Difference between revisions of "SCF-2"

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Line 10: Line 10:
 
* Ring pin brought to connector
 
* Ring pin brought to connector
 
** Ring pin is not used in Synth applications
 
** Ring pin is not used in Synth applications
** Card can be used as a 3.5mm breakout
+
** Card can be used as a 3.5mm breakout (1x5 vertical header mounted to rear)
 
* (2) 4-40 mounting holes
 
* (2) 4-40 mounting holes
 +
* 36mmx28mm
  
 
=== Schematic ===
 
=== Schematic ===

Revision as of 13:07, 2 October 2022

SCF-2 REV 1 FRONT 3D.png

Features

  • Digital Inputs or Outputs
  • (2) 3.5mm Jacks
  • Scaling resistors
  • Schottky Clamping Diodes
  • Filter cap
  • Ring pin brought to connector
    • Ring pin is not used in Synth applications
    • Card can be used as a 3.5mm breakout (1x5 vertical header mounted to rear)
  • (2) 4-40 mounting holes
  • 36mmx28mm

Schematic

SCF-2 Channel Schematic.PNG

Used as Digital Input

  • 550K input impedance presents light load
  • R1/R3 - Input scale resistors
    • Ex: 5.0V control voltage to 3.0 V
  • Clipping diodes protect inputs
  • R1/C1 create input filter = 2.2mS = 454 Hz

Used as Digital Output

  • Drive with 5V low output impedance source
  • DNP R3, C1
  • Use lower value for R1 (typically 200 Ohms, etc)
  • Can leave Clipping Diodes to protect driver

Connectors

J1, J2 - 3.5mm Jacks

  • Tip
  • Sleeve

J3 - I/O Connector

  • 2x4 Header, 0.1"
  • Either 2x4 (Stereo) or 1x4 (mono)
    • Install 1x4 on 1,3,5,7 pointing down for breadboard

SCF-2 J3.PNG

  • Pinout
  1. VCC
  2. VCC
  3. VP1 - Tip J1
  4. VR1 - Ring J1 (not used in Synth applications)
  5. VP2 - Tip J2
  6. VR2 - Ring J2 (not used in Synth applications)
  7. GND
  8. GND

Build Options

SCF-2 REV1 CAD.PNG

  • D1-D3 = Clamping diodes
  • R1, R2 = Series resistor
  • R3, R4 - scaling resistors
  • C1, C2 - Parallel capacitor
  • J3, 1x4 or 2x4 (above)

Mechanicals

SCF-2 REV1 MECHS.PNG