Difference between revisions of "ER-ADSR-555-01"
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* Using 1 M linear pots instead of 2.2M log pots | * Using 1 M linear pots instead of 2.2M log pots | ||
** A, D, R pots should have been log pots | ** A, D, R pots should have been log pots | ||
| − | + | * All of the pots are backwards (rework below) | |
| − | + | * A, D, S pots should be CCW for no delay | |
| − | + | * S pot should be CW for full output | |
| − | |||
| − | |||
* ADR series resistors are 220 Ohms but should be 100 Ohms per schmitzbits note | * ADR series resistors are 220 Ohms but should be 100 Ohms per schmitzbits note | ||
| − | * C3 | + | * Attack overshoots |
| + | * May need > 100 ohms | ||
| + | * C3 s/b 1 uF for the pots to have a good range | ||
* Log pot curves | * Log pot curves | ||
[[file:LOGPOT.jpeg]] | [[file:LOGPOT.jpeg]] | ||
| − | * | + | * Scope capture |
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| − | [[FILE:ER-ADSR- | + | [[FILE:ER-ADSR-555_CAP_005.png]] |
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== Benjie Jiao - DIY Modular Video == | == Benjie Jiao - DIY Modular Video == | ||
Revision as of 00:59, 6 November 2022
Contents
Eurorack ADSR Module
Features
- Attack-DeCay-Sustain-Release Eurorack ADSR Module
- Takes in Gate signal, generates CV to VCA
- Attack, decay, and release pots control speed
- Attack, decay, and release times can range from 200ms to 16s
- Sustain pot sets the sustain voltage level
- LED dims to level
- 3U tall, 6 HP wide
- 555 Based design
- Benjie Jiao MiniADSR
- Original was based on Barry Klein design
- As built by schmitzbits design - "The Fastest Envelope in the West"
- Benji's build has a three card stack-up and is 4 HP wide
- This card is wider but uses 2 cards
Rev 1 Checkout
- Ordered wrong (earlier) version of the board
- Re-create ordered board in Rev 1 folder
- Annotated schematic
- Drive with Erica Synths EDU Sequencer
- GATE Out output
- At slowest speed, ~2Hz
- My schematic symbols are Schottky but installed 1N4148 like schmitzbits schemati
- Using 1 M linear pots instead of 2.2M log pots
- A, D, R pots should have been log pots
- All of the pots are backwards (rework below)
- A, D, S pots should be CCW for no delay
- S pot should be CW for full output
- ADR series resistors are 220 Ohms but should be 100 Ohms per schmitzbits note
- Attack overshoots
- May need > 100 ohms
- C3 s/b 1 uF for the pots to have a good range
- Log pot curves
- Scope capture
Benjie Jiao - DIY Modular Video
Issues
Rev 1 Issues
- Silkscreen has "DELAY" should be "DECAY"
- A, D, S, R pots are all backwards
- A, D, R pots should be A1M
- Made 2nd card
Cuts
- Cuts before assembling parts on card
- Cuts to RV1 (pins 2-3)
- Cuts to RV2 (pins 2-3)
- Cut to RV3 (pins 1, 3)
- Cuts to RV4 (pins 2-3 and pin 1)
Change Pot Series Resistor Values
- 220 Ohms on A, D, R pots s/b 100 Ohms
- Change R7 to 100 Ohms (A pot)
- Change R8 to 100 Ohms (D pot)
- Change R10 to 100 Ohms (R pot)
Add wires
- Add wire RV1-2 to RV1-1 (back side view)
- Add wire RV2-2 to RV2-1 (back side view)
- Add wire R9 left side to Sustain pot, RV3-1
- Add wire U2-7 to Sustain pot, RV3-3
- Add wire D3-K to RV4-3 (back side view)
- Add wire RV4-1 to RV4-2 (back side view)
Add Release Resistor
- Add 1M resistor
