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Rivera Buf V
The circuit of the E945 is very simple
with a single op-amp taking care of the buffing and boosting duties,
while the loop is post-buffer/booster. The pedal works really well and
the amount of ultra-clean boost is quite staggering with an internal
symmetrical supply of +/-12 volts. This E945 is ideal with a twin
channel Blackface/Silverface amp or with a two amp setup giving a pseudo
4 channel rig with one simple pedal.
BOSS NF-1 Noise Gate
- IC1: uPC741C (operational amplifier IC)
- D1: RD11EB (11V Zener diode)
- D3, D3: RD4.7EB (4.7V Zener diode)
- D4-D8: 1S1588 or 1S2473 (switching diodes)
- Q1, Q2: 2SC732TM-GR (NPN silicon transistors)
- Q3: 2SK30A-Y (N-channel JFET transistors)
- Q4-Q9: 2SC1815-Y (NPN silicon transistors)
Adjustment procedure:
1) Set the Sens knob fully counterclockwise and the Decay knob fully clockwise.
2) Connect an oscilloscope to the effect's output through a millivoltmeter. Feed a 1kHz -45dBm sine signal to input.
3) Adjust VR3 and VR4 for the values shown in Fig.3.
1) Set the Sens knob fully counterclockwise and the Decay knob fully clockwise.
2) Connect an oscilloscope to the effect's output through a millivoltmeter. Feed a 1kHz -45dBm sine signal to input.
3) Adjust VR3 and VR4 for the values shown in Fig.3.
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