Roland_funny_cat_schematic 电路图 维修原理图.pdf

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1、+ - + - + - +9V +9V +9V +9V+9V Source PP3 Vdc Input Jack C1 0.033 R1 220K R2 220K Rfba 470K Rfbb 100K Rfbc 100K Module A C2 - 1uF + Q1 2SK30A C3 220nF Tant + R3 470K C5 0.01uF C4 680nF Tant + R5 2.2K R4 22K D1 1N4148 R7 220K SDS Level B50K R8 1K SDS/ Normal Switch Norm SDS R6 100K R9 47K + C6 1uF Mo

2、dule B1 Module B2 + C7 1uF D2 1N4148 D3 1N4148 R26 22K R23 12K C18 0.01 Q3 2SC1000 R20 470K R19 6.8K R21 2.2K C17 0.056 C16 0.01 Balance B50K Effect Normal R22 100K Harmonic Mover Normal Output Jack C11 0.056 R16 22K C12 0.022 C13 0.022 R18 6.8K Q2 2SC828 +9V +9V +9V R14 220K R12 220K R15 22K R13 22

3、0K C10 0.01 + C14 1uF R17 22K + C8 1uF R10 47K R11 1.2K + C19 47uF R24 220K R25 47K Mode Sw C9 1uF + Roland AG-5 Funny Cat - Redrawn based on moosapotamuss tracing and schematic - Shaded resistors are inside opamp modules, value not presently known - Capacitors with + polarity indication are polariz

4、ed - Capacitors marked Tant are tantalum - 22Jan03: corrected polarity of tantalum cap in “compressor” section Note polarity! Drawing copyright 2003 R.G. Keen. All rights reserved. C B AA B C Peculiarities 1. Module A circuit looks like a compressor but isnt. The loop gain is so high that the gain r

5、eduction 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

6、 least the 110K of the first stage, and also the 470K of the Q3 stage. + 收音机爱好者资料库 Ra d i o Fa n s .CN + - + - + - + - +9V +9V +9V +9V Source PP3 Vdc Input Jack C1 0.033 R1 220K R2 220K Rfba 470K Rfbb 100K Rfbc 100K C2 - 1uF + Q1 2SK30A C3 220nF Tant + R3 470K C5 0.01uF C4 680nF Tant + R5 2.2K R4 22

7、K D1 1N4148 R7 220K SDS Level B50K R8 1K SDS/ Normal Switch Norm SDS R6 100K R9 47K + C6 1uF + C7 1uF D2 1N4148 D3 1N4148 R26 22K R23 12K C18 0.01 R20 470K R19 470K R21 2.2K C17 0.056 C16 0.01 Balance B50K Effect Normal R22 100K Harmonic Mover Normal Output Jack C11 0.056 R16 22K C12 0.022 C13 0.022

8、 R18 6.8K Q2 2SC828 +9V +9V R14 220K R12 220K R15 22K R13 220K C10 0.01 + C14 1uF R17 22K + C8 1uF R10 47K R11 1.2K + C19 47uF R24 220K R25 47K Mode Sw C9 1uF + Updated Roland AG-5 Funny Cat - Redrawn based on moosapotamuss tracing and schematic - IC opamps used instead of modules - Opamp follower u

9、sed instead of 2SC1000 - Capacitors with + polarity indication are polarized - Capacitors marked Tant are tantalum Note polarity! Drawing copyright 2003 R.G. Keen. All rights reserved. C B AA B C 100R Added to help ensure stability for opamp U1A U2A U2B U1B 1 1 2 2 3 3 8 8 4 4 5 5 6 6 7 7 + C15 100u

10、F 16V 收音机爱好者资料库 Ra d i o Fa n s .CN + - + - + - + - +9V +9V +9V +9V Source PP3 Vdc Input Jack C1 0.033 C15 100uF 16V R1 220K R2 220K R28 1M Rfba 470K Rfbb 100K Rfbc 100K C2 - 1uF + Q1 2SK30A C3 220nF Tant + R3 470K C5 0.01uF C4 680nF Tant + R5 2.2K R4 22K D1 1N4148 R7 220K SDS Level B50K R8 1K SDS/

11、Normal Switch Norm SDS R6 100K R9 47K + C6 1uF + C7 1uF D2 1N4148 D3 1N4148 R26 22K R23 12K C18 0.01 R20 470K R19 470K R21 2.2K C17 0.056 C16 0.01 Balance B50K Effect Normal R22 100K Harmonic Mover Switch Normal Output Jack C11 0.056 R16 22K C12 0.022 C13 0.022 R18 6.8K Q2 2SC828 +9V +9V R14 220K R1

12、2 220K R15 22K R13 220K C10 0.01 + C14 1uF R17 22K + C8 1uF R10 47K R11 1.2K + C19 47uF R24 220K R25 47K Mode Sw C9 1uF + Mondo Updated Roland AG-5 Funny Cat - Modified for LED status indicators - Includes true bypass for entire pedal Note polarity! Drawing copyright 2003 R.G. Keen. All rights reser

13、ved. C B AA B C 100R Added to help ensure stability for opamp U1A U2A U2B U1B 1 1 2 2 3 3 8 8 4 4 5 5 6 6 7 7 + To Millenium Bypass for “Harmonic Mover” LED To Millenium Bypass for entire effect LED 收音机爱好者资料库 Ra d i o Fa n s .CN Copyright 2003 R.G. Keen. All rights reserved. No permission for displa

14、y from web sites without written permission. SDS Level Balance B50K B50K SDS Norm Norm Batt Input Output Silly Feline PCB layout and wiring 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 t

15、he 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. In making the PCB, all holes except off-boa

16、rd 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

17、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

18、 correct footprint. On the board layout, C6 and R9 are reversed in order from the schematic. This has no effect on the units operation. R1220K R2220K R3470K R422K R52.2K R6100K R7220K R81K R947K R10 47K R11 1.2K R12 220K R13 220K R14 220K R15 22K R16 22K R17 22K R18 6.8K R19 470K R20 470K R212.2K R2

19、2100K R2312K R24220K R2547K R2622K R27100 Rfba 470K Rfbb 100K Rfbc 100K R281M C1 0.033 C2 C3 0.22tant C4 0.68 tant C5 0.01 C6 C7 C8 C9 1uF 1uF 1uF 1uF 1uF C10 0.01 C11 0.056 C12 0.022 C13 0.022 C14 C15 100uF16V C16 0.01 C17 0.056 C18 0.01 C19 47uF 16V SDS Level - 50K log Balance - 50K log All diodes

20、 1N4148 U1, 2 = dual opamp Q12SK30A Q2A 2SC828 Q2B 2N3904 Sw1 = 4P3T rotary Mouser # 1uF 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. Full size toner transfer pattern