QS/SQ Encoder V2.2

About implementation

 In silk, the variable resistor is RV ***,
  but in the circuit diagram it is VR ***.
 Even if you don't sort the parts, 
  you can get the performance that is practical enough.
  The parts of the phase shift circuit are,
  Register has an accuracy of J (�} 5%) or higher.
  Film has an accuracy of J (�} 5%) or higher.
  Ceramic has an accuracy of J (�} 5%) or higher.
 Please sort other parts if you have time and money.

 It is recommended to wash the board with
  tap water as much as possible
  (without using solvent or soap).
  Please solder immediately after washing.

 By soldering to the lower left solder jumper,
  the mounting holes will be grounded.

 Regarding decup capacitors

  There is no problem even if you do not use
   C125, C126, C127, C128, C129, C130.

 Regarding the input level adjustment circuit

  Ordinary variable resistors and semi-fixed resistors can be used,
   I recommend a semi-fixed resistor because 
   it is rarely changed and it is often touched by mistake.
    When using semi-fixed, solder to the solder jumper as propriate.
   The curve of the variable resistor is recommended to be B type.

 Regarding 4.0ch and 5.1ch

  Although it supports 5.1ch, most playback equipment has a down-conversion function,
   so I don't think it will be used.
  Therefore, since it is not used in 5.1ch, 
   VR106, VR107, C123, C124, R140, R150, R141, R151, are unnecessary.

 Regarding power supply

  No heat dissipation plate is required.

  Supports single power supply and dual power supply.
   Depending on how the parts are mounted, it is possible to operate with
    a single power supply of 15-18V or with Dual power supplies of +/- 15 to +/- 20V.

  For a single power supply, 
   C134, C135, C136, C137, U108, U109, D104, D105, are not required.
   DC power is supplied via the DC jack.
�@�@�@
  For dual power supplies,
   C138, R154, R155, D102, D103, R118, R119,
   Q101, Q102, R121, R122, R156, R157,
   D106, C131, U107, C132,
    are not required.
   Use jumpers for R159, R158, and C133.
   The DC power supply does not use the DC jack.
    Supply +/- 15V DC from the P116 connector.

Regarding switching of QS / SQ encoding method

  When switching with a 2-circuit 2-contact slide switch
   In some cases it may be necessary to solder to the back side.
  When switching with an external 4-circuit 2-contact rotary switch,
   there is a ground pattern for the shielded wire.


About Adjustment

 In most cases,
  Maximize each variable resistor at the input.
  Adjust the output variable resistor so that
   the equipment in the next stage does not clip.
  and You should be able to use it with this.

 If the output voltage of the previous stage is 3.5Vrms or more, 
  please note that the encoder will clip. (at 15V single power supply)

 When adjusting 

  Prepare a signal generator and oscilloscope.
  Set to QS encode mode.
  Generates a signal of about 1kHz, 1.4Vrms (4Vp-p).

  Adjust the variable resistors of each input so that the Lch output voltage
   becomes the same regardless of whether the signal is input to FrontLch or RearLch.
�@Similarly,
  Adjust the variable resistors of each input so that the Rch output voltage
   becomes the same regardless of whether the signal is input to FrontRch or RearRch.