Analog Multi-FX
Analog Multi-Fx System
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210042_original.jpg
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210307_original.jpg
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210300_original.jpg
Here is an analog multi-effects. It contains following effects:
BOSS CS-2 Compression Sustainer
YAMAHA OC-01 Octaver
BOSS SD-1 Super Overdrive
BOSS DS-1 Distortion
MAXON, CS-505 Stereo Chorus
BOSS BF-2 Flanger
BOSS NF-1 Noise Gate
BIAS Analog Delay
Several months ago, I obtained a junk rack effector with a PSU, a programmable FX switcher and 7 FX-PCBs. They all were alive. I took 7-PCBs and added BIAS Analog Delay, then, polished, refined, and modified them and gathered into a 2U sized box.
Since the original PSU was not capable enough, I re-designed the dual PSU. This PSU is designed under AC100V/50Hz system. Be careful to refer it. The bottom of the schematic is a 7809-based voltage regulator which is applied to the compressor, the octaver and the distortions. On the other hand, the top of the schematic, a discrete voltage regulator is employed. This is for the flanger, the noise gate and the delay. The MAXON Stereo Chorus has a local voltage regulator, which is directly connected to the rectifier output of the PSU. Bi-stable multi-vibrator circuits, so-called the Flip-Flop are employed to toggle the FX on/off. I modified the circuits to bypass the Flip-Flops. The Flip-Flop is not suitable for micro processor FX control because of the power-on reset problem. Modification details are followings; FX Switcher1 for BOSS CS-2, SD-1, DS-1, NF-1 ; FX Switcher2 with the mechanical relay for YAMAHA OC-01 ; FX Switcher3 for MAXON CS-505 ; FX Switcher4 for BIAS Analog Delay. To Switch the FXs, simplly 8 alternate (latched) switches, like BOSS FS-5L are needed.
The Analog Multi-Effector has the compressor, the octaver, the overdrive, the distortion, the chorus, the flanger, the noise gate and the analog delay. It is indeed a concrete system to use. For programmable FX switching, a micro processor controlled gadget is required, which is under developing.
April, 18, 2004
Before the restoration
http://cdn-ak.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017205926.jpg
Related schematics
PSU
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210349_original.gif
FX Switcher1
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210251_original.gif
FX Switcher2
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210243_original.gif
FX Switcher3
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210236_original.gif
FX Switcher4
https://cdn-ak2.f.st-hatena.com/images/fotolife/C/Chuck/20171017/20171017210403_original.gif
製作メモ (兼 更新日記)
(2017/10/17) Scrapbox移動