Active Filter Unit

Sinclair Radionics Ltd.; St. Ives (Cambridge)

Data
Forum
Pictures
Collections

  • Year
  • 1970
  • Category
  • Audio Amplifier or -mixer
  • Radiomuseum.org ID
  • 336912

Click on the schematic thumbnail to request the schematic as a free document.

 Technical Specifications

  • Number of Transistors
  • 4
  • Main principle
  • Audio-Amplification
  • Wave bands
  • - without
  • Power type and voltage
  • Powered by external power supply or a main unit.
  • Loudspeaker
  • - For headphones or amp.
  • Material
  • Printed Circuit Board
  • from Radiomuseum.org
  • Model: Active Filter Unit - Sinclair Radionics Ltd.; St.
  • Shape
  • Chassis only or for «building in»
  • Dimensions (WHD)
  • 8.5 x 1.5 x 4 inch / 216 x 38 x 102 mm
  • Notes

  • The Active Filter Unit is part of the Sinclair Project 60 range launched in 1970.

    For use between Stereo 60 unit and two Z30s or Z50s and is easily mounted. It is unique in that the cut-off frequencies are continuously variable, and as attenuation in the rejected band is rapid (1 2dB/octave), there is less loss of the wanted signal than has previously been possible. Amplitude and phase distortion are negligible. The unit is suitable for use with any other amplifier system.
    Two stages of filtering are incorporated - rumble (high pass) and scratch (low pass).

    SPECIFICATIONS: 

    Voltage gain at 1 kHz (Filters 0): 0.98 (-0.2 dB)
    Frequency response (Filters 0) : -3 dB @ 25 Hz and 28 kHz
      -1 dB @ 35 Hz and 20 kHz
    Distortion at 1 kHz & 250 mV rms out : 0.02 % with 35 V supply
    HF cutoff -3 dB: Variable between 28 kHz & 5 kHz
    LF cutoff -3 dB: Variable between 25 Hz & 100 Hz
    Slope: -12 dB per octave
    Supply voltage: 15 to 35 VDC

     

  • Price in first year of sale
  • 5.97 GB £
  • Mentioned in
  • -- Original prospect or advert (Practical Wireless April 1971 Page 93)
  • Literature/Schematics (1)
  • - - Manufacturers Literature (Sinclair Project 60 Stereo FM Tuner Instructions)
  • Author
  • Model page created by Gary Cowans. See "Data change" for further contributors.

 Collections | Museums | Literature

 Forum