Difference between revisions of "SCF-2"
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== Features == | == Features == | ||
| + | * Digital Inputs or Outputs | ||
* (2) 3.5mm Jacks | * (2) 3.5mm Jacks | ||
* Scaling resistors | * Scaling resistors | ||
| − | * | + | * Schottky Clamping Diodes |
* Filter cap | * 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 === | ||
| + | |||
| + | [[file: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 | ||
| + | |||
| + | [[FILE:SCF-2_J3.PNG]] | ||
| + | |||
| + | * Pinout | ||
| + | |||
| + | # VCC | ||
| + | # VCC | ||
| + | # VP1 - Tip J1 | ||
| + | # VR1 - Ring J1 (not used in Synth applications) | ||
| + | # VP2 - Tip J2 | ||
| + | # VR2 - Ring J2 (not used in Synth applications) | ||
| + | # GND | ||
| + | # GND | ||
| + | |||
| + | == Build Options == | ||
| + | |||
| + | [[FILE: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) | ||
| + | |||
| + | === Build as Adapter (No SCF) === | ||
| + | |||
| + | * Just install 0 Ohms series resistor at R1, R2 | ||
| + | |||
| + | === Build as Buffered Connection=== | ||
| + | |||
| + | * Install series resistors at R1, R2 | ||
| + | |||
| + | === Build as Filter Without Clamping === | ||
| + | |||
| + | * R1/C1 filter | ||
| + | * R2/C2 filter | ||
| + | |||
| + | == Mechanicals == | ||
| + | |||
| + | [[FILE:SCF-2_REV1_MECHS.PNG]] | ||
Latest revision as of 21:47, 4 October 2022
Contents
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
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
- Pinout
- VCC
- VCC
- VP1 - Tip J1
- VR1 - Ring J1 (not used in Synth applications)
- VP2 - Tip J2
- VR2 - Ring J2 (not used in Synth applications)
- GND
- GND
Build Options
- D1-D3 = Clamping diodes
- R1, R2 = Series resistor
- R3, R4 - scaling resistors
- C1, C2 - Parallel capacitor
- J3, 1x4 or 2x4 (above)
Build as Adapter (No SCF)
- Just install 0 Ohms series resistor at R1, R2
Build as Buffered Connection
- Install series resistors at R1, R2
Build as Filter Without Clamping
- R1/C1 filter
- R2/C2 filter
Mechanicals
