation

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