A-100 prototype

Doepfer A-100 prototype

The A-100 prototype was a Eurorack format analogue modular synthesiser made by Doepfer circa 1995.

It quickly evolved into the regular A-100.

Standard configurations

A-100 prototype Base System
A-110 VCO										A-110 VCO										A-154 Ring Mod.				A-181 Waveform Processor								A-180 Frequency Divider								A-188 Trig. Inv.				A-189 Multiples				A-170 Mixer										A-120 VCF 1										A-131 VCA Log.								A-130 VCA Linear
A-190 MIDI-to-CV/Sync										A-190 Clock Divider Sequencer										A-150 LFO										A-150 LFO										A-150 LFO										A-115 Noise/Random										A-152 Dual S&H				A-140 ADSR										A-140 ADSR

The following modules were included in the Base System. There may or may not be any others.

Model	Name	HP	Description	Evolution
A-110	VCO	10	VCO	Footing range increased
A-115	Noise/Random	10	Noise generator	Narrowed to 8 HP; renumbered A-118
A-120	VCF 1	10	24 dB lowpass VCF	Narrowed to 8 HP
A-130	VCA Linear	8	Linear VCA	LED replaced with overall volume knob
A-131	VCA Log.	8	Exponential VCA	LED replaced with overall volume knob
A-140	ADSR	10	ADSR envelope generator	Time range switch added; gate 2 input replaced with retrigger input; narrowed to 8 HP
A-150	LFO	10	LFO	Narrowed to 8 HP
A-152	Dual S&H	4	Dual S&H	Renumbered A-148
A-154	Ring Mod. / Dual Voltage Inverter	4	Ring Mod / Dual Voltage Inverter	Split into A-114 dual ring mod and A-175 Dual voltage inverter
A-170	Mixer	10	Mixer	Split into A-138a and A-138b
A-180	Frequency Divider	8	Frequency divider	Renumbered A-115
A-181	Waveform Processor	8	Waveform processor	Renumbered A-116
A-188	Trig. Inv.	4	Trigger inverter	Various; renumbered A-165
A-189	Multiples	4	Multiples	Renumbered A-180
A-190	Clock Divider Sequencer	10	Clock divider / Gate sequencer	Split into A-160 and A-161
A-190	MIDI-to-CV/Sync	10	MIDI to CV and sync converter	Various

A-100: A-100 prototype