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upc1237

  1. R

    NAD C315BEE Protection at about 1/4 Volume

    Need Help with NAD C315BEE Protection This amp goes into protection when I adjust volume to 1/4 to 1/2 full, with input of 1kHz sinewave at 2 Vp-p. Output offsets are less than 10mV and output is a clean sinewave. With no input I can go full volume without a protection kicking in. Tried with...
  2. S

    Custom UPC1237 speaker protection board for Phase Linear 400

    I made my own speaker protection board for my PL400 Series II. This was made completely out of parts rescued from scrap, except the UPC1237s. I ordered those for a couple dollars shipped from Hong Kong. I made my schematic based on the UPC1237 datasheet, and values from this project at...
  3. keilau

    E19 headphone amplifier board K2381 J407 MOSFET Yuanjing Audio

    I have a Sennheiser HD598 headphone currently used with the headphone amp section of a Tianyun Zero DAC with very good results. Just for the fun of it, I decide to build a solid state separate headphone amp. I found the YuanJing assembled board at a very good price...
    • keilau
    • Thread
    • headphone amplifier mosfet upc1237 yuanjing audio
    • Replies: 1
    • Forum: Headphones
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