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Although Project Horizon runs at a generally safe 48VDC, Injury from improper assembly is quite possible. The main danger
comes from installing the polarized capacitors backwards as they can only be installed in one direction much like a battery
(more detail on capacitor installation comes later in this manual) If a capacitor is installed backwards, it may burst resulti ng
in burns or eye injury. If you are not experienced in electronics or electronic kit assembly, it would be wise to have an
experienced electronics person review your work before powering the unit on. Upon first power up, wear eye
protection and be wary of any burning smells or electrical noises such as loud pops or buzzes. If you followed this
installation guide properly and all components are in their proper places and were installed in their proper orientation, you
will soon be enjoying your amplifier without issue!
GARAGE1217.COM IS NOT RESPONSIBLE OR LIABLE FOR INJURY, PROPERTY LOSS OR DAMAGE AS THE RESULT OF ASSEMBLY OR USE OF THIS "DO IT YOURSELF" KIT. PRO JECT
HORIZON IS CONSIDERED A HOBBY LEVEL PRODUCT. IT CONTAINS NO ELECTRICAL CERTIFICATIONS AND IS NOT ADVERTISED AS SUCH. USE AT Y OUR OWN RISK.
Thank you for purchasing the Project Horizon Headphone Amplifier Kit. This kit requires minimal electronics and
soldering knowledge. The layout is easy to follow and setup is a snap! Please make sure to follow the instructions
outlined in this guide and you will be enjoying your amp in no time. First, lets go over the tools and items required
for your build which are as follows:
Required Assembly Tools:
- Soldering iron, 25W minimum – Variable temp soldering station preferred with 1.5 – 2mm wide chisel tip
- .032 diameter 60/40 or 63/37 Tin/Lead solder is recommended. Lead free is difficult to work with and not recommended
- Magnifying glass (recommended but not required)
- Rubber Gloves (recommended but not required)
- 3M Green or Red Scotch Brite (recommended but not required)
th
- 3/32
Allen Key
th
- 5/64
Allen Key
- Flush cuts
- 90% Isopropyl alcohol (recommended but not required)
- Paper Towels (recommended but not required)
- Digital Multi Meter (DMM or DVOM)
Before You Start Soldering:
Prep work needs to be done. Wash your hands thoroughly and dry. Put on the recommended rubber gloves and scrub down
the PCB (circuit board) on both the front and back side with 90% isopropyl alcohol to clean any residuals off of the board
from manufacturing. Once the board has been cleaned, set it on a dry paper towel out of the way. Try to use the rubber
gloves during the entire assembly process to keep oils off of the board and solder joints.
Heatsink Assembly Preperation:
Pre-assemble the heatsinks as shown below. The insulators and shoulder washers MUST be used appropriately and as
shown or a short will occur, damaging the amplifier. Do not over tighten the allen bolts. They should be tightened down
securely without crushing the insulating shoulder washer. Make sure the IRL510 and LM317 devices are pointing straight
down once secured. After each heatsink is completed, set it on its side so the leads that go into the PCB are not bent.
IRL510 AND LM317 DEVICES MUST BE ATTACHED TO THE HEATSINK
IN THE FOLLOWING ORDER. FAILURE TO DO SO WILL RESULT IN
DAMAGE TO THE AMPLIFIER
1/4" 4-40 ALLEN
BUTTON HEAD
SCREW
SHOULDER
WASHER
WARNING:
IRL510 OR
LM317
4-40 HEX
NUT
INSULATOR
IRL510
IRL510
LM317
LM317
POSITION IRL510 AND LM317 DEVICES AS SHOWN
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