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stv1756

High Rollers
  • Content Count

    18
  • Joined

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13 Good

About stv1756

  • Rank
    High Roller

Profile Information

  • Location
    Los Angeles
  • Gender
    Not Telling

Converted

  • Location
    Los Angeles
  • Interests
    DIY
  • Occupation
    Servant
  • Headphones
    HD800
  • Headphone Amps
    DIY 6C33 Balanced CF, ECP Audio Black Diamond, Dynahi, Balanced Dynalo
  • Sources
    Audio Note 4.1 Balanced, DIY ES9018, Assemblage 3.0
  • Other Audio Gear
    RPI with Volumio

Recent Profile Visitors

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  1. Boards received. Thanks! Much appreciated.
  2. Payment sent for extra GRLV boards. Thanks Soren!
  3. We ordered from the BOMs that were first posted. Everything was good except the 4700uf caps for the 15v PS need to be 16mm dia with 7.5mm lead spacing. Also as mentioned above, to get to 20ma (1v across the testpoints) you will need to lower the 182 ohm resistor by the offset pot to 120 ohm. Amp been running for 3 hours without any issues. Initial impressions? Reminds me of the T2! Many thanks to Kevin, Brigir, Michael and others for an outstanding design and for putting this group buy together. Photo is from yesterday before installing the transformer and the wiring.
  4. After some trial and error, we got the Dynahi to make music. And it sounds fantastic – prefer it to my balanced Dynalo with my grados (although it was built for Andy’s LCD-2). The following is what I learned in the process. There are a few discrepancies in the PS silkscreen as compared to the schematic: -R9 and R20 are 5K in the schematic and 10K in the silkscreen. -R15 is 10K in the schematic and 20K in the silkscreen. In both cases I followed the silkscreen. When powering up the amp boards the PS was blowing transistors. So I removed Q24, Q9, Q10, Q15, Q14, and Q26 (as per
  5. Here is working code for volume plus balance: #include <Wire.h> int sensorPinVol = A0; // select the input pin for the volume potentiometer int sensorPinBal = A1; // select the input pin for the balance potentiometer const byte attSetAddr0 = 0x38; const byte attSetAddr1 = 0x39; const byte attResetAddr0 = 0x3E; const byte attResetAddr1 = 0x3F; const int numReadings = 12; // max readings for averaging const int relayLatchTime = 3; // time in milliseconds const int maxPotVariation = 4; // max allowed variation in pot voltage without changing volume int cur
  6. Here is code to control two attenuators (i.e. balanced) with a potentiometer. Wire pot pins 1 and 3 to 5v and ground, and the wiper to A0 (analog input 0). Should work for a single board as well. For balanced configuration jumper id pins 1 and 2 of the second board (to change the address). Based on the code previously posted by Kerry. #include <Wire.h> int sensorPin = A0; // select the input pin for the potentiometer const byte attSetAddr0 = 0x38; const byte attSetAddr1 = 0x39; const byte attResetAddr0 = 0x3E; const byte attResetAddr1 = 0x3F; const int numR
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