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Project
Solstice
TH
USER MANUAL – FEBRUARY 5
2015
WWW.GARAGE1217.COM
PLEASE READ THIS MANUAL TO COMPLETION. SPECIAL SETTINGS SUCH AS THE OHV JUMPER
CAN DAMAGE A TUBE IF SPECIFIC INSTRUCTIONS FOR ITS USE ARE NOT FOLLOWED
WARNING:
Although Project Solstice runs at a generally safe 24VDC, 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 resulting
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 using low impedance headphones with power ratings of 300mW or lower, there is a chance you could blow out the drivers
if left playing at high levels – unattended. At high power levels an SPL of over 120dB may be reached in efficient
headphones which is harmful to your hearing. Project Solstice is a very high powered headphone amplifier – use caution
and common sense. High output headphone amplifiers like Solstice are designed to power very demanding headphones or
provide all the headroom you could want with more efficient designs, not to see if you can get your jawbone to rattle.
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. SOLSTICE IS
CONSIDERED A HOBBY LEVEL PRODUCT. IT CONTAINS NO ELECTRICAL CERTIFICATIONS AND IS NOT ADVERTISED AS SUCH. USE AT YOUR OWN RISK.

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Summary of Contents for Garage1217 Project Solstice

  • Page 1 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. SOLSTICE IS...
  • Page 2 Project Solstice Specifications - Solid state output stage - Non overall feedback - triode voltage gain stage - Power supply: 24VDC (0.15A cont, 0.40A peak) - Input Resistance: 61kΩ With default 50k gain module - Gain: 12dB (selectable and dependent on tube) - Max Output voltage: 7Vrms at 300Ω...
  • Page 3 Project Solstice Thank you for purchasing the Project Solstice 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...
  • Page 4 Project Solstice Bottom Chassis Prep / Final Chassis Assembly: - ONCE THE PCB HAS BEEN ASSEMBLED, ASSEMBLE EACH OF THE 4 RUBBER FEET AS THUMB SCREW SET IT ONTO THE FOUR THREADS SHOWN, ATTACHING EACH FOOT TO THE GRAY STICKING OUT OF THE BOTTOM GRAY SMOKED ACRYLIC BOTTOM CHASSIS ACRYLIC CHASSIS THAT YOU CLEAR ACRYLIC TOP...
  • Page 5 - If load testing Project Solstice, it is not recommended to attach a dummy load with a value below 15Ω when testing at full output power for a long periods. Heatsinks and the output devices at the bottom will become quite hot during testing. The amplifier will go into thermal protection when chip temperatures of 150oC are reached.
  • Page 6: Assembly Guide

    Project Solstice Assembly Guide POWER SWITCH RCA LINE-IN POWER JACK OHV (OPTIONAL HEATER VOLTAGE) ONLY CHANGE HEATER VOLTAGE JUMPER FROM DFLT IF YOU SELECTION HAVE A FULL UNDERSTANDING OF WHAT IT DOES. CHECK PAGE 12 FOR DETAILS LED ON/OFF OUTPUT IMPEDANCE SETTINGS ATTENUATION MODULE PROTECTION CIRCUIT LED...
  • Page 7 Project Solstice STEP 1: POPULATE ALL SMALL COMPONENTS ON THE BOARD SUCH AS RESISTORS, DIODES AND SMALL CAPACITORS. THROUGHOUT YOUR BUILD, ALWAYS INSTALL THE SMALLER PARTS FIRST, WORKING YOUR WAY UP TO THE LARGER COMPONENTS PAY CLOSE ATTENTION TO THE GRAY OR BLACK BAND ON EACH DIODE / ZENER AS THEY ARE DIRECTIONAL...
  • Page 8 Project Solstice STEP 2: POPULATE ALL MID SIZE COMPONENTS SUCH AS RCA’S, POLARIZED CAPACITORS MUST BE INSTALLED IN THE CORRECT DIRECTION (WILL HAVE A STRIPE DOWN THE SIDE POWER COMPONENTS, SMALL CAPACITORS, TUBE SOCKET, DESIGNATING POLARITY) INSTALL THIS STRIPE FACING THE RELAYS, TRIMMERS AND SO FORTH FLAT SPOT ON THE CAPACITOR OUTLINE ON THE BOARD CORRECT...
  • Page 9 Project Solstice INSTALLING THE SMD INDUCTOR INSTALLING AN SMD DEVICE IS ACTUALLY QUITE SIMPLE – HOWEVER MANY WORRY THAT IT IS DIFFICULT. ALL YOU NEED TO DO IS FOLLOW A FEW SIMPLE STEPS IN ORDER FOR THE INSTALLATION TO BE A SUCCESS. 1.
  • Page 10 Project Solstice VOLPOT GROUNDING GROUNDING THE VOLUME POTENTIOMETER IS REQUIRED AS WITHOUT IT, THE AMPLIFIER MAY BE SUBJECTED TO NOISE / INTERFERENCE. THE IMAGES ARE OF THE PREVIOUS GENERATION SUNRISE, HOWEVER THE GROUNDING PRINCIPAL IS EXACTLY THE SAME. FIRST, INSERT A WIRE LEAD INTO THE RIGHT SIDE VIA NEXT TO THE VOLPOT AND SOLDER IN PLACE.
  • Page 11 Project Solstice STEP 3: POPULATE ALL LARGE SIZE COMPONENTS SUCH AS LARGE CAPACITORS AND HEADPHONE JACK...
  • Page 12 Project Solstice COMPLETED SOLSTICE LAYOUT AND PHOTO:...
  • Page 13 Project Solstice Project Solstice has several jumpers settings to customize the amp the way you would like it. Below gives you the details on what these jumper settings do! CAUTION!!! READ INSTRUCTIONS CAREFULLY!!! THE OHV “OPTIONAL HEATER VOLTAGE” JUMPER IS...
  • Page 14 Project Solstice Jacks Resistors J1 = HEADPHONE JACK X 1 R1 = SM 100K X 1 J2 = TUBE SOCKET X 1 R2 = SM 470K X 1 J3 = BLACK RCA JACK X 2 R3 = SM 10K X 1...