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Roland AG-5 Funny Cat
+9V +9V +9V Source +9V R1 220K SDS/ Normal Switch C5 0.01uF C4 680nF Tant + R7 220K R5 2.2K SDS Level B50K Normal C3 220nF Tant + Note polarity! C11 0.056 +9V C7 1uF + D2 1N4148 R23 12K A B C Mode Sw A B C D3 1N4148 + C9 1uF R14 220K R11 1.2K R15 22K R12 220K +9V Module B2 C10 0.01 R13 220K R16 22K R3 470K R4 22K R8 1K Balance B50K Effect SDS Norm R20 470K Q3 2SC1000 R21 2.2K C17 0.056 PP3 Vdc +
+9V Module A
C18 0.01 R19 6.8K
Normal Output Jack
Input Jack
C1 0.033 R2 220K +
+ Rfba 470K
C16 0.01 Harmonic Mover
- Redrawn based on "moosapotamus's" tracing and schematic - Shaded resistors are inside opamp modules, value not presently known - Capacitors with "+" polarity indication are polarized - Capacitors marked "Tant" are tantalum - 22Jan03: corrected polarity of tantalum cap in "compressor" section
Q1 2SK30A
C2 - 1uF
D1 1N4148
R22 100K
R6 100K
+9V Module B1
Peculiarities
1. Module A circuit looks like a compressor but isn't. The loop gain is so high that the gain reduction loop overconpensates, and because the filtering cap is so small, it cuts a core out of the positive going side of the signal. 2. Transistor Q3 is a switched buffer. It buffers the dry signal when in non-SDS mode and the SDS output when in SDS mode. The guitar signal is always loaded with at least the 110K of the first stage, and also the 470K of the Q3 stage.
R9 47K + C6 1uF +
+ Rfbb 100K
+ Rfbc 100K C13 0.022 R18 6.8K C12 0.022 Q2 2SC828
C8 1uF R26 22K R25 47K
R10 47K
+ C19 47uF
R17 22K + C14 1uF
R24 220K
Drawing copyright 2003 R.G. Keen. All rights reserved.
+9V +9V Source C15 100uF 16V +9V R1 220K 3 C1 0.033 R2 220K + 2 SDS/ Normal Switch 1 C4 680nF Tant + R7 220K SDS Level B50K Normal C3 220nF Tant + Note polarity! - Redrawn based on "moosapotamus's" tracing and schematic - IC opamps used instead of modules - Opamp follower used instead of 2SC1000 - Capacitors with "+" polarity indication are polarized - Capacitors marked "Tant" are tantalum R9 47K + C6 1uF + C11 0.056 +9V 3 8 1 +9V 100R C7 1uF D3 1N4148 R14 220K R11 1.2K R15 22K R12 220K 5 C10 0.01 R13 220K R16 22K R3 470K R4 22K R8 1K Balance B50K Effect C5 0.01uF SDS Norm R20 470K 5 C18 0.01 R19 470K 6
PP3 Vdc
+
+9V 8
+ U1B -
7
C17 0.056 R21 2.2K C16 0.01
Normal Output Jack
Input Jack
+ U1A -4
Rfba 470K
R5 2.2K D1 1N4148
Harmonic Mover
Updated Roland AG-5 Funny Cat
Q1 2SK30A
C2 - 1uF
R22 100K
R6 100K
+ U2A 2 -4
Rfbb 100K
+ Added to + C9 help ensure 1uF stability D2 for opamp 1N4148 R23 12K A B C Mode Sw A B C
6 U2B Rfbc 100K C13 0.022 R18 6.8K
+ -
7
C8 1uF R26 22K R25 47K
R10 47K
+ C19 47uF
R17 22K + C14 1uF
C12 0.022 Q2 2SC828
R24 220K
Drawing copyright 2003 R.G. Keen. All rights reserved.
To Millenium Bypass for entire effect LED
Output Jack
+9V Source +9V PP3 Vdc +9V R1 220K 3 C1 0.033 R2 220K + 2 SDS/ Normal Switch 1 C4 680nF Tant + R7 220K SDS Level B50K Normal C3 220nF Tant + Note polarity! - Modified for LED status indicators - Includes true bypass for entire pedal R6 100K 3 R9 47K + C6 1uF + +9V 8 1 +9V 100R C7 1uF D3 1N4148 R14 220K R11 1.2K R15 22K R12 220K 5 C10 0.01 R13 220K C11 0.056 R16 22K R3 470K R4 22K R8 1K Balance B50K Effect C5 0.01uF SDS Norm R20 470K 5 C18 0.01 R19 470K 6 To Millenium Bypass for "Harmonic Mover" LED
+
C15 100uF 16V
+9V 8
+ U1B -
7
C17 0.056 R21 2.2K C16 0.01
Normal
Input Jack
R28 1M
+ U1A -4
Rfba 470K
R5 2.2K D1 1N4148
Harmonic Mover Switch
Mondo Updated Roland AG-5 Funny Cat
Q1 2SK30A
C2 - 1uF
R22 100K
+ U2A 2 -4
Rfbb 100K
+ Added to + C9 help ensure 1uF stability D2 for opamp 1N4148 R23 12K A B C Mode Sw A B C
6 U2B Rfbc 100K C13 0.022 R18 6.8K
+ -
7
C8 1uF R26 22K R25 47K
R10 47K
+ C19 47uF
R17 22K + C14 1uF
C12 0.022 Q2 2SC828
R24 220K
Drawing copyright 2003 R.G. Keen. All rights reserved.
Silly Feline PCB layout and wiring
Input Output
The full sized PCB layout is shown at bottom left, and the parts stuffing diagram and wiring diagram is at left. Pots are show viewed from the back. Note that the original Funny Cat was not a true bypass box. The input impedance of this effect will be in the 50K region, enough to have treble loss when the SDS/Normal switch is in the "Normal" position. A true bypass around the whole thing might be a good addition.
Norm SDS SDS Level B50K Batt Norm Balance B50K
In making the PCB, all holes except off-board wiring pads and the switch pads are drilled out to 0.028" to 0.032". The off-board wiring pads need to be about 0.040", and the switch pad holes need to be 0.060" to 0.062" to accommodate the pins of the specified switch. Notice the square pads. Those are polarity designators. The square pads in the IC layout patterns signify pin 1. In the electrolytic caps, the square pad is the (+) pin. Only Q2A or Q2B are used, not both. Q2A is the original type number with pinout ECB for the Japanese "2SC" types, and Q2B is pinned out EBC for "2N" types. Use whichever type you can get, but put it in the correct footprint. On the board layout, C6 and R9 are reversed in order from the schematic. This has no effect on the unit's operation.
Full size toner transfer pattern
R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15 R16 R17 R18 R19 R20
220K 220K 470K 22K 2.2K 100K 220K 1K 47K 47K 1.2K 220K 220K 220K 22K 22K 22K 6.8K 470K 470K
R21 2.2K R22 100K R23 12K R24 220K R25 47K R26 22K R27 100 Rfba 470K Rfbb 100K Rfbc 100K R28 1M C1 0.033 C2 1uF C3 0.22tant C4 0.68 tant C5 0.01 C6 1uF C7 1uF C8 1uF C9 1uF
C10 C11 C12 C13 C14 C15 C16 C17 C18 C19
0.01 0.056 0.022 0.022 1uF 100uF16V 0.01 0.056 0.01 47uF 16V
SDS Level - 50K log Balance - 50K log All diodes 1N4148 U1, 2 = dual opamp Q1 2SK30A Q2A 2SC828 Q2B 2N3904 Sw1 = 4P3T rotary Mouser # 105-14574 (Lorlin nylon rotary switch #105-14574 )
The other usual stuff: SPDT switch (SDS/N) DPDT stomp (s) Input and output jacks Box battery clip knobs wire solder time attention money...
Copyright 2003 R.G. Keen. All rights reserved. No permission for display from web sites without written permission.