More on Envelope Generators....

Don Tillman don at
Thu Nov 23 05:26:22 CET 1995

   Date: Wed, 22 Nov 1995 13:54:22 -0700 (PDT)
   From: gstopp at

   A couple more details about my relay-based envelope generators:

   1. Drive the relay coil with an NPN in grounded-emitter configuration,
   or with an open-collector TTL gate, for guaranteed pull-in.

Can you say "inductive kickback"?...

   Do not use 74HCT at 15 volts. I did this, a severly exothermic 
   reaction results. 

...I knew you could.

[A reference to that National Lampoon Mister Rogers skit.]

  -- Don

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