Menic -10V

[Petr Simek]

On Thu, 24 Aug 2000, Jindrich Vidensky wrote:

> Toto zapojenie som kdesi vyhrabal, nemam odskusane.
> Treba to samozrejme pozriet s neproporcionalnym fontom.

To ale vyrabi zaporne napeti o neco mensi velikosti nez je napajeci - tedy
pri Ucc +5V z toho vylezou asi -4V . Pro jeste nizsi napeti by na to musel
navazat dalsi stupne.

> Jindrich Vidensky
> 
>           +V 
>            ^ 
>            | 
>    +-------+---+ 
>    |       |   |                  -V Output 
>   R1       |8  |4        +----+---> 
>    |    7 -------        |    |            Parts List: 
>    +-----|       |      D2    |            IC1 = 555 
>    |  +--|       |  +    |    |             R1 = 1.5K 
>   R2  | 6|  IC1  |---C1--+    |             R2 = 10K 
>    |  |  |       |3      |    |             C1 = 150uF,16V         (10 uF) 
>    +--+--|       |      D1   C2             C2 = 1uF,16V           (22 uF) 
>    |    2|       |       |    |+            C3 = 3300pF            (1500pF) 
>    |      -------        |    |             D1,D2 = 1N4154 diodes  (1N4001) 
>   C3         |1          |    | 
>    |         |           |    | 
>    +---------+-----------+----+            * green parts were changed from the original (that are HERE) 
>                                             for my configuration 
>              | 
>             === 
>            (GND) 


*------------------------------------------------------------------------*
|                          Petr Simek   APS JU                           |
|                             petrsi@jcu.cz                              |
*------------------------------------------------------------------------*