Bontempi

AX1800

Synthesizer

Main Details
Maker Bontempi Company
Function
Additional Model ID DE20
Form Factor Keyboard
Signal Path Analog Hardware
Made In ITALY
Power Source DC12v 5W or 7xR14/C battery
Notes CPU - IClO 80C32 microcontroller, ICll 64Kbyte EPROM programme and IC12 8Kbyte data RAM accomplish the data j
processing for dynamic keycontroller (DKC), IC22b, 25, 30, 31 are line connected as buffers for the keyboard data signals while IC4, 8, 15, 20 are for panel commands and LED drivers. IC10 internal oscillator is fixed at 12Mhz by Qzl ceramic resonator generating the CPU system CLOCK for microcontroller and respective connected devices.

SOUND GENERATIONI: IC19 TMS57002 the digital audio signal processor (DASP) contains the PCM synthesis algorithm,
this allows the generation of up to 15 individual waveforms. Each of these waveforms can be amplitude and frequency
modulated. The 12.5 Mhz clock signal generated by ICI 7 enters pin11 of the DASP (CKIN) to determine sampling frequency and generator the tuning. IC27 2Mbyte wavefrm ROM and IC28 8Kbyte RAM for delay effect complete the digital sound generation, IC22a, 23, 24, 26, 29 are for DASP, RAM ROM data connection and address expansion as well. DTL DTR Serial data output and serial data clock coming from IC18 both enter IC3 DAC for digital to analogue signal conversion. Left and right analogue signals enter ICI dual operational amplifier for equalizing, low pass filtering and amplification to level to supply the AUX OUT sockets, to ICl output lines 1~2 is also connected for power amplification.

RESET/MUTING: At power ON/OFF IC6 generates the reset signal (RST) for IC10 microcontroller and (RSN) for IC4 RAM, alsIo to IC 1 and IC2 RSN signal is connected as muting for power ON/OFF "plop" suppression.
Additional Specifications
KEYBOARD 61 Full - size touch sensitive keys.
POLYPHONY 13 keys Max
UPPER VOICE 15 polyphonic timbres - Acoustic Piano, Electric Piano, Digital Piano, Vibes, Acoustic Guitar, Strings 1, Pipe1, Pipe2 j Pipe3, Harmonium, Choir1, Oboe, Flute, Trumpet, Harpsichoid.
LOWER VOICE 15 polyphonic timbresĀ·- Acoustic Piano, Electric Piano, Digital Piano, Harp, Electric Guitar, Strings2 (Slow Strings}.' I 1! Pipe1, Pipe2, Pipe3, Horn, Brass Ensemble, Choir2 (Slow Choir), Acoustic Bass, Fretless, Timbals, Harpsichord.
DUAL MODE To play with UPPER and LOWER together.
EFFECTS Sustain ( controlled by switch pedal ), Spatial Stereo, Vibrato, X-Fade. CONTROL : Spatial Stereo.
SEQUENCER Real time recording of 900 notes track (otherwise twu tracks UPPER - LOWER of 450 notes each.
PROGRAMME Recording of 5 panel combinations
DEMOSONG 9 prerecorded musical pieces.
MIDI 16 channels full MIDI in omni off- MIDI set: channel programming, touch sens, volume, program change, pitch bend.
GENERAL CONTROLS Master volume, pitch.
TRANSPOSER +5 / -6 semitones.
AMPLIFICATION Stereo '4+4 Watt ( AMS ).
SOCKETS Phones, Aux Out, Input DC 12V, Pedal volume, MIDI IN/OUT/THAU.
Connections
MIDI IN
Connector: DIN
Description: Socket (Female)
MIDI OUT
Connector: DIN
Description: Socket (Female)
MIDI THRU
Connector: DIN
Description: Socket (Female)
AUX L
Connector: 1/4" Phone Jack (6.35mm)
Description: Mono
AUX R
Connector: 1/4" Phone Jack (6.35mm)
Description: Mono
PHONE
Connector: 1/4" Phone Jack (6.35mm)
Description: Stereo
Controls
Parameter: EXPAND SUSTAIN PEDAL
Control Type: Footswitch

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