RDL FP-CH8 Chime Generator - 8 Electronic Chimes

The FP-CH8 is an electronic chime generator that produces eight different synthesized chimes. Each chime can consist of up to 3 tones and 3 harmonics selected to produce sonically natural effects. Certain chimes are single tones and some are a sequence. Each of the 8 chimes is triggered by an individual external closure to ground. A momentary closure to ground is required to start a chime. A single additional CONT (continuous) terminal is also provided. Each chime plays once unless the CONT terminal is grounded. The continuous function causes a chime strike or sequence to repeat until the CONT terminal is ungrounded. This function causes tone chimes (Chimes 4 and 8) to be extended in duration until the CONT terminal is released. Background music or paging audio may be connected to the MUSIC IN input. When a chime plays, the music source will be quickly faded to a level set on the front-panel DUCKING trimmer. The ducking fade depth may be adjusted from 0 dB to fully off, allowing chimes to be mixed with the music or to interrupt the music. The front-panel CHIMING indicator illuminates while music is ducked and a chime is playing. WAIT and IGNORE terminals are provided to prevent or delay chiming action.

Chime patterns are: single strike, double strike, triple strike, tone ring, manual strike, descending triple strike, eurosiren and multi-tone alert.


  • 8 Individually Selectable Electronic Chimes
  • Selectable Single or Repeated Chime
  • Synthesized Bell Harmonics for Natural Sound
  • External Chime Actuation
  • Input for Background Music or Paging Audio
  • Automatic Ducking

Music Input:

50 kΩ balanced or unbal, +22 dBu max.

Frequency Response:

20 Hz to 50 kHz (± 0.5 dB)


< 0.05% (unity gain, 50 Hz to 20 kHz)

Noise below +4 dBu:

< -70 dB (unity gain)


> 16 dB (above +4 dBu)


Unity to +22 dB (adjustable)

Ducking Fade Depth:

0 dB to fully off (adjustable)


150 Ω balanced, + 4 dBu or 75 Ω unbal.

Trigger Inputs (8):

Trigger on high to low transition, 0.5 mA

Control Inputs (3):

WAIT (play delay), IGNORE (no playback), CONT (continuous repeat)

Control Outputs (2):

CHIMING (Open-collector low @ 25 mA),
EOC (low 100 mS at end of chime)

Ambient Operating Environment:

0° C to 55° C

Power Requirement:



Height: 1.36 in. 3.46 cm; Width: 3.25 in. 8.26 cm; Length: 5.0 in. 12.7 cm