DOEPFER MUSIKELEKTRONIK A-100 Analog Modular System Instructions

July 26, 2024
DOEPFER MUSIKELEKTRONIK

DOEPFER MUSIKELEKTRONIK GMBH

ANALOG MODULAR SYSTEM A-100

A-147-4 Dual VCLFO

Position and function of the pin headers and trimming potentiometers Board A

  1. P13: SCALE LFO1
  2. P12: OFFSET LFO1
  3. JP6: FREQUENCY RANGE LFO1
  4. JP8: RESET TYPE LFO1
  5. JP7: RECTANGLE DC OFFSET LFO1
  6. P17: RESET VOLTAGE
  7. P14: TRIANGLE DC OFFSET LFO1
  8. P16: SAWTOOTH DC OFFSET LFO1
  9. P15: SINE ADJUST LFO1
  10. JP14/JP15: JUMPER PARKING
  11. JP1: Bus Connector
  12. P10: SINE ADJUST LFO2
  13. P11: SAWTOOTH DC OFFSET LFO2
  14. P9: TRIANGLE DC OFFSET LFO2
  15. JP9: RESET TYPE LFO2
  16. JP5: RECTANGLE DC OFFSET LFO2
  17. JP4: FREQUENCY RANGE LFO2
  18. P8: SCALE LFO2
  19. P7: OFFSET LFO2

The grey marked jumpers JP4 and JP6 are not installed in the factory. If required the dummy jumpers of JP14/JP15 can be used.

Position and function of the pin headers and trimming potentiometers Board B

  1. JP13: TUNE RANGE LFO2
  2. JP12: CV DEFAULT LFO2
  3. JP10: CV DEFAULT LFO1
  4. JP11: TUNE RANGE LFO1
Functions of the pin headers

Board A

JP1 bus connection
JP2A/B internal connection between board A and B
JP3A/B internal connection between board A and B

JP4 Frequency Range LFO2 (not installed in the factory)
jumper installed: low frequency range
jumper not installed: high frequency range

JP5 Rectangle DC Offset Range LFO2
jumper installed: bipolar/symmetrical rectangle (~ -5V/+5V)
jumper not installed: unipolar/positive rectangle (~ 0V/+10V)

JP6 Frequency Range LFO1 (not installed in the factory)
jumper installed: low frequency range
jumper not installed: high frequency range

JP7 Rectangle DC Offset Range LFO1
jumper installed: bipolar/symmetrical rectangle (~ -5V/+5V)
jumper not installed: unipolar/positive rectangle (~ 0V/+10V)

JP8 Reset Type LFO1
jumper installed: level controlled reset (reset is active as long as the reset input is high)
jumper not installed: positive edge controlled reset

JP9 Reset Type LFO2
jumper installed: level controlled reset (reset is active as long as the reset input is high)
jumper not installed: positive edge controlled reset

JP14 Dummy Pin Header (Jumper Parking): parking of unused jumpers
JP15 Dummy Pin Header (Jumper Parking): parking of unused jumpers

Board B

JP10 Default CV LFO1
jumper installed: CV input socket is normalled to a positive voltage (~ +5V)
jumper not installed: no normalling of the CV input socket

JP11 Tune Range LFO1
jumper installed: wide range of the manual frequency control F
jumper not installed: small range of the manual frequency control F

JP12 Default CV LFO2
jumper installed: CV input socket is normalled to a positive voltage (~ +5V)
jumper not installed: no normalling of the CV input socket

JP13 Tune Range LFO2
jumper installed: wide range of the manual frequency control F
jumper not installed: small range of the manual frequency control F

Functions of the trimming potentiometers

Board A

P7 Frequency Offset LFO2
P8 Frequency Scale LFO2 (factory setting: 1V/Oct when CV control is fully CW)
P9 Triangle DC Offset LFO2 (factory setting: bipolar/symmetrical triangle)
P10 Sine Adjust LFO2 (factory setting: best sine shape)
P11 Sawtooth DC Offset LFO2 (factory setting: bipolar/symmetrical sawtooth)
P12 Frequency Offset LFO1
P13 Frequency Scale LFO1 (factory setting: 1V/Oct when CV control is fully CW)
P14 Triangle DC Offset LFO1 (factory setting: bipolar/symmetrical triangle)
P15 Sine Adjust LFO1 (factory setting: best sine shape)
P16 Sawtooth DC Offset LFO1 (factory setting: bipolar/symmetrical sawtooth)
P17 Reset Voltage
(this is the voltage where the triangles of LFOs start after a reset, the factory setting is 0V)

Important note: Please change the trimming potentiometer settings only if you are familiar with such adjustments and you understand the functions. For modules which are returned by the customer with misadjusted trimming potentiometers the working time required to correct the adjustment is charged.

A-147-4 Service Manual Seite

Documents / Resources

| DOEPFER MUSIKELEKTRONIK A-100 Analog Modular System [pdf] Instructions
A-100, A-100 Analog Modular System, Analog Modular System, Modular System, System
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