DOD FX75 Flanger Guitar Effect Pedal

Thu, 14 Jul 2011 16:22:09 +0000

DOD FX75 Flanger Guitar Effect Pedal circuit diagram

Technical info:

– Specifications (1984): Input impedance = 500 k Ohms, Output impedance = 1 k Ohms; Gain = 0 dB; Delay Time = 0.5-6 ms; Signal-to-noise ratio = 90 dB
– Specifications (1986): same as above, plus Maximum Input Level = 4 V P-P, Bandwidth = 40 Hz-16 kHz (dry), 90 Hz-12 kHz (delay); Sweep Speed = 0.1-8 Hz
– Official schematic provided with pedal by DOD (dated 10/14/1984)
– Notable IC chips: MN3007 BBD chip driven by a MN3101 clock generator/driver CMOS chip; three TL022CP op amps (early versions) or one TL022CP and two 1458-type op amps (later versions)
– Internal trim pots: three; however, we do not recommend messing with trim pots

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This is the circuit diagram of DOD FX75 Flanger guitar effect pedal. The circuit drawn by Fabian P. Hartery.

Featuring a Width control and two output jacks, the FX75 was much more versatile than its predecessor, but the flanging effect it could provide was still not very intense. That said, chorus-like washes of flange can be easily dialed in, and the FX75 can sound quite musical.

Controls: Speed, Width, Regen

Components description:

CD4007 dual complementary pair with inverter; (RCA)
TL022C low power dual operating amplifier; (texas instruments)
MN3007 audio signal delay, 1024 stage low noise BBD (5.12-51.2 msec delay)
MN3101 clock generator for Bucket Brigade Device/BBD
MN3101/MN3007 manfufactured by Panasonic; these are equivalent To ECG1639/ECG1641 respectfully

Official schematic provided with pedal by DOD (dated 10/14/1984):

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Download the schematic diagram of? DOD FX75 Flanger guitar effect pedal circuit in PDF document:

FX75 Stereo Flanger Scheme

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MN3101 circuit | Electronic Schematic Diagram

DOD FX75 Flanger Guitar Effect Pedal

FX75 Stereo Flanger Scheme