On Mon, 06 Aug 2007 20:11:14 GMT, Joerg
wrote:

Jonathan Kirwan wrote:

On Mon, 06 Aug 2007 19:35:40 GMT, Joerg
wrote:


Jim Thompson wrote:


Joerg, Why don't you try the attached version?


Ok, just did: It chokes, creating humongous bursts of spikes on VCC.
There is no longer a normal oscillation :-(


Can you try it more like this?

||
,---/\/\----+---||------,
| 1M | || 10n |
| | |
| \ |
| / 1M |
| \ |
| | |
| |\ | |\ |
+---| o----+----| o---'
| |/ |/
|
---
--- 10p
|
gnd


Thanks, Jon, done that before and it did not help the cross current at all.

Make the left-most 1M into 10K.

Where's the 10pF coming from?

Or, naughty question of the week, Why are you using 4000 series CMOS
in the 21st Century ?:-)

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice480)460-2350 | |
| E-mail Address at Website Fax480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

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