[sdiy] CA3086 and CA3046?

[Christian]

On Thu, 16 Aug 2001 12:37:53 -0700, you wrote:

>> Another question. Anyone doing anything fancy with Pin 13 (substrate)?
>> I am currently tying all spare transistor bases and emitters to ground
>> (which includes that pin).

>    Pin 13 MUST go to the lowest DC potential that any of the pins on the CA3046
>will see.  The transistors are isolated with basically a reversed biased diode
>junction.  You also have to remember that the breakdown voltage of this part is
>only 20 volts, so choose wisely, although, I have stretched this and have run
>them at 27.5 volts.  What I really need to do myself is set up a little rig to
>test the breakdown voltage....

The lowest DC potential in my circuit is the -15V supply rail. I am
unsure if the transistor pair I am using will ever see this, but I
might as well tie the substrate line to that rail just in case. Yes?

Many thanks for your help BTW.

Christian.