FX25 Envelope Filter

Two 'original series' cosmetic variants of the FX25, from 1984 (left) and 1988

The FX25 Envelope Filter was derived from DOD's well-received 440 Envelope Filter. Like the 440, the FX25 uses a bandpass filter circuit where the peak frequency is determined by the input signal level, for a touch-controlled wah or auto-wah effect. The FX25 was one of the original ten DOD FX-series pedals that debuted in 1982, and remained in production until it was replaced by the FX25B in 1998.

• Controls: Range, Sensitivity
  
  
• Notable IC chip: RCA CA3094E OTA (1984); circuit was revised by 1988
  
  
• List price (Jan. 1983): $69.95
  
  
• FX heritage: FX25 FX25B
  
  
• External links:
  • @ discofreq's FX site
  • @ harmony-central.com
  • @ noiseguide.com
  
  

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