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EFM Synthesizers EFM Mad Mouse Pro Assembly And Setup Manual

Midi synthesizer

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EFM Mad Mouse Pro - Midi Synthesizer
V1.0 (C) 2001 EFM Synthesizers
Assembly and Setup Manual
The Mad Mouse-Pro is a midi controlled analog synthesizer. It is designed to be built as a small stomp-box sized analog so that it
can be positioned on top of your master midi controller for easy access to it's controls. The Mad Mouse story started in late 1998
when I decided to design a small inexpensive analog synthesizer that could be built for under $50 dollars. I wasn't entirely
successful in a lot of ways. First of all it requires a separate midi to control voltage converter that cost more that the synthesizer did
and I went over budget by about $20 dollars. Still....it was a working analog synthesizer for under $200 dollars and that included
about $100 bucks for the separate midi converter.
The MM-pro contains an on-board midi to cv converter, a +/-12 +5V power supply, two Odyssey type oscillators, one MS20 2-pole
resonate VCF , two LM13600 VCAs and one MS10 type LFO.
The MM-pro's midi converter responds to midi pitch, pitch bend, mod, key-gate and glide-gate. The midi messages are converted
to control voltages. These voltages are used to control the analog sections of the synthesizer.
Board Location
Capacitors
C3, C4, C5, C6, C27 Capacitor - Ceramic 0.1 uF
C9
Capacitor - Ceramic 10 pF
Mad Mouse Pro - Parts List
Product Name
Mouser 140-50q9-104z
Mouser 140-50N5-100J
Source
Qty Used
Total
Unit Price
Price
5
$0.18
$0.90
1
$0.06
$0.06

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Summary of Contents for EFM Synthesizers EFM Mad Mouse Pro

  • Page 1 EFM Mad Mouse Pro - Midi Synthesizer V1.0 (C) 2001 EFM Synthesizers Assembly and Setup Manual The Mad Mouse-Pro is a midi controlled analog synthesizer. It is designed to be built as a small stomp-box sized analog so that it can be positioned on top of your master midi controller for easy access to it's controls.
  • Page 2 C7, C8 Capacitor - Ceramic 22 pF Mouser 140-50N5-220J $0.06 $0.12 C28, C29 Capacitor - Ceramic .001 uF Mouser 140-50p2-102k $0.09 $0.18 C10, C17 Capacitor - Ceramic .01 uF Mouser 140-50p5-103k $0.14 $0.28 C22, C23, C25, C26 Capacitor - Electrolytic 10 uF Mouser 140-XRL25V10 $0.05 $0.20...
  • Page 3 Dual 8-Bit DAC - 20 pin DIP Digi-key $5.89 $5.89 TLC7528CN IC 6N138 - Opto Isolator - 8 Pin Mouser $1.30 $1.30 IC 7805T Voltage Regulator +5 Mouser 511-L7805CV $0.40 $0.40 IC 7812T Voltage Regulator +12 Mouser 511-L7812CV $0.40 $0.40 IC 7912T Voltage Regulator -12 Mouser 511-L7912CV $0.40 $0.40...
  • Page 4 R29, R35, R40, R41, R44, R46, R48, R58, Resistor 100K Mouser 271-100K $0.09 $1.53 R63, R66, R67, R70, R72, R82, R89, R90 R4, R5, R7, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R30, R33,R36,R38, R52, R55, R76, R79, R87, Resistor 10K Mouser 271-10K $0.09...
  • Page 5 R132 Switches Switch - Mini Toggle on/off Mouser 10TC220 $1.70 $1.70 SPST Switch - Mini Toggle on/on S3, S4 Mouser 10TC260 $2.58 $5.16 DPDT Switch - Mini Toggle on/on S5, S6 Mouser 10TC230 $1.88 $3.76 SPDT Switch 4X Dip 4X DIP RA Mouser 571-4358023 $1.79 $1.79...
  • Page 6 Tolerance Color Value Multiplier Black +/- 20 Brown +/- 1 +/- 2 Orange 1,000 +/- 3 Yellow 10,000 +/- 4 Green 100,000 Blue 1,000,000 Violet 10,000,000 Gray 100,000,000 White Gold +/- 5 Install all of the resistors except R45 and R69. Silver 0.01 +/- 10...
  • Page 7 Install IC sockets in all spaces marked for ICs. NOTE: DO NOT INSTALL THE ICS YET. Install all Jumpers (15) except the one that’s next to R62 and the jumper next to PAD-C2 and R85. These two jumpers will be installed after the midi converter is working.
  • Page 8 Install the trimmers and DIP switch S2. You can use less expensive trimmers for T4,7 T1,2,3,5,6 T4 & T7 Install all transistors except Q29, and the Q13/Q14, Q16/Q17, Q22/Q23, Q25/Q26 pairs. NOTE: the pin-out on the pcboard for the N-Fets is for 2N3819s.
  • Page 9 Install the voltage regulators U1, U2, U3 and U8 (+5V DAC reference). LM7805 / LM7812 LM7912 LM336 5.0 Power Supply Test Hook up a 12VAC@500mA wall transformer to large PAD-A and the large ground PAD Before you plug it in be ready to up-plug it in case of smoke or heat. Get your meter and set it to AC Volts.
  • Page 10 If you have a scope. Measure Pins 15 and 16 of U5. You should see the PIC clock running at about 10MHz.. Pin-3 of U9 is multiplexed data ( looks like a changing staircase) when a midi key is played. PIC U5 Pins 15 &...
  • Page 11 Remove the PIC (U5), DAC (U6) and MUX (U9) place them in protective foam Disconnect the midi-jack VCO Assembly and Setup The Q16/Q17 and Q25/Q26 pairs need to be thermally The Q13/Q14 pair are PNP/NPN and should be thermally connected with connected.
  • Page 12 Adjust trimmer T3 until the pitch is one octave apart when playing the C3-C4 octave on the keyboard Connect your scope or monitor to VCO1 PAD-X Adjust trimmer T4 until you see/hear a 50% square wave. It will sound smoothest. Connect your scope or monitor to VCO2 PAD-V Adjust trimmer T6 until the pitch is one octave apart when playing the C3-C4 octave on the keyboard Connect your scope or monitor to VCO2 PAD-C2...
  • Page 13 Midi Wiring...
  • Page 14 Row 1 Wiring...
  • Page 15 Row 2 Wiring NOTE: I reversed the common wire for the Attack/Decay Pot when I drew this. This will cause the pots to function in reverse. Connect the common to the center and right terminal, connect the wire from the board to the left terminal.
  • Page 16 Row 3 Wiring NOTE: I reversed the common wire for the Attack/Decay Pot when I drew this. This will cause the pots to function in reverse. Connect the common to the center and right terminal, connect the wire from the board to the left terminal.
  • Page 17 Final Assembly and Setup Now is a good time to install and line up the spacers you intend to use to suspend the board over the controls. The best way I've come up with is to attach the spacers to the board. Put a drop of model paint or ink on the end and then position it in place. The paint will mark the inside of the case so you can drill the holes in the right place.
  • Page 18 Nothing should smoke or be hot to the touch. There should be no sound coming from the monitor amp. Check for +5 and +/-12VDC. Press a key on your keyboard. You should hear VCO1 and 2 mixed through the VCF and VCA. Tune VCO2 to VCO1 by adjusting T5 to match the initial frequency of VCO2 to VCO1.
  • Page 19 TLO72 LM556 TLO74 6N138...