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System Specifications

External Supply Voltage: 

+12V DC, 1.5A (per Frame), 2.1mm, centre-positive, polarity and 

over-current protected

Internal System Voltage: 

B/-15V, 500mA per rail per frame

Power Bus Connections: 

4 Way MTA100, 5” power cables

Waveform Voltages: 

10V peak-to-peak (unipolar 0-10V or b/-5V)

Gate Input Threshold: 

approx. +1V

Main Path Input Impedance: 

30K Ohm Typical

Control Input Impedance: 

100K Ohm Typical

Output Impedance: 

470 Ohm Typical 

Signal Connections: 

4mm Banana Socket, Impedance Balanced 1/4” socket

Module Size: 

Frac Rack Standard

Modules are measured in multiples of FracWidth (FW) with 1FW being 1.5” width.
Modules are 5.25” tall (3 rack unit) and a maximum of 1.65” deep.

Module Fixing: 

M3 x 10mm Bolt. 

The Frame Chassis and PCB Panels are all connected to Chassis 0V which joins the System 0V by 
the DCDC converter. 

Thanks to Palle Dahlstedt for his diverse and detailed observations during beta-testing.
And to the old-blue crew for allowing me to bounce  ideas off them for the last few years.

Guarantee

The SynthVoice comes with a 2 year 'reasonable' warranty. If any mechanical or electronic failure 
occurs within the period, I will repair the fault free of charge. This excludes failure from 

maltreatment or modification and any cosmetic degradation. Contact should first be made via 
email to discuss the problem. Shipping to return the device is paid by the user and I cover return 

shipping. Failures that are not covered by this guarantee may be fixed at standard rates.

Summary of Contents for Synth Voice

Page 1: ...ntroller Powered Frame The system exoskeleton with internal power distribution Patching within the system is free flowing due to the use of stackable 4mm banana cables and standardised signal amplitud...

Page 2: ...bus to individual MTA100 power headers to which the module power cables are connected These system power voltages can be considered as boundaries for signals within the system with the 0 Volt being t...

Page 3: ...the setting of the main Frequency control dial to determine the operating Cutoff Frequency You can think of a Control signal as being an automated knob twiddler and these can work at sub audio or aud...

Page 4: ...ial with positive voltages adding to the main sum and negative voltages subtracting As such A bipolar 5V signal will add and subtract from the master control setting For full control sweep set the mai...

Page 5: ...ds detailed below ensuring that it was externally brought up to suitable 10V P to P amplitude Interfacing with External Systems The Synth Voice can easily talk with other systems or external control d...

Page 6: ...cay phase changes the envelope back into attack phase without resetting to 0V Loop The output continuously oscillates between 0V and 10V Any gate inputs behave like in Triggered mode ignored during at...

Page 7: ...modulation patch the Wave output back into the EFM CV input Waveforms are skewed as positive or inverted modulation is brought in Tri Saw produce Log Exp shapes while Sqr produces different pulse widt...

Page 8: ...P to P 12 k Hz 8V P to P The Sub mode on the left hand section switches in extra filter capacitors to shift the range into sub audio frequencies Low pass corresponds to integration and functions like...

Page 9: ...source can be made by patching the Out to In A and turning the Initial dial up to near full The right hand unit has only one Main Path input again DC coupled but the response can be swept between Line...

Page 10: ...lly be used for audio signals The Output Mixer has three DC coupled inputs which feed two separate summing buses via individual Level controls Both 1 4 outputs are AC coupled and are Impedance Balance...

Page 11: ...tall 3 rack unit and a maximum of 1 65 deep Module Fixing M3 x 10mm Bolt The Frame Chassis and PCB Panels are all connected to Chassis 0V which joins the System 0V by the DCDC converter Thanks to Pal...

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