Hi MIKE.

11-Mar-04 22:04:08, MIKE ROSS wrote to Jasen Betts


 MR> "Jasen Betts" bravely wrote to "MIKE ROSS" (10
Mar 04  07:00:38)
 MR> --- on the heady topic of "{at}%^{at}#$%^ veroboard"

 MR> Okay, so that's where the megohm stuff was used. More likely to
 MR> see megohm values on FET type input biasing, used to be on vacuum
 MR> tubes.

  the final circuit was something like this.
           ___________________________________________________________ +12
           |          |      |       |                |           |
          ???        10k    _L_     _L_100n   ,-[1M]--)----.      |
           |          |     /^\     ~T~       |  R7   |    |  .---|---.
           |     _____|  || ~T~ . .  |        |     |/     |  \  _L_  |
           |  |/'     |--||--+--|<|--+-[100K]-+-----|~ Q3  `-|/  /^\  RL
    ,-[1M]-|--|      /   ||     ` `     R6          |\        \  ~T~  |
    |      |  |\| |/'    1n                           |        `--|---'
   _L_     |   ~`-|  Q1,2                             |          /'
   ~T~     |      |\|                                 |       |/'
    |10p   |       ~`\                                |-[10K]-|   Q4
    |      |          |~~~~|                         10K      |\|
   _|     2M2        3K1  _L_1u                       |        ~`\,
   video   |          |   ~T~                         |           |
   input   |          |    |                          |           |
   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 0V

before I had built anything left of R6, or fitted R7 I was finding that
even connecting  the left end of r6 to +12 would not turn Q4 off.
it was then that I measured 400k between the Q3 base and collector tracks

 -=> Bye <=-

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