====== Kaatskit Radio Company ======

===== Products =====

==== Quad Stereo Line Amp ====

It's 4 stereo line amps in a single package.  You can use it as a distribution amp, level corrector, or hum eliminator.

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The outputs are transformerless cross-coupled active balanced, so you can ground either side like you can with a transformer.   Since it's a kit, you can build it as either floating balanced, for best flexibility like a transformer, or you can build it non-floating like grounding the center tap of the transformer.

=== Connectors ===
  * Input/Output: RJ-45
    - L in/out +
    - L in/out -
    - R in/out + 
    - Chassis Ground
    - NC
    - R in/out -
    - Power in -15V
    - Power in +15V

=== Input ===
  * Type: Two op-amp instrumentation balanced.
  * Input impedance (standard gain): 40k differential, 20k single-ended. 
  * Common mode range (standard gain): +/- 70 volts (140 v p-p)
  * Connection: RJ-45, industry standard, with power input, two jacks in parallel

=== Output ===
  * Type: Active Balanced, choice of floating (standard) or non-floating (option).
  * Clip level: +/- 15 supply: Non-floating: 48 v p-p, +26 dbu, Floating: 24 v p-p, +20 dbu, with one side grounded or +26 dbu with balanced load
  * Clip level: 24 v  supply: Non-floating: 40 v p-p, +24 dbu, Floating: 20 v p-p, +18 dbu, with one side grounded or +24 dbu with balanced load
  * Connection: RJ-45, industry standard, with power input, two jacks in parallel

=== Power supply ===
  * +/- 15 volts, 100 mA, supplied through the input output connector, Studiohub standard.
  * or  24 volts, 100 mA, external power supply.
  * Both can be used at the same time for redundancy.

=== Gain ===
  * Standard: (for distribution amp or hum eliminator) Adjustable, -9 db to +7 db 
  * High gain option: (for consumer to pro conversion) Adjustable, -3 db to +13 db
  * Low gain option: (for pro to consumer conversion) Adjustable, -15 db to +1 db

=== IC's ===
  * First stage:  LF353  dual op-amp
  * Second stage: NE5532 dual op-amp
  * For repair, any standard dual op-amp will work.

=== Documentation ===

  * {{:kaatskit:outboard-as-line-amp.sch.pdf|schematic}}

=== Price ===
^                   ^  Kit  ^ Assembled ^
| with power supply |  $75. |  $150.    |
| w/o  power supply |  $65. |  $130.    |
| Bare board, no ps |  $50. |  $100.    |


If you use our console, or any Studiohub+ compatible console that supplies power to external devices, they can be powered through the RJ45 audio connection from the console.  Otherwise they require +/- 15 volts.  +/- 12 volts or even lower will work, but with a reduction in headroom.