ER-DELAY-01

Features

• PT2399 Delay/Echo
  • The PT2399 is a CMOS single-chip echo processor IC
  • A high sample rate ADC converts the analog data into a bitstream, which is then stored in internal 44Kbit RAM
  • After processing, the bitstream is de-modulated by DAC and lowpass filter
  • The internal VCO clock frequency determines the overall delay duration
  • The user can easily modify the VCO frequency by changing the external resistance
• Eurorack 3U, 6HP card
• Built on ER-PROTO-02 card
• Input attenuator, output amplifier
• PT2399 has a maximum current of 30mA
• Jacks
  • J5 IN
  • J6 OUT
• Controls
  • RV1 - In/Out mix
  • RV2 - Delay Length
  • RV3 - Input Attenuator
  • RV4 - Output Gain
• 10 pin Eurorack power jack
  • Uses +12V only

Design

• ER-PROTO-02 card set
  • Front Panel
  • Controls Card
  • Daughtercard

Daughtercard Prototyping Area

Card Build

• Controls card rear

• Partly built

• PT2399 Pin 1 on bottom left

• Daughtercard

• Back of daughtercard

• Card Stackup

• Front view

U1 - PT2399 Delay IC

U3 - Output Amplifier

• Avoiding Op-Amp Instability Problems In Single-Supply Applications

• LTSpice Simulation

J28 - Pots connector on Daughtercard

J29 - Jacks connector on Daughtercard

J9 - Power connector on Daughtercard

U2 - 5V Power Regulator

J8 - Pots connector on Controls card

J7 - Pots connector on Controls card

Schematic

• Schematic

Nets

+5V,C10-1,C18-1,J28-1,U1-1,U2-1,
+12V,C1-1,C2-1,D1-1,J15-1,J15-2,J15-3,J15-4,J15-5,U2-3,
+12VA,J9-10,J9-9,RA1-2,
/IN,C17-2,J29-14,R13-2,
/J4-T,J29-6,
/OUT,C14-2,J29-8,
/P2,C3-1,U1-2,
/P6,R1-1,U1-6,
/P7,C4-1,U1-7,
/P8,C5-1,U1-8,
/P9,C7-1,U1-9,
/P10,C7-2,U1-10,
/P11,C6-1,U1-11,
/P12,C6-2,R3-2,U1-12,
/P13,C8-2,R4-2,U1-13,
/P14,C8-1,R5-2,R9-1,U1-14,
/P15,C11-2,R6-1,R8-1,U1-15,
/P15A,C14-1,R8-2,
/P16,C11-1,R7-1,U1-16,
/P16A,C15-1,C16-1,R12-2,R6-2,R7-2,
/POT1-2,C15-2,J28-18,
/POT1-3,C12-2,J28-19,
/POT3-1,J28-14,
/POT3-2,J28-15,
/POT3-3,J28-16,
/VCO,J28-8,R1-2,
GND,C1-2,C10-2,C13-2,C16-2,C18-2,C2-2,C3-2,C4-2,C5-2,C9-2,J28-20,J29-1,J29-15,J29-16,J9-3,J9-4,J9-5,J9-6,J9-7,J9-8,R13-1,U1-3,U1-4,U2-2,
Net-(C9-Pad1),C9-1,R3-1,R4-1,R5-1,
Net-(C12-Pad1),C12-1,C13-1,R9-2,
Net-(C17-Pad1),C17-1,R12-1,
Net-(D1-Pad2),D1-2,RA1-1,
Net-(J5-PadS),J5-S,J6-R,J7-15,J7-16,
Net-(J5-PadT),J5-T,RB7-1,
Net-(J6-PadS),J6-S,J7-1,J7-2,
Net-(J6-PadT),J6-T,R17-1,
Net-(J7-Pad8),J7-8,R17-2,
Net-(J7-Pad14),J7-14,RB7-2,
Net-(J8-Pad8),J8-8,RV2-1,
Net-(J8-Pad18),J8-18,RB1-2,
Net-(J8-Pad19),J8-19,RV1-3,
Net-(J11-Pad1),J11-1,RV2-2,RV2-3,
Net-(J11-Pad2),J11-2,J14-2,J8-1,J8-20,
Net-(J14-Pad1),J14-1,RV1-1,
Net-(RB1-Pad1),RB1-1,RV1-2,

• Glam Chorus with Vibe Mod

Measurements

• Bass Drum echo

• Both Mix/Length knobs full CCW

• All (4) drum triggers on IN

Reference

• Little Angel Chorus
• Avoiding Op-Amp Instability Problems In Single-Supply Applications
• PT2399 Dev Delay Assembly Instructions
• PT2399 Dev Delay BOM
• PT2399 Dev Delay PCB
• HAGIWO PT2399 clock sync delay
• PT2399 Analysis bu Electrosmash
• Useful design equations for the PT2399
• MFOS ECHOFXXX
• Valve Wizard Additional notes
• schmitzbits PT2399 based Delay

Videos

• Kristian Blåsol