[RE: [Pulse wave with no DC]/4066]

[Harry Bissell]

Harry (being more specific) Here's a .gif schematic of the "dirty trick"
Funny, when I looked up the schematic, i thought it said -6 volts. (add +15
and -6 and that's death to cmos...) The schematic is so old, the decimal point
has faded almost to oblivion. So when I redrew it, I called it -600mV. This
should last another decade. Any Questions??? harrybissell at netscape.net


John Speth <johns at oei.com> wrote:
Harry, could you please be more specific in your reply (maybe ASCIImatic)?

I think I know what you mean here but when I try to interpret what you 
wrote, I see some limitations and/or pitfalls so I'm hoping you can clear 
this up.  Is there a P5 schematic on the web somewhere that will show me 
this?

John Speth
Object Engineering, Inc
mailto:johns at oei.com

On Tuesday, April 13, 1999 9:30 AM, Harry Bissell 
[SMTP:harrybissell at netscape.net] wrote:
> Sure, you can use 4051/4066 if you locate them at the summing junction of 
an
> op-amp (after the input resistors), and bias the Ground pin at -0.7V. If 
the
> switch is on, the voltage across the switch is set by the ratio of the on
> resistance and the input resistor, and if it is off the input resistor 
limits
> the current to the input pin (diodes conduct) who cares.
> The Prophet V did it this way.



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