noise of arrays

Don Tillman don at
Tue Jan 23 18:51:21 CET 1996

   Date: Mon, 22 Jan 1996 10:57:38 +0200 (EET)
   From: Joachim Verghese <jocke at>

   On Fri, 19 Jan 1996, Haible_Juergen#Tel2743 wrote:

   > Does anybody know how noisy cheap transistor arrays (CA3046)
   > are, compared with cheap low noise transistors (BC550)?

   I built a phaser based on the ARP ladder in 1988. I did try
   substituting the 3086s for BC109s, but for some reason it didn't
   work very well. I'm not sure, but I probably used BC109Cs, which
   have a much higher beta than the 3086. 

Did you match the transistors?  I can imagine that the sound of this
circuit might be suboptimal if the transistor pairs weren't matched.

A big question is how much quieter is the circuit with 14 MAT-02's or
LM394's?  If it was significantly quieter you could get rid of the
compander, which I'm guessing would be a big win.

  -- Don

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